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No. Some old-school plumbers and pipefitters believe that unions should be installed in one specific direction, and some apprentice training books even say so, but this is only a bit of folklore that has no basis in fact. Anvil International, the maker of most steel pipe fittings, has an illustration http://www.anvilintl.com/ProductSearch/ProductInfo.aspx?ProductId=9960 of an assembled union which shows no internal impediment to flow. Nowhere in any of Anvil's product literature is there any installation instruction regarding flow direction. Control valves and check valves, which do have directional requirements, have flow arrows stamped onto them, but unions do not. Additionally, the circuit setter valves (such as those made by Bell & Gossett) with union ends are installed with the union end facing opposite directions relative to flow (i.e., male end upstream on the return valve and male end downstream on the supply valve).
What else can I help you with?
Is there such a thing as a flow directional pipe-fitting union?
yes
How do i extend a bathroom sink faucet pipe that is too short?
You can extend the faucet pipe by, getting an extra metal pipe and welding it with the faucet pipe and it shall be extended.
Can you use pipe unions in Natural gas lines?
Yes, pipe unions can be used in natural gas lines. However, it is important to ensure that the selected pipe union is rated for use with natural gas and meets relevant safety standards to avoid leakages or other potential hazards. It is recommended to consult with a professional or local regulations to ensure the proper selection and installation of pipe unions in natural gas lines.
Is pipe dope used in joining copper unions?
No pipe dope is to be used on the brass seats they will seat dry.
Is hypothesis performance is affected by expectation directional or non directional?
directional
What is SIC 3494?
This category includes establishments primarily engaged in manufacturing metal valves and pipe fittings, not elsewhere classified, such as plumbing and heating valves, and pipe fittings, flanges, and unions, except from purchased pipes.
What is uni-directional and bi-directional automatic watch?
is address bus uni or Bi-directional
What is the directional properties of antenna?
omni-directional is the opposite of directional. A directional antenna receives or sends more signal from or to the front than the sides or back.
Are Goodyear tires directional tires?
Some are directional like the eagle F1, however most are not directional.
Who are the top directional drilling contractors in north America?
precision directional drilling sub contractor rc directional
The prediction that alcohol slows reaction time is?
Directional
What are directional integers?
There are no directional integers. Perhaps you are thinking of vectors.
