Seal test with nominal value of the test pressure test, the number of no less than twice, within a specified time no leakage in compliance. Leakage test in two ways: First, the valve seal all joints, the tissue seal affixed with butter in a flange on the El, tissue muster for the leak, Taiwan Toyama Valve Co., Ltd., is not qualified to muster; Second, the thin plastic plate with butter or other plate seal affixed in the lower outlet flange, irrigation valve seal, Guangzhou Kaiheng Valve Co., Ltd., the test water is not bubbling qualified. Safety valve constant pressure and reseating pressure of not less than three times the number of trials, compliance is qualified. The performance of the valve test, see GB / T 12242-1989 safety valve performance test method. " Clamp butterfly valve Features 1, efficient groove clamp contact and take the appropriate placement of pipe fittings, do not want to start the welding, Shenzhen valve, not to be a secondary zinc, secondary placement. Increase the placement rate. 2, light weight portable clamp contact, less the number of bolts, easy placement, unnecessary extra skills. 3, reliable scientific and rational planning the organ, unique C-type rubber seals to achieve triple seal, Shanghai Guanlong valve Machinery Co., guarantee the bond seal reliability. 4, safe contact with the trench and the corresponding clamp tube placement start, just mechanical assembly, no welding, no fire, therefore, no slag cloudy pipeline to ensure site safety, fire ban to commence the case under conditions , it is particularly appropriate. Shanghai Guanlong Valve Machinery Co., Ltd. | Ming Kong valve (Online) | Shenzhen valve provided by the Dongguan Science and Technology Co., Ltd., the Hong Kong valve. 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.