an improved method and apparatus for a valve assembly features a valve body , a first seat ring mounted in the valve body , a second seat ring mounted in the valve body , and a retractable blade gate slideable in between the first seat ring and the second seat ring . the gate is moveable between open and closed position . a first elastomeric ring is disposed in between the valve body and the first seal ring and projecting towards the gate blade . a second elastomeric ring is disposed in between the second seat ring and the valve body and projecting towards the gate blade .