Control system for vane and other displacement pumps has a thickened section at the control pin to prevent temporary increase in the pumped volume/pressure on a rapid acceleration

摘要

The control system, for displacement pumps, has a control pin (27) with a thickened section (34) in a cylindrical or truncated cone shape in an axial setting zone of the throttle (20). It gives a minimum diaphragm cross section when the flow control piston (21) has yet to give a flow control action. The control pin (27) is bonded to the flow control piston (21), and the throttle drilling (28) is fixed at the housing.