A Ball Valve, which is also known as a non-return valve, is a device that regulates the flow of liquid or gas in one direction. This ensures machines do not suffer damage from a potential reverse flow.
Lift Check Valve:This valve operates by having its disk lifted off the seat to permit downstream flow. When the upstream pressure returns to a higher condition, the disk closes. It requires little maintenance, as it has only one moving part and little wear.This type of valve utilizes a flapper attached to a hinge at the top of the valve to regulate the direction of flow in the valve. Forward flow through the valve causes the flapper to move up to the open position. Backward flow in the valve pushes the flapper back against the seat, closing the valve.
Swing Check Valve:Swing check valves are the most common in the market. They have a straight-body design or a Y-pattern.This style of valve uses a disc-shaped flapper attached to a hinge to regulate flow. Forward flow in the valve causes the flapper to rotate and open the valve. A reversed flow causes the flapper to rotate back to rest against the seat and close the valve.A butterfly-type valve has a disk that swings on a hinge-like apparatus to stop the flow. Large check valves are often this type. The disk is heavy, which causes damage over time to the seat as it closes, making it a higher-maintenance item.
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1. Fluid resistance is small, full bore Ball Valve little flow resistance.
2. Simple structure, small size and light weight.
3. Close and reliable. It has two sealing surfaces, and the current valve sealing surface material widely used in various plastics, sealing, and can be completely sealed. In the vacuum system has also been widely used.
4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate the remote control.
5. Easy maintenance, simple ball valve, seals are generally active, are relatively easy to replace demolished.
6. In the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, the medium through, will not cause erosion of the valve sealing surface.
7. Wide range of applications, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied.
8. As the ball in the open and close in the process of wiping nature, it can be used with suspended solid particles of the medium.
If you want to know more,please enter the following links:Floating Ball Valve,Trunnion Mounted Ball Valve,Top Entry Ball Valve
A check valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you “see” the valve’s position. The ball valve, along with the butterfly valve and plug valve, are part of the family of quarter turn valves.
Check valves are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications (and are often preferred to globe valves and gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose.
Check valves are used extensively in industrial applications because they are very versatile, supporting pressures up to 1000 bars and temperatures up to 200°C. Sizes typically range from 0.5 cm to 30 cm. They are easy to repair and operate.
The body of check valves may be made of metal, plastic or metal with a ceramic center. The ball is often chrome plated to make it more durable.
A ball-check valve is a type of check valve with a ball without a hole for a disc, and is not covered in this article.
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A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.
Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, and/or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.
An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the check valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
Heart valves are essentially inlet and outlet check valves for the heart ventricles, since the ventricles act as pumps.
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