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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2015/178308
Kind Code:
Provided is a check valve, comprising a positive pressure valve and a negative pressure valve, wherein the assemblability of the negative pressure valve with the positive pressure valve is improved. This check valve (10) comprises: a casing (15) in which a positive pressure valve seat (24) is formed; a positive pressure valve (40) in which a negative pressure valve seat (44) is formed; a negative pressure valve (50) that opens and closes the negative pressure valve seat (44); a retaining member (60) that retains and holds the negative pressure valve (50) against the positive pressure valve (40); and a negative pressure valve spring (S2) that biases the negative pressure valve (50). The negative pressure valve (50) comprises a head section (51), a shaft section (53), and an engagement section (55). The retaining member (60) comprises: a base section (61) in which an insertion hole (63) is formed; an elastic locking piece (67) that engages with the engagement section (55); a spring support section (64); and a pressing section (70) that, when the engagement section (55) is engaged with the elastic locking piece (67), is located further to the distal end in the direction of insertion than a tip (56) of the shaft section (53).

YAMAGUCHI Kosei (INC. 51, Iwai-cho, Hodogaya-ku, Yokohama-sh, Kanagawa 23, 〒2400023, JP)
Application Number:
Publication Date:
November 26, 2015
Filing Date:
May 15, 2015
Export Citation:
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PIOLAX, INC. (51 Iwai-cho, Hodogaya-ku Yokohama-sh, Kanagawa 23, 〒2400023, JP)
International Classes:
B60K15/035; F02M37/00; F16K15/02; F16K17/04; F16K24/00
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
MATSUI Shigeru (2nd Floor, Ginza Chuo Bldg. 16-5, Ginza 8-chome, Chuo-k, Tokyo 61, 〒1040061, JP)
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