Amplifiers

Precision Control for Proportional Valve Systems

Hydraulic amplifiers are electronic devices used to boost control signals and convert them into precise driving currents or voltages for proportional hydraulic valves. These amplifiers are essential for achieving accurate, responsive control in systems using proportional directional or pressure valves, with or without electrical position feedback.

At Hydraulics Online, we supply hydraulic amplifiers from a wide range of global manufacturers – including Bosch Rexroth, Eaton Vickers, Sauer Danfoss and many others – with expert advice to help you select the right amplifier for your system’s configuration and control requirements.

Our website shows only a selection of what we supply. For impartial advice and access to our full range of hydraulic components, contact our expert team.

Amplifier -product category header - Bosch Rexroth image-For impartial advice and access to our full range of hydraulic components, contact our expert team.

A hydraulic amplifier receives a low-level input signal (voltage or current) and amplifies it to drive proportional solenoids in hydraulic valves. These solenoids regulate fluid flow or pressure based on the strength of the signal, enabling fine control over hydraulic functions.

Amplifiers are typically used to control:

Proportional directional valves – for variable flow direction and speed
Proportional pressure valves – for adjustable pressure regulation
Proportional flow control valves – for precise flow rate management

Some amplifiers also support closed-loop control with electrical position feedback, enhancing accuracy and repeatability.

Signal amplification – converts low-level control signals into valve-driving outputs
Ramp and step function generation – smooths transitions and compensates for overlap/underlap
Dither signal integration – prevents valve sticking and improves response
Feedback compatibility – supports position-controlled valves with displacement transducers
DIN-standard interfaces – ensures compatibility across multiple valve brands

These features make hydraulic amplifiers indispensable in automation, mobile hydraulics, and precision fluid control systems.

Industrial automation and robotics
Mobile equipment with proportional control
Marine and offshore hydraulic systems
Presses, injection moulding, and machine tools
Energy and process control systems

Whether you’re upgrading an existing system or designing a new one, amplifiers provide the control fidelity needed for modern hydraulic performance.

Do I need a specific amplifier for each valve type? Yes – amplifiers are matched to valve characteristics such as solenoid type, control method, and feedback requirements.

Can I adjust ramp times and dither frequency? Most amplifiers include potentiometers or digital interfaces for fine-tuning these parameters.

Are amplifiers compatible across brands? Many models follow DIN-standard interfaces, allowing cross-brand compatibility. We’ll help you confirm fit and function.