I recently purchased a brand new Normally Open 453P solenoid for a weep system. I noticed the valve doesn't shut clear off when energized. Thinking maybe it had dirt in it I opened it up and noticed a small hole in the piston which makes me wonder if it is suppose to leak. Is this hole suppose to cool the valve or something while the valve is energized for long periods of time or something? I am tring to decide to send it back or if it is suppose to leak?
Car Wash Forum
This is a sample guest message. Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
Are Dema 453P Normally Open Solenoids Suppose to Leak?
- Thread starter sparkey
- Start date
cantbreak80
Maybe I need new clubs
The hole allows inlet water to fill the chamber above the piston which forces the piston down against the valve seat.
I've not experienced good reliability with the O453P in low pressure applications. It's a high pressure valve requiring a 10psi min inlet pressure.
A better choice for weep systems would be the 1/2" Dema O474P diaphragm valve, requiring only 1psi inlet pressure to maintain closure.
I've not experienced good reliability with the O453P in low pressure applications. It's a high pressure valve requiring a 10psi min inlet pressure.
A better choice for weep systems would be the 1/2" Dema O474P diaphragm valve, requiring only 1psi inlet pressure to maintain closure.
Last edited:
Do yourself a favor and send the DEMA O453P back to whoever you bought it from, you’ll save yourself a lot of frustration and you’ll thank me in the end. The valve you want to use is an ASCO 8210-G34 normally open valve, KR#SA216. The problem with the DEMA 0453P N.O valve is they will hang up in the closed position and everything will freeze, been there and done that. We’ve been using the ASCO 8210-G34 valves for over 25 years. Also put a ball valve in front of the solenoid valve so you can shut off the water in the summer or if you have to do any maintenance on the weep system. I’ve bought a few ASCO 8210-G34 valves on EBay, there are a few on there now.
carwash11147
Member
Ditto on the Dema valves. I used them on my fresh water and reclaim tanks. I fought and replaced those valves multiple times before switching to GC and have not had to touch either one of them in over five years.
