Valves and valve actuation – Lost motion between actuator and valve – Lever
Patent
1989-06-22
1991-06-18
Chambers, A. Michael
Valves and valve actuation
Lost motion between actuator and valve
Lever
251229, 74104, 13762413, F16K 3144
Patent
active
050244167
ABSTRACT:
The problem of providing a very compact and simple actuator system (10) for a rotary valve (40) operated by a rotatable shaft (44) and effecting a specific valve program to select a desired flow rate through the valve (40) is provided by an actuator member (12) movable in a linear path (A) transverse to the axis of the shaft. The actuator member (12) is linearly movable through a stroke range to effect changing the angular settings of the shaft (44) to move the valve (40) from an open position to a closed position and back to an open position in response to a single unidirectional stroke of the actuator member (12). A pair of link arms (26a, 26b) operatively connect the actuator member (12) and the shaft (40) for transmitting linear movement of the actuator member to angular movement of the shaft. The link arms are pivotally connected to each other at adjacent ends (28). An opposite end (30) of one link arm (26a) is fixed to the shaft, and an opposite end (34) of the second link arm (26b) is pivotally connected to the actuator member (12). The connection between the second link arm (26b) and the actuator member (12) is in the form of a pin-and-slot (32, 34) connection to provide for lost motion such that the actuator member (12) moves through a portion of its stroke without effecting angular movement of the shaft (44) before effecting a change in the angular setting of the shaft.
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Chambers A. Michael
Sundstrand Corporation
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