Patent ID: 6318701
Filing Date: 2001-11-20
Classification: F15B

Abstract:
A pneumatic valve actuator comprising:a housing having an interior and exterior surface;a rotary piston having an interior and exterior and at least a top-side, a bottom-side and a peripheral wall and contained in the interior of said housing;sealing means, disposed in the interior surface of said housing wherein said sealing means is cooperatively arranged with said housing and said piston such that said sealing means is in contact with the exterior of said piston and said housing and thereby defines a first and second chamber within said housing;means for effecting movement of at least a portion of said piston from said first chamber into said second chamber and back into said first chamber, such movement comprising one cycle of said piston;means for transferring movement of said piston to a further device;wherein said housing is comprised of two halves and said sealing means is securely received in a groove which is formed upon joining said halves of said housing, said groove defines a loop on an inside wall of said housing where said halves join, said sealing means comprising a single loop of sealing material; andwherein said sealing material is selected from the group comprising fluorelastomer, nitrile rubber, or polyurethane.