Abstract: A sliding member operating system is disclosed which includes a adjustable pressure regulator (18)fluid control valves (15), (40), (50), (30), (80), (20), and (70) and an operating cylinder (60) which is mounted to the sliding element of a door or window (66) and its adjacent frame (62) for the purpose of opening and closing and holding said sliding element. This system utilizes the fluid being exhausted from cylinder (60) during the closing cycle to hold open valve (30) insuring that a door or window in motion will continue to stay in motion but that the power being supplied to a moving door or window, once halted by any means, will cease. An additional series of valves is utilized to pressurize cylinder 60 for the purpose of holding a door or window in the closed position. The rate of fluid bleed at valve 50 is adjustable to control closing speed and the sensitivity at which the sliding element will stop if an object is encountered during the closing cycle or if the door/window closes completely.

Abstract: A door operating system is disclosed which includes a remotely or manually controlled fluid supply system (10) which pressurizes a reciprocable striker release assembly (50), and activates an opening cylinder assembly (30) functionally mounted to a door (17) and door frame (18) for opening the door.