Servo Valve for Rolling Mill Hydraulic Screwdown Systems

Product Specifications

Technical details and manufacturing context for Servo Valve

Definition

This servo valve is a component used in basic metal manufacturing, specifically within a heavy-duty rolling mill hydraulic screwdown system. Its function is to precisely control the position, speed, and force of hydraulic actuators by translating low-power electrical signals from the mill's control system into high-power hydraulic fluid flow. This enables accurate and rapid adjustments of the roll gap during metal forming operations. The valve operates using a torque motor or solenoid to position a spool or flapper based on an input current, opening or closing precise orifices to direct high-pressure fluid to one side of an actuator cylinder while allowing return flow from the other, thereby controlling actuator motion proportionally to the input signal. Materials on file include alloy steel and stainless steel. Key parameters include a flow capacity of 4–60 L/min at a rated pressure drop of 7 MPa per land (ISO 10770-1), an operating pressure range of 1.0–31.5 MPa (ISO 10770-1), a supply voltage of 24 V DC ±10% (optional ±15%), a control signal of 4–20 mA (or ±10 V DC), hysteresis ≤0.5% of rated current (ISO 10770-1), linearity ≤1.0% of rated flow (ISO 10770-1), step response time of 5–15 ms for 0–100% stroke, temperature range of -20–85°C, ingress protection IP65 (IEC 60529), body material 304 SS (optional 316L, ASTM A276), and weight 2.5–4.0 kg depending on size. These values are directory reference ranges and must be confirmed for the actual model and application. Standards listed are for procurement and verification reference only, not proof of certification or compliance. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The servo valve uses a torque motor or solenoid to position a spool or flapper based on an input current. This movement opens or closes precise orifices, directing high-pressure hydraulic fluid to one side of an actuator cylinder and allowing return flow from the other, thereby controlling the actuator's motion proportionally to the input signal. The valve's internal feedback mechanism ensures accurate positioning, and the response time is typically 5–15 ms for full stroke. The valve operates within a pressure range of 1.0–31.5 MPa and requires a supply voltage of 24 V DC. The control signal can be 4–20 mA or ±10 V DC, and the valve exhibits low hysteresis and linearity errors, ensuring precise control in rolling mill applications.

Common Materials

Alloy Steel, Stainless Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Capacity	4–60 L/min	At rated pressure drop 7 MPa per landISO 10770-1
Operating Pressure	1.0–31.5 MPa	Below 1.0 MPa seat load insufficientISO 10770-1
Supply Voltage	24 ±10% V DC	Optional ±15% available
Control Signal	4–20 mA	Or ±10 V DC
Hysteresis	≤0.5 %	Of rated currentISO 10770-1
Linearity	≤1.0 %	Of rated flowISO 10770-1
Step Response Time	5–15 ms	0–100% stroke
Temperature Range	-20–85 °C	Fluid temperature
Ingress Protection	IP65	With mating connectorIEC 60529
Body Material	304 SS	Optional 316LASTM A276
Weight	2.5–4.0 kg	Depends on size

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Torque Motor
Converts the electrical input signal into a mechanical torque to initiate spool movement.

Material: Electrical Steel, Copper
Spool Part
The sliding cylindrical part that precisely meters hydraulic fluid flow by opening and closing ports in the valve body.

Material: Hardened Alloy Steel
Valve Body
Houses the internal components and provides the fluid flow passages and mounting interface.

Material: Steel or Ductile Iron
Feedback Device (e.g., LVDT)
Measures the actual spool position and provides a feedback signal to the controller for closed-loop operation.

Material: Various (Electrical Components, Steel)

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hydraulic Gap Control

View system integration details

Manufacturers of Servo Valve

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Frequently Asked Questions

What is the function of this servo valve in a rolling mill?

It precisely controls the position, speed, and force of hydraulic actuators in the screwdown system, enabling accurate roll gap adjustments during metal forming.

What are the typical operating pressure and flow capacity?

The operating pressure range is 1.0–31.5 MPa, and flow capacity is 4–60 L/min at a rated pressure drop of 7 MPa per land, per ISO 10770-1. Confirm for your specific model.

What control signals does the valve accept?

It accepts a 4–20 mA current signal or ±10 V DC voltage signal, with a supply voltage of 24 V DC ±10% (optional ±15%).

What standards apply to this valve?

Relevant standards include ISO 10770-1 for performance, IEC 60529 for ingress protection, and ASTM A276 for body material. These are references for verification, not certification.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 350 bar (5000 psi)
flow rate:	0.5 to 200 L/min
temperature:	-40°C to +120°C
slurry concentration:	Not suitable for slurries; maximum particle size < 5 μm for clean fluids

Servo Valve

Product Specifications

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