Abstract: A coolant control valve assembly for an automatic welding gun. The assembly includes a manifold having a supply passageway and a return passageway for respectively supplying coolant to and receiving coolant from the welding gun. A controller is used to control the supplying of coolant and is coupled to a sensor which detects a reduction in coolant flow through the manifold relative to predetermined flow rate. A check valve is located in the return passageway of the manifold and closes in response to reduced flow.

Abstract: A modular terminal block assembly having removable terminal block modules which may be individually removed without total disassembly. The base portion of each module has a transverse slot open to the bottom, through which retaining rods pass. Each module also has raised portions around the slots on one side and recessed portions around the slots on the other side of the base portion of the module. The rim portions and recessed portions coact to retain modules placed together in side by side relation. To remove a module, the retaining rods passing through the slot are loosened sufficiently to disengage the rim from the recessed portion of the module, and the individual module is then lifted out of the assembly, the downwardly open slots allowing removal from the retaining rods.