This is a valve that provides control to any possible backflows in a piping system. It is designed to handle systems with pulsating flow and any reciprocating compressors. It has flanged ends as well. The ends are weld with carbon steel. The general details of the valve are indicated on the valve cover plate. This includes the size, materials, pressure class, temperature and also serial number as well as the ratings.

Piston Check valve operation

During operation, the valve’s internal piston moves into the sleeve which is supported by piston rings. The piston lifts up when the pressure increases thus the chamber on the top side of the piston compresses. The piston stops with an equalized driving force from the compressor. This induces the ball check to close thus sealing the area above the piston.

Maintenance of a piston check valve

To ensure continued efficiency of a piston check valve, one should have the valve cleaned and inspected regularly. However, these valves require minimal maintenance. Spare parts and repairs should be correctly done to avoid poor configuration. The body pressure should be eliminated before any internal servicing is done to the valve. Ensure the right class and sizes of spare parts are used when repairing the valves. If the piston is to be removed, the spring should be inspected for any necessary repair or replacement. To remove the seat, one should first pull out the valve body so as to have the liner removed.

Parts of a piston check valve

This type of a valve has various critical parts. It comes with a body and cover. These are mainly made of carbon steel plates which allow entry and enclosure of the valve. The valve features a piston which is sealed against the seat to avert any possible back flows.  A liner is also another important part of piston check valve. It has a replaceable sleeve in which the piston travels.

Piston rings are useful in guiding the piston through the liner. A seat is that part which is screwed into the body to offer a seal point for the piston. Other common piston check valve parts include pipe plug, internal seal ring, ball check, cover nut, and piston spring as well as the ring expanders. These types of valves are very important in modern piping systems.

Piston Check Valve





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