The shut-off valve is used on different types of pipelines, as well as on flow-through installations, plays the role of a shut-off device. When using it, you can perform many operations: cutting off the heater, for example, as well as removing the secondary heat transfer, if the valve is closed. The shut-off valve may well be used for preliminary balancing of the system. This type of valve works in two equally important positions - open or closed. Traditionally, it is installed on vertical and horizontal pipelines, where the working medium is guided under a plate. The shut-off valve is connected to the line usually by flange connection or welding.
This type of shutoff valves is usually recommended to be installed on highways, through which the process of transporting hot and cold water intended for technical purposes, air, water vapor. It is not recommended to use them for throttling, since aggressive liquids and gases can have a destructive effect on the valve.
The bellows-type shutoff valve has a limited life, due to the fact that the bellows is not designed for continuous operation. Such valves need regular inspection and maintenance. Bellows valves have proven their worth in systems involved in the transport of toxic media, vacuum and corrosive media. It is important to understand that in the event of a bellows failure, depressurization with a leak of the working medium is likely. If leakage of aggressive or toxic media occurs, it can become a threat to the ecological state of a certain area.
The diaphragm or hose type stop valve also has certain disadvantages. In this case, the occurrence of an unpleasant situation may be due to the failure of the rubber hose or membrane. If an electric drive is used, then its condition must be monitored throughout the entire operational period.
The flanged stop valve is connected to the tank or pipe by means of flanges. Its advantages include the possibility of repeated installation and dismantling on the pipeline, excellent sealing of joints, the convenience of their tightening, applicability for a wide range of pressures, great strength. The disadvantages are the loss of tightness due to the possibility of loosening the puff, large size and significant weight.
The coupling locking valve is designed to completely block the flow of the medium. They are usually used where tight shutoff of the flow and reliable operation are required.
Install the valve in a convenient location that is reasonably accessible for maintenance. For the convenience of controlling the flow rate of the medium or heat transfer of the coolant, the valve is equipped with a special handle.
In addition to industrial installations, this type of shutoff valves is actively used in water heating, heating and air conditioning systems.