I Spring return electro-hydraulic actuator function overview
This electro-hydraulic actuator has three sets of operating functions: Local control cabinet operation,remote control operation and emergency hand pump operation:
1.Remote control：
1）Single action FC(or FO) : open (or close) the valve to the solenoid reversing valve by opening (or closing) the valve signal. When the systemen counters an emergency state such as loss of power and loss of signal, without any instruction, the solenoid valve will cut off and reverse, and the spring in the actuator will quickly return and automatically close (or open) the valve.
2） Intelligent valve regulation and control: in the condition that the valve opening degree and stage speed arerequired to be adjusted, the actuator is equipped with servo proportional valve,displacement sensor and PLC. Under the control signal of 4 ~ 20mA, the actuator's stroke location of 0° ~ 90° can be adjusted.
Note:the electro-hydraulic actuator itself is a closed-loop control system, which can set the following parameters on the actuator body: valve opening/closing speed, working pressure of hydraulic system, delay alarm time of self-protection device,etc.
2.Local control cabinet operation：
The control cabinet panel is equipped with buttons for emergency local operation,indicator light for valve position,alarm light for valve failure and emergency cut-off switch.
The indicator of valve position shows the current state of the valve, and he opening valve light is on, indicating that the valve is in the open state. Similarly, the closing valve light is on, and thevalve is in the closed state.
Valve position fault light: indicating valve stuck or hydraulic system failure, need maintenance.
Emergency cut-off switch: press this switch, the control cabinet will automatically cut off the power supply,making the system stop working instantly. At this point, the actuator is reset under the action of the spring.
Valve closing button: press this switch and the valve will be closed in place.
Local/remote switch handle: switch to local operation file, and the valve can be operated in place;switch to remote file, you can control the valve by remote signal.
Note: PTS of partial stroke test system can be configured according to the operating conditions controlled by the user's valve。
3.Emergency hand pump operation：
This electro-hydraulic actuator is equipped with animported emergency hand pump. Switching to the operation mode of emergency handpump, it can open or close the valve by mechanical means in the case of power loss of the system.
4.Mechanically locked valve
After the valve opening/closing operation is completed, close the locking globe valve at the oil inlet and outlet on both sides of the actuator to mechanically lock the actuator to maintain the current valve state. No matter how the electric control cabinet or the hand pump system on the actuator is operated, the current valve state cannot be changed. This function can prevent the wrong operation on site. If normal operation is to be resumed, open the lock stop valve and the control cabinet and the hand pump system will be restored.
II Structure composition of electro-hydraulic actuator & output torque and external dimension
Ⅲ Working principle of hydraulic control of electro-hydraulic actuator
Ⅳ Electrical control principle of electro-hydraulic actuator mechanism
1. Control box panel diagram
2. Wiring diagram
Note:
1. This electro-hydraulic is S1 working system.
2. Before installation, hydraulic components such as oil cylinder,oil pipe and connector must be clean without any impurities and adhesion.
3.Hydraulic oil viscosity should be 15~68CST, should be clean withou timpurities, N46 hydraulic oil is recommended.
4. This electro-hydraulic is suitable for horizontal installation, and other installation methods need special design.
5. After starting the system for the first time, check whether the amount of oil in the oil tank is sufficient.
6. The hydraulic oil should be replaced after the first 100hours of system use and every 3000 hours there after.
7. This scheme is the basic configuration of this series of products.Our company can customize the configuration according to customers specific requirements and special working conditions, so as to fully meet customers' different needs.
F4-Y-SR/HPU series spring reset electro-hydraulic linkage actuator（Download）
