Need Low dp check valve for gas flow

[hollerg]

I have a gas discharging from a bag house fan into a vent line containing hot water vapor. No problem normally, but if the system shuts down, 300 F moist air/water vapor comes back into the bag house, causing caking fouling out the bags. Geometry makes a water seal a problem.

I have 6" wc dp allocated for cracking & frictional dp for 1500 cfm.

Who should I contact or kind of valve to evaluate

 

[ApC2Kp]

hollerg,

Suggest looking at Techno-chek dual flapper valve, as there were some in lightweight metal or plastic body designs. The Techno-chek product is now part of Cameron valves,

http://www.c-a-m.com

but detailed info might not be available on the site.

 

[JimCasey]

A tank vent valve might serve well in this application.

They are single direction and have a lightweight aluminum pallet. Usual cracking pressure is 1/2 oz. Higher pressues are achieved by weighting the pallet.

Among vendors you might consider: Groth, Varec, Protectoseal....