Gas compressor head and discharge valve construction

A gas compressor having block means with cylinder means formed therein, piston means mounted for reciprocation in said cylinder means, cylinder head means mounted on said block means over the end of said cylinder means to provide discharge chamber means, gas discharge valve means intermediate said head and cylinder means defining compression chamber means and providing discharge passage means and valve means therein adapted to open said discharge passage means to said discharge chamber means for pressurized gas on the compression stroke of said piston means and to close said discharge passage means on the suction stroke of said piston means, first suction gas inlet means through the wall of said cylinder means at a position remote from said cylinder head means, second suction gas inlet passage means in said piston means extending through the outer wall thereof and into communication with said first passage means over at least a substantial portion of the travel of said piston means, suction gas port means in the top of said piston means in communication with said second passage means, said port means comprising suction port means defining an aperture through the top of said piston means, wherein said suction port seat means comprises two radially spaced and substantially concentric seat lands between which the suction gas flows into the compression chamber during the suction stroke, and suction valve disc means mounted in the upper portion of said piston means for limited axial, floating movement and having disc seat means adapted to bear against said suction port seat means on the compression stroke of said piston means to close off said second passage means from said compression chamber, said floating movement being sufficient for movement of said disc seat means away from said suction port seat means to provide said suction gas port means with suitable open dimensions to allow adequate low-pressure refrigerant gas flow into said compression chamber during the suction stroke of said piston means,

• said cylinder head means comprising body means having wall means formed to provide said discharge chamber means, discharge outlet means through said wall means, the outer peripheral portions of said cavity means being bordered by substantially continuous, substantially planar mounting surface means on said wall means, discharge valve stanchion means integral with said wall means projecting axially outwardly therefrom within said cavity means in a direction substantially normal to the plane of said mounting surface means, said discharge valve means comprising discharge valve disc means having a discharge side and an inlet side, discharge valve disc seat means on the inlet side of said disc means, said discharge side of said discharge valve disc means having axially oriented bearing means thereon adapted to slidably engage axially oriented bearing means on said stanchion means for guided movement of said discharge valve disc means axially of said stanchion means, said discharge valve means further comprising discharge valve plate means having an inlet side and a discharge side and attached to said compressor intermediate said mounting surface means of said body means and said block means to provide closure means for said discharge chamber means, discharge port means formed through said plate means and comprising discharge port seat means in axial alignment with said discharge valve disc seat means, said discharge port means adapted to be closed by contact of said discharge port seat means with said discharge valve disc seat means, and compression spring means interposed between said discharge valve disc means and said body means and resiliently urging said disc means toward said discharge port means.