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Novel reverse flow preventing device

A backflow preventer, a new type of technology, applied in the direction of functional valve types, valve details, control valves, etc., can solve the problems that affect the system efficiency, cannot form an effective check, and the spring pressure is large, so as to achieve a small system water loss and one-way Good non-return effect and reasonable structure

Active Publication Date: 2008-12-17
WUHAN DAYU VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the valve is closed, the spring force is the smallest, and when the valve is fully open, the spring force is the largest, so when the flow rate of the system decreases, the valve is often in a half-open state under the action of the spring force; when the valve is checked, the valve is closed The spring force is the smallest when the valve is closed, so no effective check can be formed when the valve is closed; the spring pressure is the largest when the valve is fully open, which seriously affects the system efficiency

Method used

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Embodiment Construction

[0013] This embodiment is used to explain the claims of the present invention, and the protection scope of the present invention is not limited to the structures described below.

[0014] As shown in FIG. 1 , the first check valve 100 and the second check valve 200 are connected in series. Wherein, the middle valve body 5 is not only the rear valve body of the first check valve 100 but also the front valve body of the second check valve 200 . A drain valve 300 is connected to the valve body of the water outlet section of the first check valve 100 .

[0015] The structure of the first check valve 100 is shown in FIG. 4 : the valve body of the first check valve 100 is composed of the front valve body 1 and the middle valve body 5 connected by bolts 6 . A valve seat 19 is arranged inside the middle valve body 5 . The disc guide body 7 in the middle valve body 5 is provided with a guide hole 8 on the disc guide body 7 , and the diversion hole 9 is provided on the valve disc guid...

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Abstract

The invention discloses a novel backflow preventer. The preventer comprises at least two check valves which are communicated with each other and in series connection. A water escape valve is connected to and communicated with a valve body of the water exit section of the first check valve; the first check valve comprises the valve body; a valve seat is arranged on the inner wall of the valve body; a valve clack is arranged in the valve body and sealed with the valve seat; an elastic device is arranged on the valve clack; a movement constraint guide rail of the elastic device is arranged on the inner wall of the valve body; and the other end of the elastic device comes into contact with the movement constraint guide rail. The backflow preventer with the above structure can accurately sense the operating state of a system pipeline, and provide feedback when a backflow trend happens to a medium or a pipe explosion accident occurs before a valve, so as to preventing the medium from the backflow. By adopting the structure, the reached performance index exceeds the provision of the national standard CJ / T160-2002. The preventer can effectively prevent drinking water and other clean water from being polluted, and is suitable for occasions with strict requirements for water quality of drinking water systems and pipe systems.

Description

technical field [0001] The invention belongs to a hydraulic control combination device for one-way flow, and in particular relates to a novel backflow preventer. Background technique [0002] In order to prevent the backflow of sewage from the pipe guide in the water pipe network, two check valves connected in series are generally required to form a backflow preventer. The backflow preventer is mainly used in direct drinking water systems and occasions that have strict requirements on the water quality of the pipeline system. The head loss of the current backflow preventer is generally 0.7kg / cm 2 , the water head loss is relatively large, and the water supply pressure must be increased during normal water supply, which consumes a lot of energy. And this structure is more complicated. At the same time, the check of the current pipeline check valve is realized by the force of the spring. When the valve is closed, the spring force is the smallest, and when the valve is full...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K15/18F16K15/02F16K27/00F16K31/12
Inventor 李习洪梁碧华唐井来何锐
Owner WUHAN DAYU VALVE
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