What is the working principle of pneumatic valve?

The working principle of pneumatic valve is that pneumatic control valve is composed of actuator and adjusting mechanism. The actuator is the thrust component of the regulating valve, which generates corresponding thrust according to the pressure of the control signal to push the regulating mechanism to move. The valve body is the regulating part of the pneumatic regulating valve, which is in direct contact with the regulating medium to regulate the flow of fluid.

General requirements:

1. The specifications and categories of pneumatic valves shall meet the requirements of pipeline design documents.

2. The model of pneumatic valve should indicate the requirements of national standard number. If it is an enterprise standard, it shall indicate the relevant description of the model.

3. The working pressure of pneumatic valve should be equal to or higher than the pressure of pipeline. Under the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline; When the pneumatic valve is closed, either side should be able to withstand the valve working pressure of 1. 1 times without leakage; When the valve is open, the valve body should be able to withstand twice the working pressure of the valve.

4, pneumatic valve manufacturing standards, should explain the national standard number, if it is an enterprise standard, the procurement contract should be attached to the enterprise documents. Pneumatic valve standards are divided into national standard, American standard and Japanese standard.

5. The complete description of pneumatic valve includes its specification, material, connection mode and action mode (including 1: double action and 2: single action).

Extended data

Inside and outside the valve body (including the variable speed transmission box), firstly, shot blasting should be carried out to remove sand and rust, and powder nontoxic epoxy resin with a thickness of more than 0.3mm should be electrostatically sprayed ... When it is difficult to electrostatically spray nontoxic epoxy resin on oversized valves, similar nontoxic epoxy paint should also be painted.

All parts inside the valve body and the valve plate are required to be completely anticorrosion. On the one hand, immersion in water will not rust, and electrochemical corrosion will not occur between the two metals. On the other hand, the smooth surface reduces the resistance of water.

Hygienic requirements for anticorrosive epoxy resin or paint in valve body shall provide inspection reports of corresponding institutions. Chemical and physical properties should also meet the relevant requirements.

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