Operation Specification for Connection Installation of Flange and Valve
Classification:
Release Time：2019-10-21
1. Flange faces of valves and piping shall be free from damage, scratches, etc. and kept clean. Especially when using metal gasket, flange groove and gasket should match, to ensure that the sealing condition is good
2. The verticality between the flange surface on the pipe and the center line of the pipe and the error of the flange bolt hole should be within the allowable range. The valve and the pipe center line shall be consistent before installation.
3. When connecting two flanges, first make the flange sealing surface and gasket evenly compressed, thus ensuring the flange connection with the same bolt stress.
4. When tightening bolts, use a wrench that matches the nut. When using oil pressure and pneumatic tools for tightening, be careful not to exceed the specified torque.
5, flange fastening to avoid uneven force, should be in accordance with the symmetrical, cross-meaning direction of the order of tightening.
6. After the flange is installed, confirm that all bolts and nuts are firm and uniform.
7. The material of bolts and nuts must meet the requirements. After tightening, the bolt head should be exposed from the nut for two pitches.
8, bolts and spiral fastening, in order to prevent vibration caused by loose, to use the washer. In order to avoid adhesion between threads at high temperature, anti-sticking agent should be applied to the thread during installation.
9, used300For high-temperature valves above the temperature, the flange connecting bolts, valve cover fastening bolts, pressure seal bolts and packing cover bolts must be tightened again after the temperature rises.
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