It is a self‑powered actuator that uses the pressure of the medium within the pipeline itself to drive valve operation, thereby opening or closing the valve. The pneumatic–hydraulic actuator boasts a simple operating principle, safe and reliable control, and strong environmental adaptability, making it capable of withstanding harsh, all‑weather outdoor conditions.

This product directly utilizes pipeline natural gas as its power source. The pneumatic–hydraulic system is designed for high pressure; after the gas source is filtered and treated, it requires no pressure reduction and can be fed directly into the gas storage tank and the high‑pressure pneumatic control valve manifold. Under the action of control signals, the high‑pressure, controlled gas enters the corresponding gas–liquid circuit, where the liquid medium leverages the principle of isobaric transmission to achieve synchronous gas–liquid actuation, applying hydraulic oil to the valve actuator’s cylinder and thereby controlling the valve.

This product directly utilizes pipeline natural gas as its power source. The pneumatic–hydraulic system is designed for high pressure; after filtering and treating the gas source, no pressure reduction is required—instead, the gas flows directly into the gas storage tank and the high‑pressure pneumatic control valve assembly. Under the action of control signals, the high‑pressure, controlled gas enters the corresponding gas–liquid circuit, where the liquid medium leverages the principle of isobaric transmission to achieve synchronous gas–liquid actuation, applying hydraulic force to the valve actuator’s hydraulic cylinder and thereby controlling the valve.

“Pressure is power” is the concise and most perfect explanation of the operating principle of a pneumatic‑hydraulic actuator. The natural gas pressure in the pipeline serves as the driving force that enables the pneumatic‑hydraulic actuator to perform control operations and achieve on‑off functions.

Multiple control methods are available upon request.

◆ Local Control and Remote Operation

◆ Local and remote control, emergency shutdown

◆ Local and remote control, as well as power-on (and power-off) accident safety

◆ Local control options include pneumatic control operation, hydraulic manual pump operation, and remote inhibit/local hold operation.

◆ Perform automatic partial-travel switch testing via local control or remote control.

◆ Powered by lithium battery (optional external power supply and solar power options)

General Applications:

Multiple control methods can be provided according to user requirements, suitable for on/off and angle‑travel ball valves, butterfly valves, plug valves, or damper blades.

Ambient temperature:

Standard range: -30 to 100°C (-20 to 210°F)

Optional range: -55 to 150°C (-65 to 300°F)

Technical Data

Working pressure: 0.4 MPa – 16 MPa

Working medium: compressed air, purified natural gas, high‑pressure nitrogen, etc.

Torque range: 600,000 Nm

Innovatively designed, dedicated, integrated, functional, and plug‑in hydraulic manual pumpA multi‑functional, hydraulically operated manual pump featuring omnidirectional operation and synchronous self‑locking is a patented product invented by our company (Patent Name: An Omnidirectional, Self‑Locking Manual Pump; Patent Type: Invention Patent; Patent Number: ZL 201210115198.9), and it boasts multiple independent intellectual property rights.

When designing hand pumps, Meikeson’s R&D team places people at the center of their work. All the innovations incorporated into the actuator’s control module are driven by the goal of enhancing ease of operation and ensuring safety.

Main advantages:

■ The operating handle can rotate 360° in the horizontal plane, offering strong controllability.

■ The hand pump stand supports inserting the handle from three different positions, offering a more user‑friendly experience in terms of operating position and force application.

■ The pump body piston can simultaneously engage a self‑locking mechanism for the hand pump, effectively protecting the plunger and enhancing safety.

■ The operational space is significantly reduced, and the handle can be detached, resulting in a smaller footprint for installation and more compact packaging dimensions—making it particularly advantageous for process piping layouts with dense equipment installations.

Typical applications:

◆ Local and Remote Control, Emergency Shut-Down Actuators for Pipe Rupture

It is used in conjunction with electronic pipe rupture detection systems. This system is designed for long-distance oil and gas pipelines in scenarios where power is available but unreliable. When the hydraulic control system is integrated with the pipeline rupture detection system, the rupture detection system sends a signal to the actuator to close the valve once the pressure drop rate reaches the preset value. The combination of an electric hydraulic pump and an accumulator helps reduce the power requirements of the hydraulic actuator.

◆ Local and Remote Control, Electrical Accident Safety

When operating normally, the actuator receives normal power; when the system loses power, the valve is closed or opened according to process requirements.

◆ Local and remote control, proportional regulation

For applications that require high precision in flow regulation, select a hydraulic proportional system to control the valve.

