The first type of check valves is the swing check valve. This valve consists of a disc that swings or sways on a hinge. When the disc swings off the seat, forward flow occurs. But when the flow stops, the disc sways back to the seat. In this way, it prevents backward flow.
View Details Swing check valves which include levers and weights are more suitable for conditions where there is a fear of the water hammer effect. For high pressure, high velocity, and inadequate back-pressure situations, swing check hammers with lever and external springs are used. In a ball check valve, a ball is present instead of a disc. This ball prevents backward flow by being lifted out of the outlet. This happens where the ball experiences pressure from the flow. As the pressure level lowers, the ball falls back to its original position and stops backward flow. The double check valve usually finds its use in applications where water supplies need to be protected from contamination. The DC valve is a check valve consisting of two check valves aligned in a series manner. Two principles are used here: The first principle of operation is that one check valve will work even if the other is jammed open. The second principle of operation is that when one valve closes, the pressure is reduced. This makes a more reliable seal and avoids leakage. Lift check valves are quite similar to globe valves and have the same arrangements. Therefore they can be used in all the piping systems where globe walls are used. The disc is in the form of pistons or balls whereas the seat is similar to the globe valve. These valves are suitable for services where pressure and velocity of service are high. The disc fits perfectly into the dashpot. The fluid in lift check valves must always enter from under the seat, and this will cause the piston or ball to rise by the pressure of the upward flow. And the piston or ball returns to its seat whenever the flow stops. This is mainly due to the effect of gravity. You will get efficient and thoughtful service from BSTV. The lift check valves are available in different body patterns such as horizontal, angular, and vertical body patterns. The dual check valve or butterfly valve consists of a disc divided into two parts along a middle line. The two doors open and close through a hinge. This valve also supports forward flow and prevents backflow. As this valve is small and relatively lightweight, it is very suitable for low-pressure services. The piston check valve is a type of lift check valve. The dashpot of the piston check-valve contains a piston as well as a cylinder. This dashpot acts as a cushion during its operation. The design is quite similar to lift check valves, so the flow is essentially the same. The stop check valve is a mixture of the lift check valve and globe valve. The stop check valve controls the flow irrespective of the direction of flow. Instead of gravity, this valve can be closed by an external mechanism. So flow occurs here regardless of the flow levels (whether forwards or backward). The stop check valve is useful to protect equipment from damages. The tilting disc check valve is like a swing check valve except that it is assisted by a spring. The media is found flowing around it. The tilting disc check valve is available in the lug design and wafer design, and it tilts up when the fluid flow gives it a steady pressure. When the flow level decreases, the disc goes back to its initial position. Silent Check Valves, Butterfly Check Valves, and more.2. Ball check valve
3. Double check valve
4. Lift check valve
5. Dual check valve
6. Piston check valve
7. Stop check valve
8. Tilting disc check valve
9. Other Check Valve Types
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