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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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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

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.

Butterfly Valve Types

The butterfly valve is a valve that opens and closes and closes the fluid passage by reciprocating about 90° with a disc type opening and closing member. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy to operate, and quick, and also has good flow adjustment function and closed sealing performance, and is made of different materials. The butterfly valve can also be applied to various corrosive medium pipelines, and is one of the fastest growing valve varieties in the past decade.

The advantage of Butterfly Valve

Butterfly valves are most often used to regulate the flow of gases, liquids, or slurries. Because they can be designed with reference to specific pressure requirements and usage patterns, their applications are very broad. Some of the more common include:

1, easy to open and close, labor-saving, small fluid resistance, can be operated frequently.
2, simple structure, small size, short structure length, small size, light weight, suitable for large diameter valves.
3, the mud can be transported, and the liquid is accumulated at the mouth of the pipe at least.
4, under low pressure, can achieve a good seal.
5, the adjustment performance is good.
6, the valve seat channel has a large effective flow area and a small fluid resistance.
7, the opening and closing torque is small, because the butterfly plates on both sides of the rotating shaft are basically equal to the medium, and the direction of the torque is opposite, so the opening and closing is more labor-saving.
8, the sealing surface material is generally made of rubber or plastic, so the low-pressure sealing performance is good.
9, easy to install.
10, the operation is flexible and labor-saving, you can choose manual, electric, pneumatic, hydraulic.

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

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.

Some defects in the stainless steel valve market in China

China’s pump and valve market is less concentrated in the industry, mainly in the production of low-end products. In terms of owning core technologies, there is still a certain gap between domestic enterprises and developed countries in the world.

At present, there are still some problems in China’s valve industry. For example, Chinese valve companies mainly focus on low-level, small-scale, family-run enterprises. In terms of products, due to repeated investment and insufficient technology introduction, the leading products of Chinese valve enterprises are still low-quality mass products. It is understood that the current various valves produced by Chinese enterprises generally have shortcomings such as leakage, internal leakage, low appearance quality, short life, inflexible operation, and unreliable valve electric devices and pneumatic devices. Some products are only equivalent to the last century. At the international level in the early 1980s, some valves required for high temperature and high pressure and critical equipment still depended on imports.

China’s valve industry in the industrial structure, the industrial chain of industrial valves, and the degree of specialization of the industry have a large gap with foreign companies, resulting in low quality of domestic valve products: due to the rapid expansion of the market, the original state-owned valve companies have Shut down and turn. According to the survey of air-conditioning and refrigeration market, although a number of township and village enterprises have developed rapidly, due to the low starting point of township and village enterprises, the technical strength is very weak, and the equipment is simple. Most of the products are imitated, especially the low-pressure valves for water supply and drainage. The above problems do not affect the broad prospects of the Chinese valve industry in the future. This is mainly due to the support of national policies and the strong demand for the valve product market. In particular, the construction of several projects such as “West-East Gas Transmission”, “West-to-East Power Transmission” and “South-to-North Water Transfer” requires a large number of valve products. .

Last year, the total import and export volume of China’s valve industry reached US$24.1 billion, a year-on-year increase of 28.2%. The total export value was US$22.4 billion, a year-on-year increase of 29.3%; the total import value was US$201.34 billion, a year-on-year increase of 27%. With the recovery of the world economy, the import and export of Chinese valve products has also increased. However, due to the large gap in high-end technology compared with foreign manufacturers, in the future, product technology will become a constraint on the development of China’s valve products. bottleneck.

Until recently, Chinese valve manufacturers were limited to a few profitable target markets, such as Ethiopia, Sudan, Iran, Iraq and parts of Southeast Asia. These markets are small in scale, and the decision-making process is entirely dependent on price and limited profit margins. Chinese imported valve manufacturers must pay attention to the undeniable fact that if they want to survive in the future, they must improve their previous sluggish performance and obtain large export manufacturing profits. The main reason for the current lack of export revenue is that there are a lot of business opportunities in China’s domestic market, and the quality of equipment imported from China’s valve manufacturing is not enough to sell overseas.

Butterfly valve dimensions and models

The butterfly valve is a simple regulating valve, which is mainly composed of a valve body, a valve stem, a butterfly plate and a sealing ring. The valve body has a cylindrical shape with a short axial length and a built-in disc. The butterfly valve has the advantages of flexible operation and labor saving, and can be selected by manual, electric, pneumatic, hydraulic, and convenient installation, and is well received by everyone. I believe that many people don’t know much about the specifications and models of butterfly valves. Let’s take a look at the specifications and models of butterfly valves.

Butterfly valve advantages

  1. It is convenient, quick, labor-saving, and has low fluid resistance. It can be operated frequently.
  2. Simple structure, small size and light weight.

3, can transport mud

4, under low pressure, can achieve a good seal.

5, the adjustment performance is good.

Butterfly valve specifications and models

Model: D71X/F

Caliber: 40~800

Pressure: 1.6MPa

Material: cast iron, cast steel, stainless steel

Flanged butterfly valve

Model: D41X/D43H

Caliber: 50 ~ 1200

Pressure: 1.6MPa-4.0MPa

Material: cast iron, cast steel, stainless steel

Pneumatic hard seal butterfly valve

Model: D673H/D643H

Caliber: 50~2000

Pressure: 1.6MPa-4.0MPa

Material: cast iron, cast steel, stainless steel

Material: ductile iron, cast steel, alloy steel, stainless steel

The butterfly valve model indicates that the sequence code is generally: butterfly valve type code, butterfly valve transmission mode, butterfly valve connection form, butterfly valve structure form, butterfly valve sealing surface material or lining material, butterfly valve nominal pressure, butterfly valve body material, which is the most basic arrangement mode D341X. -16C.
The above is a brief introduction to the specification and model of the butterfly valve. It can be known from the above that the butterfly valve has a wide application range. The butterfly valve is widely used not only in general industries such as petroleum, gas, chemical, water treatment, but also for cooling of thermal power stations. water system. When installing the butterfly valve, you should pay attention to the valve flap to stop at the closed position. The opening position should be determined according to the rotation angle of the butterfly plate. The butterfly valve with the bypass valve should open the bypass valve before opening. I hope that the introduction of these butterfly valve specifications and models can help everyone.