Abstract: A fluid-operated piston-type actuator includes a body having first and second axial ends and an inner surface that defines a bore that opens through at least one of the first and second axial ends to define an open end of the bore. A piston is slidably positioned in the bore. An end wall is positioned in blocking relation with the open end of the bore. The end wall comprises a peripheral surface that defines a first circumferentially extending groove that is axially aligned with a second circumferentially extending groove defined in the inner surface of the body when the end wall is positioned in blocking relation with the open end of the bore. The end wall further comprises an inner face oriented toward the piston and an opposite outer face oriented away from the piston. The first groove is located axially between the inner and outer faces.

Abstract: A fluid-operated piston-type actuator includes a body having first and second axial ends and an inner surface that defines a bore that opens through at least one of the first and second axial ends to define an open end of the bore. A piston is slidably positioned in the bore. An end wall is positioned in blocking relation with the open end of the bore. The end wall comprises a peripheral surface that defines a first circumferentially extending groove that is axially aligned with a second circumferentially extending groove defined in the inner surface of the body when the end wall is positioned in blocking relation with the open end of the bore. The end wall further comprises an inner face oriented toward the piston and an opposite outer face oriented away from the piston. The first groove is located axially between the inner and outer faces.

Abstract: The present invention is directed to a throttle control device to be used in combination with an engine having a throttle and a pump driven by the engine. The automatic control device has a housing defining a chamber having a first opening adapted to receive a fluid containing conduit in communication with the pump. A piston is slideably mounted in the chamber and has a first end acted on by a fluid contained in the conduit. A spring surrounds a portion of the piston within the chamber and biases the piston towards the first opening and, therefore, the fluid. A second end of the piston extends through a second opening in the chamber and controls the throttle. A first adjustable stop in the chamber limits travel of the piston and a second adjustable stop controls the compression of the spring.