[특허]Actuator rod hermetic sealing apparatus employing concentric bellows and pressure compensating sealing liquid with liqui

[미국특허] Actuator rod hermetic sealing apparatus employing concentric bellows and pressure compensating sealing liquid with liqui 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16J-015/16 F16J-015/40
출원번호	US-0047784 (1993-04-15)
발명자 / 주소	Coles Carl R. (5765 S. Kings Dr. Springfield MO 65810)
인용정보	피인용 횟수 : 64 인용 특허 : 0

초록 ▼

An apparatus that provides a hermetic seal of a valve actuator rod in a valve housing includes a piston having a center bore mounted on the actuator rod and a pair of concentric bellows, both connected to the piston at one end and connected to the actuator rod and the interior of the valve housing at their opposite ends. A sealing liquid contained in the valve housing at one side of the pair of bellows provides pressure compensation for a process pressure on the opposite sides of the bellows. The piston bore provides a tight sliding fit of the piston on the actuator rod and the piston is provided with at least one flow bypass channel permitting unrestricted flow of the sealing fluid through the piston channel. A sensitive monitoring system is mounted on the valve housing and detects slight leaks of sealing liquid through the concentric bellows or the actuator rod packing by detecting changes in the position of the piston relative to the valve housing interior.

대표청구항 ▼

An apparatus providing a seal between a wall of a enclosure and an actuator rod mounted to the enclosure for movement of the rod relative to the enclosure, the rod extending from an exterior environment of the enclosure through an opening in the enclosure wall into an interior volume of the enclosure, the apparatus comprising: a housing secured to the enclosure around the opening in the enclosure wall, the housing having an interior chamber and first and second openings through the housing to the interior chamber, the second opening adjoining the opening in the enclosure wall and communicating the chamber with the interior volume of the enclosure and the actuator rod extending from the exterior environment through the housing first opening, the interior chamber, the housing second opening and the opening in the enclosure wall into the interior volume of the enclosure; a seal between a circumference of the actuator rod and the first housing opening sealing the housing chamber from the exterior environment; a piston having opposite first and second end faces and a center bore, extending between the first and second end faces, the bore being mounted over the circumference of the rod for sliding movement of the piston along the actuator rod within the chamber; a first bellows connected between the piston and an interior surface of the chamber and a second bellows connected between the piston and the actuator rod, the first and second bellows and the piston separating an interior volume of the chamber into first and second areas and sealing the first and second areas from each other, the second area communicating with the interior volume of the enclosure through the housing second opening and the opening in the enclosure wall and the first area being filled with a sealing fluid; and, means provided on the piston for conducting reciprocative flow of the sealing fluid between the first and second end faces of the piston the mounting of the piston center bore over the circumference of the actuator rod restricts flow of the sealing fluid between the first and second piston end faces through the center bore, and the means provided on the piston for conducting reciprocative flow of the sealing fluid between the first and second piston end faces bypasses flow of sealing fluid through the piston center bore.

이 특허를 인용한 특허 (64) 인용/피인용 타임라인 분석

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[미국특허] Actuator rod hermetic sealing apparatus employing concentric bellows and pressure compensating sealing liquid with liqui 원문보기

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[미국특허] Actuator rod hermetic sealing apparatus employing concentric bellows and pressure compensating sealing liquid with liqui 원문보기

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