| 摘要 |
A reverse-acting relay valve which employs a pressure responsive diaphragm driving an operably related pin. The pin contacts a throttling ball, moving it up and down as the diaphragm moves up and down. The diaphragm moves down with an increase in pressure and up with a decrease in pressure. Movement of the ball in the downward direction is limited by a supply seat, and movement of the ball in the upward direction is limited by an exhaust seat. When the ball is in its downward position, thus resting on the supply seat, flow through the relay is cut off. When the ball is in its upward position, thus against the exhaust seat, flow through the relay is at its greatest. When the ball is between the supply seat and the exhaust seat, some flow through the relay passes through the exhaust seat to a vent.
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