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US 5,397,221 AGranted
Valve operating mechanism
AssigneeYamamoto Suiatu Kogyosho Co., Ltd.
InventorsKatsumi Onizuka, Satoshi Matsuno, Kazuo Sasaki
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Abstract
A valve operating mechanism which opens and closes a passage communicating to a cavity by contraction and restoration of a packing, with little mechanical movable parts for the opening/closing operation.
Drawings
Claims1
A valve and operating mechanism therefor comprising:
- a main body casing having a cavity therein;
- first and second ports extending through said main body casing for respectively admitting fluid to and discharging fluid from said main body;
- means forming a respective first and second annular passage at the ends of said cavity for providing communication between said cavity and a respective one of said first and second ports;
- a pressure responsive annular packing at each of said annular passages to open and close the passage upon application and removal of pressure to effect expansion and contraction of said packing;
- means for adding pressure to said cavity;
- and
- means for selectively applying pressure to said annular packings to:
- a) open the first passage between said first port and said cavity and close the second passage between said second port and said cavity to admit fluid into said cavity,
- b) to close said first and second passages to contain fluid in said cavity for application of pressure from said pressure adding means to the fluid contained in the cavity, and
- c) closing said first passage and opening said second passage to permit the pressure treated fluid to exit from said cavity through said second port.
7 more elements
Dependencies are inferred from the claim text.