Filter+Regulator Before or After valve?

[Flapper]

(For Drip systems) I've always seen the filter and regulator after the valve.
It is recommended to have a filter before the valve.
So I thought, why not put the filter + regulator unit before the valve?

 

[Valveman]

It should still work, but the regulator will only let the electric valve have 10 PSI or so, and it might not have enough pressure to keep the valve closed.

 

[Sponsor]

 

[Flapper]

It should still work, but the regulator will only let the electric valve have 10 PSI or so, and it might not have enough pressure to keep the valve closed.

The regulator regulates to 30 PSI. Should be enough.
So it's just down to whether the filter + regulator is designed for constant pressure or not.

 

[Valveman]

The regulator is what maintains the pressure at a constant 30. With the regulator last in line you will have 30 PSI to the drip. If you put the filter and/or the valve after the regulator, the friction loss from these items will decrease the 30 PSI from the regulator to the drip.

 

[Flapper]

How much pressure would it drop?

 

[Valveman]

Depends on the friction loss of the particular valve and filter, and how dirty the filter is.

 

[Flapper]

Depends on the friction loss of the particular valve and filter, and how dirty the filter is.

Just about how much; could it be 10 PSI or is it probably just going to be 1-5 PSI?

 

[winni cheng]

10psi is workable for some pressure regulators!but 1-5 psi is too low..some times can not open the irrigation valve...

 

[Flapper]

10psi is workable for some pressure regulators!but 1-5 psi is too low..some times can not open the irrigation valve...

pressure drop
not actual pressure

 

[winni cheng]

ok.it depends on the pressure regulator. Such as our regulator range is 11 psi~95 psi

 

[Valveman]

Probably about 5 psi, give or take.