Manual valve, is through the valve handle, hand wheel operation, is one of the types of equipment to use the common pipe valve. Its handle, the handwheel clockwise rotation direction is closed, counterclockwise to open it. But there are also individual Industrial Valves opens and the open instead. Therefore, before the operation should pay attention to check the opening and closing again after operation. The handwheel, handle on the valve is designed according to the normal human, therefore, on the valve use regulations, does not allow the operator with the lever and long wrench open or close the Industrial Valves. The handwheel, the diameter of the handle ( Length) < Diameter of 320 mm, allows individuals to operate only, & gt; 320 mm wheel, allowing two people common operation, or allowing a person with the appropriate lever ( 5 m in length) operation. But the diaphragm valve, clip pipe valve, non-metallic valves are levers or long wrench operation, is strictly prohibited conduct does not allow, close the valve. Gate and globe valves, such as closed or open end ( The bottom dead center or the top dead center) Turn 1/4 to 1/2 turn, make the thread a better seal, good operation, in order to avoid the & # 353; Too tight, the damage to the valve. Some operators used to use leverage and long wrench operation, think that the bigger the closing force, the better, it's not. This will cause premature valve damage, and even lead to accidents.
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