Stationary cylinder block 1 contains pistons 2 reciprocated by the driving swash plate 3 to which they are held by springs 6. Liquid is drawn in through ball valve 10 and discharged through ball valve 4. The body of the swash plate is hinged to drive shaft 5 and, by means of link 7, to sleeve 8 of pressure spring 9. In its rotation shaft 5 drives the body of the swash plate and spring 9 holds the body in the inclined position. As the pressure increases in the discharge line, plate 3 approaches its vertical position (perpendicular to the axis of the pump) and the pump delivery is reduced.
$3829$LHP,RP$