As one of the leading valve suppliers in China, STV has a wide range of products to cater to various industrial needs. Our inventory includes many different variations of valves, from Ball Valve, Globe Valve, Gate Valve, to Check Valve and Y-Strainer. We value the uniqueness of every project and we are able to custom-make special industrial valve to order.

2021年8月24日星期二

Ball Valves vs Globe Valves,Which Valve is Best for You?

 There are many different types of valves available for different applications. With so much choice it can be difficult to decide which valve is most suitable for your application. In this article, STV Supplies explores the merits of ball valves versus globe valves.



WHAT IS THE MAIN DIFFERENCE BETWEEN BALL AND GLOBE VALVES?

The main difference between ball and globe valves is the way they close. Ball valves have a stem and ball, which turns horizontally, and are commonly referred to as “rotational” valves. Whereas, globe valves have a stem and plug, which strokes linearly, and gives them their other name of “stroke” valves. Ball valves are best suited to applications requiring on/off control without pressure drop. While globe valves excel at regulating flow.

HOW DOES A BALL VALVE WORK?

Ball valves are designed with a ball inside the valve. A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball (called a “floating ball”) to control flow through it. It is open when the ball’s hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle. The handle lies flat in alignment with the flow when open, and is perpendicular to it when closed, making for easy visual confirmation of the valve’s status.

HOW DOES A GLOBE VALVE WORK?

Globe valves were for many years the industry standard in control valves. They are named for their spherical body shape, with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug (or disc) can be screwed in to close the valve. Typically, automated globe valves use smooth stems rather than threaded and are opened and closed by an actuator assembly.

WHICH IS BETTER: A BALL VALVE OR GLOBE VALVE?

Ball valves are durable, performing well after many cycles, and reliable, closing securely even after long periods of disuse. These qualities make them an excellent choice for shutoff applications, where they are often preferred to gates and globe valves. On the flip side, ball valves do lack the fine control in throttling applications offered by globe valves.

STV SUPPLIES STOCKS BALL AND GLOBE VALVES

STV stock a wide range of ball valves, from quarter-inch to six-inch at our works in Bishopbriggs. From general purpose two-piece ball valves, v-ball control valves, hygienic valves, to heavy duty ball valves for steam; we have a variety of sizes, end connections and materials to suit many applications. We also stock globe valves up to six-inch in size, and can supply many size and material variants on a next-day basis.

2021年8月20日星期五

A reliable source for Ball Valve information and leading China Ball Valve Companies & Manufacturers.

 Ball Valves

A valve is a device that controls, regulates, or directs the flow of a fluid, by closing, opening, or partially obstructing one or more passageways. Ball valves are a type of quarter turn valve that controls flow. They serve as more effective alternatives to similar valves, like butterfly valves and gate valves. 

Note that ball valves are not the same thing as “ball check valves.” While the two have similar names, ball check valves are designed differently and serve a different purpose.

Applications

The goal of ball valves is to regulate fluid flow. They can do so in a number of ways. They can regulate some types of low flow valves, provide backflow prevention for valves with a swing check component, isolate systems, and provide gear operators with complete shut-off capabilities.

Because they are available with either manual or motorized controls, ball valves can provide their services to applications in a wide variety of settings.

Mostly, ball valves are used for on and off service of pipes containing suspended solids, slurries, liquids, or gases. Other applications that commonly employ ball valves include tubing systems, equipment, and tools in virtually every industry that transports fluids. You can find them anywhere from the factory floor to faucet at home. Industries that make use of ball valves include manufacturing, mining, oil and gas, agriculture, heating and cooling, plumbing industrial and domestic, water, consumer goods, construction and more.

History

The earliest example of something similar to the ball-type valve was the valve patented in 1871 by John Warren. His was a metal-seated valve that featured brass balls and brass seats. Warren ended up handing over the patent for his brass ball valve design to John Chapman, the head of Chapman Valves. For whatever reason, Chapman never put Warren’s design into production. Instead, he and other valve manufacturers used older designs for many years to follow.

The ball valve, also known as the spherical plug valve, finally came into play during World War II. During this time, engineers developed it for use in military aircraft fuel systems. After their success with ball valves in World War II, engineers adapted ball valves for industrial applications.

One of the most important ball valve-related breakthroughs of the 1950s was the development of Teflon and its subsequent use as a ball valve material. After the development of Teflon, a number of companies, such as DuPont, fought for the rights to its use, as they knew it would bring great market revenue. Eventually, more than one company were able to make Teflon valves. Teflon ball valves are flexible and can create a positive seal in two directions. In other words, they are bidirectional. They are also leak-proof. The first manufacturer to design ball valves with flexible Teflon seats was Howard Freeman, who patented his design in 1958.

Today, ball valves have evolved in a number of ways, including their material compatibilities and possible applications. In addition, they are able to use CNC machining and computer programming like the Button Model to make the best valves possible. Soon, ball valve manufacturers will be able to offer their products with even more options, including aluminum construction, less wear, and the widespread capability of throttling, which allows operators to pass variable amounts of fluid through a valve at a restricted flow.

