Abstract: A piston rod to crosshead mounting for use in reciprocating compressors having a crosshead nut bearing a plurality of diametrically opposed threaded jackscrews each having a bearing pad cooperating with the adjacent crosshead mounting boss face. The bearing pads are swivelably mounted to the jackscrew to permit the bearing pad to adjust to any out-of-squareness of the crosshead mounting surface. The construction permits the bearing pads to operate independently of each other while applying full preload to the piston rod.

Abstract: A seat guided poppet valve for fluid compressors and the like having improved flow directing characteristics provided by a poppet element having integral flutes surrounded by a shroud and variable dampening provided by adjustable seals or dashpots. The dashpot may reciprocate with the poppet element or be constrained within the guard. A seat seal is established by conventional abutment of the poppet element head surface with the seat outlet port seating surface, or by eliminating that portion of the poppet element head overhanging the seat outlet port so that the circumferential surface of the head makes a sliding seal with the inner surface of the seat bore. Additional sealing may be provided by a resilient ring entrained within a groove inscribed in the circumferential surface of the poppet element head, or by constructing the circumferential surface of a resilient material which deforms as the head enters the seat bore. Lift washers are provided to control the amount of valve lift.