Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1993-04-15
1995-01-17
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
137315, 137317, 138 89, 138 94, 138 97, F16K 4300
Patent
active
053818156
ABSTRACT:
A method for isolating a relief valve, the relief valve being positioned in fluid communication with a pressurized vessel by positioning a gate valve body between and in fluid communication with the relief valve and the pressurized vessel, the gate valve body including a plug and a cap positioned to sealingly close an opening in the gate valve body generally covered by a gate valve bonnet cover and yoke, removing the cap, sealingly positioning a sandwich valve over the opening in the gate valve so that when the pass-through is opened a passageway through the pass-through sandwich valve is generally co-axial with the opening in the gate valve, sealingly positioning a removable yoke over the passageway through the pass-through, the removable yoke including a stem and being adapted to movement of the stem through the removable yoke; opening the pass-through; moving the stem into engagement with the plug and removing the plug from the opening in the gate valve body; and positioning a valve gate on the stem and moving the valve gate into closing engagement with valve seats positioned in the gate valve body to isolate the relief valve.
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Okonek Leslie J.
Wegner John W.
Atlantic Richfield Company
Koppl Company Incorporated
Walton George L.
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