Design

Materials
Ball valves may be made from materials including bronze, brass, titanium, ductile iron, cast iron, carbon steel, stainless steel, chrome, Teflon, PVC, and other plastics. Every material offers something different. For example, stainless steel ball valves are sure to be corrosion resistant and have a high tensile strength. PVC ball valves, on the other hand, gain all the positive qualities of this polymer, such as light weight and water, chemical, and concentrated acid resistant.

Considerations and Customization
When designing your ball valve, based on your application specifications, manufacturers decide on a number of design factors, such as ball material, valve body material, lining material, the ball valve dimensions, and the ball valve type. Details like this will determine how your ball valve reacts to environmental stressors like pressure, high and low temperatures (ball valves usually operate at room temperature), liquid flow, gas flow, vibration, impact, etc.

Ball valves are also available in a wide variety of custom sizes, from fractions of an inch, like miniature ball valves, to multiple yards in diameter. The smallest ball valves can control the flow of confined or hard-to-reach spaces. To find out about a manufacturer’s custom options, have a chat with a member of their sales staff.

Features

Ball valves feature a ball body, a ball, a port, seats, a stem, packing, a bonnet, and an actuator.

The body is a pressure vessel. It holds the flow control components, such as the ball. It is also the means by which operators can connect multiple pieces of tubing or pipe.

The ball is hollow, pivoting, and perforated.

The port is a hole that is bored through the middle of the valve.

Seats are round disks used to create a seal between the body and the ball.

The stem is a shaft. It helps the ball rotate by connecting it to the outside of the valve.

Packing consists of a number of flexible seals that are packed in around the shaft so that the valve does not leak.

The bonnet is a section of the body that contains the packing and the stem.

The actuator, sometimes called the operator, is a device such as a lever handle. The valve and actuator work together to rotate the valve stem. When the handle lies flat in alignment, the valve is open and when the handle sits at a perpendicular position, the valve is closed.

Types

Ball valves are chosen for an application based on their qualities. First, customers must choose between two primary design options: trunnion and floating ball.

Trunnion ball valves use additional mechanisms to anchor the ball to a certain spot, where they serve larger and higher-pressure valve applications. They are costlier than floating ball valves.

Floating ball valves, or float ball valves, use a non-anchored ball that drifts into place or floats slightly downstream into the seat, providing a tight seal.

Another consideration customers may take into account is whether the valve is motorized, actuated, or manual.

Motorized ball valves, per their name, use a motor to open and close itself.

Actuated ball valves operate with the help of an actuator that, while sitting on top of the valve, supplies force and motion. Using an actuator, the valve may be controlled either automatically or manually via a remote. The handle of trunnion ball valves, which rotates the ball at a one-quarter turn, may be any three of these.

Customers may also choose between a few other types of ball valves, such as flanged ball valves, multiport ball valves, non-return ball valves, and high-pressure ball valves.

Flanged ball valves feature outside edges that are raised into a flange, with holes placed in alignment with the piping system in which the valve will be placed. Flanged ball valves are valued for their simplicity and the ease with which they can be installed or removed from a piping system.

Multiport ball valves, such as 3-way and 4-way ball valves, have multiple ports through which flow passes. The way that the flow comes in an inlet and exits one or more outlets is controlled by both the handle rotation and the shape of the inlet port.

Three-way ball valves usually have T or L shaped ports.

Four-way ball valves usually have two L shaped ports.

Non-return valves, also called ball check valves, only direct fluid flow in one direction, though they do allow for both low and high pressure and temperature flows.

High pressure ball valves are those ball valves that are able to control both high and low flow applications with high temperature and pressure ratings, up to around 7500 psi.

Globe valves are an advanced type of ball valve designed to regulate flow. Often, manufacturers install them in automobiles, where they act as transmission control valves. They are named after their shape. They are disc-like and look like valve globes.

Advantages

Ball valves are popular for a number of reasons. First, they are popular for the fact that they have a variety of material options. Second, ball valves are popular for the fact that they are easy to clean. Ball valves are largely self-cleaning because, as the ball of a ball valve rotates, the seat wipes itself, effectively preventing any buildup. In addition, because they have no internal components, they require little maintenance and they do not retain internal debris. Instead, they are highly controlled and they are blowout proof. Likewise, they are easy to monitor. Next, ball valves are very diverse and customers can use them for a wide range of applications. Finally, ball valves are cost-effective and reliable.

Accessories

Examples of common ball valve accessories include repair kits, stem extension devices, and extra connections for the valves and fittings (socket welds, double ferrules, etc.).

Before purchasing any accessories or spare parts, make sure to check with your supplier. If you purchase accessories from a source other than your supplier, you may inadvertently void your warranty.

Proper Care

To keep your ball valves running smoothly, you may need to clean their interior from time to time. Because the ball has a hole in it, it is possible for it to become plugged. If exposed to the elements or high heat, it may also become corroded. To keep on top of this, set up a schedule for regularly checking on and cleaning your valves.

