The valve according to the different types of nominal pressure classification

According to the nominal pressure valve can be divided into the following categories: ( 1) Vacuum valve: refers to the working pressure is lower than the standard atmospheric pressure of the valve. ( 2) Low pressure valve: refers to the nominal pressure PN & le; 1. 6 mpa. ( 3) Medium pressure valve: refers to the nominal pressure PN to 2. 5Mpa、4. 0Mpa、6. 4 mpa. ( 4) High pressure valve: refers to the worker called pressure PN 10. 0Mpa～80. 0 mpa. ( 5) Ultrahigh pressure valve: refers to the nominal pressure PN≥ 100. 0 mpa. ( 6) Filter: refers to the nominal pressure PN is 1. 0 mpa, 1。 6 mpa