Classification of shut-off valves
Modern pipelines are complex systems consisting of various nodes. The reliability and efficiency of engineering networks largely depends on properly selected shut-off valves.
Definition and application
Shut-off valves are understood as devices by which the flow of the transported medium can be controlled. We are talking about hermetic blocking, changing the flow rate, adjusting its direction, etc. Most often, the working medium is understood as water, gas or petroleum products.
By means of shut-off elements, the internal lumen of pipes of various cross-sections is changed. The position of the blocking elements can be closed, open or intermediate.
Varieties
The assortment of shut-off valves consists of the following items:
- Rotary valves. For the manufacture of these compact elements, steel and special alloys are used. In the closed position, the cut-off part of the line is completely sealed. Also, the valves can be placed in intermediate positions. Fittings of this type are characterized by simplicity of design, efficiency and convenience in operation.
- Cranes. They are presented in a wide variety of configurations and devices. They can be spherical, cylindrical, conical. The purpose of cranes is to block the movement of the transported medium by means of a rotating plug.
- Latches. The most common type of shut-off valves, widely used in the housing and communal services. High-quality valves are able to reliably block the movement of substances through pipes. Products of this type are steel, cast iron and alloy.
- Shut-off valves. In order to avoid the reverse movement of gaseous or liquid compositions through the pipes, special shut-off valves are used. They can be flanged, bypass, balancing, reverse, ball, coupling, with one or two flaps. Automatic actuation of the fuse occurs in case of reverse movement or pressure surge in the system.
- Valves. By means of valves in the pipeline, optimal pressure can be created. It is achieved by completely or partially blocking the flow.