Standards

Depending on your application, industry and location, you may have different standard ball valve requirements. These requirements include manufacturer standards, test inspection standards, and design standards. To learn the design standards and testing standards to which your ball valves may be beholden, speak with a leading industry association.

Things to Consider

Find the right manufacturer for you by knowing what you need and communicating it. We recommend that, before you start looking at manufacturer profiles and websites, you take some time to jot down your specifications, questions, and concerns. That way, you can focus while you browse, and you will be ready for a productive conversation when it’s time to talk to a potential supplier. Your list should include not only your application specifications, but also things like your standard requirements, your budget, your deadline, your delivery preferences, and your preferred post-delivery services.

Once you have put your list together, check out the various high-quality ball valve manufacturers we have listed on this page. You will find company information placed in between these informational paragraphs. As you browse, remember to frequently consult your specifications list. Pick out three or four industrial valve manufacturers in whom you are most interested, then reach out to each of them to chat. Go over your application in detail and don’t be afraid to ask a lot of questions. When you’re done, compare and contrast the services that each manufacturer offers. Based on your needs, pick the right one for you and get started.

2021年8月19日星期四

The experience of Check Valve Installation

 Check valves play a critical role in preventing backflow and protecting sensitive equipment, pipes, pumps, and compressors. However, check valves can’t function at their best if they aren’t installed properly. Mistakes in installation can manifest in valve leakage or failure, compromising the integrity of the entire piping system. 

Check-Valve-Installation

Swing check valves, double-door check valve, or silent spring-assisted axial flow check valves, all control flow through a slightly different mechanism. Swing valves use a disc that swings in and out of the fluid stream while double-door valves use springs to close two “doors” to stop the flow. Spring-assisted axial flow valves use a disc and stem design and incorporate compression springs to close the valve before the fluid flow has reversed its flow direction. This is important because the quick closing nature of the axial flow design drastically reduces the possibility for water hammer—a dangerous malfunction where sudden pump shut down or an abruptly closing valve produces a hydraulic shock wave in the piping. In this guide, we’ll discuss ways to prevent water hammer and other common check valve problems. 

When a Check Valve Is Necessary

when-a-check-valve-is-necessory-2

Industry insiders call check valves the “misunderstood valves.” Many professionals simply don’t know when or how to use check valves appropriately, so they think that the entire category is unnecessary or ineffective.

So when is a check valve necessary? Typically, we recommend a check valve when there is the potential for the media being transported in the pipe to backflow, which can damage the system. Condensate pooling can also lead to water hammer. Installing check valves in condensate recovery lines prevents serious malfunction by automatically preventing backflow. In this way, the right check valve not only prevents serious problems like water hammer but also safeguards the entire process as well as the equipment installed in the piping.

Check Valve Installation

Check-Valve-Installation-3

To experience the full benefits of a check valve, it’s critical to adhere to installation best practices. A simple mistake in fitting the valve can reduce efficiency at best or cause substantial damage at worst. Some key points to keep in mind include:

  • Selection: Choosing the wrong valve for your piping’s size, material, pipe orientation, flow direction and flow rate will result in process inefficiencies or possible premature wear and valve component failure.
  • Positioning: Pay close attention to where in the piping you install the valve. Not all check valves will work in a vertical piping run.  It also includes ensuring that the valve is at least five pipe diameters away from elbows, tees, fittings or other valves which can cause turbulence
  • Orientation: Ensure that the valve is oriented properly by checking the flow arrow (often printed on a tag or permanently marked the valve itself). This arrow indicates the proper positioning relative to the pipe’s flow. 

Solutions to Your Check Valve Problems

Solution-to-your-check-valve-Problems-5

Preventing check valve malfunctions like hammer pipe is critical to avoiding serious, costly damage to your pipes, valves or other expensive equipment. At DFT, we never want our clients to experience preventable system failure, which is why we’re sharing our expertise: in addition to this guide, we’ve put together a comprehensive webinar that expands on proper check valve installation and maintenance, providing expert guidance on piping design that works and lasts.

For specific questions about check valve selection for your application, contact our team. Whether you’re looking for a standard stock valve or a completely custom order, we’ll work with you to make sure you receive a functional, effective, and safe solution to your piping challenges. 

Types of Check Valves: Which One is Right for You?

 Check valves prevent backflow in a piping system. Also known as non-return valves or NRV, these mechanisms ensure that the valve closes if the fluid flow passing through the pipe reverses. Ensuring unobstructed flow, a check valve can automatically close when pressure decreases. They are found in many industries with applications in mining, natural gas, and water.

Check valve purchases typically take into consideration line size, pressure class, working pressure, flow rate, and media gravity and temperature.

Some of the most common types of check valve include:

  • Ball
  • Double Door
  • Lift
  • Piston
  • Stop Check
  • Swing
  • Tilting Disc

Read more about the different varieties of check valve types below.

