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US 2004/0168724 A1Published application
Gas pressure reduction valve
AssigneeAisan Kogyo Kabushiki Kaisha
InventorAkira Ando
Life of this patent
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Abstract
A first retainer and a second retainer are provided between a diaphragm and an upper housing. A first spring urges the diaphragm downward between the first retainer and the diaphragm. A second spring having an outer diameter smaller than that of the first spring urges the diaphragm downward between the first retainer and the second retainer.
Claims4
A gas pressure reduction valve, comprising:
- an upper housing;
- a lower housing having flow path between a primary pressure inlet and secondary pressure outlet;
- a diaphragm;
- an air chamber formed between said upper housing and said lower housing via said diaphragm, which has spring for biasing said diaphragm downward;
- and
- a decompression chamber formed between said upper housing and said lower housing via said diaphragm, which has a pressure-controlling valve body moving upward and downward with said diaphragm and a pressure controlling valve forming a valve seat opposite to said pressure-controlling valve body,
- wherein said flow path communicates with said decompression chamber via said valve seat,
- said gas pressure reduction valve decreases a gas pressure of said flow path by opening and closing said pressure-controlling valve, and
- said spring has at least two springs communicating in series between said diaphragm and said upper housing.
6 more elements
Dependencies are inferred from the claim text.