air line question

JohnJohn

Member #42

Location

Austin, Texas

• Sep 19, 2004

• #1

I have air flowing through 1/2 tube at 120psi going into a pressure regulator, coming out then converting to 1/4" tube. If I set the pressure to 50psi will the down stream pressure increase due to the decrease in hose size?

Thanks,

 

What Rd

NAXJA Forum User

Location

Athens, IL

• Sep 19, 2004

• #2

JohnJohn said:

I have air flowing through 1/2 tube at 120psi going into a pressure regulator, coming out then converting to 1/4" tube. If I set the pressure to 50psi will the down stream pressure increase due to the decrease in hose size?

Thanks,

Click to expand...

Nope. No problem.

 

K

Kaczman

Lurker

NAXJA Member

Location

Brighton, CO

• Sep 19, 2004

• #3

Nope.

-Jon

 

JohnJohn

Member #42

Location

Austin, Texas

• Sep 19, 2004

• #4

Thanks.

 

What Rd

NAXJA Forum User

Location

Athens, IL

• Sep 19, 2004

• #5

JohnJohn said:

Thanks.

Click to expand...

Yep.

 

CharlesS

NAXJA Forum User

Location

Quezon Province, Philippines

• Sep 19, 2004

• #6

The pressure will remain constant, but the volume (cfm) that the 1/4" hose can move will be less than what the 1/2" hose can move. This can cause the pressure in the line to drop off if the volume of air used is more than what the 1/4" air line can move.

Charles

 

B

Beezil

Member #Nay

NAXJA Member

Location

Indiana-Missouri

• Sep 20, 2004

• #7

that johnjohn is one smart cookie.

 

S

Sparkman

NAXJA Forum User

Location

Ludlowville, NY

• Sep 20, 2004

• #8

Actually, as the size of the pipe goes down, the velocity goes up and the pressure goes down. Aka venturi.

http://home.earthlink.net/~mmc1919/venturi.html

 

What Rd

NAXJA Forum User

Location

Athens, IL

• Sep 20, 2004

• #9

Sparkman said:

Actually, as the size of the pipe goes down, the velocity goes up and the pressure goes down. Aka venturi.

http://home.earthlink.net/~mmc1919/venturi.html

Click to expand...

He's running an air-actuated locker, guys. For no more air than that will consume, the problem is purely academic.

 

EricsXJ

NAXJA Member #616

NAXJA Member

Location

Reno, Nevada

• Sep 20, 2004

• #10

Maybe I don't understand regulators but I could not get them to work as desired with my air locker setup. The reason is you can regulate the airflow while the air is flowing through the regulator, but once your locker is engaged the pressure in the line will continue to rise unless you have some sort of valve to block it at or before the regulator. So even though your regulator is set at 50 psi (that seems a little low), the air pressure will be 120 psi in that hose when you decide to engage the locker again.

I had to ditch the regulator idea from my system and just use the pressure switch to keep the air pressure in the desired ranges.

 

CharlesS

NAXJA Forum User

Location

Quezon Province, Philippines

• Sep 20, 2004

• #11

IF you set the regulator to maintain 50 psi... then the pressure should be 120 on the inlet and 50 on the outlet.
Sounds like your regulator was leaking thru....
I used a 75 psi pressure switch to control the compressor for the onboard air and front locker along with installing a 3 gallon pancake air tank installed in the factory spare tire location.

Charles