[Kiril]

In terms of having the valve closer to the point of use for starts

Place your manifold within site of the zones it controls

Less volume of water to weep at lowest point.

Not a good reason. Properly placed manifolds and use of appropriate materials will make this a non-issue.

Less static head pressure on slopes.

See last answer.

Designing correctly is a no brainer but there seems to be a lot of no brainer designs too. Calling this best practice you avoid excessive weeping in cheap systems using standard heads and the problems associated with the recharging.

See last answer

More likely to be able to successful up-grade with check in heads on systems on slopes.

If the HO's decides to install a flower bed in part of the zone, you can split the zone easier if there is a spare wire and the valve is in the middle of the station. In other words, it provides more options in the future.

See last answer

May not be a whole lot better but it is better. I know you would take into account all those things when designing. If need be, you would move the valve to a similar elevation of the zone as a matter of best practice and perhaps not even need to include a in head check.

This is a matter of opinion, not a statement of fact, which is why I asked you to demonstrate mathematically in terms of hydraulics.

 

[mrsteve]

Why .... and explain mathematically in terms of hydraulics.

Design the system right the first time.

Hydraulics are a known quantity and can be figured both ways just fine. It may be a bit of a geographic situation. Here we mostly trench (rocks etc.) and a center fed valve reduces pipe size and leaves options if needed. Say the pressure changes after the system is in (variety of reasons) and now your design is weak. You can make changes to lesson the demand if center fed. I see way too many residential systems that can't stand one more head added. Say the landscape is modified and you need another head or two for better coverage, sorry Charlie. I just like to keep my options open, maybe a different climate and location kind of thinking. We are all different. I've never seen a barbed valve except for drip tubing.

 

[Wet_Boots]

We are the Poly People

[youtube_browser]HjOhJigFSzk[/youtube_browser]

 

[Duekster]

So Kril, you are saying to install the manifold within the zone it controls?
Granted, it is not centered but that is a long shot from the way many irrigation systems are manifolded.

 

[Kiril]

Hydraulics are a known quantity and can be figured both ways just fine. It may be a bit of a geographic situation. Here we mostly trench (rocks etc.) and a center fed valve reduces pipe size and leaves options if needed. Say the pressure changes after the system is in (variety of reasons) and now your design is weak. You can make changes to lesson the demand if center fed. I see way too many residential systems that can't stand one more head added. Say the landscape is modified and you need another head or two for better coverage, sorry Charlie. I just like to keep my options open, maybe a different climate and location kind of thinking. We are all different. I've never seen a barbed valve except for drip tubing.

Again, properly design the system to begin with.

 

[Kiril]

So Kril, you are saying to install the manifold within the zone it controls?

I am saying install the manifold within eye site of the zones it controls.

Granted, it is not centered but that is a long shot from the way many irrigation systems are manifolded.

It can be centered with respect to the zones it controls, however why does it need to be centered? This is why I asked for the mathematics, and is why I ask for the mathematics every time I see someone say scattering valves all over the property is superior to manifolds.

Out here in manifold central, even the poorly designed systems typically have a manifold for front and back yards for postage stamp residential lots. For larger lots, manifolds are typically "centrally" located (not the same as centered) with respect to the zones it controls.

 

[Duekster]

I am saying install the manifold within eye site of the zones it controls.

It can be centered with respect to the zones it controls, however why does it need to be centered? This is why I asked for the mathematics, and is why I ask for the mathematics every time I see someone say scattering valves all over the property is superior to manifolds.

Out here in manifold central, even the poorly designed systems typically have a manifold for front and back yards for postage stamp residential lots. For larger lots, manifolds are typically "centrally" located (not the same as centered) with respect to the zones it controls.

There is no mathmatical reason as you well know. In some respects, I like having the control valve outside of the station area. I can then excercise the valve without getting soaked.

It is far easier to say "connect the valve to the center of the station as best practice" but this does not mean the valve has to physically located in the center of the station.

 

[Kiril]

It is far easier to say "connect the valve to the center of the station as best practice" but this does not mean the valve has to physically located in the center of the station.

In the past, as a justification/defense for a scattered valve nightmare, some have stated on this forum that centering the valve with respect to downstream laterals produces superior performance.

I will note however there are some cases where isolated valves are warranted for hydraulic reasons. Will 99.9% of the people who contribute to/read this forum ever see this ..... not likely.

 

[Duekster]

There is no reason to scatter valves for the sake of scattering.

The valve should however be within 10 feet of the same elevation and less if practical.

The practice of manifolding has more site condition reasons to abondon it than does placing the valve closer to the point of use.

However, given multiple stations have similar site conditions then cluster or manifold them. Just space them in a decent sized box.

 

[jvanvliet]

All of this is BS since nobody knows what the OP has...

 

[jvanvliet]

somebody stole the solenoids

Damn... that's why it's not working.

Actually getting ready to flush the pipe solenoid ports and valves prior to welding.

 

[FIMCO-MEISTER]

If you space the valves then centering them makes them easier to find. Centered valves that immediately split into a tee have less water hammer issues. Lot easier to keep your valve as the low point of the zone when it's centered and to keep water on both sides of the valve. Like boots says pulling pipe manifolds make way more sense. Contractors that have to use ASV valves are forced to keep those lined up against the house.

 

[Wet_Boots]

still waiting for the Texas ASV install

 

[1idejim]

Posted via Mobile Device

 

[Wet_Boots]

Posted via Baby Turtle

 

[Duekster]

still waiting for the Texas ASV install

Hold your breath too

 

[Oxmow]

I have almost always manifolded my valves. Although I started out using threaded valves in case one shoud "go bad" after doing this for more than a few years, i have realized that most (not all) of the time the valve body isn't the problem.
Most of the postage stamp lawns I do have the manifold next to the backflow. (4-6 zones)
So is it wrong of me to call the "scattered" valves the "Texas method"? Every commercial landscape plan I have put in for a commercial property here in Okla that has been drawn by a Texas architect has scattered valves.
It does seem that alot of the houses here have the water supply on the opposite side of the house than the garage where I typically put the controller. This causes me to have to go around the house with control wire, rather than a charged supply pipe.

 

[DanaMac]

Mostly manifolds here in CO poly country. Now, on large installs, good companies might have 2-4 manifolds scattered around the property. I hate having 10-16 valves or so, all at one spot.

 

[Duekster]

I have almost always manifolded my valves. Although I started out using threaded valves in case one shoud "go bad" after doing this for more than a few years, i have realized that most (not all) of the time the valve body isn't the problem.
Most of the postage stamp lawns I do have the manifold next to the backflow. (4-6 zones)
So is it wrong of me to call the "scattered" valves the "Texas method"? Every commercial landscape plan I have put in for a commercial property here in Okla that has been drawn by a Texas architect has scattered valves.
It does seem that alot of the houses here have the water supply on the opposite side of the house than the garage where I typically put the controller. This causes me to have to go around the house with control wire, rather than a charged supply pipe.

Seems to be the case very often.

 

[mrsteve]

I have almost always manifolded my valves. Although I started out using threaded valves in case one shoud "go bad" after doing this for more than a few years, i have realized that most (not all) of the time the valve body isn't the problem.
Most of the postage stamp lawns I do have the manifold next to the backflow. (4-6 zones)
So is it wrong of me to call the "scattered" valves the "Texas method"? Every commercial landscape plan I have put in for a commercial property here in Okla that has been drawn by a Texas architect has scattered valves.
It does seem that alot of the houses here have the water supply on the opposite side of the house than the garage where I typically put the controller. This causes me to have to go around the house with control wire, rather than a charged supply pipe.

It's scattered and smothered at the waffle house.