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Old February 24th, 2018, 08:40 AM   #1
munguni
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Valve position control

i bought this motorized ball valve :'' HSH-Flo 1" DN25 2 Way SS304 Motorized Ball Valve,1 Inch Electrical Ball Valve- from china. its model or wiring is CR5-02 FIVE WIRE. OBTAINABLE FROM THIS LINK.,
https://www.youtube.com/watch?v=7DE9tpWQPrs&t=9s

On the basis of this video obtainable from this link, https://www.youtube.com/watch?v=uhINXt8igHU, i went on to buy the valve assuming that it is a 4-20mA as is seen from the second link.

i powered it from a 9volt dc power supply, it works perfectly, but when you try to power it from a PLC, It will not open. i still need to buy 8 more such valves

Does anyone has an idea as to whether the above valve has a position control as suggested in the two videos, and if so what is the wiring diagram required for this control. please note that the diagrams supplied by the suppliers do not have position control requirements

L Munguni
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Old February 24th, 2018, 10:22 AM   #2
danw
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1. First link comes up as a video, not a wiring diagram.

2. Why do you see a need to power all nine valves from you PLC? Why not use an external DC power supply?
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Old February 24th, 2018, 11:14 AM   #3
damica1
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Use - External Power Supply.
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Please Download from our download section "Monitor and Control" .pdf.
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Old February 24th, 2018, 12:47 PM   #4
bernie_carlton
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Is this the unit?

https://www.amazon.com/HSH-Flo-Motor.../dp/B00VPR4U5S

If so it appears to be full open/closed only. The feedback is from the full open and full closed positions.

It appears that this one

https://www.amazon.com/HSH-Flo-Motor.../dp/B0192REJGW

Can be left in a partly open position. But it is positioned by switches not an analog signal. It has no feedback.

And yes, an external power supply for either one.

(Love Google)
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Old February 25th, 2018, 10:49 AM   #5
boneless
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I would seriously consider my alternatives here, I seriously doubt the quality of this product..
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Old February 25th, 2018, 12:20 PM   #6
Tom Jenkins
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I did a lot of control using valves without position feedback. I would simply compare my process signal, such as flow, to the flow setpoint. If it was low I'd use a short contact closure to "bump" the valve open a little. If flow was high I'd bump it closed. If the open or closed limit switch in the valve was tripped I'd know I had hit the limit of control.

An issue with using this valve to control flow is its 9 seconds from open to closed. That sort travel will make control pretty jumpy.
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Old February 25th, 2018, 08:50 PM   #7
bernie_carlton
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On reading the data for that second valve I posted

https://www.amazon.com/HSH-Flo-Motor.../dp/B0192REJGW

I see that it's not fully adjustable. It has only two intermediate positions between full open and full closed.
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