Overflow cut-off valve

A cut-off valve and overflow technology, applied in safety valves, balance valves, valve devices, etc.

Active Publication Date: 2013-12-25
孙达立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The overflow cut-off valve of this structure has the following problems: the inlet channel of the overflow valve under normal air pressure is the same channel as the outlet channel when the pressure is relatively large, and this channel is the gap between the pressure-holding thin rubber and o

Method used

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] An overflow cut-off valve, including a valve body 1 and a valve cover 2, the valve cover 2 is installed on the valve body 1, the valve body 1 includes a casing 3, a valve floating core assembly 4 and a pressure maintaining assembly 5, and the casing 3 is set A partition wall 6 separates the housing 3 into an upper chamber 7 and a lower chamber 8, the partition wall 6 is provided with a vent hole 9, the valve floating core assembly 4 is arranged in the lower chamber 8, and the pressure maintaining assembly 5 is arranged in the upper chamber 8, The pressure holding assembly 5 includes a cylindrical pressure holding plastic part 10, a rubber assembly 11, a cover 12 and a first return spring 36, the cover 12 is fixed on the housing 3,

[0035] The lower end of the pressure-holding plastic part 10 is open, and the vent hole 9 communicates wi...

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PUM

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Abstract

The invention discloses an overflow cut-off valve. Under the condition that a fuel tank is positioned at normal air pressure, gas inside the fuel tank exchanges with external gas through a gas outlet hole; under the condition that greater negative air pressure exists inside the fuel tank, the external gas bursts through a rubber assembly to enable each gas inlet channel to be conducted with a pressure-maintaining plastic part inner cavity; the external gas enters the fuel tank through the gas inlet channels. According to the overflow cut-off valve disclosed by the invention, gas outlet channels and the gas inlet channels are separated without mutual influence; the sizes of the gas outlet channels and the gas inlet channels can be respectively designed, so that the gas inlet channels and the gas outlet channels can be suitable for fuel tanks of vehicles with different powers and different sizes. The fuel tanks of the vehicles with the different sizes have little influence on a gas outlet hole in an annular convex rib because the fueling speed of the fuel tank cannot change due to the change of the size of the fuel tank. The gas inlet channels and the rubber assembly commonly influence the gas inlet speed at negative pressure, so that the air inlet speed can be slightly adjusted according to the gas inlet channels and the rubber assembly to meet the requirements on the fuel tanks with the different sizes.

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. 201210229757.9 published on October 17, 2012. Shut-off valve", including pressure-holding plastic parts and pressure-holding thin rubber, [0003] The periphery of the pressure-holding rubber is pressed between the annul...

Claims

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Application Information

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IPC IPC(8): F16K17/196
Inventor 孙达立
Owner 孙达立
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