| 摘要 |
A valve assembly controls a vacuum. The valve assembly includes a poppet valve operatively connected to the vacuum. The poppet valve is movable between an open state and a closed state to turn the vacuum on and off respectively. A pilot valve is fixedly secured to the poppet valve to selectively move the poppet valve between its open and closed states. The valve assembly also includes a bladder system for controlling the pilot valve such that the pilot valve moves the poppet valve to the open position only when the bladder system measures a reduced suction force created by the vacuum to force the vacuum to increase the suction force produced thereby. |
