Self-reliance type automatic recirculating pump protecting valve

Abstract

The invention relates to a self-reliance type automatic recirculating pump protecting valve which comprises a valve body, a valve cover, a spring, a check valve clack, a valve element and a bypass flange. The valve body is provided with a main flow channel inlet, a main flow channel outlet and an assembling opening. The valve cover is in sealing connection with the assembling opening. One end of the spring is connected with the inner side of the valve cover. The check valve clack is provided with a bypass flow channel. The valve element comprises a stroke section and a bypass section. The bypass flange is provided with a bypass flow channel outlet. The other end of the spring is connected with the check valve clack which is provided with a pressure reducing opening. The stroke section of the valve element is placed in the bypass flow channel. The bypass section of the valve element is provided with a bypass water channel and at least one throttling opening. The valve body is further provided with a bypass assembling opening which is in sealing connection with the bypass flange. The pressure reducing opening, the throttling opening, the bypass water channel and the bypass flow channel outlet are communicated in sequence. The self-reliance type automatic recirculating pump protecting valve is compact in structure, a power supply and control signals do not need to be added, an actuator is avoided, automatic operation can be carried out, mounting is convenient, on-line maintaining can be carried out, and maintaining is convenient.

Description

technical field [0001] The invention relates to a valve, in particular to a self-operated automatic recirculation pump protection valve used in an automatic recirculation pump protection system in a liquid delivery system. Background technique [0002] Recirculation pump protection valve, also known as empty check valve and minimum flow valve, is a special valve suitable for the recirculation system of the feed water pump. It is usually installed at the outlet of the feed water pump and is widely used in industrial fields such as power plants, steel mills and chemical plants. . [0003] Especially in industrial fields such as thermal power plants, steel mills, and chemical plants, boiler feed pumps are used more often. As important auxiliary machines, they are directly related to the safe and economical operation of factories. In addition to the reasonable structure, strict manufacturing process and excellent material of the feed water pump, its anti-cavitation performance ...

AI Technical Summary

Problems solved by technology

[0005] The existing recirculation system needs to have the following functions: flow measurement, check valve, pressure relief and flow regulation, so the entire recirculation system includes flow meter, control loop, minimum flow regulating valve, electric (or pneumatic) execution Mechanisms, check valves and other mechanisms require manual adjustment during use, additional power supply and control signals and other actuators, and additional power supply, which is not only complicated to operate, but also very inconvenient to install and maintain

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