1. The opening and closing direction of the pneumatic valve should always be closed clockwise.
2. Since the pneumatic valves in the pipe network are often opened and closed manually, the opening and closing revolutions should not be too many, even large-diameter valves should be within 200-600 revolutions.
3. In order to facilitate the opening and closing operation of one person, the opening and closing torque should be 240N-m under the condition of pipeline work pressure.
4. The opening and closing operation end of the pneumatic valve should be a square tenon with standardized dimensions and face the ground, so that people can directly operate it from the ground.
6. If the pneumatic valve is buried deep, and the distance between the operating mechanism and the display panel is ≥1.5m from the ground, there should be a long pole facility, and it should be fixed firmly so that people can observe and operate from the ground. That is to say, the valve opening and closing operation in the pipeline network is not suitable for downhole operation.
Performance check:
1. When a valve is manufactured in batches of a certain specification, an agency should be entrusted to carry out the following performance tests:
(1) The opening and closing torque of the valve under working pressure conditions.
(2) Under the condition of working pressure, the continuous opening and closing times of the valve can be guaranteed to be tightly closed.
(3) Detection of the flow resistance coefficient of the valve under the condition of pipeline water delivery.
2. Pneumatic valves should be tested before leaving the factory:
(1) When the valve is open, the valve body should withstand the internal pressure detection of the valve working pressure value.
(2) In the closed state of the valve, the two sides are respectively subjected to the valve working pressure value, and there is no leakage; but the leakage value of the metal-sealed butterfly valve is not greater than the relevant requirements.
