| 摘要 |
<p>Solenoid operated condensate drain valve arrangements for steam systems are described having the following features: (a) powered by electromotive force obtained by the Seebeck effect; (b) where electrical sensing probe means control operation of the arrangement, the provision of thermal switch means overriding the action of the probe means and enabling air to escape from the system under start-up conditions; (c) provision of a monitoring circuit that allows escape of trapped steam which may be having a steam locking effect; (d) provision of a monitoring circuit that gives a measure of automatic drainage in the event of some failure in the drain valve arrangement.</p> |
