网络优化资料：

Valve operating mechanism.

5. The opening and closing directions of the valve should be closed clockwise during operation.

4.2 Because the valves of the pipe network are often opened manually, the number of openings should not be too many, even for large-diameter valves, it should be between 200-600 revolutions.

4.3 In order to facilitate single-person operation, the maximum opening and closing moment should be 240 nanometers under the working pressure of the pipeline pneumatic solenoid valve.

4.4 The end of the valve to start and close should be round tenon, and be standardized, and face the ground, so that people can operate directly from the ground. Valves with turntables are not suitable for underground pipe networks.

5. The valve opening and closing degree display panel.

②The valve opening/closing degree scale line should be cast on the diaphragm solenoid valve gear cover or on the display case after changing the direction, and both should face the ground, and the scale line should be painted with phosphor to show eye-catching;

b If the material of the indicator disc needle is handled well, steel plate can be used, otherwise it is painted steel plate, and do not use aluminum skin;

The indicator disc needle is eye-catching and fixed firmly. Once the opening and closing adjustment is accurate, it should be fixed with rivets.

4.6 If the valve is buried too deep and the distance between the operating mechanism and the display panel is ≥1.5m from the ground, an extension rod device should be installed and fixed so that people can observe and operate from the ground. That is to say, the opening and closing operations of pipe network valves are not suitable for underground operations.