Stainless steel backflow prevention device with double non-return valves

Abstract

The invention discloses a stainless steel backflow prevention device with double non-return valves. The backflow prevention device is mainly composed of a valve body, a valve cover, the water inlet non-return valve, the water outlet non-return valve, a hydraulic control water draining valve and a communication tube and is characterized in that the water inlet non-return valve and the water outlet non-return valve are located at the two ends of the valve body respectively, and the hydraulic control water draining valve is arranged at the position, between the water inlet non-return valve and the water outlet non-return valve, of the valve body; the valve cover is fixedly mounted on the upper portion of the valve body through a bolt; the water inlet non-return valve comprises a valve clack, a valve rod, a spring, a guide seat and a valve seat, and the water outlet non-return valve also comprises a valve rod, a valve clack, a valve seat, a spring and a guide seat; and the communication tube is arranged on the top of the valve cover to be communicated with the water inlet non-return valve and is connected in front of the valve clack of the water inlet non-return valve. The stainless steel backflow prevention device has the beneficial effects that the backflow prevention device has the advantages of being simple in structure, convenient to mount, small in size, light, long in service life and the like, the motion is sensitive, the backflow prevention performance is good, and the device is sanitary and free of pollution.

Description

technical field [0001] The invention relates to a backflow preventer, in particular to a double check valve stainless steel backflow preventer. Background technique [0002] The backflow preventer is a hydraulic control device that strictly limits the pressure water in the pipeline to flow in one direction only. At present, most of the backflow preventers on the market use carbon steel casting valve bodies, which are bulky and heavy, which is not conducive to installation. Contents of the invention [0003] The object of the present invention is to provide a double check valve stainless steel backflow preventer with small volume, light weight and no water pollution. [0004] The technical solution adopted by the present invention to solve the technical problem is: the double check valve stainless steel backflow preventer is mainly composed of a valve body, a valve cover, a water inlet check valve, a water outlet check valve, a hydraulic control drain valve and a connectin...

AI Technical Summary

Problems solved by technology

At present, most of the backflow preventers on the market are made of carbon steel casting valve body, which is large in size and heavy in weight, which is not conducive to installation.

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