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.
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.
When you choose valves and pipe fittings, thread is a very important feature you have to consider. No matter how well the product is made, a wrong thread type will make it useless. You have to determine the thread type before you order.
NPT Connections NPT (National Pipe Thread) seals are the most popular type of seal for pressure calibration systems in the U.S. and Canada. NPT male adapters have a taper thread that wedges into the female NPT adapter. They seal due to the “out of roundness principle” which means that the male stretches the female fitting until there is so much force that the connection can hold pressure. One of the challenges with this design is that if you connect stainless steel to stainless steel then over-tightening or poor lubrication can cause gauling and damage to the threads. Thread sealant is needed to seal but only 2 turns of thread sealant is required. Any more than that and the seal can leak around the thread sealant. Ralston Instruments has a wide variety of male NPT adapters , male Quick-disconnect NPT adapters, male NPT calibrator adapters, female NPT adapters, female NPT gauge adapters and female Quick-disconnect NPT gauge adapters.
BSPT Connections
BSPT (British Standard Pipe Thread) is similar to NPT except there are important differences. The angle across the flanks of threads (if you sliced the fitting in half long-ways and measured the angle from root to crest to root) is 55 degrees instead of 60 degrees as it is for NPT. Another important difference is that for many BSPT pipe sizes the thread pitch is different than NPT. Thus an NPT male will sometimes fit into a BSPT fitting or vice versa but they will not seal. This is a popular fitting in China and Japan but is very rarely used in North America unless the equipment to which it is attached was imported. Thread sealant is needed to seal the male and female fitting together. Ralston Instruments has adapters to both male BSPT adapters and female BSPT adapters.
BSPP Connections BSPP (British Standard Parallel Pipe) is most popular in the UK, Europe, Asia, Australia, New Zealand and South Africa. It is a parallel thread fitting that uses a bonded seal ring to do the sealing. This bonded ring seal is sandwiched in-between a shoulder on the male fitting and the face of the female fitting and is squeezed in place. BSPP pressure gauges have a longer male thread and use a copper crush washer that is squeezed in between the bottom of the male fitting and the bottom of the female BSPP hole forming a pressure tight seal. No thread sealant is needed to form a seal. Ralston Instruments has male BSPP adapters , female BSPP adapters, female BSPP gauge adapters, and female BSPP Quick-disconnect gauge adapters.
our company has mainly produces and sells : stainless steel threaded fittings , BSPP ball valves ,NPT threaded valves ,quick , welding pipe fittings ,pneumatic valves ,etc
Stainless steel 3-way ball valve anti-corrosion, anti-penetration, anti-friction multi-layer seal, valve seat with soft and hard double seal, increase the stability of the seal, valve body material: carbon steel, stainless steel, working temperature: -46 ° C ~ +200 ° C
Stainless steel 3-way ball valve is a relatively new type of ball valve, it has its own unique structure of some advantages.Stainless steel three-way ball valve has the advantages of small fluid resistance, simple structure, small volume, light weight, compact and Reliable, convenient operation, quick opening and closing, convenient maintenance and so on. The following details of the stainless steel tee ball valve working principle and stainless steel tee ball valve advantages.
It works as follows: A, the opening process 1 In the closed position, the ball is mechanically pressed by the valve stem and pressed against the valve seat. 2 When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and the bottom angular plane causes the ball to disengage from the valve seat. 3 The valve stem continues to lift and interacts with the guide pins in the spiral groove of the valve stem, causing the ball to start rotating without friction. 4 Until the fully open position, the stem is raised to the extreme position and the ball is rotated to the fully open position. B, the closing process 1 When closing, turn the handwheel clockwise, the valve stem begins to lower and the ball moves away from the seat. 2 Continue to rotate the hand wheel. The valve stem is subjected to the guide pin embedded in the upper spiral groove, so that the valve stem and the ball rotate at 90° at the same time. 3 When it is about to close, the ball has rotated 90° without contact with the seat. 4 In the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball, causing it to press tightly against the valve seat for a complete seal. Five, stainless steel three-way ball valve structure features:
Open and close without friction. This function completely solves the problem that the conventional valve affects the sealing due to the friction between the sealing faces.
Top-loading structure. The valve installed on the pipeline can be directly inspected and repaired online, which can effectively reduce the parking of the device and reduce the cost. This type of valve should generally be installed horizontally in the pipeline. 3, single seat design. It eliminates the problem that the cavity medium in the valve affects the safety of use due to abnormal boosting.
Low torque design. The specially designed valve stem can be easily opened and closed with a small handle.
Wedge seal structure. The valve is mechanically supported by the valve stem, and the ball wedge is pressed onto the valve seat to seal, so that the sealing property of the valve is not affected by the change of the pressure difference of the pipeline, and the sealing performance is reliably guaranteed under various working conditions.
Self-cleaning structure of the sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline passes through the spherical sealing surface at 360°, which not only eliminates the high-speed fluid scouring on the valve seat, but also washes away the accumulation on the sealing surface to achieve self-cleaning.
STV Valve Technology Group Co., Ltd is a professional leader China stainless steel 3-way ball valve Manufacture,stainless steel 3 way ball valve,high pressure stainless steel 3 way ball valve,1 stainless steel 3 way ball valve,1/2 stainless steel 3 way ball valve,1/4 3 way stainless steel ball valve,3 way actuated ball valve stainless steel,3 way flanged ball valve stainless steel.
Care must be taken when selecting a suitable stainless steel valve. In order to avoid ambiguity, you should have an understanding of stainless steel valves; 2, the requirements of the characteristics need to look at the flow resistance, discharge capacity, flow characteristics, sealing level and other information is how; 3. For the reliability and service life of the product, it is necessary to ask in detail; 4. If the chemical composition of the stainless steel valve does not meet the corresponding national standards, it does not need to be purchased and selected; 5. Because stainless steel valves are manual, electric, pneumatic, etc., it is necessary to clarify how the operation mode is; 6, when buying, you must choose a good after-sales service
Stainless steel valves are widely used in pipeline installations in petroleum, chemical, metallurgy, textile, food, shipbuilding, medical, environmental protection and other industrial sectors. They have the ability to resist atmospheric oxidation, ie, rust, and also contain acid. The ability of the alkali, salt medium to resist corrosion, that is, corrosion resistance.
STV Valve Technology Group Co., Ltd offers a wide range of stainless steel ball valve,stainless steel gate valve,stainless steel globe valve,stainless steel check valve,stainless steel foot valve .