Shutoff device

Details Shutoff device Shutoff device

2006-02-21

2006-02-21

Yu, Justine R. (Department: 3751)

Valves and valve actuation

Reciprocating valve

Gate

C251S328000, C251S329000, C251S368000

Reexamination Certificate

active

07000899

ABSTRACT:
A shutoff device for shutting off liquids or gases comprises a device housing (10) and a device (13) movable in said housing (10), the device (13) being provided with an opening (14). For sealing purposes, annular sealing bodies (28) are provided which are supported in annular fluid cylinders (27). The contact surfaces (34) are coated with a hard-material layer (37,39) which is subjected to microfinishing. The sealing bodies (28) are yieldingly supported such that they are capable of following any deformation or displacement of the device (13). The sealing is particularly suitable for aggressive and abrasive media and solids-carrying media.

REFERENCES:
patent: 5829735 (1998-11-01), Ikeda
patent: 6454015 (2002-09-01), Armstrong et al.
patent: 6691981 (2004-02-01), Hart

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