Hydraulic Actuator
High-force hydraulic actuator for large valves and emergency shutdown systems.
Technical Specifications
| Type | Scotch Yoke / Linear |
| Thrust Range | Up to 500 kN |
| Body Materials | Carbon Steel, Stainless Steel |
| Hydraulic Supply | Up to 350 bar |
| Action | Double Acting / Spring Return |
| Mounting Standard | API 6A, Custom |
| Accessories | HPU, accumulators, control systems |
| Standards | API 6A, API 6D |
Applications
Large gate valves, ESD valves, subsea, offshore
About the Hydraulic Actuator
The hydraulic actuator uses high-pressure hydraulic fluid (typically 200–350 bar) acting on a piston or cylinder to generate the very high forces or torques required to operate large-bore or high-differential-pressure valves that exceed the capability of pneumatic actuators. Two output configurations are used: scotch-yoke type, which converts linear piston motion to quarter-turn (90°) output rotation for ball valves, butterfly valves, and plug valves; and linear (linear ram) type, which drives the stem directly up and down for gate and globe valves. The high operating pressure of hydraulic systems (200–350 bar versus 4–8 bar for pneumatic) enables extremely high force output from a relatively compact cylinder, making hydraulic actuators the only viable choice for large-bore (above 18") pipeline valves and high-pressure (Class 900 and above) process valves.
For emergency shutdown (ESD) and safety-critical applications, hydraulic spring-return actuators store energy in a large compression spring that provides the fail-safe closing (or opening) force. A hydraulic accumulator holds pressurised fluid to provide several rapid close operations even after the hydraulic power unit (HPU) loses supply pressure. This accumulated energy reserve is essential for subsea and remote pipeline ESD applications where the HPU may be located far from the valve or where loss of hydraulic supply is the triggering event for the ESD action. Vajra Industrial Solutions supplies hydraulic actuators in scotch-yoke and linear configurations with matched hydraulic power units, accumulators, and solenoid-operated hydraulic control valves.
Where It's Used
Key industries and applications for the Hydraulic Actuator
Large pipeline ESD and block valves
hydraulic scotch-yoke actuators (spring-return, fail-close) on 16"–48" Class 600–1500 trunnion ball valves and slab gate valves for pipeline emergency shutdown; accumulators provide 3–5 emergency close operations on HPU loss
Offshore wellhead and riser ESD
hydraulic linear and scotch-yoke actuators on API 6A wellhead gate valves, downhole safety valves (DHSVs), and riser isolation valves on FPSO and fixed platforms; rated to API 6A ANSI 2000–20,000 WP
Large-diameter power plant valves
hydraulic linear actuators on Class 600–900 gate valves (12"–36") for main steam isolation, turbine bypass, and feed water isolation in power stations; high thrust overcomes high differential pressure during start-up
Gas compression station block valves
hydraulic scotch-yoke actuators on 12"–24" Class 600 ball and slab gate valves at gas compressor station inlet and outlet isolation; HPU with accumulator provides fail-safe closure on loss of station power
Subsea control systems
compact high-pressure hydraulic actuators integrated into subsea tree and manifold gate valves on deepwater oil and gas production systems; control signal from surface via umbilical; rated for 3,000 m water depth
How to Choose the Right Hydraulic Actuator
Specify hydraulic actuators when the required actuator torque or thrust exceeds the practical limit of pneumatic designs (typically above 10,000 Nm for scotch-yoke or 50 kN for linear thrust), when the valve requires fast ESD closure with accumulator-backed energy storage, or for subsea and offshore applications requiring compact size at very high force output. The hydraulic system design must include: HPU sized for required cycle rate, accumulator sized for fail-safe closure energy without HPU supply, and a control valve package (solenoid valves, manual override, pressure gauges). Specify ATEX/Ex-rated HPU for onshore or offshore hazardous area installation.
Popular Configurations
Most commonly ordered specifications for the Hydraulic Actuator
Frequently Asked Questions
About Hydraulic Actuator - ordering, specs, delivery & compliance
What standards does the Hydraulic Actuator comply with?+
Our Hydraulic Actuator complies with API 6A, API 6D. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Hydraulic Actuator?+
The Hydraulic Actuator is available in Carbon Steel, Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Hydraulic Actuator?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Hydraulic Actuator for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered actuators for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Hydraulic Actuator?+
The Hydraulic Actuator is available in pressure ratings of PN10 to PN400 (ANSI Class 150 to Class 2500). Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Hydraulic Actuator?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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