Abstract: A die cylinder assembly is designed for use in an environment which has contaminants outside the assembly. The die cylinder assembly includes a piston disposed in a cylinder and having an outer end surface. The piston is moved in one direction by forces applied to the outer end surface of the piston. The piston is moved in an opposite direction by a working fluid pressure in a head end chamber of the cylinder. The cylinder includes a rod end variable volume chamber which is connected in fluid communication, through a first passage in the piston rod, with a third chamber located in the piston rod. The fluid pressure in the rod end chamber is always maintained at least as great as ambient fluid pressure to prevent contaminants from entering the rod end chamber. A check valve in a second passage admits outside air to the third chamber when fluid pressure in the third chamber drops below ambient pressure. A relief valve vents the third chamber if fluid pressure therein becomes too high.

Abstract: The disclosure relates to an improved temperature responsive control arrangement. It includes a valve member, a chamber, and a bellows disposed in said chamber for controlling the position of the valve member in response to the temperature of fluid flowing through the chamber. The arrangement is particularly suited for use in steam traps. There are surfaces in the chamber for distributing fluid flowing through the chamber around the bellows to promote rapid expansion and contraction of said bellows with changes in temperature of the fluid flow through said chamber. The chamber has an outlet centrally located at one end thereof, and the distributing surfaces include a plurality of fluid inlets at the end of the chamber opposite from the outlet, the fluid inlets being distributed about the periphery of the chamber.