FIELD: engines and pumps.
SUBSTANCE: switching mechanism for these pumps comprises shaft (21) fitted to slide in bores (22) at opposite surfaces of dual diaphragm chambers (23). Ring-like recess (24) is made at the centre of shaft (21) between two diaphragm chambers (23) to receive lever (25) extending from U-shape carcass (26). The latter is articulated with the top of valve plate (27) with bores (28). Valve closing component (29) is arranged opposite the surface of valve plate (27). This component can slide across said surface for selective closure of multiple holes (28). Valve closing component (29) is retained at working position by wire pusher (30) hinged in grooves (31) arranged parallel with extension of U-like carcass (26). Linear expansion springs (32) connect hinged wore pusher (30) with U-like carcass (26). Springs (32) shift valve closing component (29) opposite aforesaid valve plate (27) to out-of-centre position.
EFFECT: higher reliability.
11 cl, 5 dwg
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