초록 ▼

The shut-off valve (1, 40, 85) comprises a valve housing (2) having at least two chambers (3, 4, 5) adjoining one another in axial direction. The chambers are communicating with one another through a passage bounded by a valve seat (6, 7). A valve body (15) is axially movable in the housing and co-o

The shut-off valve (1, 40, 85) comprises a valve housing (2) having at least two chambers (3, 4, 5) adjoining one another in axial direction. The chambers are communicating with one another through a passage bounded by a valve seat (6, 7). A valve body (15) is axially movable in the housing and co-operates with each valve seat for closing the associated passage. The valve body is guided with sealed passages through the walls of the axially outer chambers opposite the valve seat (6, 7). The passages and each valve seat have substantially the same diameters. The valve body can be composed of an upper valve body and a lower valve body part both being provided with a sealing ring co-operating with the same cylindrical valve seat.

대표청구항 ▼

A shut-off valve comprising the combination of a valve housing having opposite end passages and including an enlarged upper chamber and an enlarged lower chamber and ports communicating respectively with said chambers, said housing also including a valving passage between said chambers, said passage

A shut-off valve comprising the combination of a valve housing having opposite end passages and including an enlarged upper chamber and an enlarged lower chamber and ports communicating respectively with said chambers, said housing also including a valving passage between said chambers, said passages all being of substantially the same diameter and a valve body having discrete first and second portions sealingly cooperative with said passages and axially slidable in said housing between a shut-off position in which adjacent parts of the first and second portions project within the valving passage and in circumferentially sealing contact therewithin so that the valving passage is blocked and an open position in which said adjacent parts of the first and second portions are out of the valving passage and out of circumferentially sealing contact therewithin so that said valving passage is unblocked to communicated said chambers, said first and second portions being coaxially aligned, said second portion being hollow to define a conduit extending exteriorly of said housing, said second portion having an opening communicating said conduit with a space between said adjacent parts of said first and second portions, said space being surrounded by and within said valving passage between the circumferential seals between the first and second portions and the valving passage when said valve body is in said closed position thereof to prevent flow between said ports in the event of sealing failure at said valving passage when the valve body is in said closed position thereof.