
what is the difference between industrial swing type check valve and lift type check valve?
i want to know where we must use swing check valve and where we must use lift check valve in petrochemical companies. what are the differences ? are they different from the appearance? how can we distinguish between them visually?
Most swing check valves have a external plug on one or both sides of the body where there is access to the shaft. Lift checks do not have this feature.
As to vertical operation of swing checks. There are many swing checks that have a restraint feature built into the body so they can operate in either the horizontal or vertical position.
The main thing most people over look about check valves is the need for maintenance. The pivot pin on swing checks can wear and cause the clapper to not seat properly. In some services the internals can accumulate material and become fouled.
Most lift checks have a spring that can fail and cause the valve to malfunction. This is specially true if the valve is installed in the vertical position.
All checks should be periodically inspected to assure they can function properly.
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