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Check valve

A check valve and valve seat technology, applied in the directions of safety valves, balance valves, valve devices, etc., can solve problems such as the increase of fuel tank pressure, and achieve the effects of suppressing vibration, simplifying the manufacturing process, and reducing flow resistance.

Active Publication Date: 2011-10-26
PIOLAX CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the pressure in the tank increases

Method used

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Embodiment Construction

[0069] Next, embodiments of the check valve of the present invention will be described with reference to the accompanying drawings.

[0070] figure 1 , figure 2 Shown is the check valve 1, which prevents the fuel tank from bursting by discharging fuel vapor from the fuel tank when the pressure inside the fuel tank increases to a predetermined value or higher (positive pressure state), and the pressure inside the fuel tank decreases When the pressure reaches a predetermined value or lower than atmospheric pressure (negative pressure state), the check valve 1 prevents the collapse of the fuel tank by introducing external air into the fuel tank. This check valve 1 includes: a main case 10, which is connected to a pipe communicating with the inside of the oil tank, and the main case 10 has a positive pressure valve seat 15a formed therein; a sub case 20, which is fitted to the main case 10 to form a A valve chamber V, and the sub-case 20 communicates with the outside of the oil...

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Abstract

A check valve is capable of reducing the operation noise produced when a positive pressure valve and a negative pressure valve are slid and facilitates the assembling of the positive pressure valve and the negative pressure valve. The check valve (1) comprises a casing body (10), a sub casing (20), the positive pressure valve (30), and the negative pressure valve (50). The positive pressure valve (30) comprises a through hole (39) and a negative pressure valve seat (36a), and the negative pressure valve (50) comprises a leg section (53). A cap (60) is disposed in the positive pressure valve (30). A positive pressure spring (S1) is disposed between the positive pressure valve (30) and the sub-casing (20), and a negative pressure valve (S2) is disposed between the positive pressure valve (30) and the cap (60). A positive pressure flow passage (R1) allowing fuel vapor to flow out is formed between the outer periphery of the positive pressure valve and the inner periphery of the casing body. The positive pressure flow passage is disposed further on the outer side than the positive pressure spring (S1). A negative pressure flow passage (R2) allowing the outside air to flow in is formed between the inner periphery of the positive pressure valve and the outer peripheries of the leg section and the cap and between the through hole and the leg section. The negative pressure flow passage is disposed further on the outer side than the negative pressure spring (S2).

Description

technical field [0001] The invention relates to a check valve for adjusting the pressure in the oil tank of a motor vehicle. Background technique [0002] Typically, a check valve is installed in the fuel tank of a motor vehicle. The check valve prevents the fuel tank from bursting by discharging fuel vapor from the fuel tank when the pressure in the fuel tank increases to a predetermined value or higher, and, when the pressure in the fuel tank decreases to a predetermined value or below atmospheric pressure, by Outside air is introduced into the tank, and the check valve prevents the tank from collapsing. [0003] As a conventional check valve, Patent Document 1 discloses a check valve including a first body, a second body, a positive pressure valve and a negative pressure valve. The second body is welded integrally with the first body to form a valve chamber. The positive pressure valve is arranged in the valve chamber, and the negative pressure valve is slidably accomm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K15/035F16K17/196F16K24/00
CPCB60K15/03519B60K2015/03585F16K17/196Y10T137/7777Y10T137/7837Y10T137/778
Inventor 山口弘晴
Owner PIOLAX CO LTD
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