What is a swing check valve?

What is a swing check valve?

In swing check valves, a flapper will swing away to allow forward flow of a fluid or gas. When it is time to stop the flow, the flapper will swing back onto the seat, closing the valve automatically as the system pressure decreases. Swing check valves are notable due to their large flow capacity.

When would you use a swing check valve?

One of the most common uses of a swing check valve is the flapper valve in a flush-toilet mechanism. This allows water to enter from the bottom of the tank, but prevents it from draining out the same way. Swing check valves are the most common type of valve in water and wastewater pumping systems.

How does swing check valve open and close?

Swing check valves are also commonly referred to as ’tilting-disc’ check valves. They consist of a disc that is on a hinge (or trunnion) that swings open with an inlet pressure. As inlet pressure decreases or there is a backflow, the disc will swing shut.

What type of valve is a check valve?

automatic valves
Check valves are automatic valves that open with forward flow and close with reverse flow. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve.

What is difference between swing type and wafer type check valve?

The difference between the two is in the body design. Swing check valves are not designed for extremely tight spaces like the wafer check. Because wafer check valves are flanged in place, there isn’t much room for the disc to open in the pipe line. That means flow is often restricted with a wafer check valve.

Can we use swing check valve vertically?

We hear many people ask, “Can swing check valves be installed vertically?” The simple answer to that question is yes, swing check valves can be installed in both directions.

Do check valves restrict flow?

One, check valves are prone to jamming in the open position, thereby becoming an uncheck valve of sorts. Two, they are prone to jamming in the closed position, preventing water flow in any direction. And three, they can restrict water flow.

Does a check valve go before or after a pump?

The most common installation is at the pump. A check valve may be installed on the suction side of the pump to maintain the pump’s prime in the event of a pump shutdown. A check valve will be used commonly on the discharge of the pump to prevent backflow from the downstream system, when the pump shuts off.

Should a check valve be installed vertically?

Check valve can be installed in horizontal or vertical piping runs, with the flow running upward. Mounting for vertical installations is critical.

What are the 5 types of check valves?

Most common types of Check valves are swing, lift (piston and ball), butterfly, stop and tilting-disk.

What are the two types of check valves?

Check valves are unidirectional valves that provide unobstructed flow in one direction as long as flow pressure remains constant and protect the piping system against reverse flow. The three main types of check valves we offer are ball, piston, and stop check valves.

Why choose PK valves?

PK Valves is committed to the development and supply of high quality valves and related services for more than 60 years, and during that time we have taken a leading role in the advancement of designs, technology, and service. In the rapidly changing world of today and tomorrow, PK Valve will step up to the challenges and lead our industry.

What is a swing check valve used for?

SWING CHECK VALVE DESCRIPTION. Swing check valves, like all check valves, are used to prevent back flow in the line. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve.

Can a swing check valve be removed from a pipeline?

If your swing check valve has a true union design, it can easily be removed from the pipeline. These valves are available in many different forms. Metal swing check valves are often seen in heavy industrial use. However, a PVC swing check valve can often handle the same jobs and will be much less expensive.

How does a spring check valve work?

One iteration of the swing check valve is a spring check valve. These valves function in the same way as swing check valves, but they have a spring to stay closed when there is no flow in the correct direction. That means that as soon as fluid stops flowing through, the valve claps shut.