1. Domestic standard Nominal pressure Mpa mainly as a pressure valve unit, generally universal valve points 1.0Mpa /1.6Mpa/2.5Mpa/4.0Mpa/6.4Mpa/10.0Mpa/16.0Mpa/32.0Mpa. And a few other special industries with non-standard pressure
2. American standard valve nominal pressure standard to pound Class : general normal specifications use the following levels 150BL/300BL/400BL/600BL/900BL/1500BL/2500BL and so on.
3. Other valve standards: marine valves, Japanese standard valves, German standard valves, etc.