sac burp valve- a must see...

(typhoon) · (typhoon) **Join Date: Jul 2001** 05-27-2003, 10:49 AM

there are several variations of this but has anyone ever used one of these to let the air out and close when the water hits it.
www.chemline.com/2002PDF/BallCheck2002.pdf

(ralph) · (ralph) **Join Date: Apr 2002** 05-27-2003, 3:10 PM

Thats not the normal application for this type of valve. Are you sure it will give a drip tight seal? We sell autoair vents for heating systems, these valves would be better suited for this job.

(Message edited by ralph on May 27, 2003)

(typhoon) · (typhoon) **Join Date: Jul 2001** 05-27-2003, 3:19 PM

i am researching currently. i thought the ball valve would seal once the sac is full but allow the air to escape until then. the minimum i found was a 5 psi. what vents are you talking about?

(typhoon) · (typhoon) **Join Date: Jul 2001** 05-27-2003, 3:50 PM

my question is would the ball close prematurely while the sac is still filling?

(ralph) · (ralph) **Join Date: Apr 2002** 05-27-2003, 4:10 PM

If the velocity of the air escaping was large enough I would think it would shift the ball. The valves we have are called auto airvents, these use a float like a carb to move an arm which closes the hole. They are pretty small using a 3/8 thread but will vent a reasonable quantity of air. There is an american brand called mist-o-maid, they should be sub $10. Must be vertical to work!

(ralph) · (ralph) **Join Date: Apr 2002** 05-27-2003, 4:11 PM

Oh and they will suck air when under a vacuum.

tbarrett 05-27-2003, 5:03 PM

Ty, We use a check valve on the vent side of the Rival Ballast System. We put a tee above the check valve and connect a hose from the drain pump at the sack to the tee. With this set up air will vent out of the sack as it fills. When you go to drain the sack the water pressure closes the check valve and drains out of the same hole. Hard to explain but it works very well.

(typhoon) · (typhoon) **Join Date: Jul 2001** 05-28-2003, 6:37 AM

thanks darren. i will look at those.

(typhoon) · (typhoon) **Join Date: Jul 2001** 05-28-2003, 12:47 PM

Found this one that was suggested for perfect application.

Designed for use where space is limited. May be installed in trouble spots previously neglected or improperly vented.

Operation
The valve is always in a closed position until the air collects in the valve shell. When sufficient air accumulates to replace the waer, the float drops and the float lever pulls downward on the self-closing valve, unseating it. As the air passes out of the vent, liquid again fills the valve shell which raises the float, causing the valve to seat once again. As fast as air accumulates, this action is repeated.

For use on systems with pressures up to 50 pounds.
No air chamber required.
Vertical mounting
size: 2 5/8inches x 1 1/2inches
Bright brass finish.