Well shut off device

Details Well shut off device Well shut off device

2005-03-29

2005-03-29

Tsay, Frank (Department: 3672)

Wells

With eduction pump or plunger

With packer or plug

C166S118000

Reexamination Certificate

active

06871704

ABSTRACT:
A well shut off device for completely sealing off a flowing well. The resilient center seal member is sandwiched between upper and lower face plates. A group of fastening members holds together the face plates and the central seal member for urging the central seal member into intimate sealing contact with the well casing of the well and with the couplings when the fastening members are tightened.

REFERENCES:
patent: 3734179 (1973-05-01), Smedley
patent: 4007905 (1977-02-01), Mott
patent: 4545433 (1985-10-01), Wambaugh
patent: 4655284 (1987-04-01), McIlvride
patent: 5031696 (1991-07-01), Zwiegel
patent: 6644401 (2003-11-01), Miller

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