Pneumatic valve operation method
1. The opening and closing direction of pneumatic valve operation should always be clockwise. .
2. Since the pneumatic valves in the pipeline network are often opened and closed manually, the number of 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 by one person, the maximum opening and closing torque should be 240N-m under plumber's pressure.
4. The opening and closing operating end of the pneumatic valve should be square tenon, standardized in size, and facing the ground so that people can operate it directly from the ground. Valves with discs are not suitable for use in underground pipe networks.
5. Display panel for the degree of opening and closing of the pneumatic valve:
6. ① The scale line for the degree of opening and closing of the pneumatic valve should be cast on the gearbox cover or displayed after the direction is changed. The outer casing of the dial should always face the ground, and the scale lines should be painted with fluorescent powder to make them eye-catching;② The material of the indicating dial needle can be a stainless steel plate if the management is good, otherwise it will be a painted steel plate, and do not use aluminum skin. ;③ The indicator needle is eye-catching and firmly fixed. Once the opening and closing adjustment is accurate, it should be locked with rivets.
7. If the pneumatic valve is buried deeply and the operating mechanism and display panel are ≥1.5m away from the ground, extension rod facilities should be provided and firmly fixed to facilitate people's observation and operation from the ground. In other words, the opening and closing operations of valves in the pipeline network are not suitable for downhole operations.
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