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Solenoid Valves

Looking for some advice on the design of a solenoid valve, actually on the best way to make a seal around the valve stem shaft. Would an "O" ring be suitable, or would conventional packing compressed with a nut be better? It will be handling air at around 40-60 psi at a large flow volume and will be powered by 12v DC, and the valve disk will be mounted on the end of a brass pull rod attached to the solenoid plunger. Because of the solenoid's limited pulling power, friction between the rod and the seal needs to be kept to a minimum. The valve itself is just a simple open-closed type and the rod will have a maximum travel of about 5/8", any help appreciated. Already checked commercial sources and off-the-shelf solenoid valves either have too small a pipe size (needs to be 1/2" IPS minimum), won't work on 12v DC or are way to costly for my budget. Mike

Reply to
MikeM
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Go to an irrigation wholesaler and ask for a Toro PIN type hydraulic valve and a solenoid actuator to drive the same. 12V will activate the actuator just fine, and the hydraulic valve can be adjusted accordingly for flow needs. About $20...

Reply to
Bill P

Reply to
David Billington

I smell a pumpkin chucker!!!

Reply to
Tom Gardner

Heh, lets just say it's an expermental setup. Bill, I am very surprised that such a valve would only cost $20 since the other sources I checked were asking several hundred each, but will definitely check into it further. Dave, I considered that idea but I was thinking of adapting an existing 12V solenoid coil which doesn't look like it would be airtight under 60 psi. Thanks for the help all. Mike

Reply to
MikeM

Go look for an air-actuated butterfly valve - I found a 2" one at a garage sale several years ago for some silly Gloat-worthy price like $2 (and immediately thought "Small Punkin' Chucker" and grabbed it!) and I'm sure they make them a whole lot larger...

They have an air motor to flip the butterfly with shop air (or you could use a CO2 or N2 cylinder), and a 120V solenoid built in to control the shop air. All you'd have to do is find a 12V DC solenoid coil that fits - or use an inverter to change the available 12 VDC into the small amount of 120VAC you'd need to actuate it in the field.

Failing that, you could build your own fast-acting valve with a big ball valve, and rig a small air cylinder with a bracket and clevis to throw the handle full off to full open in a few tenths of a second.

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Reply to
Bruce L. Bergman

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