Abstract: A check valve's housing has a valve disposed therein to open or close a flow path from the housing's inlet to its outlet based on a difference between pressures at the inlet and outlet. The valve includes a bellows, a poppet, and a spring. The poppet includes a hollow structure extending through the poppet's plate and terminating in a first open end disposed within the bellows, an annular flange between the second face of the poppet's plate and the housing's outlet, and an open-ended tube extending from the annular flange into the housing's outlet. The spring, disposed within the hollow tubular structure, positions the annular flange to seal the outlet when the pressure difference is less than a predetermined amount and compresses when the difference exceeds the predetermined amount wherein the annular flange is unsealed from the housing's outlet to open the flow path.

Abstract: A reaction system for use in combination with a fluid-powered wrench tool in assembling or disassembling large size tube fittings of a variety including a fastener or nut which is threadably engagable with a port end of the fitting body. The system includes a reaction member attachable to the tool as extending along a central longitudinal axis disposed general parallel to the line of action of the cylinder assembly of the tool from a forward end face positionable in confrontation with the fastener to an opposite rearward end face. The system also includes an associated wrench member which is provided as having a rearward shank end mountable to the reaction member and a forward jaw end configured to receive the external surface of the fitting body in an engagement which delimits the rotation of the fitting body in a first direction about the axis of rotation of the fitting fastener.