TIGHT VOLUMETRIC PUMP Russian patent published in 2011 - IPC F04C2/00 F04C14/24 

FIELD: engines and pumps.

SUBSTANCE: tight volumetric pump has housing 1 with suction and discharge channels 2 and 3, working member of volumetric displacement, magnetic coupling, drive motor 9, safety bypass valve containing housing 10, spring-loaded locking element with seat, and adjusting screw. Between adjusting screw and spring-loaded locking element there located is bellows with stop inside it, one end of which is rigidly fixed on the side of adjusting screw on the stop, and the other one - on housing 10 of valve.

EFFECT: creating the tight volumetric pump having high tightness and reliability degree, which allows performing the adjustment and correction of working pressure of safety valve during the pump operation.

2 dwg