Motorized vlv w/end switch for vacuum steam system

bobbyg_9

I can't seem to find a motorized vlv w/end switch like Dan describes in his vacuum steam system (tech topics). Can anyone help me out with a brand & model. I need a 1" for my application. Would a hot water zone valve work? I was looking for a solenoid valve, but can't find one with an end switch. Thanks for any help, I really appreciate it.


From Dan Holohan's "Hot Tech Topics" - Vacuum Steam Systems.

"When you have both a vacuum pump and a boiler-feed pump, the boiler feed pump will be closest to the boiler. When the vacuum pump starts, it will pull vacuum right back to the boiler's waterline. As the vacuum forms within the boiler and the system piping, atmospheric pressure inside the boiler-feed pump will push water from the tank’s reservoir and into the boiler, causing the boiler to flood. It's a common problem and one that can have you scratching your head.


To solve the problem, install a motorized valve on the boiler-feed pump's discharge line. Then use the boiler-mounted pump controller to operate the motorized valve, and have the valve start the boiler-feed pump through its end-switch. A simple, and relatively low-cost solution."

JJ_4

Here are a few....

with endswitches. Not sure what size you would need. Others on this site would know. The Erie has a model for low pressure steam....I'm not sure of the Honeywell or Taco.

Erie

https://shop.solardirect.com/pdf/water-heaters/solar-hot-water/active-solar/valves/erie-emv.pdf

Honeywell

http://pexsupply.com/product_dtl.asp?pID=3658&brand=Honeywell&cID=281

Taco

http://www.taco-hvac.com/uploads/FileLibrary/ZoneValveBroch.pdf

bobbyg_9

thanks. I appreciate that.
I'll see if I can find the Erie.