Ball Check Valves

The Ball Check Valve replaces the disk device often used to prevent flow with a ball that relies on gravity. Under pressure from the flow, the ball will lift up out of the pipe outlet. When low pressure lessens sufficiently, the ball falls back into place to stop the flow. The ball check valve is a type of lift valve.

Globe Valve

Globe valve
A globe valve

Image credit: Conval Inc.

These types of valves are used for regulating flow in a pipeline. Globe valves consist of a movable disk-type element, and also have a stationary ring seat in a globe-shaped body.

Dual Plate Check Valves

Also known as a butterfly valve, the double door or dual plate check valve features a disc divided in two along a center line. The two doors can hinge open to allow forward flow or arrest backflow. Compact and lightweight, this type of check valve is often implemented for low-pressure liquid and gas applications. 

Lift Check Valves

This type of valve is typical in applications requiring high-pressure service. Effective with a high-velocity flow, lift check valves can be installed either horizontally or vertically (in pipelines with an upward flow). Types of lift check valve include piston type and ball type. This type of valve can prove more leak resistant.

Piston Check Valves

The piston check valve is a type of lift valve. The valve is opened or closed by the pressure (or lack of pressure) passing through the pipe. Gravity forces the piston valve’s weight into the closed position if the flow reverses itself.

Stop Check Valves

Combining the advantages of lift check and globe valves, the stop check valve offers override control, regardless of flow direction. While some other types are dependent on gravity, the stop-check valve can be closed deliberately using an external mechanism. This provides flow control regardless of backflow or forward flow level. This type of valve helps prevent damage to equipment such as boilers or pumps.

Swing Check Valves

A prevalent check valve with its disc completely out of the way when the material is flowing. The disc swings back into place over the pipe when not in use. This means swing check valves close slowly. These valves are common in applications with a high solids percentage and lower on/off cycle count.

Tilting Disc Check Valves

A variation on the swing check valve, the tilting disc is spring-assisted to stay in the flow stream, with media flowing around it. Available in wafer or lug type design, this valve type has a disc which tilts up under steady pressure from the fluid flow. As the flow level lowers, the disc will revert to a closed position. The disc simply floats on the surface of the media when the forward flow is sufficient to overcome the spring tension.

Other Types of Check Valves

Check valves are also characterized by their application. Examples of these include wastewater, oilfield, marine, or beverage. Suppliers also characterize check valves by the material used in the valve body, such as titanium, plastic, and rubber.

Learn More

For more information on check valves, check valve installation, and related products, consult our other guides or visit us

What Types of Valves are Used in the Oil and Gas Industry?

 Valves are an essential part of any piping system in the oil and gas industry. Valves help regulate the flow of materials to and from machinery and equipment. This makes them integral in the many different kinds of functions and applications. Valves in the oil and gas industry have to work with liquids, gasses, viscous materials, and corrosive mediums. 

At any given time, a single factory may have a number of different kinds of valves installed, each performing a different function. Valves in oil and gas factories can be used to start and stop the flow. Some valves can also be used to regulate the flow according to the pressure and velocity requirements. This article features a list of common valves used in the oil and gas industry, along with their function, pros, and cons. 

What Types of Valves are Used in the Oil and Gas Industry?

There are a number of different processes that take place inside and oil and gas factory. Each of those processes requires different kinds of materials to be taken to and from machinery and equipment. This means a number of different kinds of valves are needed for a single process to be successfully completed. Here is a list of some of the most common valves used in the oil and gas industry.

#1. Ball Valves

Ball valves are quarter-turn valves that provide quick shut-off and turn-on operation. These valves feature a sphere or a ball with a hollow center. When the center aligns with the pipe, the valve is open and allows the flow of the medium. When the ball turns, the center is no longer aligned with the pipe and the flow stops. 

Floating Ball Valve

The stem and ball of these valves are usually made of some kind of metal while the seat is made of soft materials like Teflon. This combination of materials helps the ball valves work in temperatures as low as -200 degrees Centigrade and as high as 500 degrees Centigrade. Ball valves are very versatile and can be used to regulate the flow of liquids, gasses, and air. They are very famous in the industry because they provide a tight seal and a low torque. The only con of using ball valves is that they can only be used for shut-off applications, they cannot be used for throttling.

Common Ball Valves Used in Oil and Gas Industry

#2. Butterfly Valves

Butterfly valves are quarter-turn valves that are used to start, stop, and regulate the flow of medium through a pipeline. The valve features a large disk with a stem running through it. The stem divides the disk into two pieces that look like the wings of a butterfly. A 90-degree rotation of the butterfly valve handle is used to open or close the valve. 

Resilient Seated Butterfly Valve

Butterfly valves are used both for shut-off applications and medium flow regulation. They are used in larger pipelines and can cope with low-pressure drop and high-pressure recovery. These valves are normally used to isolate or regulate liquid mediums used in waterworks, process industries, and power generation.

