Common hydraulic valves - the proportional pressure valve

Proportional valves are commonly used to control pressure to a cylinder or hydraulic motor. They provide infinite spool positioning and thus infinitely adjustable flow volumes. The resulting flow or pressure output is proportional to the input change, i.e. triple the input produces triple the output.

They are controlled electronically either by sending a voltage (10V to 10V) or current signal (420mA) to the valve depending on model of valve. The electrical signal supplied to the solenoid coils creates a variable force that overcomes a spring force and shifts the main spool enough to allow supply pressure (P) to flow to port A or B.

Example proportional valve

For example, if solenoid B receives a signal, it shifts the main spool to the left, allowing oil to flow to and increase pressure in port A. Radial drillings in the main spool allow some oil to go to the left side of piston sensor 1. Oil in this area and in port A combine to work against the force of solenoid B until equilibrium is reached. If port A increases more than solenoid B&#;s force, the main spool will shift to the right and allow some of port A&#;s oil go to the tank.

For more information on maintaining your hydraulic system, contact your Valmet representative.

Hydraulic cartridge valves control the direction, flow, and pressure of the oil in the hydraulic system of a machine. Their compact size and flexibility make them an excellent choice for motion control applications on mobile equipment. Cartridge valves are screwed or flanged into a hydraulic manifold block to create a main control unit or Hydraulic Integrated Circuit (HIC).

They offer low leakage, easy maintenance and multiple design options. Hydraulic control circuits using cartridge valves can be modified to handle more functions, higher or lower flows or pressure by simply updating the size or design of cartridges in the manifold. Automated electronic control can easily be added to solenoid or proportional cartridge valveproportional cartridge valves by attaching a valve driver or wiring an electronic control unit to the coil.

As the world&#;s leading maker of hydraulic cartridge valves, HydraForce offers more than 2,000 standard valve models and an equivalent number of customized, proprietary cartridge valve products for Original Equipment Manufacturer (OEM) use.

They are controlled electronically either by sending a voltage (10V to 10V) or current signal (420mA) to the valve depending on model of valve. The electrical signal supplied to the solenoid coils creates a variable force that overcomes a spring force and shifts the main spool enough to allow supply pressure (P) to flow to port A or B.

Example proportional valve

For example, if solenoid B receives a signal, it shifts the main spool to the left, allowing oil to flow to and increase pressure in port A. Radial drillings in the main spool allow some oil to go to the left side of piston sensor 1. Oil in this area and in port A combine to work against the force of solenoid B until equilibrium is reached. If port A increases more than solenoid B&#;s force, the main spool will shift to the right and allow some of port A&#;s oil go to the tank.

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For more information on maintaining your hydraulic system, contact your Valmet representative.

Hydraulic cartridge valves control the direction, flow, and pressure of the oil in the hydraulic system of a machine. Their compact size and flexibility make them an excellent choice for motion control applications on mobile equipment. Cartridge valves are screwed or flanged into a hydraulic manifold block to create a main control unit or Hydraulic Integrated Circuit (HIC).

They offer low leakage, easy maintenance and multiple design options. Hydraulic control circuits using cartridge valves can be modified to handle more functions, higher or lower flows or pressure by simply updating the size or design of cartridges in the manifold. Automated electronic control can easily be added to solenoid or proportional cartridge valves by attaching a valve driver or wiring an electronic control unit to the coil.

As the world&#;s leading maker of hydraulic cartridge valves, HydraForce offers more than 2,000 standard valve models and an equivalent number of customized, proprietary cartridge valve products for Original Equipment Manufacturer (OEM) use.

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