Means and method for repair of valves

Details Means and method for repair of valves Means and method for repair of valves

1976-06-30

1977-08-23

Cohan, Alan

Valves and valve actuation

Reciprocating valve

Gate

251367, F16K 2710

Patent

active

040435350

ABSTRACT:
A valve bonnet structure has an inner ring spaced slightly from the inner surface of the bonnet structure and secured along its lower edge portion to the bonnet. An angle-shaped member having a downturned leg lapping the ring is secured to the inner surface of the bonnet structure above the ring. For repair of the valve, an upper valve bonnet portion having the angle-shaped member thereon is removed by a cutting tool with the ring remaining in place on the lower valve bonnet portion. After repair of the valve, the upper and lower valve bonnet portions are welded together adjacent the ring with the downturned leg thereon fitting over the ring, and a seal between the leg and ring prevents fluid within the valve structure from being exposed to the welding operation.

REFERENCES:
patent: 3052444 (1962-09-01), Kintner
patent: 3743246 (1973-07-01), Heller

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