What are the operating instructions for manual valves?

The manual valve is a valve operated by the handle and the hand wheel, and is a commonly used valve on the equipment pipeline. Its handle and handwheel rotate clockwise to close and counterclockwise to open. However, there are also individual valves that open the opposite of the above. Therefore, before operation, you should pay attention to check the opening and closing signs before operating.
    The handwheel and handle on the valve are designed according to normal manpower. Therefore, the use of the valve does not allow the operator to open or close the valve by means of a lever and a long wrench. The handwheel and handle diameter (length) <320mm, only allow for personal operation, handwheels >320mm in diameter, allowing two people to work together, or allowing one to operate the valve with the appropriate lever (generally no more than 0.5m long). However, diaphragm valves, pinch valves, and non-metallic valves are strictly prohibited to operate with levers or long wrenches, and it is not allowed to close the valve too much.

    Valves such as gate valves and globe valves, such as closing or opening to the head (ie, bottom dead center or top dead center), should be rotated 1/4 to 1/2 turn to make the thread better fit, which is advantageous for operation, so as not to be too tight. Damage to the valve.

    Some operators are accustomed to using levers and long wrenches. It is considered that the greater the closing force, the better. This can cause premature failure of the valve and even cause an accident.