1 reply to this topic

[Doggert]

I have an application where I need to limit flow to one direction only in a thermal oil cycle.

I have a main thermal oil loop at approximately 3 bar, and a secondary loop for some equipment at 1.5 bar which gets its "feed" from the main loop. My problem is that the 3 bar main loop overpowers the 1.5 bar circulation line, and I end up getting higher temperature oil in the system when I don't want it.

The loop needs free exit access to the main return line - however, there is an oppurtunity for higher temperature oil to use this line and fight against the pump into the system.

An obvious solution to this issue is to place a check valve in the line after the circulation pump to keep the new hot oil from entering at this point - but I am wary of a check valve in a thermal oil system because I'm not sure if the oil will eventually "gum up" the valve and render it useless.

Does any one have any experience in using check valves or other forms of enforcing one-way flow in a thermal oil line?

Thanks.

[djack77494]

Doggert,
Assuming that this is a relatively clean service, as I would guess it is from your description, then I do not understand your reluctance to employ a check valve. Check valves are very widely used in many services, quite a few of which present challenges such as solids, fouling, corrosion, extreme conditions, etc. There are several types available which use different principles and have differing positive and negative attributes. I would talk to some of the vendors and ask them. Check out the literature also. If you're still not satisfied, then I would suggest you get very specific - describe your fluid(s), impurities, process conditions, etc. Then ask for others to share their experiences with that system.
Doug