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The application of check valve in hot water heating system is discussed

Updated: 2017年07月16日

A check valve is a valve used to prevent the flow of medium in a pipe or device. It starts with the kinetic energy of the fluid. In the heating system, the check valve is usually installed in the outlet of the pump and other places where the flow of the fluid is not allowed to flow back.The selection of appropriate check valves has a great impact on water hammer protection. For example, a large number of water hammer accidents in the pump station are related to the check valves installed in the pump outlet. Accident after stopping the pump flow by Beijing began to flow back, under the action of discharge water, quickly close check valve, if the check because of a malfunction or bearing friction and inertia influence, the check valve is likely to lag behind back in time to start, namely in the flow increased to a certain value, even in the largest flow closed instantly, can the check place very big pressure.

The check valve disc closes at a rate of zero and is the optimal state to close. It is not possible to complete the disc closing at zero velocity. Generally, it is normal to close off the zero traffic area.In hot water heating system, in order to reduce the accident stop pump water hammer, the relief valve of the belt check valve can be set between the pressure pipe of circulating pump and suction pipe. When circulating pump operation, the check valve is closed due to water pressure above the suction side of the pump outlet.

When a sudden stop pump, pump water to the lateral pressure sharply reduced, the suction side pressure is greatly increased, under the effect of the pressure difference, the circulating pump the water in the suction side line is opened the check valve to pump the water side of the pipe network system, which reduces the water absorption increased lateral pressure of pipe networks range; Reducing and preventing water hammer damage.The check valve installed on the relief bypass should be selected with less resistance and open flexible products. The larger the tube diameter of the relief bypass tube, the stronger the reduction of the water hammer can be. According to the specified pressure limit, the pipe diameter of the economy can be determined through the transient calculation.

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