Instrumentation: [Question of the Week] Week 34, 2011: Installation requirements for electric actuators

This post was last edited by denghl on 2012-12-21 at 21:49. ① The mechanical parts of the actuator should operate smoothly, with no looseness or jamming. ②The electrical insulation of the actuator must be satisfactory; it should operate smoothly during power-on testing, and there should be no fluctuations in the opening indication. ③The actuator should have clear on/off direction indicators ； The rotation direction of their handwheels should be consistent; generally, clockwise is designated as “off” and counterclockwise as “on”.

This post was last edited by denghl on 2012-12-21 21:51. What are the requirements for installing electric actuators? 1. Take appropriate actions in accordance with the on-site explosion protection requirements and the explosion protection rating of the electric actuator ； 2. Confirmation of installation location. Ample space, with no impact on the operations during the journey and easy to maintain ； No strong electromagnetic interference in the surroundings ； If it is outdoors or there is a lot of dust, take measures to protect against rain and dust ； 3. It is particularly important to ensure that the installation location is free from severe vibrations and high temperatures. 4. Of course, run it after installation is complete, and then make adjustments

This post was last edited by denghl on 2012-12-21 at 21:52. I. Inspection of actuators: 1. Verify that the model and specifications of the actuators meet the design requirements, and that their installation locations are clearly marked. 2. The exterior of the actuator should be intact; its mechanical operations should be smooth, with no looseness or jamming. 3. The insulation resistance value of the electrical components of the actuator should be greater than 0.54 megohms. II. Selection of the position for the actuator: 1. The actuator is generally installed near the control mechanism; it should not impede passage or maintenance work, and it must be easy to operate and maintain. 2. The length of the links in the actuator generally does not exceed. Otherwise, corresponding measures should be taken. 3. The rotating arms of the actuator should move within the same plane. At half opening, both swivel arms should be perpendicular to the link. If the actuator arm does not move in the same plane, a reversing joint should be installed. 4. The actuator should be installed such that turning the operating handwheel clockwise reduces the flow, while turning it counterclockwise increases it; otherwise, the direction in which the handwheel should be turned to operate the switch must be indicated on the actuator. 5. When the damper undergoes thermal displacement along with the main equipment (such as secondary air), the installation of the actuator must ensure that its relative position to the damper remains unchanged; moreover, the effect of conducted heat must also be taken into account. 6. When necessary, coordination with maintenance personnel is required to select an appropriate installation location for the damper. There should be clear and correct indicators on the damper showing the direction of opening and closing. 7. The control cabinet for the separate actuator should be installed as close as possible to the actuator, and the total length of the signal pipelines should not exceed a certain limit. III. Installation of the actuator 1. Embed iron components in the concrete platform according to the installation location of the actuator. The linkage of the actuator that crosses the platform should have holes provided, and a waterproof plate 5 centimeters above the ground level should be placed around those holes. 2. Machine the upper and lower plates of the electric angular travel actuator base according to the model of the actuator. 3. Choose the type of actuator base based on the model of the actuator and its output torque. 4. The welding of the actuator base during assembly shall comply with the welding specifications, and welding deformation shall be minimized. 5. For the base of pneumatic angular stroke actuators, a configuration with two parallel channel steels can be selected. 6. When the actuator base is installed on a concrete structure with embedded iron parts or on a steel structure platform, it can be fixed by welding. 7. When the actuator base is installed on a concrete structure without embedded iron parts, it can be fixed using wall-penetrating bolts. 8. When actuators with low torque are installed on the ground, it is advisable to use steel sections and weld them firmly to the chassis before concrete is poured. Actuators with high torque are installed on reinforced concrete foundations. 9. The fixing bolts for the actuator and base must be complete and secure. 10. For the reduction gearbox of electric actuators, an appropriate lubricant should be selected based on the operating environment. Before filling with oil, check whether the fastening screws of the actuator’s reduction gearbox are loose, and ensure that the amount of oil poured is above the centerline of the oil fill hole. IV. Linkage Configuration and Installation 1. Ball hinges are recommended for linkage assemblies, and the choice should be based on the torque output of the actuator, as well as the diameter and thickness of the arm holes. 2. Calculate the length of the actuator arm based on the opening requirement of the actuator. The linear travel of the actuator arm from fully closed to fully open should be equal to the linear travel when the actuator arm rotates 90 degrees. The length of the actuator’s swing arm can be determined using graphical methods or calculation techniques. 3. The connection points of the actuator’s swing arm should be drilled with pin holes using a drill press at positions determined through calculations. The hole diameter and taper must be compatible with those of the spherical hinge. To facilitate adjustments during installation, it is advisable to drill 1–2 spare holes on each side of the main holes. When fabricating the swing arm of the actuator oneself, its strength should be less than that of the original actuator’s swing arm. 4. The length of the connecting rod tube should provide sufficient adjustment margin, and its ends should be equipped with connection fittings featuring male and female threads respectively, along with locking nuts. 5. After the linkage assembly is installed, it should be checked that there are no loose gaps at any of the connection points, and that all split pins and tightening nuts are present. V. Adjustment of the actuator 1. Set the actuator in manual mode for manual operation; when the arm of the electric actuator rotates 90 degrees or the piston of the pneumatic actuator moves from its lowest to its highest position, adjust the length of the actuator’s arm or linkage so that it achieves full closed or full open positions. Additionally, the angle between the arm and the linkage should be 90 degrees when the actuator is in the intermediate position. 2. After adjusting the linkage of the electric actuator, the two stop blocks on the frame must be tightened in the fully closed and fully open positions of the rotating arm; the opening indication of the pneumatic actuator should match that of the control valve. 3. Before powering on a pneumatic actuator for the first time, it is necessary to loosen the air supply pipeline connections to the actuator and purge the pipelines thoroughly before it can be put into use. 4. When the actuator is powered on, its switch direction must be correct; the operation should be smooth without any abnormal noises, and the opening indication must be accurate with no fluctuations. 5. The pneumatic actuator should also be used to check the tightness of the system, the operation of the piston, and the servo response time. Technical requirements such as triple-break protection must comply with the regulations.

