Bernard angle stroke electric actuator is a commonly used driving device in the field of industrial valve control, and its installation quality directly affects the valve adjustment accuracy, equipment operation stability, and service life. Based on the structural characteristics of the equipment and industrial field application standards, the following installation precautions should be followed:

1、 Preparation before installation

Equipment inspection

Check the actuator model, specifications, torque, and stroke parameters to ensure that they match the parameters of the controlled valves (such as gate valves, globe valves, and regulating valves) and avoid equipment damage caused by insufficient torque or long stroke.

Check the appearance of the actuator to confirm that there are no defects such as transportation bumps, shell cracks, or deformation of connecting parts; Check whether the internal wiring terminals, gearbox, motor and other components are intact, and whether the fasteners are loose.

Confirm the protection level of the actuator (such as IP65/IP67) meets the on-site environmental requirements. Explosion proof actuators should be selected for flammable and explosive places, and the explosion-proof certification qualifications should be verified.

Confirmation of on-site conditions

The installation foundation should be flat, firm, and have sufficient load-bearing capacity to avoid vibration during operation; The installation location should reserve space for operation and maintenance (it is recommended to reserve at least space around the actuator) 300mm maintenance space).

Confirm that the on-site power supply voltage, frequency, and actuator nameplate parameters are consistent to avoid voltage fluctuations or phase errors that may damage the motor; For actuators with control modules, it is necessary to plan the control signal circuit in advance (such as 4-20mA、 The wiring path of the switch signal.

Protective measures should be taken in advance for harsh environments (high temperature, high humidity, corrosive media), such as installing insulation covers, anti-corrosion coatings, and-Water junction box, etc.

2、 Key points of mechanical installation

Connection coaxiality calibration

The coaxiality deviation between the actuator output shaft and the valve stem should be controlled within Within 0.1mm, insufficient coaxiality can cause jamming, increased wear, and even breakage during operation. During installation, a dial gauge can be used to detect coaxiality, which can be calibrated by adjusting the position of the actuator mounting bracket.

Prioritize the use of flexible couplings to reduce vibration transmission caused by rigid connections; The coupling bolts should be evenly tightened to avoid eccentric stress.

Matching installation of valves and actuators

Before installation, the valve needs to be manually operated to confirm that it opens and closes flexibly without any blockage; Place the valve in the middle position or fully closed position (according to the actuator debugging requirements), and then connect it to the actuator for subsequent stroke calibration.

The rotation direction of the angular actuator should be consistent with the valve opening and closing direction, usually clockwise for closing and counterclockwise for opening (can be adjusted according to on-site requirements), to avoid damaging the valve stem by reverse operation.

The installation bracket should use original accessories that match the actuator or customized brackets that meet the strength standards. Welding or bolt fixing should be firm to prevent detachment during operation.

Pre check of travel limit

After installation, manually rotate the actuator output shaft to check if the valve opening and closing stroke is within the rated stroke range of the actuator, in order to avoid damage to the internal limit switch caused by overtravel operation.

3、 Electrical Installation Specification

Wiring operation

Connect the power supply, control signal, and feedback signal lines strictly according to the actuator wiring diagram when the power is cut off. Distinguish between power lines (strong current) and signal lines (weak current) to avoid mixing and causing the control module to burn out.

It is recommended to use shielded cables for signal lines, with the shielding layer grounded at one end to reduce electromagnetic interference; The cable inlet needs to use a sealed joint and tighten the compression nut to prevent water vapor and dust from entering the interior of the casing.

The grounding wire should be reliably connected, and the grounding resistance should meet the specifications (generally not greater than) 4 Ω) to prevent electric leakage accidents.

Control module settings

For intelligent actuators, the control mode (such as regulating type, switch type), stroke range, torque protection value and other parameters need to be set through the local operation panel or upper computer according to the valve type and control requirements.

Confirm feedback signals (such as 4-20mA position feedback) is matched with the range of the control system to avoid signal distortion affecting valve adjustment accuracy.

4、 Commissioning and acceptance after installation

No load debugging

Disconnect the actuator from the valve and conduct a no-load operation test to check if the motor rotation and start stop actions are normal, if the limit switch is accurately triggered, and if there are no abnormal noises or overheating phenomena.

Load debugging

After connecting the valve, perform a full stroke opening and closing test, record the valve opening and closing time, limit position, adjust the actuator stroke limit, and ensure that the valve is complete-Fully open and close without exceeding the travel limit; Test the torque protection function. When the valve is stuck, the actuator should automatically shut down and sound an alarm.

Simulate the control signals emitted by the control system, check whether the actuator response speed and adjustment accuracy meet the requirements, and whether the feedback signals are accurately transmitted to the upper computer.

Acceptance Criteria

The actuator runs smoothly without any jamming or abnormal noise; Valve opening and closing in place, travel deviation≤±1%； The control signal is synchronized with the feedback signal without delay or distortion; The protective seal is good and there is no leakage.

5、 Precautions for operation and maintenance

After installation, the site needs to be cleaned to prevent debris from entering the interior of the actuator or valve.

Regularly check the fastening status of fasteners and wiring terminals to prevent loosening; Regularly replace the gearbox lubricating oil and clean the dust on the surface of the housing according to the usage environment.

It is strictly prohibited to perform mechanical adjustments or wiring operations during the operation of the actuator, and the power supply must be cut off before maintenance.