Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1980-01-10
1982-06-29
Spiegel, H. Jay
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
251315, F16K 506
Patent
active
043369197
ABSTRACT:
A ball valve is disclosed comprising a single piece body with a ball-shaped, two-part valve member therein operable by a rotatable stem formed separately from the valve member, this stem being so formed that it cannot be blown out from the valve by internal pressure in the valve during servicing.
The stem extends from the interior to the exterior of the valve through a stem passage providing, adjacent the chamber which houses the valve member, a first plain bearing supporting a portion of the stem for rotation about the stem axis. The stem has an enlarged portion within the valve chamber which is too large to pass the first plain bearing, the enlarged portion having a shoulder adapted for sealing engagement with a seat formed within the valve body around the stem passage. A detachable bridge forms a bearing element which provides a second plain bearing for a reduced diameter portion of the stem of the valve member and also forms with, a thrust washer and a further shoulder provided by the stem, a thrust bearing which normally holds the stem in a position in which the first-mentioned shoulder is spaced from said seat formed within the valve body. A packing chamber filled with packing compressed axially by a gland is provided between the first and second bearings.
Thus the detachable bridge can be removed from the valve body and the valve stem for servicing of the gland and packing without danger of blow-out of the stem or leakage past the seal formed, after removal of the detachable bridge and outward displacement of the valve stem to bring the first-mentioned shoulder into sealing engagement with said seat formed within the valve body. In assembly of the valve, the stem is inserted from the interior of the ball chamber.
REFERENCES:
patent: 3216697 (1965-11-01), Holmberg
patent: 3841601 (1974-10-01), Grove et al.
patent: 3940107 (1976-02-01), Allenbaugh, Jr.
patent: 4103867 (1978-08-01), Orr
patent: 4150811 (1979-04-01), Condit
patent: 4175580 (1979-11-01), Kalbfleisch
patent: 4184507 (1980-01-01), Richards
Lake & Elliot Incorporated
Spiegel H. Jay
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