Check valve characteristic curves called dynamic

Piping system the most important role is to avoid the check valve pipe machinery and mechanical equipment damaged by water hammer. Pump stops unexpectedly when the liquid flow rate decreases, the check valve gradually off small; short period of time, accelerate the flow of liquid begins to reverse, accelerated closure valve in closed  2 way manifolds , reverse liquid flow rate reaches vmax the valve closed, the flow rate of the reverse flow of liquid from the vmax to 0 immediately, immediately downstream of the check valve to produce water hammer pressure value H, and  Instrument valve manifolds  effect, affect the life of the pipeline equipment usually the check valve of the curve called dynamic characteristic curve of the valve closed curve is generated when the water hammer effect has an important role in the project is also taken to prevent or measures to reduce water hammer damage theoretical basis. currently there are many scholars valve dynamic characteristics were studied theoretically describes the dynamic characteristics of the check valve and spring on them.