US Patent 10201723 Dry pipe/deluge valve for automatic sprinkler systems

A dry pipe valve includes a main chamber having an input port and an output port, a clapper assembly installed in the main chamber, a pushrod, a pushrod chamber, and a dry valve actuator. The clapper assembly includes a clapper that seals the input port of the main chamber, and a hinged lever that holds the clapper in a closed position or allows the clapper to open. Based on a pressure of a control fluid in the pushrod chamber, the pushrod moves to urge the hinged lever against the clapper to hold the clapper in the closed position, or to release the hinged lever and thereby allow the clapper to open. The dry valve actuator is attached to a housing of the pushrod chamber and controls the pressure of the control fluid in the pushrod chamber.