Electro Hydraulic Servo Valve Product & Companies in Vietnam

Featured Electro-Hydraulic & Sensor Components

Speed Sensor SZCB-01

High-precision sensor for measuring rotational speed, displacement, and mechanical vibration in heavy turbines.

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LVDT Sensor TDZ-1E-32

Linear Variable Differential Transformer designed for accurate turbine governor stroke & EH valve feedback.

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Hydraulic System Filter Differential Pressure Transmitter

Pressure Transmitter CS-V

Monitors differential pressure across fluid filters to maintain strict EH system fluid cleanliness standards.

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760N1194B Servo Valve

Ultra-responsive electro-hydraulic control valve for steam turbine governor systems and heavy actuators.

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Overview of Electro Hydraulic Servo Valves in Vietnam's Industrial Landscape

The industrial economy of Vietnam is experiencing unprecedented expansion, driven by massive investments in power generation, metallurgy, oil & gas, and heavy manufacturing. As automated systems become the backbone of modern facilities across key industrial hubs like Hai Phong, Quang Ninh, Da Nang, and Binh Duong, the demand for high-reliability motion control components—specifically Electro Hydraulic Servo Valves (EHSVs)—has surged significantly.

Electro Hydraulic Servo Valves act as the primary interface between low-power electrical control signals and high-power hydraulic output systems. In modern steam turbine control systems, hydroelectric governor systems, steel rolling mills, and offshore drilling platforms, servo valves provide dynamic response, millimeter-accurate position control, and fast closed-loop control indispensable for operational safety and efficiency.

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Thermal & Hydro Power Generation

Under Vietnam's Power Development Plan 8 (PDP8), grid stability relies on rapid-response steam and water turbine governors driven by high-pressure EH servo valve actuators.

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Heavy Metallurgy & Steel Production

Complexes such as Hoa Phat Dung Quat and Formosa Ha Tinh require robust servo valves for automatic gauge control (AGC) in continuous casting and hot strip mills.

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Offshore & Process Engineering

Vung Tau's offshore oil platforms and chemical refining complexes rely on corrosion-resistant electro-hydraulic actuators for valve positioning and safety shutoffs.

Technical Integration: Electro Hydraulic Servo Valves & LVDT Feedback

An electro hydraulic servo valve does not operate in isolation; it functions within a closed-loop system where position feedback is critical. Linear Variable Differential Transformers (LVDTs) work side-by-side with servo valves to provide continuous feedback of spool positioning and actuator stroke length.

Working Principle of Differential Transformer Sensors (DET200A Series)

The core technology of the linear variable differential transformer DET200A is based on the precision differential transformer mechanism:

Structural Composition: The sensor consists of a primary coil, two symmetrically distributed secondary coils, and a movable iron core. High-frequency alternating current (usually 1kHz~1.5kHz) is passed into the primary coil to generate an alternating magnetic field.
Displacement Detection: When the iron core moves axially with the object to be measured (such as the piston of the hydraulic actuator), the magnetic flux distribution of the secondary coil changes accordingly, resulting in a difference in the induced electromotive force of the two coils. When the core is close to the secondary coil on one side, the output voltage increases, forming a precise differential voltage.
Signal Output & Closed-Loop Control: The differential voltage is linearly related to the displacement of the core. After being processed by the signal conditioning circuit (filtering and amplification), standard analog signals (4-20mA, 0-10V) or digital signals (RS485) are output directly to the plant's DCS/PLC control systems.

Technical Parameters & Performance Indicators

Parameter	Technical Indicator Specification	Industrial Application Relevance
Measurement Range	0 ~ 200mm (Customizable stroke lengths)	Covers full actuator stroke for steam turbine control valves.
Linearity Accuracy	±0.05% ~ ±0.5% (Full Range)	Ensures ultra-precise hydraulic fluid control via servo valves.
Sensitivity Range	2.8 ~ 230 mV/V/mm	Optimized signal resolution under high dynamic frequencies.
Operating Temperature	-55℃ to +180℃	Resists severe ambient conditions in tropical thermal power units.
Excitation Frequency	400Hz ~ 10kHz (Typical 1kHz / 1.5kHz)	Compatible with industrial turbine excitation cards and controllers.

Key Features & Industrial Applications in Vietnam

High Precision & Reliability

Utilizing specialized metal film materials and anti-interference geometry, equipment repeatability reaches 0.1%. No drift during continuous operation ensures zero unplanned downtime in thermal power generation.

Wide Dynamic Response

Minimal time constants allow dynamic response frequencies up to 200Hz, making it optimal for rapid load rejection emergency response in power grids across Vietnam.

Environmental Adaptability

Fully sealed IP67/IP68 structures protect internal windings against Vietnam's coastal high humidity, salt spray, and extreme operational heat environments.

