Abstract: A system for disconnecting a compressed air control system from a main supply line if the system is not used with a predetermined frequency. A normally closed solenoid-operated three-way reset valve is controlled by a normally open hand-operated switch which simultaneously operates a control valve in the system for a working cylinder. When the working cylinder valve is actuated, the three-way valve charges the operating chamber of a normally closed three-way air saver valve in series with the main line, thus opening the air saver valve. The operating chamber of the air saver valve discharges at a controlled rate through the reset valve when the latter returns to its closed position by opening the switch. If the operator closes the switch again before the pressure in the operating chamber is depleted, the air-saver valve is held open.