Abstract: A portable squeeze chute apparatus. The apparatus includes a chute having opposing sidewalls, an entrance end and an exit end. The sidewalls are selectively pivotable toward one another in order to inhibit lateral movement of an animal positioned in the chute. Movement of the sidewalls is actuated through a control chain which is connected to the sidewalls through a mechanical linkage. The control chain is selectively latched in position by a lock which is pivotally connected to the chute. The lock includes a tubular body through which the control chain passes. The tubular body includes a notch which selectively engages the control chain. A tailgate having interconnected door sections is mounted on the entrance end of the chute for selectively admitting an animal to the chute The tailgate and the sidewall squeezing mechanism include special mountings and bumpers which are adapted to reduce noise generated by operation of the apparatus.

Abstract: An unloader system is provided for a reciprocating gas compressor having a cylinder, a piston reciprocably mounted in the cylinder, a rotatable crankshaft connected to the piston, a suction valve assembly, and a discharge valve assembly for selectively communicating suction and discharge lines with the compressor cylinder. An unloader valve assembly including a valve seat structure, valve guard, and multiple poppet valve members is provided to allow selective communication between the compressor cylinder and a clearance bottle. The opening and closing of the unloader valve assembly is controlled by manipulating a control pressure acting through a manifold against the stem ends of the poppet valve members by means of a pressure regulator connected in series with a pressure source. When the pressure in the compressor cylinder acting on the heads of the poppet valve members exceeds the control pressure acting on the stems, the poppet valve members open, partially unloading the compressor.