Purpose of a hot water return line and a check valve

[AJEEB KHAN]

Please see the RED marked area; The Hot water service (HWS) rretun line having a Check valve what is the purpose of this valve here? also i can see a TEE in the HWS forward and Return line, it's the only thing will be available in the HWS F&R joint?

What i have understood is the HWS F&R pipework is in a circulation mode and from the TEE a pipework will serve the sanitary fixture, Am i right?

 

[ShaunCorbs]

It’s there for the secondary hot water return

Same as the cv by the toilet tmv3 are you installing the pipework?

 

[AJEEB KHAN]

It’s there for the secondary hot water return

Same as the cv by the toilet tmv3 are you installing the pipework?

Yes, i'm installing the pipework.

 

[exedon2]

Don't forget that you cannot use standard plastic barrier pipe on hot water systems with secondary returns.

 

[EvilDrPorkChop]

Not sure why you'd have the Non Return valve there? You'd have it located back at the cylinder with the circulating pump, provided that's the furthest point.

 

[ShaunCorbs]

Not sure why you'd have the Non Return valve there? You'd have it located back at the cylinder with the circulating pump, provided that's the furthest point.

Commercial system have many legs off a src main not practical to run each back to the pump separately

It’s to stop the draw off being used instead of the main hot water service eg water doesn’t flow from the src

Edit as it missed part of the message off