Patent ID: 8662105

Claim:
A suction valve which comprises: a valve seat having flow passages therethrough, a valve guard having outlet passages therethrough, a valve element movably positioned between said valve seat and said valve guard and capable of opening or closing the flow passages in the valve seat, an unloader located on a side of said valve seat opposite said valve element, said unloader comprising a plurality of fingers which extend through some of said flow passages of said valve seat to contact said valve elements, said unloader having an internal wall defining an elongated central recess and which has a non-circular inner contour, a central connecting bolt which has a first end attached to said valve guard and a second end located in said recess, and extending through said valve element and said valve seat, a valve nut in said elongated central recess and mounted on said central connecting bolt, said valve nut having an outer contour with a non-circular cross section, and an anti-rotation locking disk in said elongated central recess and mounted around said valve nut, said anti-rotation locking disk having an inner recess with a non-circular cross section that mates with said non-circular cross section of said outer contour of said valve nut so as to be non-rotational relative thereto, and an outer contour which mates with said non-circular inner contour of said wall of said unloader which defines said elongated central recess so as to be non-rotational with respect thereto, said unloader being axially movable relative to said central connecting bolt but non-rotatable with respect thereto.