The Standard of Water Flange Ball Valves Installation

1, the flange valve and piping flange surface should be no damage, scratches, etc., and keep clean. Especially when using metal washers (oval or octagonal cross-section), the flange of the groove and the gasket should be consistent, to be coated with red to carry out with the research to ensure that its sealed in good condition

2, the flange on the piping and piping centerline of the vertical and flange bolt hole error should be within the allowable value range. Valve and piping centerline to be consistent, and then install.

3, connecting the two flanges, the first flange to the flange and the gasket evenly pressed, thus ensuring the same bolt stress on the flange to connect.

4, in the fastening bolts, to use the nut to match the wrench, when using hydraulic, pneumatic tools for fastening, be careful not to exceed the specified torque.

5, the flange of the fast to avoid force uneven, should be in accordance with the symmetry, the direction of the order of tightening.

6, after the installation of the flange valves, to confirm all the bolts and nuts are strong and uniform.

7, bolts, nuts must be in line with the provisions of the material. After fastening, the bolt head should be exposed from the nut two pitch is appropriate.

8, bolts and spiral fastening, in order to prevent vibration caused by loose, to use the washer. In order to avoid high temperature screw adhesion, the installation of the threaded parts should be coated with anti-blocking agent (molybdenum disulfide).

9, for 300 degrees Celsius above the high temperature valve, after the temperature rise, must be flange connection bolts, bonnet fastening bolts, pressure sealing bolts and packing pressure bolts tighten again.

10, low temperature valve is installed at atmospheric temperature in the state. In the practical application, when the medium passes through to become a low temperature state, due to the formation of temperature difference, flanges, gaskets, bolts and nuts will shrink, and because these parts are not the same material, the coefficient of linear expansion is different Very easy to leak environmental conditions. From this objective situation, when tightening the bolts at atmospheric temperature, it is necessary to use moments that take into account the shrinkage factors of the components at low temperatures.

CMEC Valve,as a professional manufacturer of civilian valves, has always been commtting ourselves to provide best quality service to our worldwide customers.