Solenoid coil drop out speed
Solenoid coil drop out speed
(OP)
I have a 120 volt ac coil on a 2" water valve that I would like to convert to slow operating to prevent water hammer. Can I accomplish this with a capacitor and a resistor or will this just create a delay in operating circuit with the same operating speed?





RE: Solenoid coil drop out speed
Even if you convert to a DC valve, you will probably not get anything but a delayed off. The magnetics will keep the valve open until it can't hold it any more. And the plunge moves just about as fast regardless of how you reach that point - be it fast AC off or slow DC off. You need a valve that closes slowly to avoid water hammer.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Solenoid coil drop out speed
RE: Solenoid coil drop out speed
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Solenoid coil drop out speed
You might want to ask the question in the HVAC forum, or maybe the Valve Engineering forum. The valve people are usually more biased toward industrial process control, so my bet is with the HVAC guys: forum403.
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Sometimes I only open my mouth to swap feet...
RE: Solenoid coil drop out speed
I bit the bullet and purchased the slow closing (2500 msec) solenoid valves, rather than trying to do product development at our customer's location. The high cost and low availability of slow closing solenoid valves prompted me to explore another way.
RE: Solenoid coil drop out speed
I built one for my bathroom sink. I have a $700 IR no hands bathroom fixture and it shuts off so fast all the pipes in the house rattle and sleeping people get woken up.(ridiculous!)
I built a surge tank out of PVC fittings and put in a smaller orifice to create an RC. Works fine.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Solenoid coil drop out speed
RE: Solenoid coil drop out speed
That almost sounds like "Slow on-off just isn't a solenoid valve feature: most valves of this size use the solenoid to control a pilot line to a diaphragm" doesn't it!
tgcoakley,
For our collective benefit, where did you find slow-acting solenoid valves? Do you have a manufacturer and part number? Good to know you got things sorted out.
RE: Solenoid coil drop out speed
RE: Solenoid coil drop out speed
Burkert German) makes a solenoid valve that is slow closing. It and the ASCO Vave 8221 series are somewhat expensive, but they work without surge eliminators, which in our 2" 80 psig existing laundry room application might require some trial and error to get it right.
RE: Solenoid coil drop out speed
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Solenoid coil drop out speed
water hammer damage more effectively than other techniques."
ht
This vendor indicates either stock of 3-5 day availability of several models:
http://www
Dan
RE: Solenoid coil drop out speed
Thanks tgcoakley and Danw2.
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Sometimes I only open my mouth to swap feet...