Impeller pump flow regulation valve has a control spring with lengths having different spring constants so that the pump characteristic curve is linear, even at high flow rates

摘要

Pump valve (1) has a spring (3) whose length (4) varies in a way that is not proportional to the force (5) acting on it. The spring has at least two length regions (6, 8) with first and second spring constants (7, 9), with the first spring constant less than the second. The valve is designed as a flow regulation valve for an impeller pump. The first length range of the spring lies within an axial section of a control piston (14) configured as a guide pin in the valve hole (15) of a flow regulation valve (10).