Mainly used for water purification, water, sewage, water source such as the medium for, drain pipe installation, check the water pump outlet to the globe, backflow, eliminate the destructive water hammer, protected pipe, water pump running safety. Its main characteristics are as follows: light weight, small structure length, rubber soft seal, sealed performance is good, wear resistance and long service life, smaller resistance than old-fashioned check valve, have obvious effect in energy saving.