Reduced torque gate valve with roller screw

Details Reduced torque gate valve with roller screw Reduced torque gate valve with roller screw

2005-07-19

2005-07-19

Look, Edward K. (Department: 3751)

Valves and valve actuation

Reciprocating valve

Gate

C251S267000

Reexamination Certificate

active

06918574

ABSTRACT:
A gate valve is disclosed which comprises a valve body which includes a flow bore that extends completely therethrough and a gate cavity that extends partially therethrough and intersects the flow bore, a bonnet which is connected to the valve body over the gate cavity, a gate which is disposed in the gate cavity across the flow bore and includes a transverse opening that extends completely therethrough, a valve stem which includes a first portion that is connected to the gate and a second portion that extends through the gate cavity, a handwheel, and a roller screw assembly which is connected between the handwheel and the second portion of the valve stem and which converts rotation of the handwheel into translation of the valve stem. In this manner, translation of the valve stem raises or lowers the gate to bring the opening into or out of alignment with the flow bore to either open or close the gate valve, respectively.

REFERENCES:
patent: 3223380 (1965-12-01), Hochmuth et al.
patent: 3770247 (1973-11-01), Nelson
patent: 4264054 (1981-04-01), Morrill
patent: 5090661 (1992-02-01), Parks, Jr. et al.
patent: 5192051 (1993-03-01), Roberson
patent: 6572076 (2003-06-01), Appleford et al.
patent: 2 536 822 (1984-06-01), None
patent: WO 01/14775 (2001-03-01), None

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