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Important data required for multi-turn electric actuator sizing
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(Mechanical)
(OP)
2 Jul 14 14:42For sizing a multi-turn electric actuator for a Knife Gate Valve:
1.Should we consider both Torque (Torque required to open & close valve i.e. seat/unseat) and Thrust (Force required to open and close the gate) or anyone of these could be enough?
2.Why do we need to know the valve stem number of Turns?
(Mechanical)
3 Jul 14 11:45You probably only need to specify torque, but knowing both would be good - I have seen some undersized thrust bearings on actuators before.
There are actuators with a limited number of rotations, so knowing how many turns are required can be important.
(Petroleum)
3 Jul 14 11:51I agree with bt - the actuator only really needs to see the torque and let the valve cope with the thrust. You need to know the number of turns to work out the required rotational speed - either the actuator is specified in how long it takes to open / close or it is something the buyer wants to know. One turn to close versus 10 turns to close at the same closure time needs a different speed motor or different gearing.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
(Mechanical)
3 Jul 14 13:01The thrust base plates on multi-turn electric actuators have an upper limit. Where the thrust force is taken is another matter. If there is a thrust plate on the valve that takes that thrust force, your actuator will only see torque. If the actuator drive bushing is taking the thrust, then the thrust of the valve is required to ensure your actuator can handle the force, in which case, you must consider both thrust and torque.
Number of stem turns is typically related to the speed in which you open or close the valve. If you have a 1/4" pitch 1/4" lead valve stem, and you need 12 full stem turns to open the valve, you need 48 revolutions. If your actuator has 96 RPM, you can open the valve in 30 seconds.
(Mechanical)
(OP)
The company is the world’s best multi turn electric actuator factories supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
4 Jul 14 11:16Gentlemen thanks for sharing the knowledge. Actually I am trying to size a multi turn actuator and I do not have these two parameters available with me. I do have thrust value but do not have enough stem data. Could we get a screw made to operate the valve with multi turn actuator? I have experienced in the past that by measuring/counting the number of stem threads wont be that much useful (in case you do not have valve data sheets).
(Mechanical)
7 Jul 14 10:27What is the valve thrust? Do you have any of the valve data? Size, manufacturer, rising stem or non-rising stem, etc.? You really should have stem dimensions to determine the stem factor - this will allow you to more accurately predict the torque required.
(Mechanical)
(OP)
7 Jul 14 13:22Finally ,I got some info. regarding valve. Its 24" FCC. I downloaded the data sheet from internet but it does not shows much of stem data.
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Assured Automation: your source for Manual and Automated Valves & Flow Meters.
This is the wiring instruction video for the Assured Automation S4 Multi-Voltage Reversible Electric Actuator series.
The S4 Series is a 1/4 turn multi-voltage electric valve actuator which incorporates the latest advances in motor and control technology at an economical price.
The S4 multi-voltage reversible electric actuator incorporates automatic voltage sensing and allows for AC or DC supply within each voltage range. The electronic torque limiter protects the actuator and the LED status lights allow for easier field diagnostics. The domed position indicator provides a visual indication of valve position. The DIN wiring connections allow the unit to be field wired without opening the actuator.
Options include a plug-and-play analog to digital positioner and a battery “spring return” feature that allows the actuator to fail closed or fail open in the event of a power failure.
S4 wiring instructions for AC and DC Electric Actuators
The S4 Series is a reversing motor actuator with end of limit travel switches to stop the motor in either direction. A wiring diagram can be found on our website or if needed on the outside cover of the actuator
Safety first, make sure all power is off!
To access the terminal strip remove the screws from the Main Power Connector and the contact switch connector and pull off. To access the wire terminations; use a small screwdriver to separate the connector.
Large Din Connector is for Main Power
Wire as follows for 3-Wire Control: To open unit counterclockwise rotation, Place positive DC power or AC Line on Terminal 3, Negative DC power or AC neutral on Terminal 1
To close unit clockwise rotation, Place positive DC power or AC Line on Terminal 2, Negative DC power or AC neutral on Terminal 1
DC Voltage actuators can also be wired using a 2 wire control
Wire DC units as follows for 2-Wire Control:
Large Din Connector is for Main Power. To open unit counterclockwise rotation, Place positive DC power on Terminal 3, Negative DC power on Terminal 2
To close unit clockwise rotation, Place positive DC power on Terminal 2, Negative DC power on Terminal 3
Small Din Connector is for Isolated Dry Contact Switches
Supply AC or DC power on Terminal 1
Feedback power for Open position will be at terminal 3
Feedback power for Close position will be at terminal 2
These same wiring instructions apply for the battery backup unit
For Modulating actuators with positioner boards wire as follows. This unit will have 3 external connectors
Large Din Connector is for Main Power. Wire as Follows
Positive DC Power or AC line on Terminal 2
Negative DC Power or AC Neutral on Terminal 1
Middle Small Din Connector is for control signal (4-20mA or 0-10VDC) Wire as Follows:
Negative input on terminal 1
Positive input on terminal 2
The right small Din Connector is for dry contact switches. The same wiring instructions shown earlier is this video apply for these dry contact switches.
To use the manual override in the event of power loss, Turn the switch on the actuator to manual and use the handwheel on top to turn the actuator to the desired position.
Make sure to turn the switch back to Auto when you are done with the manual override so the actuator will respond to electronic controls.
Assured Automation: Your Source for Manual & Automated Valves and Flow Meters.
Thank you for viewing.
From your friends at Assured Automation
assuredautomation.com
For any other questions contact us online or call toll free at
1-800-899-0553.
View J+J Electric Actuators Part Number Cross Reference
If you want to learn more, please visit our website linear valve factories.