Technical requirements and pressure test of electric butterfly valve Technical requirements and pressure test of electric butterfly valve produced by Henan Guomao: 1. The material of casing and flange of electric butterfly valve is 20; The bolt material is 35; The brake screw material is 2CR13.
Rubber ring material: the medium is oil NBR I-2, and the medium is water neoprene III-2; 2. Except that the medium is oil, the steel parts of expansion joints of other applicable pipelines are subject to hot zinc treatment; In general, the installation size is L1. According to the purpose of joint use, it is feasible to adjust the value of L1, but the maximum straightness shall not exceed 1.5L1. Hydraulic test shall be carried out for electric butterfly valve: 1. DN65-150, with Pm=2.4mpa for sealing test; 2. DN200-400, conduct sealing test with Pm=1.5Mpa; The electric butterfly valve belongs to the joint in the pipeline compensator. The standard adopted by the general pipeline system is GB/T12456-2007 electric butterfly valve production. The earliest one is GB/T12456-1997 double flange expansion joint, which is composed of body, seal ring, gland, expansion spool and other main parts. On the basis of the original performance of the loose sleeve expansion joint, a limiting device is added, and the maximum expansion amount is locked with a double nut. The pipeline can expand and contract freely in the allowable expansion and contraction amount. Once the maximum expansion and contraction amount is exceeded, the limit will be reached to ensure the safe operation of the pipeline. It is especially suitable for the connection in the pipeline with vibration or a certain slope and turn.