The check valve is used in plumbing systems to control the flow of fluid through pipes. The flow rate can be controlled by physical measure, pressure or chemical reaction. With the help of this valve a controlled stream of fluid can be kept moving along the pipelines. Known also as front-back flow valves, check valves make sure that fluid flows from one side to the other direction. There are various check valve styles which perform one-way flow, using piston, ball and wafer butterfly valve bodies.
The most common type of check valve is the lift check. Also known as seat lift check valve, this is one-way valve and usually installed at the stem of the drain fitting. This performs the work of filtering the fluid and ensures that there is a constant stream of fluid coming through the seat so that it remains in motion and continues working. Lift check valves that use the piston technique are often installed inside the pipe and lift them above the seat.
When the direction of the flow gets changed, the position of the seat moves upward as well. Therefore, the piston check valve is not able to perform its function. In case the upward flow gets changed and there is no downward movement of the seat, then it does not matter what happens to the flow of fluid, as it will get trapped inside. If you have any concerns regarding where and ways to use this hyperlink, you could contact us at the website. It is known that when a flow gets trapped inside the seat, then there is no way for the fluid to leave the pipe, hence it tends to remain there.
Another problem faced by the lift check valve is the slow flow rates. As the seat moves up and down it causes a change in the hydraulic pressure, thereby altering the flow rates and causing a further decrease in the pressure. The main reason behind this problem is the blockage that occurs when the fluid gets stuck in the seat. If you find that the flow gets reduced at the stage of the piston's movement, then there might be something wrong with the lift rod.
Piston check valves that are used in heavy industries or those that are placed above the seating are usually of the up and over variety. They have been designed in such a way so that they are able to lift up and push down. If they are used in the usual fashion, then there is a possibility that the fluid will not be able to escape from the pipe. It is known that up and over piston check valves are of different compositions. The material that is used to manufacture them will determine the kind of problems that they might experience.
All the different types of lift type check valves are known to face problems with the passage of time. This is because they are subjected to wear and tear. The piston blower should also be checked often. If there are signs of wear and tear, then it is necessary to replace them immediately. The ball check valve, in contrast, are known to be very durable. It is not advisable to switch to another type of lifting device if the ball check valve is functioning properly.