Core Application Scenarios in Local Facilities

Linear variable differential transformer DET200A units and electro-hydraulic servo valves are broadly applied across critical industrial infrastructure in Vietnam:

Steam Turbine Control Systems: Monitoring critical parameters such as actuator stroke, main steam valve opening, and cylinder thermal expansion in thermal plants like Pha Lai, Uong Bi, and Duyen Hai.
Industrial Automation & Robotics: Closed-loop position feedback for hydraulic cylinder positioning, rubber vulcanization presses, and heavy plastic extrusion lines in Dong Nai and Binh Duong.
Energy & Heavy Metallurgy: Monitoring hydraulic roll gaps in steel mills and hydro turbine guide vane position controls in Son La, Hoa Binh, and Lai Chau hydropower plants.

EH System Cleanliness & Maintenance Best Practices in Vietnam

Electro-hydraulic servo valves are engineered with extremely tight mechanical tolerances—often with spool clearances under 3 to 5 microns. In tropical environments like Vietnam, oil contamination and high humidity are the primary causes of valve sticking, signal drift, and premature failure.

Why EH System Cleanliness Decides Servo Valve Lifespan

As highlighted in technical field analysis regarding the 760N1194B Servo Valve EH System Flushing Guide, fluid cleanliness according to NAS 1638 Class 5 (or ISO 4406 15/12/9) is mandatory prior to commissioning. Hydraulic fluid degradation produces varnish and acid byproducts, which deposit on nozzle-flapper assemblies.

Essential Maintenance Steps for Local Engineers:

Pre-Commissioning Flushing: Always install flushing plates (bypassing the delicate servo valves) during initial pipe cleaning or oil changes.
Moisture Control: Use high-efficiency air breather filters like the QUQ2-20x1 Hydraulic Air Filter to prevent atmospheric humidity from entering reservoir tanks.
Cartridge Valve Installation: When replacing directional solenoids such as the J-110V-DN6-D/20B/2A Directional Solenoid Valve, ensure precise torque specifications to avoid housing deformation.

Dongfang Yoyik (Deyang) Engineering Co., Ltd. – Serving Vietnam's Industrial Sector

Founded in 2004 and located in Deyang, Sichuan—the premier heavy manufacturing base of China—Dongfang Yoyik (Deyang) Engineering Co., Ltd. is a leading manufacturer and specialized supplier of power plant components, hydraulic valves, and sensors. Integrating design, R&D, manufacturing, and global sales, Yoyik maintains a technical team of experienced engineers dedicated to supporting overseas projects across Vietnam and Southeast Asia.

Why Leading Enterprises Partner with Yoyik

Rich Industry Experience

Dedicated spare parts expert serving thermal, hydro, and industrial power plants since 2004.

Comprehensive Catalog

Over 3,000 active SKU types covering servo valves, LVDTs, speed sensors, and specialized sealants.

Intellectual Property & QA

Advanced testing rigs, high-precision machining, and multiple patents guaranteeing strict quality control.

Integrated Supply Chain Capabilities for Vietnamese Buyers

Precise Supply

Leveraging nearly two decades of industry resource management to source hard-to-find components at optimal cost.

Factory Inspection

Offering fair, transparent audit and third-party factory inspection reports to eliminate purchasing uncertainty.

Product Quality Control

Controlling end-to-end manufacturing workflows so products comply with international ISO standards.

Logistics Integration

Seamless express shipping via DHL, FedEx, TNT, air freight, and direct sea transport straight to Vietnamese ports.

Frequently Asked Questions (FAQ)

Q1: How do I select the right Electro Hydraulic Servo Valve replacement in Vietnam?

When sourcing replacements for plants in Vietnam, verify rated flow (L/min at 70 bar drop), operating pressure (up to 210/315 bar), coil resistance, feedback mechanism (mechanical vs. electrical LVDT), and mounting pattern (ISO 4401 / CETOP standards).

Q2: What is the function of the WZPM2-001 Thermal Resistance Sheath in power applications?

The sheath of thermal resistance WZPM2-001 fills deep mounting holes during sensor installation. The customized sheath length accommodates varying hole depths while saving replacement costs compared to changing full thermal resistance probes.

Q3: Why are displacement transducers like TD series essential for turbine protection?

Yoyik TD series displacement sensors convert mechanical linear motion into precise electrical signals. This continuous tracking detects rotor thermal expansion and valve position deviations before they trigger dangerous vibration alarms.

Complete Industrial Spare Parts Catalog

Explore our certified inventory of turbine sealants, float valves, displacement sensors, and specialized power plant accessories available for export to Vietnam.

Generator room temperature curing adhesive HDJ-16