To prevent the opposite flow of a certain medium in the pipeline, a check valve was invented, the working disk of which rotates around its own axis. Usually it is installed directly after the pumping equipment, providing protection against water hammer. This type of device is used more widely than other analogues of check valves. It is understood that in the reverse flow of the working medium, a special plug is lowered under the influence of its own mass. Rotary check valves can be made of cast iron, steel, brass, titanium and some other materials that have suitable properties.
Depending on the type of connection,
a flanged check valve is widely used
, which is installed on the pipeline using mating elements and special fasteners. During manufacture, this type of product is tested for durability and tightness. Steel products can be made in four versions, since there are various grades of alloys. The desired performance is selected based on the aggressiveness of the working environment and operating conditions.
Water often acts as a working medium, therefore, a check valve is required in most cases to control the flow of liquid in order to pass or block the channel. Such a device is primarily intended for pressure piping systems. It is able to work both in ordinary conditions and in all kinds of emergency situations. In this regard, it can be used even for industrial purposes. The principle of operation of the device is to exclude the possibility of water flow in the opposite direction, as this can lead to negative consequences.
As a rule, a check valve for water is installed between the
water meter assembly and the filter. That is, in any case, it should be after the counter. It is recommended to mount it with the control plug down to ensure the best conditions for drainage. It is believed that the rotary mechanism is most convenient, because products with such a device can be installed on almost any pipe. A wide range of sizes allows you to do this without any problems.
Most often, the check valve is mounted on the horizontal parts of the pipes, but it is quite realistic to install it on vertical pipelines. Unlike other types, it tolerates contaminated water much better. The structure of this device includes several elements: body, cover, shutter, seat and stem with a flywheel. On the one hand there is a special hole in the housing into which fluid enters. After the water enters, the stem moves the shutter, closing or opening the seat hole. Passing it, the liquid exits from the other side. Installation of check valves is carried out taking into account the direction of fluid movement. The device should be easily accessible for maintenance.