Valve is an important control component in fluid transportation systems. It is used to open and close pipelines, control flow direction, and adjust and control parameters (such as temperature, pressure, and flow rate) of the conveyed medium. According to its functions, valves can be divided into shut-off valves, check valves, control valves, etc. The following are some common types of valves and their working principles:

Gate Valve: The opening and closing part of a gate valve is the gate. The movement direction of the gate is perpendicular to the fluid direction. A gate valve can only be fully opened or fully closed and cannot be used for regulation and throttling. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the sealing surface will be surfacing welded with metal materials to increase wear resistance.

Globe Valve: The globe valve relies on the pressure of the valve stem to make the sealing surface of the disc closely fit with the sealing surface of the valve seat to block the flow of medium. Globe valves are suitable for on/off and throttling applications. Two-way globe valves are used for precise flow control, and three-way globe valves are used for mixing media from two inlets.

Ball Valve: The opening and closing part of a ball valve is a sphere. The sphere rotates around the axis of the valve stem. The ball valve is easy to switch, has a small volume, can be made into a large diameter, has reliable sealing, a simple structure, and is convenient for maintenance.

Butterfly Valve: The opening and closing part of a butterfly valve is a disc that rotates around the valve shaft to achieve opening and closing. The butterfly valve is characterized by lightness, simple structure, rapid opening and closing, and low fluid resistance. It is suitable for occasions that require frequent operation and good adjustability.

Check Valve: The check valve is used to prevent the medium from flowing back. When the medium flows in the forward direction, the valve disc opens; when the medium flows in the reverse direction, the valve disc closes to prevent the medium from flowing back.

Control Valve: The control valve is used to adjust the pressure or flow rate of the medium. The pressure reducing valve reduces the inlet pressure to a required outlet pressure through adjustment, and the outlet pressure is automatically kept stable by relying on the energy of the medium itself.

Solenoid Valve: The solenoid valve is based on magnetic force or a coil. When energized, the solenoid valve coil generates electromagnetic force, lifts the closing key to open the valve; when de-energized, the electromagnetic force disappears, and the closing key presses on the valve seat to close the valve.