Check valve pressure test method Test status: Lift check valve axis in the horizontal position and vertical; swing check valve and valve channel axis approximately parallel to the axis in the horizontal position. Strength test, the test medium is introduced from the inlet end to a predetermined value, and the other end closed, body and bonnet look no leakage in compliance. Tightness test from the outlet end of the introduction of the test medium, Shenzhen valves, the inlet end sealing surface inspection, Taiwan Toyama Valve Co., Ltd., packing and gaskets at no leakage in compliance. Turbo Double flange butterfly valve flange butterfly doors closed Note shutting, due to the media or the ambient temperature changes, pressure Valve Co., Ltd., a thermal expansion valve member between the gate and the seat will Guangzhou Kaiheng larger. This force is reflected in the stem threads, it is difficult to open the valve again, the torque required to open the valve (that is applied to the stem nut torque) is generally higher than the torque required to close the valve It is far greater. Tianjin Tanggu Watts Valve Co., Ltd., the Hong Kong valves (online consultation), Shenzhen valve by valve, the Hong Kong Science and Technology Co., Ltd. of Dongguan. Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Ming Kong valve leadership with the staff warmly welcome all inquiries negotiations to create a better valve out of Hong Kong in the future.