a pressure regulator controllable by a proportional magnet includes a valve box with a primary , secondary and deaeration coupling and two valves coaxial with each other and movable in the valve box and controlled by the setting force . the first valve controls a cup - shaped valve seat provided in the valve box for connecting the primary side to the secondary side , and closes it in the rest and deaeration positions , but opens in the working position . the second valve is applied , in the rest and working positions , on a seat surface of the first valve , and prevents any deaeration by the valve in the direction of the deaeration coupling , but in the deaeration and separation positions , clears the passage between this valve and the deaeration coupling . the valve seat surface and the valve surface which cooperates with the cup - shaped valve seat in the valve box are situated in a common diametrical plane and the seat surface is surrounded by the valve surface . the second valve includes , at its end facing the seat surface of the first valve , a second cup - shaped valve seat for bringing the second valve in substantially linear engagement with the seat surface of the first valve surface , and the outer diameter of the second cup - shaped seat corresponds to the inner diameter of the cup - shaped seat of the valve box .