Radiator Condenser Fan ,Condenser Fan,Condenser Fan Motor,Radiator Fan Motor Ruian Mingguan Electric Co.,Ltd , https://www.minguanautoparts.com1, open the valve access, filled with water (or kerosene) valve cavity, and pressure to the strength test requirements of pressure, check the body, bonnet, gaskets, packing leakage. 2, shut off the valve, pressure on the valve side to the nominal pressure, check whether leakage from the other side. 3, the valve upside down, the opposite side of the test.