Instrument needle valve construction and installation points

Instrument needle valve construction and installation points
1), the installation position, altitude, direction and export must meet the Instrument valves design requirements, pay attention to the direction of media flow valve should be consistent with the direction of the arrow mark, the connection should be firmly tight.
2), must be visually inspected prior to valve installation, the needle valve plate should be consistent with the provisions of GB 12220 of the existing national standards, "Universal Valve logo." For working pressure greater than 1.0 MPa and the role played off valve on the main pipe, the installation should be carried out before the strength and rigorous performance tests, passing behind the prospective use. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5min, the valve housing, packing should be no leakage in compliance.