| 摘要 |
<p>Disclosed is an electrically operated condensate drain valve arrangement for draining condensate from a fluid transfer system, the arrangement comprising a condensate drain valve (3), an electronic circuit (5 or 21) for controlling operation of the valve, and at least one sensing element (1 or 19 and 20) for insertion in the fluid transfer system to trigger the electronic circuit for operating the valve when a predetermined condition in the system is sensed by the sensing element; the electronic circuit including a delay means (10) imparting a desired minimum period between successive particular operations of the valve. In one use the predetermined condition is that condensate level is below the sensing element and the circuit is triggered to close the valve when this condition is sensed. In another use, in a steam system, there are two temperature sensing elements at high and low levels respectively and the predetermined condition is when steam is at both these levels, the circuit being triggered to close the valve when this condition is sensed. Use in a compressed air system is also described. In all cases the successive particular operations occurring with the desired minimum period between each are valve opening operations, and the delay means is a timer integrated circuit.</p> |
