| 摘要 |
<p>A poppet valve is disclosed of the type in which a valve member located in a flow passage is biased to the closed position on a valve scat, and in which an electrical indication is provided, when the valve scats or unseats, by an indicator circuit which includes a current path through the valve and valve scat which is opened and closed by seating and unseating respectively of the valve. The valve construction includes a conductive rubber seal which insures a positive seal while allowing the passage of electric current for activating the indicator circuit. In one embodiment, a thin metal contact washer is used in conjunction with the rubber seal to enhance its conductivity the configuration of the contact washer allowing good scaling contact while greatly improving the contact conductivity. The indicator circuit activates an indicator device such as a panel light in response to the making or breaking of the current path caused by seating or unseating of the valve.</p> |