This post was last edited by denghl on 2012-12-21 at 21:54. The actuator is generally installed near the control mechanism; it should not impede passage or the maintenance of the control mechanism, and it must be easy to operate and maintain； The connecting rod should not be too long; otherwise, the diameter of the connecting pipe must be increased ； The swing arms of the actuator and the regulator should move in the same plane (otherwise, an intermediate device or reversing joint must be installed). Generally, at ½ opening, the rotating arm should be approximately perpendicular to the linkage ； After the actuator and the control mechanism are connected by a linkage, the operation handwheel of the actuator should cause the control mechanism to close when turned clockwise, and to open when turned counterclockwise.

I want to know the answer. I wonder how well the guys answered?

I really just want to learn*learn*

It should be installed vertically, as it is relatively heavy, to prevent the valve stem from bending

I just want to know the answer...

This post was last edited by denghl on 2012-12-21 21:55. Reply to 1# Baghdad: The actuator is generally installed near the regulating mechanism. The 2-link rod should not be too long. 3 The swing arms of the actuator and the regulator are mounted in the same plane. 4 When the operator of the actuator rotates clockwise, the adjustment mechanism closes. 5 When the regulating mechanism undergoes thermal displacement along with the main equipment, the installation of the actuator must ensure that its relative position to the regulating mechanism remains unchanged.

