Standard for pneumatic knife gate valves
The pressure of the axial check valve- temperature grade of shell material is in accordance with GB9131.
The structural length and limit deviation of the valve body shall be specified in GB/T 15188.2
Flange connection size and sealing surface type of special requirements in the order.
Stem and stem nut with trapezoidal thread, basic dimensions and tolerances as per GB 5796.1 ~ 5796.4.
The connecting size of bracket and driving device shall be in accordance with GB 12222.
The cast steel knife gate valve body is made of WCB material according to GB12229.
The gate is made of austenitic stainless steel (SS304) according to GB 12220 and GB4237.
The valve stem is made of 1Cr13 and 2Cr13 material according to GB12220.
Bracket and packing gland are made of carbon steel (WCB) according to GB12229.
Stem nut shall be of copper alloy (ZCuZn38Mn2Pb2, ZCuSn5Pb5Zn5) as per GB 12225.
Top seal (packing) using graphite asbestos rope.
Shell test and seal test of the pneumatic knife gate valve China are in accordance with GB/T 13927.
For effective sealing performance requirements, the leakage of sealing test is calculated as 1 mm/s.
Gas gate valves shall be cleaned in accordance with JB/T 7748.
Paint color according to JB 106.
The packaging, storage, transportation and quality assurance of gas gate valves shall be in accordance with JB/T 7928.
Casing pressure of the stainless steel pneumatic knife gate valve: 1.5 MPa, sealing pressure: 1.1 pressure, applicable temperature: 425 ℃, the suitable medium: water, gas, paper pulp, etc.