Abstract: A spring seat for use with actuators is described herein. An example spring seat includes a body having a shoulder to receive an end of an actuator spring, a guide projecting away from the shoulder toward a first surface of the body, wherein the guide is configured to fit within an inner diameter of the coil spring to retain the end coil spring in engagement with the shoulder, and an aperture in a surface of the body opposite the guide, wherein the aperture is configured to receive an end of an adjuster of the pneumatic actuator such the aperture engages the adjuster to substantially reduce tilting of the body and buckling of the spring.

Abstract: A vibration damper apparatus for use with fluid control devices is disclosed. An example fluid control device includes a housing and a piston having an outer circumferential surface and configured to be responsive to pressure within the housing to control the position of a fluid flow control member within the housing. The example fluid control device also includes a guide ring coupled to the housing and having an opening configured to receive at least a portion of the piston, and a vibration damper disposed between the guide ring and the piston to frictionally engage the outer circumferential surface of the piston.