Overflow cutting valve

A cut-off valve and overflow technology, applied in safety valves, balance valves, valve devices, etc., can solve problems such as unfavorable rapid adjustment of fuel tanks, fuel overflow, etc.

Active Publication Date: 2014-06-04
孙达立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems of this structure are: 1. When there is a large pressure difference between the fuel tank and the outside, the airflow channel formed by the ventilation gap and the air intake hole is fixed, which is not conducive to quickly adjusting the balance of the pressure difference inside and outside the fuel tank
2. The height between the ventilation gap and the valve cover is relatively low, and the design of the pressure-holding structure on the upper end of the product itself, in the case of fuel tank shaking, the probability of fuel overflow is relatively high

Method used

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] An overflow cut-off valve, including a valve body and a valve cover 1, the valve cover 1 is installed on the valve body, the valve body includes a casing 2, a valve floating core assembly and a pressure maintaining assembly, and an isolation assembly 3 is arranged in the casing 2 to The shell is divided into an upper chamber 4 and a lower chamber 5, the isolation assembly 3 is provided with an air intake channel 6, the valve floating core assembly is arranged in the lower chamber 5, and the pressure maintaining assembly is arranged in the upper chamber 4, and the pressure maintaining assembly includes a pressure maintaining plastic Part 7, pressure-holding thin rubber 8, cover 9 and first return spring 10, cover 9 is fixed on the housing 2,

[0023] The pressure-preserving plastic part 7 includes a cylinder 71 and a limiting assembly 72...

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Abstract

The invention discloses an overflow cutting valve; the periphery of a pressure-maintaining thin rubber is pressed between an annular base and a bottom board; on a condition that an oil case is at normal air pressure, a part close to the central hole of the pressure-maintaining thin rubber is close to steps; gas in the oil case is exchanged with exterior through a micro-gap between the pressure-maintaining thin rubber and the steps; when relatively large negative air pressure is in the oil case, the part close to the central hole of the pressure-maintaining thin tuber is moved downwardly under the action of external air pressure; external gas enters the oil case through a gas inlet groove; according to advantages of the invention, balance of internal / external pressure difference in a fuel case can be regulated quickly; when the oil case is shaken, probability for overflowing fuel oil is reduced greatly.

Description

technical field [0001] The invention relates to a valve body, in particular to an overflow cut-off valve. Background technique [0002] An overflow cut-off valve is usually installed on the vehicle fuel tank, which has the following functions: 1) When the vehicle fuel tank is filled with oil, the vehicle fuel tank and the atmosphere have a certain passage through the overflow cut-off valve; and when the vehicle fuel tank is filled with fuel, The spill shut-off valve automatically closes to prevent fuel from spilling out of the spill shut-off valve. 2) The last important thing is that when the position of the fuel tank changes suddenly (such as the vehicle overturns), the overflow cut-off valve will prevent the fuel from flowing out, such as the patent No. 201120078737.7 published on September 14, 2011, which is named "A kind of overflow Shut-off valve", which discloses that the valve body includes a valve casing, a valve bottom cover is installed on the bottom of the valve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K17/19
Inventor 孙达立
Owner 孙达立
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