| 摘要 |
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. |
