Operating mechanism of pneumatic check valve
Classification:
Release Time：2018-03-08
1. The opening and closing direction of pneumatic valve operation shall be closed clockwise. 2, due to the pneumatic valve in the pipe network, often manual opening and closing, opening and closing the number of revolutions should not be too much, is the large diameter valve should also be within 200-600 turns. 3, in order to facilitate a person's opening and closing operation, under the condition of plumber pressure, a large opening and closing torque should be 240N-m. 4, pneumatic valve opening and closing operation end should be square tenon, and the size of standardization, and facing the ground, so that people can directly operate from the ground. The valve with wheel disc is not suitable for underground pipe network. Pneumatic check valve performance testing 1, the valve a specification of batch manufacturing, should be entrusted to the authority
1. The opening and closing direction of pneumatic valve operation shall be closed clockwise.
2, due to the pneumatic valve in the pipe network, often manual opening and closing, opening and closing the number of revolutions should not be too much, is the large diameter valve should also be in200-600Turn inside.
3, in order to facilitate a person's opening and closing operation, under the condition of plumber pressure, a large opening and closing torque should be240N-m.
4, pneumatic valve opening and closing operation end should be square tenon, and the size of standardization, and facing the ground, so that people can directly operate from the ground. The valve with wheel disc is not suitable for underground pipe network.
Performance Test of Pneumatic Check Valve
1. When a certain specification of the valve is manufactured in batch, the authoritative organization shall be entrusted to carry out the following performance testing:
① The opening and closing torque of the valve under working pressure;
② Under the condition of working pressure, the number of continuous opening and closing can ensure that the valve is closed tightly;
③ detection of the flow resistance coefficient of the valve under the condition of pipeline water transmission.
2. The following tests shall be carried out before the valve leaves the factory:
When the valve is opened, the valve body shall bear the internal pressure test twice the valve working pressure value;
② When the valve is closed, both sides bear1.1Double the valve pressure value, no leakage; but the metal seal butterfly valve, leakage value is not greater than the relevant requirements.
Internal and external corrosion protection of pneumatic check valve
1. Inside and outside the valve body (including the variable speed transmission box), shot blasting sand removal should be carried out first, and efforts should be made to electrostatically spray powdery non-toxic epoxy resin with a thickness of up0.3mmAbove. When it is difficult to electrostatically spray non-toxic epoxy resin on large valves, it should also be brushed and sprayed with similar non-toxic epoxy paint.
2, the valve body and valve plate inside the various parts of the requirements of comprehensive anti-corrosion, on the one hand, soaked in water will not rust, between the two metals do not produce electrochemical corrosion; two aspects of smooth surface to reduce the resistance to water.
3. The hygienic requirements for anti-corrosion epoxy resin or paint in the valve body shall be subject to the inspection report of the corresponding authority. The chemical and physical properties shall also meet the relevant requirements.
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2026/02/28
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