EFYG-DA/DCB-NXQ Series Linear Electro-hydraulic Actuator

I.Overview

1. As the actuator of the valve control system, the reliability and controllability of the actuator are directly related to the safety of the equipment.   The quality of its function will directly affect the overall level of automation.

2.Flowtell series electro-hydraulic actuator is an intelligent actuator which integrates hydraulic, electronic and mechanical technology. It not only has the characteristics of intelligent electric actuator and simple operation, but also has the advantages of high precision, high reliability, high life and large load capacity of hydraulic actuator. Modular design, small volume, simple structure, easy installation, debugging, maintenance, do not need a huge independent external oil supply source, simplified the system structur.

3.This series of products can be selected in three forms according to the different site conditions and installation positions:

1）Electro-hydraulic integrated, that is, the electronic control component is integrated on the actuator;

2）Electronic control split type, that is, the electronic control part is independent of the actuator, which is used for the actuator installation position is not easy to operate the occasion;

3）Power split, that is, the power module integrated electronic control unit is independent of the actuator, which is used in the pipeline vibration, high temperature occasions.

II. LPU Technical Parameter

III. Product characteristics

1. Electro hydraulic integration, modular design

2. No need for external oil source, adopts oil circuit block design, as a closed system, no oil leakage risk, high reliability, long service life

3. Requires minimal routine maintenance and is highly adaptable to the operating environment

4. Input and output 4-20mA analog signal or switching signal

5. The travel speed is fast and the required travel speed is determined by the specification and quantity of the power module

6. Two kinds of single acting and double acting cylinders, which can realize large thrust output

7. Speed, dead zone and other parameters can be set

8. With autonomous monitoring and diagnosis function, overload protection and running state alarm can be realized

9. Explosion-proof rating：Exd IIB T4   Protection class:IP66-IP68

10. ESD emergency switch function (optional)

11. Support Ethernet protocol, HART protocol and Modbus protocol (optional)

12. 100% continuous adjustment control or on and off two position control mode.

13.Emergency joint can be connected to emergency hand pump, emergency operation of the system. Pressure gauge can be installed to monitor system pressure during equipment debugging and maintenance, to help operators analyze and determine the cause of failure.

Ⅳ.Product structure composition

1. It is composed of motor, hydraulic pump, hydraulic valve group, oil tank, etc. The motor controls the operation of the gear pump. Once the system reaches the predetermined oil pressure, the motor stops working and the hydraulic valve group ensures that the actuator is locked in situ. The size of the pressure in the loop depends on the size of the load, so there is no excess pressure and excess flow, high efficiency. Because it depends on the gear pump or solenoid valve to change the flow direction of the working medium, so the reversing impact is small, can be used for precise regulation, not restricted by start stop or reversal.

2. Control module:Equipped with the integrated circuit board independently developed by the company, it can realize various logic intelligent control, with local control cabinet button control, emergency hand pump operation and remote automatic DCS control (can support remote control and visual LED screen) and other functions, and can be switched at any time. The control module can be integrated in the circuit control cabinet, or can cooperate with the electric control cabinet for high precision control, the control accuracy can be more than 2‰.

3. Oil cylinder:Using double acting cylinder energy storage reset, according to the needs of the working condition can choose different failure position: FO/FC/FL.

4. Accumulator:According to the different control requirements, the accumulator can participate in ESD function, PST function, fault open/close valve and other functions.

5. Emergency prot:   Actuator standard with hand pump emergency interface. Optional local hand pump.

6. Installation bracket and accessories: Suitable installation bracket can be provided according to different brands of valves. The bracket has anti-rotation function and local indicator of travel. The mechanical limit switch or displacement sensor can be configured according to the demand.

V .Demonstration of the type

1. Composition of the oil cylinder

1) The executive cylinder of this series of products adopts the form of double acting cylinder, and the solenoid valve of different functions can be selected according to the control requirements.

2) Double acting cylinders are used where f.L. is required, and the accumulator can also be used to achieve FO or FC

3) The regulator cylinder is equipped with a direct stroke displacement sensor, the non-contact design can improve the service life of the sensor, the repeated positioning accuracy can reach ±10um. The sensor can set the starting point and the end point of the measurement arbitrarily within the range. The servo control system integrates the function of setting the sensor position, and can realize the automatic or manual check of the actuator stroke through the local operation button.

2. Technical characteristics of the oil cylinder

1)Linear oil cylinder adopts the structure design of high-strength cold-drawn seamless steel pipe and piston after derivative grinding, small size, strong and durable, high output efficiency, wide output force range;

2) The high pressure power of the hydraulic system makes the hydraulic actuator have smaller weight than the pneumatic, electric and other actuator;

3) The hydraulic medium is incompressible and the system has zero leakage and high pressure preservation, so that the electro-hydraulic linkage actuator has very high positioning characteristics.

4) Inflammable hydraulic liquid can be used as medium (such as phosphate ester EH oil, etc.) in high temperature and flammable occasions.

5)High precision position control and speed control can be realized through the proportion and servo valve, so as to realize the adjustment characteristics of the valve.

Ⅵ. Hydraulic operating principle

1. Normal ON/OFF Valve:

1）Open the valve: when the valve opening signal is received, the solenoid valve opening end is energized into the oil circuit, the high pressure hydraulic oil in the accumulator enters the actuator cylinder B chamber, the valve is opened, and the valve is fully opened in place.

2）Close the valve: after receiving the valve closing signal, the solenoid valve closing end is energized into the oil circuit, the high pressure hydraulic oil in the accumulator enters the actuator cylinder A chamber, the valve is closed, and the valve is fully closed in place.

3）At this time, the ESD valve is closed by the bypass oil circuit.

2. Automatic voltage refill function: When the accumulator pressure is lower than the minimum set pressure, the system starts the motor to recharge the accumulator. When the system pressure reaches the maximum set pressure, the system refill is completed and the motor stops.

3. ESD function: The blocking valve to get ESD signal or system power off, the valve quickly closed.

4. PST function: The actuator is equipped with PST function. After receiving PST signal, the valve can be closed to 85% and then opened to fully open (without affecting the pipeline function).

Ⅶ. Output thrust/tension meter

Ⅷ. Outline dimensional drawing

Ⅸ. Electrical wiring diagram

Ⅹ. Remarks:

1. Before installation, ensure that the cylinder, tubing, joints and other hydraulic components clean without any impurities adhesion.

2. The viscosity of hydraulic oil should be 15~68CST, and it should be clean and free of impurities. It is recommended to use 32# hydraulic oil.

3. This hydraulic power unit is suitable for horizontal or vertical installation.

4. After starting the operating system for the first time, check whether the amount of oil in the tank is sufficient.

5. The hydraulic fluid should be replaced after the first 100 hours of system use and every 3000 hours thereafter.

‍EFYG-DA/DCB-NXQ Type Linear Electro-hydraulic Actuators（Download）‍