Common Butterfly Valves Used in Oil and Gas Industry

#3. Check Valves

Check valves allow the medium to flow in only one direction and prevent backflow. These valves are used to protect the integrity of machines and to make sure different mediums do not mix with each other. They are also called non-return valves or NRVs. The pressure of the flow passing through the pipeline opens the valve. Once the medium has passed through the valve, any backflow is prevented as the pressure generated by the backflow closes the valve.

Check valves are usually installed around pumps and compressors where backflow can damage the machinery or cause an unnecessary shutdown of the equipment. They are normally used fully open or fully closed and for the regulation of steam, gas, and other fluid services. 

Common Check Valves Used in Oil and Gas Industry

  • Swing Check Valves
  • Piston Check Valves
  • Ball Check Valves
  • Tilting Disc Check Valves

#4. Globe Valves

Globe valves are linear motion valves that are used to start, stop, and regulate the flow of medium through pipelines. These valves can be used for isolation and throttling services. Globe valves feature a disk that is either completely removed from the flow path or it completely closes the flow path. This is the reason why they provide better shut-off than gate valves. 

Globe valves are used in fuel oil systems where the flow is regulated and leak prevention is important. They are also used in cooling water system, turbine lube oil systems, air extraction condenser, and condenser air systems.  

Common Globe Valves Used in Oil and Gas Industry

  • Stop Check Valves (SDNR)
  • Tee Pattern Globe Valve
  • Wye Pattern Globe Valve
  • Angle Pattern Globe Valve

#5. Gate Valves

Gate valves are bi-directional valves that are used to start or stop the flow of medium through a pipeline. These valves feature a gate that moves up and down to open and close the valve. Gate valves can be either fully open or fully closed. They are used to start and stop the flow but cannot be used for regulating or throttling applications.

Gate valves are commonly used to regulate the flow of water, oil, gas, steam, and other fluid services. They provide low-pressure drops and can work with high-pressure and high-temperature applications. The only con to using gate valves is that they are prone to corrosion and cannot be quickly opened and closed. 

Common Gate Valves Used in Oil and Gas Industry

  • Wedge Gate Valves
  • Knife Gate Valves
  • Parallel Slide Gate Valves
  • Pipeline Slab Gate Valves

#6. Plug Valves

Valve plug an oil pipeline in the field on a sunny summer day

Plug valves feature disks that are conical or cylindrical and tapered that rotate to start or stop the flow of medium through a pipeline. The horizontal disk usually has a hollow side. When the hollow side is parallel to the flow, the medium can pass through unobstructed. As the disk rotates, the hollow side follows suit and the flow of medium is blocked. 

Plug valves usually have more than one port, so they can be used to separate the flow of different kinds of mediums. However, the tapered disk of a plug valve means they have reduced port. This means they require more force to actuate. They are smaller in the size and have minimum resistance flow.

Common Plug Valves Used in Oil and Gas Industry

  • Lubricated Plug Valve
  • Non-Lubricated Plug Valve
  • Centric Plug Valve
  • Expanding Plug Valve

What are the Applications of Valves in Oil and Gas Industry?

Oil and gas exploration and operations have become more complex over the ages. As explorers need to dig deeper to extract crude oil and natural gas, they have to face extremely high-temperatures (greater than 1,500 For 816 C) and high pressures (greater than 25,000 PSIG) and extremely low temperatures like cryogenic (-150 F or -101 C) or cryogenic for LNG (-260 F or -162 C). Hence, the valves needed for these piping systems have to be durable, strong, resilient, and most of all reliable. For example, deep-sea valves operating 10,000 feet below the sea surface should be able to handle the low temperatures and high-pressure flow of materials, while those exposed to the extreme tempera­tures found in a desert need to protect both the machinery and the medium flowing inside from any contamination. 

For upstream operations in the oil and gas industry, valves need to control the flow of crude oil and natural gas from high-pressure injection systems to choke valves as well as blow-out preventers at the top of wells. Since exploration and production operations usually have to work in extreme conditions, the valves used in this stage need to be strong, durable, non-corrosive, and fully leak-proof. They also have to be suitable for high-temperature, high-pressure applications. Gate valves made of higher alloy materials and ball valves are most suitable for upstream operations. 

Oil valve with rocking in the background

Midstream applications require the transportation of oil and gas. There are two kinds of pipelines used in the energy industry, ones that transport crude oil and others that transport natural gas. Within each pipeline system, there are smaller pipelines that are required for specific applications. For example, oil pipelines transport crude oil collected from the source to a refinery. Once refined, another set of pipelines transport refined the oil to the end-users. No matter what kind of pipeline is used, it needs to have highly reliable isolation valves that guarantee proper function and protection. Normally full-port gate and ball valves made of different kinds of materials are used in midstream applications. Compressor stations usually use nozzle check valves with low pressures and rapid responses to changes in the flow to energize the media for long pipelines.

Downstream operations like refining are marred with harsh environments. High-temperature environments can cause a phenomenon called delayed coking that can add extreme pressure on the valves damaging them. Coking fines are also highly abrasive so they can easily damage the seat, disc, stem, and other components of a valve. Downstream applications usually employ high-quality, sturdy gate valves that heat-dissipating fins and remotely controlled operating systems. 

