Pilot-shifted proportional valves are used when you want to regulate flow or pressure continuously in proportion to a hydraulic control signal. The valve’s displacement is proportional to the control signal, hence the name of the valve. They are used to control cylinders and motors and are available in normally closed (NC) and normally open (NO) positions. There are also valves with a 3/2 function, which are used to divert flow when the valve is in its neutral, unactuated position.
2 ports, electro-proportional relief valve – pilot capacity, high pressure setting with no command
3 way, 2 position, pilot operated
3 way, 3 position, pilot operated. Please note, the valves are no longer available. For replacement, please contact one our sales engineers.
3 way, 3 position, pilot operated, center bleed down. Please note, the valves are no longer available. For replacement, please contact one our sales engineers.
3 way, 3 position, pilot operated, center bleed down, load sense. Please note, the valves are no longer available. For replacement, please contact one our sales engineers.
4 ports, 3 position, pilot operated, proportional valve
4 ports, normally closed proportional throttle pilot shift
4 ports, direct acting reducing/relieving, main stage 3-way real 0-pressure, high accuracy
Pilot-shifted means using hydraulic pressure, from a pilot line, to control the function of a valve or other component. This type of control may be preferred over electric control in applications where the environment is demanding, such as in explosive, damp, or very dirty environments where electrical components risk being damaged or causing hazardous situations. Additionally, hydraulic control offers a robust and reliable solution with fast response, which is advantageous in systems where reliability and durability are prioritized.
The choice between a normally closed (N/C) and a normally open (N/O) valve often depends on how the system is intended to behave in the event of an unexpected power failure. If the function should shut down for safety reasons when power is lost, a normally closed (N/C) valve is preferred. Conversely, if the function should remain active—for example, to prevent overheating in a fan control system—a normally open (N/O) valve is the better choice.
A 3/2 valve functions as a selector valve and features three ports: one inlet and two outlets. A common configuration involves port 1 (inlet) switching between port 2 or port 3 (outlets). Depending on the valve position, this setup allows pressure and flow to be directed to two different functions—for example, two separate cylinders or actuators. This provides a simple and efficient method of switching between functions in a hydraulic system, without the need for multiple individual valves.
Proportional valves are well suited for a variety of applications, such as pressure regulation in hydraulic presses. They are also used in forestry machines, excavators and cranes, where smooth movement and precise positioning of booms and attachments are essential. Other common applications include speed control of hydraulic fans as well as control systems in test equipment and simulators. Need help choosing the right component for your hydraulic system? Contact us, and we will help you find the best solution for your needs.
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