Proportioning valve flare nut sizes

[Houston Ben]

Hi All,
I am going to install the wildwood adjustable proportioning valve in place of my original proportioning valve and I am wondering if anyone knows the original nut sizes? Has anyone one replaced theirs with the same and in the stock location?

Any help will be greatly appreciated.

[ray_mcavoy]

The original flare nut thread sizes are:

Front inlet = 1/2"-20 nut on 3/16" line
Front outlets = 3/8"-24 nuts on 3/16" line

Rear inlet = 7/16"-24 nut on 1/4" line
Rear outlet = 9/16"-18 on 1/4" line

The front outlets & rear inlet are both standard size inverted flare tubing nuts for their respective tubing sizes. While the front inlet & rear outlet use special over-size nuts.


By the way, the original valve is more than just a proportioning valve.
Its a combination valve that includes a metering valve, a pressure differential warning switch, and a proportioning valve.

[chengny]

Essentially the same info as ray_mcavoy posted above - just shown in one image: