an expansion valve for a refrigeration system , and in particular , for a reversible flow or heat pump application is provided in which the valve is electrically operated by a heat motor mounted to a valve body . the valve includes a valve stem operatively connected to the heat motor . the valve stem position , and consequently , valve operation , is controlled by heat motor operation . because of the reverse flow nature of the fluid flow in the system described , means for protecting the heat motor from fluid leakage is necessary , if the valve is to function properly . the valve of this invention includes bleed or drain means positioned to drain fluid from the heat motor , and seal means on the valve stem of the valve to reduce flow leakage along the stem .