FIELD: engines and pumps.
SUBSTANCE: invention relates to production of pumps and can be used in piston pumps with magnetic drives. Pump has first working chamber (25, 125) and second working chamber (26, 126) separated by piston (7). Said two chambers are communicated via fluid channel (28). Bypass valve (9, 109) to allow fluid flow of first chamber (25, 125) to second fluid chamber (26, 126) is located on said channel (28). Check valve (14, 130) is arranged in the area of transition between inlet channel (13) and second working chamber (25) or in transition between working chamber (26, 126) and discharge channel (19). Magnetic drive armature is rigidly coupled with piston (7). Pre-stressed return means (8, 22) corresponds to selected setting pressure in discharge channel (19) to be set by shifting of spring static spring seat (23, 29).
EFFECT: perfected design.
21 cl, 3 dwg
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