What is the function of the foot valve?

The Foot valve consists of valve evaluation, disc, bonnet, bushing, sealing ring and other parts. See the water from the water source in the figure below from the bonnet to the valve body. Under the action of fluid pressure, the valve disc opens water.

When the pressure in the outlet pipe closes the valve disc rapidly after stop, the liquid will not be poured back to the water source, which plays the role of unblocked pumping and saving water energy loss.

  1. Check valves should be installed on equipment, installations and pipes to prevent medium backflow.
  2. Check valves are generally suitable for cleaning media, not for media containing solid particles and high viscosity.
  3. Vertical lift check valves should be generally used in horizontal pipelines with nominal diameter of 50mm.

what a wafer ball valve

Wafer ball valve is Introducing a new type of thin-type ball valve that has been developed after absorbing foreign advanced production technology

The wafer ball valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be quickly opened and closed by only rotating 90°, and the operation is simple, and the valve has good fluid control characteristics. When the ball valve is in the fully open position, the thickness of the valve plate is the resistance of the medium flowing through the valve body, so the pressure drop generated by the valve is small, so that the flow control characteristic is good. The tower valve has two sealing types: a spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the valve plate.

The wafer ball valve is also widely used in chemical, petrochemical, smelting, medicine, food and other industries in SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, Use as a regulating and shut-off device in the pipeline of medium such as sulfuric acid or phosphoric acid

STV Delivery Forged Steel Wafer Ball Valve,150LB,F316L,DN50

Product Name: Forged Steel Wafer Ball Valve,150LB,F316L
Connect form: flange.
Size: 1/2″ – 4″.
Suitable medium: water, oil, steam,
Suitable temperature: -40 – +150°C.
Working pressure: 1.6 -2.4 – 6.4.
Main material: A105.F304 ,F316,F316L.
Design and manufacture adoption: ISO, API, GB, BS, we are strict with the security
and quality ,it was accepted by clients and sells to internal, external market.

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Ball Valves vs Gate Valves,Which is best for you?

In the market, the valve products are more. Generally, there are many ball valves and gate valves. For those who want to buy two products, they will know what kind of use and function and the difference between the two before buying. How to choose good quality ball valve and gate valve. For this reason, I have summarized some knowledge about ball valves and gate valves. Just tell you the difference between a ball valve and a gate valve? What should you pay attention to when using the gate valve?

1, gate valve

The advantages of the gate valve are small resistance, tight shut-off, and no water hammer, which are widely used in various liquid and gas shut-off valves. It also has a certain adjustment function, but when it is partially opened, the shutter is easily wetted by the fluid, and when the fluid flows, it will cause the board to vibrate and the sealing surface is easy to wear.
The gate valve is one of the commonly used shut-off valves. It is mainly used to turn on or off the medium in the pipeline, and is not suitable for regulating the flow of the medium. The valve is suitable for a wide range of pressures, temperatures and calibers, especially for medium and large diameter pipes.

2, the ball valve

(1) The ball valve has a simple structure, the ball valve is lighter in weight than the gate valve, the structure is relatively simple, and the overall weight is very light, so it can exert a good effect in the low temperature medium system; the sealing surface is easy to process, and the sealing property is good. Easy to operate, quick switch, short start-up and shut-down time, can quickly optimize the test system, and no impact during valve start-up and shutdown.

(2) It can not be used to adjust the flow rate. It is suitable for high pressure (up to 320 gauge) pipelines. Currently, it can only be used below 200 °C due to the limitation of sealing materials. It can also be used for suspensions and viscosities. Medium. Moreover, its adjustment performance is worse than the shut-off valve, especially the pneumatic valve (or electric valve).

Stv Valve Technology Group has a full line of gate valves and ball valves, in addition to many other types of valves. See what we have here.

How to choose the stainless steel valve

  1. 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 .

What is the Working principle and characteristics of stainless steel 3-way ball valve

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:

  1. 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.
  2. 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.
  3. Low torque design. The specially designed valve stem can be easily opened and closed with a small handle.
  4. 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.
  5. 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.

How to Identification of BSPP,BSPT, NPT threads?

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

STV Delivery 1000wog L Port 3 Way Ball Valve with Locking Handle

Today we have delivered 800PCS three-way ball valves to our customers. 1000wog L Port 3 Way Ball Valve with Locking Handle,DN15,SS304,BSPT END,800PCS

Product Name1000wog L Port 3 Way Ball Valve with Locking Handle
Bodystainless steel 304
Threaded StandardBSPT
ApplicationIndustrial Usage, Water Household Usage
Temperture Range-20–200degree
ConnectionFemale Threaded
Suitable mediumwater, oil, air and some corrosive liquid etc(WOG)

We have a huge range of 3 way ball valve manufacture,3 way ball valve 3/8,3 way ball valve full bore,3 way ball valve drawing,3 way ball valve datasheet,3 way ball valve dn50,3 way ball valve l port,3 way ball valve l&t,l port 3 way ball valve if you can’t find what you’re looking for, please get in touch with our sales team who will help you find what you need.

Stv delivey 4 Inch Carbon Steel Gate Valve,150LB

CAST STEEL GATE VALVE,RISING STEM, HANDWHEEL FLANGED-ENDS RF TO ANSI B16.10,BODY , BONNET: CAST STEEL A216 WCB STEM: A182 F6,TRIM: 13% CR,PAINTING: BRIGHT ALUMINIUM GREY PAINTED CLASS 150, 4″ 40PCS Very beautiful appearance, completed on time, ready to be sent to customers in Belgium。

Correct installation of the butterfly valve

1, the installation position, height, import and export direction must meet the design requirements, the connection should be firm and compact 0.2), all kinds of manual valves installed on the insulation pipe, the handles must not be downward.
2, the valve must be visually inspected before installation, the nameplate of the valve should comply with the current national standard “General Valve Mark” GB 12220. For valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipe, the strength and tight performance tests shall be carried out before installation, and shall be used after passing the test. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 minutes, and the valve casing and the packing should be qualified without leakage. In the rigorous test, the test pressure is 1.1 times of the nominal pressure; the test pressure shall meet the requirements of GB 50243 in the duration of the test, and the leakage of the valve sealing surface shall be qualified.

The wafer type butterfly valve is one of the most common types of valves in industrial pipelines. The structure of the wafer type butterfly valve itself is relatively small. Just put the butterfly valve in the middle of the flanges at the two ends of the pipeline, and use the double stud bolts to pass through the pipeline flanges and pairs. Clip-on butterfly valves lock the fluid medium in the line. Wafer-type butterfly valves are especially suitable for places where space is limited or where the distance between pipes is short. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very low. Small, so it has better flow control characteristics.