Technical requirements for valve operating mechanism and opening/closing display panel

Valve operating mechanism

1. The opening and closing direction of the valve during operation should always be clockwise.

2. Due to the frequent manual opening and closing of valves in the pipeline network, the opening and closing speed should not be too high, even for large-diameter valves, it should be within 200-600 revolutions.

3. For the convenience of one person's opening and closing operation, the maximum opening and closing torque under pipeline pressure conditions should be 240m-m.

4. The valve opening and closing operation end should be square tenon, standardized in size, and facing the ground, so that people can directly operate it from the ground. Valves with discs are not suitable for underground pipelines.

5. If the valve is buried deep and the distance between the operating mechanism and the display panel and the ground is ≥ 15m, an extension rod facility should be installed and firmly fixed for people to observe and operate from the ground. That is to say, the opening and closing of valves in the pipeline network is not suitable for underground operations.

Display panel for valve opening and closing degree:

1. The scale line for the degree of valve opening and closing should be cast on the gearbox cover or the outer shell of the display panel after changing direction, all facing the ground. The scale line should be brushed with fluorescent powder to indicate visibility.

2. The material of the indicator disk needle can be made of stainless steel plate under good management, otherwise it is painted steel plate and aluminum sheet should not be used.

3. The indicator pin should be conspicuous and securely fixed. Once the opening and closing adjustment is accurate, it should be locked with rivets.