Abstract: In a gas-liquid receptacle that holds liquid in contact with pressure gas and has a concentric liquid port in its flat bottom wall, liquid inflow is controlled, to prevent foam generation, by a baffle disc and a screen, both over the liquid port. The baffle disc, which diverts liquid entering the liquid port into decelerating radially outward flow, is at least as big as the liquid port but small enough to be well spaced from the side wall of the receptacle, and it is spaced above the bottom wall by a distance preferably equal to 3/8 of the liquid port diameter. The screen extends entirely across the receptacle and is spaced above the baffle disc by a distance preferably about 50% greater than the distance from the bottom wall to the baffle disc.

Abstract: For maintaining a predetermined pressure at a controlled pneumatic device, a unit of this invention has a body with an inlet port connectable with a pressure gas source, an outlet port connectable with said device, a pressure chamber at all times communicated with the outlet port, and an annular valve seat through which gas can flow from the inlet port to the pressure chamber. The position of a valve element that throttles gas flow through the valve seat is controlled by a diaphragm having one surface exposed in the pressure chamber and a helical compression spring having an inner end bearing against the opposite diaphragm surface. A cam rotatably supported on the body controls the position of the other end of the spring, for quick stepless adjustment of spring preload and thus of outlet port pressure. An eccentric bushing enables calibrating adjustment of the position of the cam axis for either a maximum or a minimum outlet port pressure.