151969-A is referenced by 2 patents.
151,969. Deutsche Maschinenfabrik Akt.-Ges., (Assignees of Meyer Akt.-Ges. f r Maschinen-und Bergbau, R., and Strucksberg, P.). March 9, 1914, [Convention date]. No Patent granted (Scaling fee not paid). Fixed-abutment type; regulating pumps. - A regulating-device for a rotary pump of the type having outwardly-sliding vanes 3, which compress air into a reservoir 5, comprises two pistons 9, 10 adapted when a certain pressure is reached to close a throttle valve 8 in the suction pipe E and to open a relief valve 7 in the delivery pipe A. Air for cooling may be allowed to enter the pump through a hole 12 in the throttle valve 8. One piston may be used to actuate both valves 7, 8. The piston 10 may itself function as the throttle valve.