Method and apparatus for damping an actuator on a fluid regulator

摘要

A damped actuator for a fluid regulator includes a diaphragm disposed in a housing, and a damper arranged to stabilize movement of the diaphragm in response to changes in pressure inside the housing. The damper includes a ball check valve arranged to allow air to exhaust out of the housing when above a preselected pressure. The damper may include interchangeable components so as to be modifiable to have different set point pressures to achieve different backpressures inside the housing.

主权项

1. A damped actuator for use with a fluid regulator, comprising:
an actuator housing; a diaphragm disposed in the actuator housing and separating the actuator housing into a first chamber and a second chamber; an actuator linkage operatively connected to the diaphragm and arranged to be operatively connected to a valve stem and to shift the valve stem between a first position and a second position; a vent opening formed in the actuator housing and extending into the second chamber, wherein the first chamber is hydraulically connected to a fluid outlet of a regulator body and senses a fluid pressure at the fluid outlet, and the vent hydraulically connects the second chamber to surrounding ambient atmosphere; and a damper operatively coupled to the vent opening, the damper including:
a sleeve operatively coupled to the vent opening, the sleeve including a bore;a valve seat releasably mounted within the bore, wherein the valve seat comprises a plug body having a releasable mounting connection, wherein the plug body is disposed within the bore, and the releasable mounting connection releasably couples the plug body to the sleeve;a ball shiftably disposed in the bore, the ball arranged to shift from a closed position seated against the valve seat to an open position disposed away from the valve seat;a spring positioned to bias the ball toward the valve seat, the spring arranged to allow the ball to shift to the open position when fluid pressure within the second chamber exceeds a threshold pressure to thereby vent fluid pressure from the second chamber.