is Danfoss really one-directional?

R. Kalia_4

OK, sorry! I just happen to have this 1" Danfoss valve body, I bought it by mail 6 months ago, and so I can't just stop by the plumbing supply and get a refund.

Maybe I'll sell it on e-bay.

Meanwhile, I measured and I absolutely do not have space for a TRV on the inlet side (because the radiator is in a corner and the inlet is on the wall side). So no TRV for me, unless they make one that goes the other way.

R. Kalia_4

I have a hot water radiator in a corner such that it is not easy to put a valve on the inlet side. The Danfoss valve bodies have arrows indicating flow direction. Why should a TRV care about water flow direction? Is this maybe relevant for steam only? What would happen if I put the Danfoss at the outlet side of the radiator?

Brad White_9

Don't Do It

The flow direction is there for a reason. The valve design is based on the approach of the water flow versus the plug/seat orientation. At high delta-P's you may get "chatter".

Also the thermostatic head position is critical. Wrong orientation may have the head above the body, getting a wrong thermal reading, not indicative of the space.

There may be more reasons, but those are the too I know all too well.

Life is too short to ignore directions.

Unknown

yes, u have to

Yes, you have to follow the flow of the arrow, I did a mistake once and I'm still hearing the noise its made..... However, I ve done the valve at outlet with remote sensor and its worked well, still follow the direction where not to install the remote, behind curtain, dead space in corner, above the radaitor, etc... ( dang, Brad beats me to this post)

Mike T., Swampeast MO

"Chatter" is a bit of an understatment. Think repetitive hammering as the valve attempts to modulate.

R. Kalia_4

> The flow direction is there for a reason. The

> valve design is based on the approach of the

> water flow versus the plug/seat orientation. At

> high delta-P's you may get "chatter".

>

> Also the

> thermostatic head position is critical. Wrong

> orientation may have the head above the body,

> getting a wrong thermal reading, not indicative

> of the space.

>

> There may be more reasons, but

> those are the too I know all too well.

>

> Life

> is too short to ignore directions.



So delta-p is the pro

R. Kalia_4

what about low delta-p?

> At high delta-P's you may get "chatter".


Sorry to be a pest, but in a converted gravity system, low head, would it be okay?

Now rjbphd says it's okay if I use a remote sensor. I don't understand that. Maybe it's a matter of rapid modulation vs gentler modulation? If so, I do have outdoor reset, it's not bang-bang heat; does that help?

Many thanks for helping a newbie!

Brad White_9

I would say

that gravity HW is essentially low head overall BUT the DP at the valve is the same or higher, it being based on flow at that point. Gravity systems have lots of flow, little pressure. Probably not chatter per se but you will still have a delta-P issue and maybe some interesting noises all your own. I really do not know, have never tried that...

Now, if you use a circulator, all bets are off and the pulsing of the circulator will show up at the valve.

Using OD reset will help with expansion noises and affects the temperature of the water, not the pressure in a meaningful way.

Not pesty at all! But you sure seem hell-bent on not following the directions....

Ever go down a street with one of those arrows that says, usually in English, "One Way"?

I rest my case.

Brad White_9

Ahhhh. Grasshoppa!

I probably could use it myself. Make me an offer or put it up on E-Bay and let me know. In fact, do just that.

Can you get another type or style? Or get one on the outlet side with the flow in the right direction of course. Just giving you a hard time about driving and directions, hope you do not mind.

The remote head option is to get the head away from undue influence of the radiator and valve body. No harm in that.

Brad

John Ketterman

I may have found a better solution. I mustered up my courage and called Danfoss. The person who picked up the phone knew what I was talking about! He suggested adding some fittings to mount the valve "backwards" at the radiator outlet. My guess is that it won't be too difficult. It will add a "contraption" to the radiator but it'll be behind a sofa. It will also cost some money but it's the only way I'll get a TRV on this radiator.

Brad White_9

There you go...

I bet I missed out on a good deal...

Watch the head location behind the couch now, John...

The cat gets back there and the room gets cold. Trust me.