Conclusion

All valves can start and stop the flow of medium through any piping system. However, not all valves are the same. For example, gate valves are more suited for high-temperature, high-pressure on/off applications where the valve is used infrequently. But they can only carry liquids and viscous liquids, Ball valves can be used to regulate the flow of slurry or corrosive materials as well. No matter what valve you require, STV offer  a wide variety of high-quality valves that can be used for a number of applications across different industries. What’s more, it offers valve quality control and manufacture for specific valves.

Our extensive network of sales and lifelong consulting services means you will get a quality product at incomparable prices. We distribute our products to North and South America, Middle East, South East Asia, Africa, and beyond. Get in touch with one of our esteemed engineers today.

2021年8月18日星期三

API 600 Trim of Valves

Trim of Valves



THE REMOVABLE AND REPLACEABLE VALVE INTERNAL PARTS that come in contact with the flow medium are collectively termed as VALVE TRIM. These parts include valve seat(s), disc, glands, spacers, guides, bushings, and internal springs. The valve body, bonnet, packing, et cetera that also come in contact with the flow medium are not considered valve trim.

A Valve's trim performance is determined by the disk and seat interface and the relation of the disk position to the seat. Because of the trim, basic motions and flow control are possible. In rotational motion trim designs, the disk slides closely past the seat to produce a change in flow opening. In linear motion trim designs, the disk lifts perpendicularly away from the seat so that an annular orifice appears.

Valve trim parts may be constructed of assorted materials because of the different properties needed to withstand different forces and conditions. Bushings and packing glands do not experience the same forces and conditions as do the valve disc and seat(s).

Flow-medium properties, chemical composition, pressure, temperature, flow rate, velocity and viscosity are some of the important considerations in selecting suitable trim materials. Trim materials may or may not be the same material as the valve body or bonnet.

API has standardized trim materials by assigning a unique number to each set of trim materials.

 

API 600  Trim 1

NOMINAL TRIM

410

 
TRIM CODE

F6

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6 (13Cr) (200 HBN)

 
SEAT SURFACE

410 (13Cr)(250 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.75Ni-1Mn


SERVICE

For oil and oil vapors and general services with heat treated seats and wedges. General very low erosive or non-corrosive service between -100°C and 320°C. This stainless steel material lends itself readily to hardening by heat treatment and is excellent for contacting parts such as stems, gates, and discs. Steam, gas and general service to 370°C. Oil and Oil vapor 480°C.

 

API 600  Trim 2

NOMINAL TRIM

304

 
TRIM CODE

304

 
STEM AND OTHER TRIM PARTS

304

 
DISC/WEDGE

304 (18Cr-8Ni)

 
SEAT SURFACE

304 (18Cr-8Ni)

 
TRIM MATERIAL GRADE

19Cr-9.5Ni-2Mn-0.08C


SERVICE

For moderate pressure in corrosive, low erosive service between -265°C and 450°C.

 

API 600  Trim 3

NOMINAL TRIM

310

 
TRIM CODE

310

 
STEM AND OTHER TRIM PARTS

(25Cr-20Ni)

 
DISC/WEDGE

310 (25Cr-20Ni)

 
SEAT SURFACE

310 (25Cr-20Ni)

 
TRIM MATERIAL GRADE

25Cr-20.5Ni-2Mn


SERVICE

For moderate pressure in corrosive or non corrosive service between -265°C and 450°C.

 

API 600  Trim 4

NOMINAL TRIM

410 - Hard

 
TRIM CODE

F6H

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6 (13Cr) (200-275 HBN)

 
SEAT SURFACE

F6 (13Cr) (275 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.75Ni-1Mn


SERVICE

Seats 275 BHN min. As trim 1 but for medium pressure and more corrosive service.

 

API 600  Trim 5

NOMINAL TRIM

410 - Full Hard faced

 
TRIM CODE

F6HF

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6+St Gr6 (CoCr Alloy) (350 HBN min)

 
SEAT SURFACE

410+St Gr6 (CoCr Alloy) (350 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.5Ni-1Mn/Co-Cr-A


SERVICE

High pressure slightly erosive and corrosive service between -265°C and 650°C and higher pressure. Premium trim service to 650°C. Excellent for high pressure water and steam service.

 

API 600  Trim 5A

NOMINAL TRIM

410 - Full Hard faced

 
TRIM CODE

F6HF

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6+Hardf. NiCr Alloy (350 HBN min)

 
SEAT SURFACE

F6+Hardf. NiCr Alloy (350 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.5Ni-1Mn/Co-Cr-A


SERVICE

As trim 5 where Co is not allowed.

 

API 600  Trim 6

NOMINAL TRIM

410 and Ni-Cu

 
TRIM CODE

F6HFS

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

Monel 400® (NiCu Alloy) (250 HBN min)

 
SEAT SURFACE

Monel 400® (NiCu Alloy) (175 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.5Ni-1Mn/Ni-Cu


SERVICE

As trim 1 and more corrosive service.

