The valve is normally closed clockwise and opened counterclockwise, that is, close the valve in the direction of the arrow pointing to S, and open the valve in the direction of the arrow pointing to O. Where s represents shut=off and o represents open=on. If there is a handwheel, it is open by rotating it toward the thumb of the right hand, and closed by rotating it toward the thumb of the right hand.

The valve is a control component in the fluid delivery system, which has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest globe valves to various valves used in extremely complex automatic control systems.

The valve can be used to control the flow of various fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

Regulating valve

The pressure difference between the front and back of the valve is fixed. When the opening of an ordinary valve changes in a large range, its flow changes little. When it reaches a certain opening, the flow changes sharply, which means poor regulation performance. The regulating valve can change the resistance number of the valve by changing the stroke of the valve element according to the direction and size of the signal, so as to achieve the purpose of regulating the flow.

Daily maintenance

The valve shall be stored in a dry and ventilated room and blocked at both ends of the passage.

The valve shall be inspected regularly, and the dirt on it shall be removed, and the anti rust oil shall be coated on its surface.

The valve after installation and application shall be regularly overhauled to ensure its normal operation.

Check whether the sealing surface of the valve is worn, and repair or replace it as appropriate.