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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/596.16 ; 251/026 ; 60/404 ; 91/461|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 10 인용 특허 : 3|
A fail-safe closure system for one or a plurality of springless process valve actuators is disclosed. An accumulator is provided with an urging means, such as a spring for pressurizing fluid stored therein. A source of pressurized fluid is also provided. Supply pressurized fluid is applied to an opening chamber of one or a plurality of process valve actuators while a flow path is opened to a vent from the closing chamber of the one or more actuators. For closing the actuator or actuators, a flow path is established by which pressurized fluid from the acc...
[ What is claimed is:] [1.] A fail-safe closure apparatus for a process valve actuator, which includes a piston with an opening chamber on one side of the piston and a closing chamber on an opposite side of the piston, comprising:a supply source of pressurized fluid for controlled application of pressurized fluid to said opening chamber;an accumulator source of pressurized fluid for controlled application of pressurized fluid to said closing chamber;a first control means including a first control valve having active and passive positions for directing pr...