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Online-maintained backflow preventer

A technology of backflow preventer and drain valve, which is applied in the direction of function valve type, multi-way valve, control valve, etc.

Active Publication Date: 2014-08-13
TIANJIN GUOWEI FEEDING & DRAINAGE EQUIP MENT MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the invention is to avoid the automatic opening of the drain valve when the water supply pressure fluctuates, reduce waste, and realize online maintenance

Method used

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Embodiment Construction

[0017] Specific embodiments of the invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The invention includes a housing, on which a water inlet, a water outlet and a water discharge are provided, and a water inlet valve 1, a water outlet valve 2 and a water discharge valve 3 are installed correspondingly, and the water inlet valve 1 includes a valve plate I11 and valve plate II12 seal the water inlet in two stages, the drain valve 3 is divided into an inner cavity 31 and an outer cavity 32 by a diaphragm, and the inner cavity 31 passes through the channel on the housing It communicates with the cavity between the valve plate I11 and the valve plate II12, and the outer cavity 32 communicates with the cavity inside the housing,

[0019] The drain valve 3 is fixed inside the housing, and the drain valve 3 includes a drain valve seat 33, a drain valve stem assembly 34 and a drain reset device, and the drain valve seat 33 is installed...

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Abstract

The invention provides an online-maintained backflow preventer. The online-maintained backflow preventer comprises a casing provided with a water inlet valve, a water outlet valve and a drain valve. The inside of the drain valve is divided into an inner cavity and an outer cavity through a diaphragm; the inner cavity is communicated with a cavity between a first valve plate and a second valve plate through a channel on the casing; the outer cavity is communicated with an internal cavity of the casing. The drain valve is fixed inside the casing, and a drain valve seat is mounted under the drain valve; one end of a drain valve stem component is movably mounted in the drain valve seat, and the other end of the drain valve stem component plugs a drain outlet through a drain valve plate; a drain resetting device is arranged on a drain valve stem which penetrates the diaphragm in the drain valve and is fixed with the same. The water inlet valve, the water outlet valve and the drain valve can be removed freely; the casing is provided with an access hole. The online-maintained backflow preventer has the advantages that water waste caused by draining due to unstable water pressure is avoided and online maintenance is achieved.

Description

technical field [0001] The invention belongs to the field of check valves, and in particular relates to an online maintenance backflow preventer. Background technique [0002] At present, the municipal water supply pressure is unstable, which causes the water inlet pressure of the backflow preventer to fluctuate. When the inlet pressure fluctuation value is greater than the opening pressure difference Δp of the drain valve of the backflow preventer, the drain port of the general anti-backflow structure will be opened. Reduce the intermediate pressure to meet the Δp value, so that the backflow preventer will intermittently discharge water during use (especially when the downstream of the backflow preventer does not use water), resulting in waste of water resources. This requires a structure that can prevent the intermittent opening of the drain valve when the water inlet pressure fluctuates during normal water supply, and can prevent the discharge valve from opening when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K15/18F16K17/22F16K11/22
CPCF16K11/22F16K15/18F16K17/22
Inventor 刘永刘庆龚高石刘杰
Owner TIANJIN GUOWEI FEEDING & DRAINAGE EQUIP MENT MFG
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