A servo valve is a high-precision electrohydraulic control valve that converts a small electrical command into accurately regulated hydraulic flow, pressure, or direction. It typically uses a torque motor or force motor, pilot stage, metering spool, and internal or external feedback to achieve very fine control.

Servo valves are designed for fast dynamic response, low hysteresis, high resolution, and repeatable closed-loop performance. They are used in motion-control, testing, forming, marine, aerospace, and heavy industrial systems where actuator position, velocity, force, or pressure must be controlled with exceptional accuracy.

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Products Functions

Functions of the Servo Valve

Hydraulic Parts for All Construction Machinery

Translate Electrical Commands into Hydraulic Control

The servo valve receives a low-power electrical signal from a controller and converts it into movement of the hydraulic metering element. This allows electronic control systems to command powerful hydraulic actuators without mechanically operating the main flow path.

Meter Flow with High Precision

Small, controlled spool movements vary the valve opening and accurately regulate flow to the actuator ports. Precise metering enables smooth changes in cylinder velocity or motor speed and supports demanding motion profiles with fine resolution and minimal dead band.

Control Actuator Position, Speed, Force, or Pressure

When combined with position, velocity, force, or pressure sensors, a servo valve becomes part of a closed-loop control system. The controller continually corrects valve output so the hydraulic actuator follows the required command despite changing loads or disturbances.

Provide Fast Dynamic Response

The lightweight pilot components and optimized hydraulic stages allow a servo valve to respond rapidly to changing electrical input. High bandwidth helps test rigs, simulators, presses, and precision machinery reproduce fast movements, vibration profiles, and transient loads accurately.

Maintain Repeatable Bidirectional Motion Contro

A four-way servo valve can meter supply and return flow to both sides of a hydraulic actuator. Controlled bidirectional flow provides stable acceleration, deceleration, reversal, and holding behavior while minimizing overshoot and improving repeatability across operating cycles.

Uses

Servo Valve Uses

Construction Machinery

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Servo valves support advanced active suspension, electrohydraulic steering, testing, and precision attachment control in specialized construction machinery.

Agriculture Industry

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Servo valves support agricultural machinery steering, implement positioning, hydraulic suspension, and precision control systems that require fast response, accurate flow control, and smooth operation.

Marine & Ship Equipment

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Servo valves provide accurate control for marine steering, stabilizers, deck systems, propulsion testing, and motion-simulation equipment.

Mining Equipment

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Servo valves can regulate high-precision test stands, automated supports, and specialized motion-control systems used with mining equipment.

Plastic & Metallurgy Industrial Machine

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Servo valves control position, speed, force, and pressure in injection molding machines, rolling mills, presses, and metallurgy industrial equipment.

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Help Center

How does a hydraulic servo valve work?

A servo valve converts an electrical command into controlled movement of a pilot element and metering spool. The resulting port openings regulate hydraulic flow and pressure to an actuator, while mechanical or electrical feedback improves accuracy and stability.

What is the difference between a servo valve and a proportional valve?

A servo valve generally offers higher response, resolution, and closed-loop precision, but it is also more sensitive to contamination and often more expensive. A proportional valve is usually more robust and economical for applications that do not require servo-level performance.

Why is fluid cleanliness critical for a servo valve?

Servo valves contain very small clearances and precision metering edges. Contamination can obstruct pilot passages, cause spool sticking, increase leakage, damage surfaces, and change null or response, so fine filtration and strict oil-cleanliness control are essential.

What information is needed to select a servo valve?

Specify rated flow, pressure, port configuration, command signal, frequency response, hysteresis, threshold, internal or external pilot supply, feedback type, fail-safe behavior, fluid, filtration level, temperature, mounting pattern, and required position, velocity, force, or pressure performance.

Can you customize products, and is there a minimum order quantity?

Absolutely. We provide OEM/ODM services and can manufacture according to your samples or technical drawings. Yes, there is a minimum order quantity, but it is flexible. Spare parts often have an MOQ of 1 piece, while complete pumps or motors vary by model—please inquire for details.

How quickly can you deliver products, and what shipping methods are available?

For in-stock items, we can ship within 3 days. For custom or non-stock items, delivery usually takes 7–15 days. We’ll confirm exact timing based on current inventory. We offer flexible shipping via express carriers (DHL, FedEx, UPS) and sea freight (CIF/FOB). We can also deliver to your designated freight forwarder in China.

Are you a factory or a trading company, and how do you ensure product quality?

We are a hybrid—both a manufacturer and a trading company. We produce our own products and also source specific components to offer complete solutions. We follow strict quality control protocols. All parts undergo CNC machining and heat treatment, and each is 100% tested before delivery to guarantee precision and reliability.

What payment methods do you accept, and what is the warranty period?

We accept T/T, L/C, Western Union, Alibaba Trade Assurance, and VISA. For new customers, we usually require full prepayment or a 30% deposit with the balance due before shipment. All products come with a 1-year warranty, provided they are installed and operated under normal conditions.