Pneumatic valve flange connection points for attention

about flange connection pneumatic valve installation method introduced
. Pneumatic valves and piping flange surface should be no damage, scratches, etc, and kept clean. Especially when using metal gasket, flange cutting should be in conformity with the washer, have to be running-in coated with red lead, to ensure its seal in good condition.
. Piping on the piping flange surface and the center line of the vertical degree and the error of the flange bolt hole should be in the range of allowable values. After the center line of the pneumatic valves and piping to agree, during installation.

. Two flange connection, the first to make the flange sealing surface and the gasket uniform compression, thus guarantees by equal stress of flange bolt connection.

. When the bolt, to use match the nut wrench, when using the hydraulic, pneumatic tool for fastening, be careful not to exceed the prescribed torque.

. Flange tightening to avoid uneven force, should according to symmetry, tighten hand in righteousness in the direction of the order.

. Flange after installation, make sure all the bolt and nut fastening evenly.

. The material of bolts and nuts must conform to the rules. After fastening bolt head should be show two pitch from the nut is advisable.

. Bolt and nut fastening, in order to prevent vibration caused by loose, to use the washer. To avoid adhesion between the high temperature when the thread, the thread parts when installation should besmear anti-sticking agent.

. For high temperature pneumatic valve ℃ and above, after the temperature rise, must to flange bolt fastening bolt, pneumatic valve cover, pressure sealing and packing gland bolts tightening again.

. Cryogenic pneumatic valve when the installation is under a state of atmospheric temperature, due to the formation temperature, flanges, gaskets, bolts and nuts, such as contract, and as a result of the material of these parts are not identical, the linear expansion coefficient of each different, formed a very easy to leak environmental conditions. Starting from the objective conditions, the bolt at atmospheric temperature, considering the low temperature must be used when the shrinkage factor of torque components.