Fisher Controls Company, Inc.

Donald D Rice

Herbert H Walton

A single-ported double-seated valve mechanism is a valve body means with an inlet and outlet communicated by a flow passage and a chamber for receiving valve trim. A bonnet is secured to the valve body means. Valve trim is fixedly secured to the bonnet and positioned within the chamber. The bonnet and valve trim may be removed from the valve as a unit. An outwardly extending portion of the bonnet is sized to fit within the valve body wherein the valve body serves as a support or vise.

Valve construction

Disclosed herein is a valve trim assembly wherein a valve cage member and a valve plug are provided which cannot be independently rotated. A valve stem is affixed to the plug and extends out of the cage. The cage and the stem are threaded for attachment to a valve bonnet and an actuator, respectively, and by rotation of the cage, the cage is attached to the bonnet and the stem is attached to the actuator simultaneously. The stem is prevented from unscrewing from the actuator while the valve is in use, by means of the anti-rotation feature. The trim assembly can thus be installed in, or removed from, a valve quickly and with a minimum number of tools.

Quick change valve trim assembly

Described herein is a structure for attachment of two parts of a valve structure in a pressure-tight leakproof relationship, which employs a minimum number of parts and may be quickly disassembled, but which is nonetheless strong, rugged, and durable. This structure includes a first member having two pairs of spaced-apart lugs protruding in a direction generally parallel to the axis of an opening in the first member. A second member is provided which extends into the opening and includes two ears, each ear being adapted for placement between two lugs. The lugs are provided with matching transverse holes, whereby a bolt or pin may be placed through one lug of a pair, then over a portion of an ear, then into the second lug of the pair for securing the two members together in a predetermined relationship. Means are provided for detection of internal pressure in the valve to prevent disassembly thereof prior to removal of the pressure.

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Marshalltown, IA, United States of America

Donald D Rice