Gate valves are a well-known type of shut-off valves. They are intended for use on pipelines of housing and communal services, oil and gas and water mains with a diameter of 15 to 2000 millimeters. In addition, valves are used at production facilities, in whose systems the operating pressure does not exceed 25 MPa, and the temperature is up to 565 ° C.
Gate valves are pipeline valves, shut-off or control valves, which perform a reciprocating movement along the sealing surfaces of the body and perpendicular to the direction of flow of the working medium. Due to their simplicity of design and the possibility of using them in various fields, gate valves are a widespread device. And their low hydraulic resistance made them indispensable in systems designed for high-speed movement.
If we present the design in a simplified way, the body and the cover of the valve form a space that fills the working medium under working pressure. There is a shutter inside. It carries out movement perpendicular to the axis of the medium passage in the body, thanks to the work of the spindle or stem. The ends of the body provide a connection between the valve and the pipeline.
Basically, valve bodies are cast from cast iron and aluminum alloy. Valves made of steel and even titanium alloys are also used. The main advantage of cast iron valves is high strength, durability and reliability in operation. Gate valves 30h39r , 30chb9r, 30h6br , 30h930br and others are distinguished by simple design, easy shutter operation and long service life.
The most widely used shut-off valves are used to shut off the flow of the medium. The locking element works in the "open" or "closed" position. Shut-off valves are used to check the level of the medium in tanks, air release, drainage and others. Most often, the gate valve is controlled using a handwheel (manually), as well as using an electric drive and a hydraulic drive. Manual valves with large diameters use gearboxes to reduce the force required to open or close.
The control valves provide certain parameters of the working medium, namely, it sets the flow rate of the medium, set pressure, mixing proportions, liquid level and some others. The operation is carried out by changing the flow through the flow area. In various conditions, it is advisable to use certain types of control of control valves, such as external energy sources, automatic control and using sensors.
