FIELD: engines and pumps.
SUBSTANCE: air-operated valve system of piston pump 5 exploits assemblies of plate valves 40 driven by piston 10 to control the shift of the primary cir control valve. Air released from air control valve is forced (50) directly in atmosphere, not via the primary discharge channel. Skewed thrust 32 prevents locating air control valve at the center.
EFFECT: higher reliability.
4 cl, 12 dwg
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