Patent ID: 8567752
Filing Date: 2013-10-29
Classification: F15B,F16K

Abstract:
1. A rotary valve actuator, comprising: a housing containing a first piston and a second piston opposite the first piston to define an inner chamber therebetween, wherein the pistons are to move in opposite directions to rotate a shaft of the rotary valve actuator; a first port in fluid communication with the inner chamber and a first fluid pathway; a second port different than the first port, the second port in fluid communication with the inner chamber and a second fluid pathway; and a damper coupled to at least one of the first piston or the second piston to slow the movement of the pistons for only a portion of a stroke of the rotary valve actuator, wherein the first piston is to move the damper between a first position to enable fluid flow between the inner chamber and the first port and a second position to substantially prevent fluid flow between the inner chamber and the first port over the portion of the stroke, wherein fluid in the inner chamber is directed toward the second port when the damper is in the second position.