US 4,575,101 A · Device for safe on-stream addition of valve packing

Abstract

A fitting for safe on-stream addition of valve packing which comprises a housing enclosing a first and second chamber each chamber associated with a means for ejecting valve packing, the first chamber being accessible from the valve when the fitting is mounted and also accessible from the second chamber through sealable portals, and the second chamber having a sealable entrance to receive valve packing, thereby enabling safe addition of valve packing to a valve through the valve gland by: sealing the first chamber, adding valve packing to the second chamber and sealing the second chamber, opening the access portal between the chambers and ejecting the valve packing from the second chamber into the first chamber, sealing the access portal between the chambers and opening the portal between the first chamber and the valve, and ejecting the valve packing from the first chamber into the valve.

Claims6

Dependent claims

A fitting safely used to add an injectable material to a valve in high pressure service which comprises a housing enclosing a first and a second sealable chamber, each chamber associated with a means for ejecting said injectable material from said chamber;

and which fitting when mounted to said valve has a first sealable portal between its first chamber and said valve and also a second sealable portal between its first chamber and its second chamber, said second chamber having a sealable entrance portal to receive said injectable material;
said chamber and portals being arranged and equipped with seals in such a manner that each portal can be independently sealed or opened thereby permitting the addition of said injectable material to said valve by a succession of injections from said second chamber to said first chamber to said valve while at all times having at least two portals sealed between the fluid in said valve and the outside of said entrance portal of said second chamber.

Dependencies are inferred from the claim text.

Device for safe on-stream addition of valve packing

Life of this patent

Device for safe on-stream addition of valve packing

Life of this patent

Abstract

Claims6