Backflow preventer

A technology of backflow preventer and flow channel wall, which is applied in the direction of valve details, control valves, function valve types, etc., can solve problems such as inability to form effective checks, inability to realize online maintenance, and affect system efficiency, so as to ensure stability, Low manufacturing cost, simple installation and maintenance

Active Publication Date: 2009-12-30
WUHAN DAYU VALVE
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  • Abstract
  • Description
  • Claims
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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

Method used

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Embodiment Construction

[0014] This embodiment is used to explain the claims of the invention, and the protection scope of the invention is not limited to the structures described below. Those skilled in the art make structural changes different from the following in the technical solution of the present invention, all of which belong to the protection scope of the present invention.

[0015] Such as figure 1 As shown, the water inlet end and the water outlet end of the valve body 100 are respectively connected with valves 300 and 400 for maintenance. When online maintenance is required, the maintenance valves 300 and 400 can be closed.

[0016] The upper part of the valve body 100 is provided with a maintenance hole 101 , and the lower part is provided with a drain port 102 . The valve body 100 at the inspection hole 101 is connected to the valve cover 200 , and the drain port 102 is connected to the leaking funnel 103 . Detachable check valve assemblies 301 and 302 are respectively arranged in t...

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Abstract

The invention discloses a backflow preventer, comprising a valve body, the valve body is opened with overhaul holes, the overhaul holes are connected with a valve cover, the valve bodies at the two sides of the overhaul holes are internally provided with demountable check valve components, and a water escape valve is arranged between the two check valve components. The backflow preventer of the invention adopts arranging two demountable check components at two ends of a single valve body or a combined valve body, as well as arranging overhaul holes and valve covers at upper part of the valve bodies, thus realizing on-line overhaul, namely, taking out the check valve components for replacement or repairing conveniently after opening the valve covers.

Description

technical field [0001] The invention belongs to a pipe network control valve, in particular to a 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 fully open, the spring force is the largest, so w...

Claims

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Application Information

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IPC IPC(8): F16K15/18F16K27/00
Inventor 李习洪何锐
Owner WUHAN DAYU VALVE
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