Maintenance method and maintenance kit for a gate valve

Details Maintenance method and maintenance kit for a gate valve Maintenance method and maintenance kit for a gate valve

1997-06-04

1999-03-09

Walton, George L.

Fluid handling

Processes

Cleaning, repairing, or assembling

292216, 29890121, 29980124, 137315, 137312, 251214, F16K 4300, F16K 4102

Patent

active

058787690

ABSTRACT:
The maintenance method is for a gate valve. The method comprises the steps of closing the gate valve; removing sequentially the hand wheel, the gland flange, the gland and the packing from the stem of the gate valve; mounting a first clamp onto the gate valve to keep the disc of the valve in an obturating position; untying the packing box and sliding it at least partially along the stem. The method further comprises the steps of removing the packing ring from the shouldering of the stem; mounting a second clamp onto the gate valve to keep the disc in the obturating position; removing the first clamp from the stem; sliding and removing the packing box and the packing ring from the stem; inserting a new packing ring along the stem; putting back the packing box along the stem; mounting again the first clamp onto the gate valve; removing the second clamp from the shouldering; and positioning the new packing ring onto the shouldering of the stem.

REFERENCES:
patent: 955334 (1910-04-01), Hosfer
patent: 1433139 (1922-10-01), Lofton
patent: 2373020 (1945-04-01), Doster
patent: 2746470 (1956-05-01), Laird
patent: 2757897 (1956-08-01), Cline
patent: 2780233 (1957-02-01), Volpin
patent: 2809059 (1957-10-01), Hillis
patent: 4327760 (1982-05-01), Lancaster
patent: 4394872 (1983-07-01), Schobl
Article published by Hydro-Quebec in Jan. 1995, entitled "Une ide-maison pour epargner temps et argent" / A home-made idea to same time and money.

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