◆ Local and remote control, servo adjustment

For applications where process requirements demand linear flow control accuracy and strict valve opening control, a hydraulic servo system should be selected to regulate the valve.

◆ Solar-Powered Hydraulic System

Particularly suitable for applications where there is no power or gas supply, such as long-distance pipelines.

◆ Slow-closing dual-speed control

Parameters

◆ The parallel, dual‑guide fork transmission housing featuring a patented design (Patent Name: A Fork Transmission Housing with Dual Guiding Shafts; Patent Type: Invention Patent; Patent Number: ZL 201210343414.5) can provide higher opening torque for valves with long strokes.

◆ Output torque up to 400,000 N·m

◆ Hydraulic medium: Hydraulic oil or other non‑flammable hydraulic fluids

◆ Ambient temperature – up to +100°C; special temperatures available upon customer request.

Quick on/off control

◆ For different types of valves, rapid closing and opening operations can be performed within 0.5 seconds.

◆ The actuator used to achieve rapid on/off operation can be either single‑acting spring‑loaded or double‑acting.

◆ The control valves feature a high-pressure retention and zero-leakage design.

◆ The solenoid valve is integrated with other hydraulic control components in the oil circuit block, which helps prevent external leakage.

◆ Hydraulic hoses are generally made of stainless steel.

◆ The control cabinet can be made of carbon steel or stainless steel.

Quality Assurance

◆ ISO 9001 Quality System Certification: All executing agencies strictly adhere to the ISO 9001 quality system in their production processes.

◆ Each actuator undergoes 100% inspection at the factory, and every electro-hydraulic actuator assembly is accompanied by a test report.

Features:

◆ The maximum external hydraulic source at the customer’s site is 35 MPa. The hydraulic actuator is equipped with a built‑in control panel and associated control accessories.

◆ The series of parallel, dual‑guide fork transmission boxes featuring patented design (Patent Name: A Fork Transmission Box with Dual Guiding Shafts; Patent Type: Invention Patent; Patent Number: ZL 201210343414.5) can provide high opening torque for quarter‑turn valves DG

◆ Combined structure bearings can provide reliable, smooth operation and extend the service life of actuators.

◆ The high-pressure power of hydraulic systems enables hydraulic actuators to have a lower weight compared to other actuators such as pneumatic and electric actuators.

◆ The fuel tank, hydraulic pump, accumulator, and other components are integrally configured according to user requirements to form a stable and reliable hydraulic power source that can meet both standard needs and the demands of locations with lower power supply reliability.

◆ The combination of pressure, flow, and directional control valves, along with a wide range of electrical control components, forms various hydraulic control systems capable of meeting users’ diverse functional requirements as well as their needs for protection and explosion prevention.  The incompressibility of hydraulic fluid, coupled with zero leakage in the system and the ability to maintain high pressure, gives hydraulic actuators exceptionally precise positioning characteristics.

◆ Can implement emergency self‑protection functions such as valve opening and closing in the event of power failure.

◆ Enables rapid valve closure and rapid valve opening.

◆ In high‑temperature, flammable environments, flame‑retardant hydraulic fluids can be used as the working medium (such as water‑ethylene glycol emulsions, etc.).

◆ Offers both asymmetric and symmetric fork designs to suit valves with different characteristics.

◆ The external travel limit bolts are precisely adjustable within a full range of 90° ± 5°.

Features:

1. The hydraulic source pressure can reach 35 MPa, and the actuator comes equipped with its own control panel. 2. The hydraulic actuator is supplied with a built‑in control panel and associated control accessories.

3. Output Torque: Single-acting 1000–250,000 Nm, Double-acting 100–550,000 Nm

4. Operating Mode: Single-Acting, Double-Acting

5. Manual – Hydraulic manual pump; a hydraulic manual device that can provide independent testing functionality.

6. Operating Environment: Standard Range: -30 to 100°C (-20 to 210°F); Optional Range: -55 to 150°C (-65 to 300°F)

7. The actuator boasts an IP68 protection rating for all‑weather outdoor operation.

8. Explosion-proof rating of the electrical components: Exd IIC T4/T6

9. Stainless Steel Pneumatic Control Box: Protection Rating IP65

10. Electrical Accessories: Solenoid Valves, Limit Switch Boxes, Position Transmitters, Junction Boxes

11. Applications: Switching, Regulation, ESD, Fast Shutdown, Position Holding Control

12. Applicable Valve Types: 90° Angular Stroke, Ball Valves, Butterfly Valves, Plug Valves, or Damper Blades