This post was last edited by denghl on 2012-12-21 at 21:56. 5.1 Workflow diagram for tasks: 5.2 Task methods and requirements: Inspection of actuators: .1 Verify that the model and specifications of the actuators meet the design requirements, and indicate their installation locations. .2 The appearance of the actuator should be intact, with smooth mechanical operation and no signs of looseness or sticking. .3 The insulation resistance value of the electrical components of the actuator should be greater than 0.54 megohms. Selection of actuator location: .1 The actuator is generally installed near the control mechanism, without obstructing access or maintenance, and should be easy to operate and service. .2 The linkage length of the actuator generally should not be greater than. Otherwise, corresponding measures should be taken. .3 The rotating arms of the actuator should move within the same plane. At half opening, both swivel arms should be perpendicular to the link. If the actuator arm does not move in the same plane, a reversing joint should be installed. .4 The actuator should be installed such that turning the operating handwheel clockwise reduces the flow, while turning it counterclockwise increases it; otherwise, the direction in which the handwheel should be turned to operate the switch must be indicated on the actuator. .5 When the control valve experiences thermal displacement due to the heat generated by the main equipment (such as secondary air), the installation of the actuator must ensure that its relative position with respect to the control valve remains unchanged, and the effects of conductive heat must also be taken into account. .6 If necessary, coordination with the maintenance team should be sought to select an appropriate installation location for the control valve; the valve shall have clear and correct indicators indicating the direction of operation. .7 The control cabinet for the split-type actuator should be installed as close as possible to the actuator, ensuring that the total length of the signal piping does not exceed. . Actuator installation .1 Embed iron components in the concrete platform according to the installation location of the actuator. The linkage of the actuator that crosses the platform should have holes provided, and a waterproof plate 5 centimeters above the ground level should be placed around those holes. .2 Machine the upper and lower plates of the electric angular travel actuator base according to the model of the actuator. .3 Select the type of actuator base based on the model of the actuator and its output torque. .4 The welding for assembling the actuator base shall comply with welding specifications, and welding deformation shall be minimized. .5 The base of the pneumatic angular travel actuator can be in the form of parallel double-channel steel. .6 When the actuator base is installed on a concrete structure with embedded iron parts or on a steel structural platform, it can be fixed by welding. .7 When installing the actuator base on a concrete structure without embedded iron parts, it can be secured using through-wall bolts. .8 When installing actuators with relatively low torque on the ground, it is advisable to use section steel and weld it firmly to the base plate prior to pouring concrete. Actuators with high torque are installed on reinforced concrete foundations. .9 The fixing bolts between the actuator and the base must be complete and secure. .10 For the reduction gearbox of electric actuators, an appropriate lubricant should be selected based on the operating environment. Before lubrication, check whether the fastening screws of the actuator’s reduction gearbox are loose. The amount of lubricant added should be such that it remains above the centerline of the oil filler hole. Linkage configuration and installation .1 Ball hinges are recommended for linkage assemblies, and their selection should be based on the output torque of the actuator, as well as the diameter and thickness of the arm holes. .2 Calculate the actuator arm length based on the opening requirement of the actuator. The linear travel of the actuator arm from fully closed to fully open should be equal to the linear travel when the actuator arm rotates 90 degrees. The length of the actuator’s swing arm can be determined using graphical methods or calculation techniques. .3 The connection points of the actuator arm should have pin holes drilled at the calculated positions using a drill; the diameter and taper of these holes must match those of the spherical hinge. To facilitate adjustment during installation, it is advisable to drill 1–2 spare holes on each side of the hole. When manufacturing the actuator arm itself, its strength should be lower than that of the actuator’s actual arm. .4 The length of the connecting rod tube should provide sufficient adjustment margin, and its ends should be equipped with connection fittings featuring male and female threads respectively, along with locking nuts. .5 After the linkage assembly is installed, it should be checked that there are no loose gaps at any of the connection points, and that all split pins and tightening nuts are present. Actuator adjustment: 1. Set the actuator to manual mode and perform manual operation. When the rotating arm of an electric actuator rotates 90 degrees, or when the piston of a pneumatic actuator moves from its lowest to highest position, adjust the length of the actuator’s rotating arm or connecting rod so that the valve reaches both fully closed and fully open positions. Additionally, when the valve is in the intermediate position, the angle between the rotating arm and the connecting rod should be 90 degrees. .2 After adjusting the linkage of the electric actuator, the two stop blocks on the frame must be tightened in the fully closed and fully open positions of the rotating arm; the opening indication of the pneumatic actuator should correspond to that of the control valve. .3 Before the first inflation of the pneumatic actuator, the connector of the air supply pipeline connected to the actuator must be loosened; only after purging the pipeline can it be put into service. .4 When powering the actuator, its switch direction must be correct; the operation should be smooth without any abnormal noises, and the opening indication must be accurate with no fluctuations. .5 The pneumatic actuator should also be used to check the system’s airtightness, the piston’s movement, and the servo response time. Technical requirements such as triple-break protection must comply with the regulations. 6 Quality Objectives, Requirements, and Scope of Quality Assessment 6.1 Quality Objectives: Meet standards, achieve provincial excellence, and strive for national excellence ； The actuator is firmly and reliably installed in place ； The actuator should move smoothly, without any looseness or sticking ； The torque switch and transmission mechanism should operate smoothly and reliably ； The insulation resistance should be within acceptable limits, and the rotation when powered on should be smooth ； The reduction gearbox of the electric actuator shall be lubricated in accordance with the manufacturer’s specifications, and there shall be no oil leakage. The device’s label and nameplate terminals must be complete and intact, with correct and clear markings. 6.2 Quality requirements: Process quality assurance measures: .1 Strengthen technical training for construction workers to further improve their capabilities. .2 Conduct a \"safety and technical briefing\" prior to construction. .3 Strengthen on-site construction quality management during construction. Measures to prevent common quality issues or to create high-quality projects: .1 Operate in accordance with a quality certification management system, ensuring that everything is documented and governed by established rules. .2 Strictly comply with the regulations, standards, and management rules issued by ** and the industry. .3 Strictly implement the relevant provisions of the company’s “Interim Standards for the Implementation of High-Quality Projects”. .4 Strictly implement the company’s regulations on “measures to prevent common quality issues” and “eradicating *inherent violations”. .5 Strictly implement the company’s “measures for protecting finished products and preventing secondary pollution”. .6 Vigorously carry out mass-based activities for team building to achieve transparent and inclusive management. .7 Strengthen quota management. Break away from any form of equalitarian or differentiated treatment in distribution, truly ensure that those who work more earn more, and stimulate workers’ enthusiasm for work. 6.3 Scope of quality inspection and evaluation: Construction shall be carried out in accordance with the approved scope of project quality inspection and evaluation. Appendix: Standard table numbers and names of inspection criteria. Installation of thermal electric actuators, Installation of thermal pneumatic actuators, Installation of electric drives for thermal electric valves, Installation of thermal electric tie rods, Installation of thermal solenoid valves, Installation of control systems for thermal pneumatic control valves