Ok, Glenn Sorry for the delay. Been a busy week so far at work.
I was wrong when I told you about the aeroquip check valves. Im shure they make them, But like you I have yet to find them in the couple hundred pages of literature we have floating around the office.
Anyways I found the Check valve demo I had laying in my desk today and its made by "Kepner Products"
Here Is a link to one of their check valves, Its identical to the one im holding in my hand.
Altho Im shure the Specs are wildly different as ours are used in Fluid environments at over 3k psi.
But this should get you in the ball park.
Gl, buddie
Edit: Found the Eaton aka Aeroquip check valve, The main page is located
Here.
Your Body style is located
Here, This is a Direct link to the PDF file.
Prices from these 2 companys will vary greatly. I would recomend you call them with part numbers and work out the fine details, sutch as Oring types for various fuels and the correct cracking pressures you may need. They will also beable to help you find the manifold to mount the 2 valves needed to a duel FP setup.
Second edit:
So I chatted with my Guy that plumbs all of our reels. He tells me that to do this properly. you would need 2 check valves and one T fitting.
Basicly FP, Check valve,(for both Pumps) then the T fitting. (Duh
)
He also recommends the Lowest cracking pressure you can get that will Reliably Reseal, under a no pressure setting. aka 1-5psi. He tells me we run a 5psi crack on our 3k psi lines.
And that If you go with Swagelok check valves that you must use Swagelok fittings. Standard AN or NPT wont work as it will not seal.
Aeroquip aka Eaton or Kepner does not use anything special and can be configured in either AN or NPT.