 

API 600  Trim 7

NOMINAL TRIM

410 - Very Hard

 
TRIM CODE

F6HF+

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6 (13Cr) (250 HBN min)

 
SEAT SURFACE

F6 (13Cr) (750 HB)

 
TRIM MATERIAL GRADE

13Cr-0.5Ni-1Mo/13Cr-0.5Ni-Mo


SERVICE

Seats 750 BHN min. As trim 1 but for higher pressure and more corrosive/erosive service.

 

API 600  Trim 8

NOMINAL TRIM

410 - Hard faced

 
TRIM CODE

F6HFS

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

410 (13Cr) (250 HBN min)

 
SEAT SURFACE

410+St Gr6 (CoCr Alloy) (350 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.75Ni-1Mn/1/2Co-Cr-A


SERVICE

Universal trim for general service requiring long service life up to 593°C. As trim 5 for moderate pressure and more corrosive service. Steam, gas and general service to 540°C. Standard trim for gate valves.

 

API 600  Trim 8A

NOMINAL TRIM

410 - Hard faced

 
TRIM CODE

F6HFS

 
STEM AND OTHER TRIM PARTS

410 (13Cr) (200-275 HBN)

 
DISC/WEDGE

F6 (13Cr) (250 HBN min)

 
SEAT SURFACE

410+Hardf. NiCr Alloy (350 HBN min)

 
TRIM MATERIAL GRADE

13Cr-0.75Ni-1Mn/1/2Co-Cr-A


SERVICE

As trim 5A for moderate pressure and more corrosive service.

 

API 600  Trim 9

NOMINAL TRIM

Monel®

 
TRIM CODE

Monel®

 
STEM AND OTHER TRIM PARTS

Monel® (NiCu Alloy)

 
DISC/WEDGE

Monel 400® (NiCu Alloy)

 
SEAT SURFACE

Monel 400® (NiCu Alloy)

 
TRIM MATERIAL GRADE

70Ni-30Cu


SERVICE

For corrosive service to 450°C such as acids, alkalies, salt solutions, etc. Very corrosive fluids.
Erosive-corrosive service between -240°C and 480°C. Resistant to sea water, acids, alkalies. Has excellent corrosion resistance in chlorine and alkylation service.

 

API 600  Trim  10

NOMINAL TRIM

316

 
TRIM CODE

316

 
STEM AND OTHER TRIM PARTS

316 (18Cr-Ni-Mo)

 
DISC/WEDGE

316 (18Cr-Ni-Mo)

 
SEAT SURFACE

316 (18Cr-Ni-Mo)

 
TRIM MATERIAL GRADE

18Cr-12Ni-2.5Mo-2Mn


SERVICE

For superior resistance to corrosion for liquids and gases which are corrosive to 410 stainless steel up to 455°C. As trim 2 but a higher level of corrosive service. Provides excellent resistance to corrosive media at high temperatures and toughness for service at low temperatures. Low temperature service standard for 316SS valves.

 

API 600  Trim 11

NOMINAL TRIM

Monel - Hard faced

 
TRIM CODE

MonelHFS

 
STEM AND OTHER TRIM PARTS

Monel® (NiCu Alloy)

 
DISC/WEDGE

Monel® (NiCu Alloy)

 
SEAT SURFACE

Monel 400®+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

70Ni-30Cu/1/2Co-Cr-A


SERVICE

As trim 9 but for medium pressure and more corrosive service.

 

API 600  Trim 11A

NOMINAL TRIM

Monel - Hard faced

 
TRIM CODE

MonelHFS

 
STEM AND OTHER TRIM PARTS

Monel® (NiCu Alloy)

 
DISC/WEDGE

Monel® (NiCu Alloy)

 
SEAT SURFACE

Monel 400T+HF NiCr Alloy (350 HBN min)

 
TRIM MATERIAL GRADE

70Ni-30Cu/1/2Co-Cr-A


SERVICE

As trim 9 but for medium pressure and more corrosive service.

 

API 600  Trim 12

NOMINAL TRIM

316 - Hard faced

 
TRIM CODE

316HFS

 
STEM AND OTHER TRIM PARTS

316 (Cr-Ni-Mo)

 
DISC/WEDGE

316 (18Cr-8Ni-Mo)

 
SEAT SURFACE

316+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

18Cr-12Ni-2.5Mo-2Mn1/2Co-Cr-A


SERVICE

As trim 10 but for medium pressure and more corrosive service.

 

API 600  Trim 12A

NOMINAL TRIM

316 - Hard faced

 
TRIM CODE

316HFS

 
STEM AND OTHER TRIM PARTS

316 (Cr-Ni-Mo)

 
DISC/WEDGE

316 (18Cr-8Ni-Mo)

 
SEAT SURFACE

316 Hardf. NiCr Alloy (350 HBN min)

 
TRIM MATERIAL GRADE

18Cr-12Ni-2.5Mo-2Mn1/2Co-Cr-A


SERVICE

As trim 10 but for medium pressure and more corrosive service.

