Valve body material nominal performance parameter editing (MPa) Operating temperature (℃) Suitable medium carbon steel 1.6-6.4≤425 water, oil, steam 10.0,16.0≤450 / stainless steel P1 .6-16.0≤200 nitric acid R // acetic class chrome-nickel titanium heat-resisting steel PI1.6-6.4≤550 petroleum, petroleum products Cr-Mo steel 1.6-16.0≤550 oil opening and closing pieces by medium flow and forces to open or close the valve to prevent the media back check valve called. Check valves are automatic valves, check valves agents, mainly used for one-way flow of media channels, only allowing media to flow in one direction, in order to prevent accidents. Check valve according to the structure can be divided into lift check valve, swing check valve and butterfly valve of three: 1 is divided into vertical and horizontal lift check valves. 2. Swing Check Valve into univalve, double valve type and Orange Peel three. 3. Butterfly valve is straight-through. Check specifications, Dingrui air conditioning (certification), the check valve is provided by wucheng Dingrui air-conditioning Limited. Wucheng Dingrui Air Conditioning Equipment Co., Ltd. (www.wcdrkt.com) (www.wcdrkt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness , the maximum meet customer needs. In Dingrui air conditioning leadership with the staff warmly welcome all inquiries negotiations to create Dingrui air conditioning better future.