S14 Two Stage Servo Valve

Introducing the world’s smallest NG25 Servo Valve

Customise your valve to your specifications


The Domin S14 offers a compact alternative for NG25 applications

The S14 redefines the art of the possible for a high flow Servo Valve.  It’s compact size belies a flow performance that competes with many larger two and three stage valves. This performance is achieved with a minimum power draw and leakage loss. The S14 is the valve of choice where size, efficiency and low electrical power consumption are valued.

Rated Flow

Up to 1,000 lpm (at 70 Bar ∆P)

Maximum Flow

2,000 lpm

Frequency Response

> 100 Hz (-3 dB, up to +/-25 % FS)


< 0.1 %

Power Consumption

< 1 W at rated flow


< 4.0 kg

Two Stage Valve Concept

The S14 gains its advantage from using the Domin rotary valve to act as a first stage of a two stage valve. The first stage is sufficiently compact to be packaged within the envelope of the primary spool. A number of patents cover the features that have led to the design success of the S14. A metallic membrane provides a fluid barrier separating the rotating elements of the first stage valve from the electrical elements of motor and transducer. The configuration removes the need for internal rotary and high pressure seals.

Design enabled by the revolution of Additive Manufacturing

To solve the inherent challenges of the two stage valve concept, Domin engineers have had to use the full design freedom afforded by AM. It has resulted in a unique patented concept employing an integrated rotary direct drive valve as the first stage. The result is a valve with elegant simplicity using the minimum of component parts.

Innovation in Design

The remarkable valve performance has been the result of many thousands of hours of analysis, using the latest finite element and computational fluid dynamic tools. Product reliability is assured through thousands of hours of development testing together with a full fatigue evaluation of each deliverable valve.

Innovation for Performance

Domin have brought together the key benefits of a rotary motor drive, rotary valve and Additive Manufacturing to create an exciting blend of performance and size surpassing all other servo valve technologies.

Low Power Consumption / High Dynamics

Domin has been able to achieve exceptional performance and low power consumption. It sets a new industry benchmark in terms of bandwidth over the full operating range of amplitudes.

Low Internal Leakage

The valve employs Domin’s patented rotary valve technology to achieve exceptional dynamic performance with minimal internal leakage. The total on centre leakage for the axis cut valve is typically less than 1 % of maximum flow.

Unsurpassed Power to Weight

The 1000 lpm version (@70 bar ∆P) weighs only 4.0 kg and occupies a volume of less than 2 ltr. It can achieve a bandwidth in excess of 100 Hz at up to 50 % input command.

Custom Configure to Your Specification

Our online configuration tool allows you to tailor each valve to your particular requirements. Flow-gain and valve lap condition can be set precisely to your needs using our unique sliding scale. Additionally, key interfaces can be chosen from a comprehensive range of alternatives.

Free delivery on all orders

Domin offer express shipping on standard valves

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