STV Delivery Wafer Knife Gate Valve,304,150LB,To Canada,60PCS

KNIFE GATE VALVE CLASS 150# , CF8 BODY ,
304 / PTFE TRIM , WAFER TYPE 
SIZE 4″ ” STV ” KG151 60PCS

wafer knife gate valve dimensions

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Different Butterfly Valve Vs Ball Valve, triple offset butterfly valve vs ball valve

We all know that there are many kinds of ball valves, including this butterfly valve is one of them. Then the well-known difference between ball valve and butterfly valve is its opening and closing parts, the opening and closing parts of butterfly valve are plates, and the ball valve is a ball. They all rotate around one of their axes. Let’s go on and see what’s the difference between butterfly and ball valves.

Distinction One

Ball valves and butterfly valves have different cut-off modes: ball valves block the passage through the ball to achieve pipeline cut-off flow; butterfly valves rely on butterfly wings, laying the sealed pipeline will not flow.

Difference 2

The structure of ball valve and butterfly valve is different: ball valve is made of valve body, spool and stem assembly, only part of the parts can be seen in the body; butterfly valve is made up of valve body, seat, valve plate and stem, all parts are exposed outside. So it can be seen that the sealing of butterfly valve is not as good as that of ball valve. Speaking of sealing, butterfly valves are also divided into soft and hard seals. Butterfly valve structure is relatively simple, can only be used in low pressure environment, the maximum pressure is only 64 kg. Compared with ball valves, ball valves can be up to about 100 kilograms.

Distinction 3

The working principle of ball valve and butterfly valve is different: the ball valve has 90 degrees rotation action, because its opening and closing parts are spheres, only need to operate 90 degrees rotation to open or close, which is the most suitable switch. But now V-type ball valves can be used to regulate or control flow. The butterfly valve is a kind of valve which uses disc-type hoist to turn back and forth about 90 degrees to open, close or regulate medium flow. It has good function of regulating flow and is one of the fastest-growing valve varieties.

Comparison of Butterfly Valve and Ball Valve

Advantages of butterfly valve 1: simple structure, small size, light weight; Disadvantage is that the use of pressure and working temperature is much smaller than the spherical valve range.

Advantages of butterfly valves 2: Good sealing can be achieved under low pressure; Disadvantage is that the sealing performance is much worse than that of ball valves.

Advantages of butterfly valve 3: It can transport mud, and has the least liquid in the pipe mouth, which is better than ball valve.

Advantages of butterfly valves 4: The structure principle of butterfly valves is more suitable for large caliber valves, which are widely used in petroleum, gas, chemical and other industries.

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difference between gate valve globe valve and butterfly valve 

One. Opening and closing parts are different

1. Gate valve: The opening and closing part is the gate, the movement direction of the gate is perpendicular to the direction of the fluid.
2. Butterfly valve: The opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body.
3. Globe valve: The opening and closing parts are plug-shaped discs, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid.

1. Different Characteristics
2. Gate valve: light weight, flat bottom gate seat, integral glue coating, precision casting valve body.
3. Butterfly valves: simple structure, small size, light weight, low material consumption, small installation size, fast switching, 90 degree reciprocating rotation, small driving moment and other characteristics. They are used to cut off, connect and regulate the medium in the pipeline. They have good fluid control characteristics and sealing performance.
4. Globe valve: The stem opening or closing stroke of this kind of valve is relatively short, and it has a very reliable cut-off function. Because the change of the seat opening is proportional to the disc travel, it is very suitable for flow regulation.
5. Different working principles
6. Gate valve: The gate plate of the gate valve moves in a straight line with the stem. It is called lifting bar gate valve, or open bar gate valve. Usually there are trapezoidal threads on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is to say, the operating torque is changed into the operating thrust.
7. Butterfly valve: A valve that opens, closes or regulates the flow of medium by reciprocating about 90 degrees with disc-type opening and closing parts. The butterfly valve not only has simple structure, small volume, light weight, less material consumption, small installation size, small driving moment, simple operation and rapid, but also has good flow regulation function and sealing characteristics.
8. Globe valve: The closing principle of stop valve is to make the sealing surface of disc and seat close together by the pressure of valve rod to prevent the flow of medium. Our country’s valve “three-way feed” once stipulated that the flow direction of globe valve should be from top to bottom, so there is directionality in installation.

Tags: difference between gate valve globe valve and butterfly valve

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STV DELIVERY THE WAFER CHECK VALVE,150LB,CF8M,DN300,2PCS

July 28, 2019/0 Comments/in INDUSTRY NEWS, NEWS & EVENTS /by stvvalves

VALVE:CHECK;STEEL,
300DIAX180MM L,
WAFER TYPE
QNSI SER#150 DBL
DISC 316+EPDM SEAT
APPLICATION:
POTABLE WATER
MFR: STV
CORPORATION OR
EQUIVALENT” NOTE:
SEAT MATERIAL: TO
BE
ADVISEDHS:848180409
0

The WAFER check valve refers to a valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, which is also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve whose main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. The check valve can also be used to supply a line in which the pressure may rise to an auxiliary system that exceeds the system pressure. The check valve can be mainly divided into a swing type check valve (rotation according to the center of gravity) and a lift check valve (moving along the axis)

working principle
The function of this type of valve is to allow only the medium to flow in one direction and to prevent the flow in the opposite direction. Usually, the valve is automatically operated, and the valve flap is opened by the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat to cut off the flow.
Among them, the stainless steel wafer type check valve belongs to this type of valve, and includes a swing type check valve and a lift check valve. The swing check valve has a hinge mechanism and a door-like flap that rests freely against the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface each time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swinging space and the valve flap is truly and comprehensively in contact with the valve seat. The flaps can all be made of metal, or they can be inlaid with leather, rubber, or synthetic coverings depending on the performance requirements. With the swing-open check valve fully open, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The valve flap of the lift check valve is located on the valve seat sealing surface of the valve body. In addition to the flap being free to lift and lower, the valve is like a shut-off valve. The fluid pressure causes the flap to lift from the seat sealing surface. The backflow of the medium causes the flap to fall back onto the seat and shut off the flow. Depending on the conditions of use, the flap can be of all metal construction or it can be in the form of a rubber or rubber ring on the valve disc holder. Like the shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is limited. Very few].

Technical Parameters
Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K
Nominal diameter or caliber: DN15～900, NPS 1/4～36
Connection method: flange, butt welding, thread, socket welding, etc.
Applicable temperature: -196 ° C ~ 540 ° C
Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti.
Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

Tags: carbon steel check valve, cast steel check valve, dual check valve, forged steel check valve, lift check valve, piston check valve, stainless steel check valve, swing check valve, wafer check valve

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