System, method and apparatus for split gate valve with...

Details System, method and apparatus for split gate valve with... System, method and apparatus for split gate valve with...

2011-07-12

2011-07-12

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

With means to increase head and seat contact pressure

Gate valve

C251S193000, C251S196000

Reexamination Certificate

active

07975983

ABSTRACT:
A split gate is movably mounted within a valve body along a valve axis between valve seats. The split gate has gates, each extending between one of the valve seats and the other gate. In an open position, gate holes register with a fluid aperture and the valve seats to permit fluid flow. In the closed position, the holes do not register with the fluid aperture to prevent fluid flow. The split gate valve also has a gate guide located in the body for moving the gates with respect to the valve seats along the fluid axis. The gate guide forces the pair of gates apart along the fluid axis and into contact with the valve seats in both the open and closed positions. The gates have axial play along the fluid axis when the split gate is between the open and closed positions.

REFERENCES:
patent: 2855175 (1958-10-01), Dunbar
patent: 2866253 (1958-12-01), Wynn
patent: 3036813 (1962-05-01), Lee
patent: 3368792 (1968-02-01), Siegfried
patent: 3823911 (1974-07-01), Natho et al.
patent: 5722636 (1998-03-01), Houston
Graygate Skirted Spring Expander, Gray Tool Company, Drawing No. C-64962.
Graygate Gate Segment Assembly Double Wedge, Drawing No. B 63358, Nov. 1973.
Graygate Double Wedge Expander, Drawing No. 64971, Aug. 1972.

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