Abstract: A firearm training device is structured for use with the user's firearm to provide realistic simulation of the firing, recoiling and re-cocking of the weapon, while enabling the use of the training device without modification to the firearm in order to accommodate the training device, the training device being receivable in the magazine compartment of the firearm and being easily removed therefrom.

Abstract: An automatic heat exchanger tempering valve designed to maintain a consistent temperature of a fluid within a machine. The tempering valve is configured to sense fluid temperature and in response, to proportion the flow of the fluid from the machine between a heat exchanger and an either internal or external by-pass flow circuit. The valve includes a movable valve diverter positionable in multiple positions to create a variety of proportionate flows of the total fluid flow stream between the heat exchanger and the by-pass flow circuit. The valve diverter is positioned by a multiple position valve actuator that changes the position of the diverter by reacting to a change in fluid temperature. The valve and the bypass flow circuit are easily installed within a motor vehicle by simply splicing into the two radiator hoses in the engine compartment.