Title:
CHECK VALVE
Document Type and Number:
WIPO Patent Application WO/2010/064475
Kind Code:
A1
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).
Inventors:
YAMAGUCHI KOSEI (JP)
Application Number:
PCT/JP2009/064641
Publication Date:
June 10, 2010
Filing Date:
August 21, 2009
Export Citation:
Assignee:
PIOLAX INC (JP)
YAMAGUCHI KOSEI (JP)
YAMAGUCHI KOSEI (JP)
International Classes:
F16K17/196; B60K15/035; F16K24/00
Foreign References:
| JP2005133875A | 2005-05-26 | |||
| JP3421828B2 | 2003-06-30 | |||
| JP2006329245A | 2006-12-07 | |||
| JPH03267565A | 1991-11-28 | |||
| US20010020415A1 | 2001-09-13 |
Attorney, Agent or Firm:
MATSUI SHIGERU (JP)
Shigeru Matsui (JP)
Shigeru Matsui (JP)
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