steam control valves

[matt9855]

I Am installing 2 steam unit heater in a loading dock of a commercial building. I am going too use 24 volt solenoid valves and was wondering do I need to use modulating valves, or just a open/close type valve. Also do I need to get a aguastat that is rated for higher the 250 degrees. The stem pressure is running at 7lbsin the system.

[absrbrtek]

Its a loading dock, straight open close should be fine. 99% of the loading docks I've seen are on or off, not modulating. JMHO

[crab master]

Second that - only make sure you get valves rated for steam. Not sure on your aquastat question - are you planning on locking out the unit heater if your steam line is cold?

[Jerry Condiff]

Use two way N/O valves rated for low pressure steam. 250 degree stats should work fine. If you require help on the valves contact Mark Mcgahn @ NECC, 1-800-227-9800 He is president of the NAPE Philadelphia chapter.

[jd 07]

Make sure if you use Honeywell valves to get the steam kits or they will not last long.