Patent ID: 9453518
Filing Date: 2016-09-27
CPC Classification: F15B,G05D,Y10T

Claim Text:
1. A proportional pressure-regulating valve, comprising: a valve housing having at least a pump port, a utility port and a tank port in said valve housing; a regulating piston movably guided longitudinally in said valve housing selectively to connect said pump port with said utility port and to connect said utility port with said tank port, said regulating piston having an outer circumference; a magnetic coil device mechanically coupled to and controlling movement of said regulating piston such that said regulating piston and said magnetic coil device move together in said valve housing by a magnetic force, said magnetic coil device generating the magnetic force when electrical current signals are applied to said magnetic coil device; and a surface transformation on said regulating piston that builds up pressure at said utility port and generates a counterforce opposing the magnetic force of said magnetic coil device to move said regulating piston back such that an inflow of pressurizing medium from said pump port to said utility port is reduced long enough that pressure at said utility port is equivalent to the magnetic force and to a preset pressure value representative of the current signals applied to said magnetic coil device, said surface transformation being formed by different diameters on said outer circumference of said regulating piston to form a step on said regulating piston, said step extending between said utility port and said tank port in each movement position of said regulating piston.