 

API 600  Trim  13

NOMINAL TRIM

Alloy 20

 
TRIM CODE

Alloy 20

 
STEM AND OTHER TRIM PARTS

Alloy 20 (19Cr-29Ni)

 
DISC/WEDGE

Alloy 20 (19Cr-29Ni)

 
SEAT SURFACE

Alloy 20 (19Cr-29Ni)

 
TRIM MATERIAL GRADE

29Ni-19Cr-2.5Mo-0.07C


SERVICE

Very corrosive service. For moderate pressure between -45°C and 320°C.

 

API 600  Trim 14

NOMINAL TRIM

Alloy 20 - Hard faced

 
TRIM CODE

Alloy 20HFS

 
STEM AND OTHER TRIM PARTS

Alloy 20 (19Cr-29Ni)

 
DISC/WEDGE

Alloy 20 (19Cr-29Ni)

 
SEAT SURFACE

Alloy 20 St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

29Ni-19Cr-2.5Mo-0.07C/1/2Co-Cr-A


SERVICE

As trim 13 but for medium pressure and more corrosive service.

 

API 600  Trim 14A

NOMINAL TRIM

Alloy 20 - Hard faced

 
TRIM CODE

Alloy 20HFS

 
STEM AND OTHER TRIM PARTS

Alloy 20 (19Cr-29Ni)

 
DISC/WEDGE

Alloy 20 (19Cr-29Ni)

 
SEAT SURFACE

Alloy 20 Hardf. NiCr Alloy (350 HBN min)

 
TRIM MATERIAL GRADE

29Ni-19Cr-2.5Mo-0.07C/1/2Co-Cr-A


SERVICE

As trim 13 but for medium pressure and more corrosive service.

 

API 600  Trim 15

NOMINAL TRIM

304 - Full Hard faced

 
TRIM CODE

304HS

 
STEM AND OTHER TRIM PARTS

304 (18Cr-8Ni-Mo)

 
DISC/WEDGE

304St Gr6

 
SEAT SURFACE

304+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

19Cr-9.5Ni-2Mn-0.08C/1/2Co-Cr-A


SERVICE

As trim 2 but more erosive service and higher pressure.

 

API 600  Trim 16

NOMINAL TRIM

316 - Full Hard faced

 
TRIM CODE

316HF

 
STEM AND OTHER TRIM PARTS

316 HF (18Cr-8Ni-Mo)

 
DISC/WEDGE

316+St Gr6 (320 HBN min)

 
SEAT SURFACE

316+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

18Cr-12Ni-2.5Mo-2Mn/Co-Cr-Mo


SERVICE

As trim 10 but more erosive service and higher pressure.

 

API 600  Trim 17

NOMINAL TRIM

347 - Full Hard faced

 
TRIM CODE

347HF

 
STEM AND OTHER TRIM PARTS

347 HF (18Cr-10Ni-Cb)

 
DISC/WEDGE

347+St Gr6 (350 HBN min)

 
SEAT SURFACE

347+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

18Cr-10Ni-Cb/Co-Cr-A


SERVICE

As trim 13 but more corrosive service and higher pressure. Combines good corrosion resistance with high temperature resistance up to 800°C.

 

API 600  Trim 18

NOMINAL TRIM

Alloy 20 - Full Hardfaced

 
TRIM CODE

Alloy 20 HF

 
STEM AND OTHER TRIM PARTS

Alloy 20 (19Cr-29Ni)

 
DISC/WEDGE

Alloy 20+St Gr6 (350 HBN min)

 
SEAT SURFACE

Alloy 20+St Gr6 (350 HBN min)

 
TRIM MATERIAL GRADE

19 Cr-29Ni/Co-Cr-A


SERVICE

As trim 13 but more corrosive service and higher pressure. Water, gas or low pressure steam to 230°C.

 

API 600  Trim Special

NOMINAL TRIM

Bronze

 
TRIM CODE

Bronze

 
STEM AND OTHER TRIM PARTS

410 (CR13)

 
DISC/WEDGE

Bronze

 
SEAT SURFACE

Bronze

 
TRIM MATERIAL GRADE

...


SERVICE

Water, oil, gas, or low pressure steam to 232°C.

 

API 600  Trim Special

NOMINAL TRIM

Alloy 625

 
TRIM CODE

Alloy 625

 
STEM AND OTHER TRIM PARTS

Alloy 625

 
DISC/WEDGE

Alloy 625

 
SEAT SURFACE

Alloy 625

 
TRIM MATERIAL GRADE

...


SERVICE

...

 

API 600  Trim NACE

Specially treated 316 or 410 trim combined with B7M bolts and 2HM nuts to meet NACE MR-01-75 requirements.

 

API 600  Trim Full Stellite

Full Hardfaced trim, suitable for abrasive and severe services up to 1200°F (650°C).

Note:

Data provided about API Trim numbers is for informational purposes only. Always consult current API publications to verify information and trim date.

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