BeanAnimal overflow: 2nd and 3rd valve necessary?

[FLSharkvictim]

I am getting to install all of my plumbing on my new build and i bought 20'' Synergy External Overflow box which will be controlled by a Spears 1.5inch gate valve but is it necessary to have a 1.5inch ball valve on the secondary drain?

 

[ZoWhat]

Its smart to put a ballvalve on all drainlines bc you never know when a 2nd drain might be carrying a decent % of waterflow and without a ballvalve you cant fine-tune water syphoning noises to a minimum.

I put ball valve on everything to give me future options even though a lot of my vavles has a 99% chance I'll never use them

 

[Crabs McJones]

From my understanding, only the primary drain gets a gate valve, the secondairy drain acts as a durso without a valve, and the emergency is just that, an emergency, unobstructed drain.

 

[madweazl]

Only required on the primary.

 

[paleoreef103]

The second and third drains do not require gate valves, but you should put unions on all your drain plumbing to allow for easier disassembly for cleaning. You adjust the first drain to match the output of your return pump with the tiniest trickle into the secondary drain to keep your overflow silent. The second and third are run wide open so that if your first drain (and for that matter second drain) is clogged they can (noisily) handle the flow from your return pump. This alerts you that something is wrong with your first drain (via drain noise) while preventing a soggy floor.

 

[lapin]

splained above a few times. I cant improve on them

 

[madweazl]

The second and third drains do not require gate valves, but you should put unions on all your drain plumbing to allow for easier disassembly for cleaning. You adjust the first drain to match the output of your return pump with the tiniest trickle into the secondary drain to keep your overflow silent. The second and third are run wide open so that if your first drain (and for that matter second drain) is clogged they can (noisily) handle the flow from your return pump. This alerts you that something is wrong with your first drain (via drain noise) while preventing a soggy floor.

The only caveat I would add to this is that the secondary line is plumbed identical to the primary (with the exception of the gate valve) so that it remains silent in its operation. Some people cut the emergency line above the sumps water level to the splashing noise alerts them to a problem.