Gate valve is a device thatIt is designed to work as a shut-off valve in various process lines. The mechanism is used on trunk pipelines to block the movement of dirty and slime waters, bulk materials, paper and cellulose media.
Devices are used in systemssewage, cleaning facilities, energy, pulp and paper, mining, food, chemical and other industries and utilities. The gate valve from other similar devices is distinguished by the design of the locking element.
In this type of device is useda metal plate or a wedge that are capable of cutting inclusions in liquids flowing inside the valve. Shut-off valves are used to completely block the flow of any medium in the pipeline.
Gate valve knife can be installed withvertically located spindle, flywheel up only on horizontal pipelines. Each shut-off valve can be either completely closed or in an open state. It is inadmissible to use locking devices for throttling (incomplete closure or opening).
Sliding gate valve with electric drive allowsmechanize the operation of the device. It is used to maintain flows with a low pressure drop. Devices allow you to block access to equipment and have dimensions from 10 mm to 2.7 meters. Throttle devices have large dimensions.
The shut-off valve consists of a steering wheel and a disk,which is controlled by a spiral rod moving at right angles to the flow up or down. In the closed position, the disc for closing the flow rests against two surfaces. To seal the liquid in the pipes and to prevent leaks, an oil seal is used, which comes complete with sealing materials.
Despite the breadth of application, slide gatenot always able to perform the task. At low pressures, the device does not have enough force to seal the system, in such cases, lubricated taps or wedge valves are installed.
Shut-off valves depending on the environmentuse is made of various materials. Gate valve, designed for operation in catalytic ducts, is made of low-alloy or stainless steel. With aggressive conditions and significant pressure drops, the use of a vibro-sealing lining and the rejection of the use of austenitic steels are associated.
During the washing of water by pipelines, massLatches can give a small leak in the gaskets. However, they should not be tightened, since the devices are not designed to work with water, and it is possible to check their tightness only in conditions of denser flows.
Devices with electric or hydraulic drive are usually used in the work of technological piping of pumping stations, systems designed to receive and start separators.
