Precautions for manual valve modification: specialized actuators for automated valves

1、 Valve Applicability Assessment

Valve type and structureNot all manual valves are suitable for conversion to electric valves. Generally speaking, common valve types such as gate valves, ball valves, butterfly valves, etc. are relatively easy to modify structurally. However, some manual valves with special structures or complex working conditions may be difficult to modify, or even impossible to modify. It is necessary to evaluate whether the valve stem strength, thread specifications, connection methods, etc. meet the installation and operation requirements of electric actuators.

Valve working environmentConsider the working environment of the valve, such as temperature, humidity, corrosive media, etc. If the working environment is harsh, such as high temperature, high humidity, or the presence of highly corrosive media, it is necessary to choose electric actuators and accessories with corresponding protection levels and corrosion resistance to ensure that the modified electric valve can operate stably for a long time.

2、 Selection of electric actuators

Torque matchingBased on factors such as the specifications, working pressure, and medium characteristics of manual valves, accurately calculate the torque required for valve opening and closing, and then select an electric actuator with appropriate torque. Insufficient torque may cause the valve to fail to open or close properly, while excessive torque may damage the transmission components of the valve or electric actuator.

Travel itinerary matchingManual valves of different types and specifications have different strokes, and it is necessary to ensure that the stroke of the selected electric actuator matches the actual stroke of the manual valve. If the travel does not match, it may cause the valve to fail to open or close, affecting the normal use of the valve.

Control mode and functional requirementsClearly define the control requirements for electric valves, such as remote control, local control, automatic control, etc., and select electric actuators with corresponding control methods and functions. At the same time, it is also necessary to consider whether special functions such as opening indication, fault alarm, position feedback, etc. are required to be compatible with existing control systems.

3、 Installation and Connection

Installation space and locationBefore installing the electric actuator, ensure that there is sufficient installation space on site for the installation, commissioning, and maintenance of the electric actuator. At the same time, it should be noted that the installation position of the electric actuator should be easy to operate and maintain, and not affected by surrounding equipment or environment.

Connection reliabilityThe connection method between electric actuators and manual valves usually includes flange connection, bracket connection, etc. It is necessary to ensure that the connection is firm and reliable, and avoid loosening or displacement during operation. During the connection process, it is necessary to strictly follow the installation instructions to ensure installation accuracy. For example, the tightening torque of bolts during flange connection should meet the requirements.

4、 Electrical system configuration

power supplyDetermine the power requirements of the electric actuator, such as voltage, frequency, etc., and ensure that the on-site power supply can meet their needs. At the same time, it is necessary to plan the laying of power lines reasonably to avoid interference with the power or signal lines of other devices.

Wiring and GroundingElectrical wiring should use suitable cables and be laid according to relevant standards to ensure good insulation performance of the cables and avoid leakage or short circuits. At the same time, grounding protection should be implemented to ensure the safe operation of electric valves and related equipment.

5、 Debugging and Testing

No load debuggingAfter installation, the first step is to perform no-load debugging, that is, to conduct a separate power test on the electric actuator without connecting the valve, to check whether its motor operation, transmission component action, etc. are normal, and to verify whether the reception and processing of control signals are accurate and correct.

Load debuggingAfter the no-load debugging is normal, connect the electric actuator to the valve for load debugging. During the debugging process, it is necessary to gradually check whether the valve's opening and closing actions, stroke control, torque protection, and other functions are normal. At the same time, observe whether there are any abnormal vibrations, noises, or heating phenomena in the electric actuator and valve during operation.

Joint debugging with control systemIf the electric valve needs to be connected to the existing control system, it is necessary to conduct joint debugging and testing to ensure that the signal transmission, control logic, etc. between the electric valve and the control system match each other, and achieve remote control, automatic control, and other functions.

6、 Safety and Maintenance

Safety protection measuresThe renovated electric valve should have * safety protection measures, such as setting valve position limit switches, over torque protection devices, etc., to prevent the valve from being damaged due to overtravel or over torque, and to avoid safety hazards to personnel and equipment.

Maintenance and CareDevelop a reasonable maintenance plan and regularly inspect, clean, lubricate, and debug electric valves for maintenance work. At the same time, it is necessary to reserve a certain amount of vulnerable parts, such as seals, bearings, gears, etc., so that they can be replaced in a timely manner in case of failure to ensure the normal operation of the electric valve.