DHE-EH series intelligent electro-hydraulic actuator
DHE-EH series intelligent electro-hydraulic actuator is a new type of actuator mainly used for valve opening control. It receives analog signals, switching signals, etc., and realizes linear displacement or linear displacement through the servo control system, high-precision displacement sensor and hydraulic actuator. Angular displacement. It has the characteristics of integrated structure, high adjustment accuracy, adjustable segment speed, multiple fault safety, and easy operation.
DHE-EH series electro-hydraulic actuators can be matched with various valves such as butterfly valves, ball valves, plug valves, dampers, gate valves, globe valves, etc., and are suitable for electric power, metallurgy, petrochemicals, pipelines, ships, docks, urban water treatment, industry equipment and many other fields.
Application industry
| Industry category | Main application scenarios |
| Oil depots, tank farms, terminals | Can root emergency shut-off valve, pump station room, loading platform, water and land transfer platform, etc. |
| Petroleum refining | Heating furnace, catalytic and cracking device, PSA hydrogen production device, etc. |
| Oil and gas fields, long-distance pipelines | Oil production wellhead, entry and exit station, intermediate pressure regulating place, oil and gas distribution, etc. |
| Coal chemical industry, coking | Hot blast stove, coke oven quenching water, flue gas baffle, etc. |
| Power plant | Steam turbine, blast furnace blower, induced draft fan, etc. |
Integrated structure: Integrated structure design, with its own power and oil source, built-in oil circuit, and no external oil pipe. Compared with external oil pipes, it greatly reduces the risk of oil leakage and is easy to install.
Servo control system: Based on the working principle of pump control, it uses a servo motor, a two-way gear pump and a high-precision position feedback device to achieve forward and reverse switching of the oil circuit without the need for a control valve. It has a compact structure, fast response speed, high control accuracy, and no noise.
Multiple fault safety: Fire-proof hydraulic quick-response pressure relief valves, normally open solenoid valves (no built-in power supply required), hand-operated mechanisms, inflators, etc. are set up in parallel to cope with multiple fault types {power outage, signal outage, fire, ESD etc.), in an emergency, the valve can be quickly cut off, opened or maintained.
Segmented speed control: Multi-stage speed settings can be achieved, and the operation is stable and efficient. It can reduce the water hammer effect caused by quickly closing the valve and avoid damage to the valve.
Cover-free operation: Parameter setting, equipment debugging, etc. can be completed through magnetic induction or non-invasive infrared induction operation. There is no need to open the electronic control cover, making it easy to use.
Friendly human-machine interface: It adopts high-brightness and low-temperature-resistant OLED display, which can adapt to a variety of environmental climates and can display various information such as opening, pressure, temperature, and fault prompts in real time.
Functional safety: Designed and produced based on IEC 61508 standard, meeting functional safety level SIL3, improving product safety.
Diagnostic protection: It has fault diagnosis protection function, which can realize temperature protection, stall protection, stall protection, pressure protection, over-torque\thrust and limit protection, etc.
(DHE-EHJ quarter-turn electro-hydraulic actuator)
Product advantages
DHE-EHJ
Intelligent quarter-turn actuator
(DHE-EHZ straight stroke electro-hydraulic actuatorr)
Product structure and working principle
Intelligent quarter-turn electro-hydraulic actuator is mainly composed of servo motor, hydraulic power valve group, electronic control unit, quarter-turn emergency valve group, gear-rack actuator, manual operation valve group, power valve group, accumulator, etc. , as shown in the figure below:
When the control system signal (on/off quantity or analog quantity) is input to the electro-hydraulic actuator, the electronic control unit accepts the signal size and controls the servo motor to drive the two-way gear pump to rotate forward or reverse. At this time, the hydraulic oil pressure increases and passes through The integrated power valve group enters one side of the gear-rack actuator cylinder and the cylinder on the other side is unloaded, causing a pressure difference in the cylinders on both sides. At this time, the piston generates thrust under the action of hydraulic oil pressure, and passes through the gear-rack Converted into 0~90 degree angular motion of the actuator.
The actuator is available in two forms
Regulating type, suitable for flow control and valve [ ] adjustment.
Switch type, suitable for use when the valve is fully open or fully closed.
DHE-EHZ
Intelligent linear electro-hydraulic actuator
Product structure and working principle
The intelligent straight-stroke electro-hydraulic actuator is mainly composed of servo motor, hydraulic power valve group, electronic control unit, straight-stroke emergency valve group, cylinder actuator, manual operation valve group, power valve group, accumulator and other parts.
When the control system signal (on/off quantity or analog quantity) is input to the electro-hydraulic actuator, the electronic control unit accepts the signal size and controls the servo motor to drive the two-way gear pump to rotate forward or reverse. At this time, the hydraulic oil pressure increases and passes through The integrated power valve group enters one side of the cylinder actuator, and the cylinder on the other side is unloaded, causing a pressure difference in the cylinders on both sides. At this time, the piston generates thrust under the action of hydraulic oil pressure, which is converted into thrust of the actuator through the cylinder piston. linear motion.
