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One-way rotary plug valve

A plug valve and functional technology, applied in the field of plug valves, can solve the problems of cumbersome assembly, maintenance and inspection operations, large size, complex structure, etc., and achieve the effect of size reduction, performance improvement, and good actual effect

Inactive Publication Date: 2005-05-11
KANE KOUGYOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is necessary to combine these two valve mechanisms, namely, the plug valve and the check valve, the following problems arise: the resulting structure inevitably becomes very complicated and has a very large size, and its assembly, maintenance, and inspection operations very cumbersome

Method used

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  • One-way rotary plug valve
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Embodiment Construction

[0014] Hereinafter, embodiments of the present invention are described based on the drawings.

[0015] figure 1 and 2 are longitudinal sectional views of a plug valve with check function. Specifically, figure 1 A state where water is cut off is shown, while FIG. 2 shows a state where water is cut off when backflow has occurred.

[0016] The valve housing 1 of the plug valve is formed into a so-called Y shape, in which the center line of the flow path 3 (located on the primary side) of the inlet 2 communicating with the water supply source side and the flow path 5 of the outlet 4 communicating with the drain side (located on the secondary side) is on the same straight line, and the axis extending toward the secondary side of the valve port 6 for communicating between the primary side flow path 3 and the secondary side flow path 5 and the secondary side The flow path 5 forms an acute angle.

[0017] The upper portion of the valve sleeve 1 is formed in a substantially cylindr...

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Abstract

The present invention provides a water shut off valve with a backflow prevention function which a valve seat 10 is provided at a secondary side of a valve port 6 for communicating with a primary side flow passage 3 and a secondary side flow passage 5 and a valve element 11 is detachably provided to the valve seat 10. Between the valve element 11 and the spindle 7 which freely move forward and backward in an axial line direction of the valve port 6, the valve element 11 has a spring 12 for expanding and contracting between a spindle 7 and the valve element 11 according to progress of the spindle 7.

Description

technical field [0001] The invention relates to a plug valve with check function. Background technique [0002] Conventionally, a cock provided in a water supply pipe for branching a distribution water pipe does not have a check valve. Therefore, there is a risk that negative pressure will develop on the primary side of the plug valve (main flow side) or that the pressure on the secondary side (branch side) of the plug valve will become greater than the pressure on its primary side, so that water will flow back and contaminate the distribution. water pipe. [0003] In order to prevent backflow such as that described above, a check valve is provided in the middle of the flow path. However, since the check valve requires installation space, it can only be installed in a limited position in order to maintain coordination with peripheral equipment. Thus, check valves suffer from a lack of general versatility. Under such circumstances, a plug valve integrally formed with a ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K15/18F16K1/14F16K15/02F16K15/04F16K17/04F16K21/02
CPCF16K1/34F16K1/36F16K15/04F16K15/044F16K27/0209
Inventor 菱田真之土本胜已加藤真
Owner KANE KOUGYOU
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