Underground Valves

[Engnut]

We are petrochemical operator, with little experience in underground buried valves for utility service--firewater, cooling water, potable water, process effluents, sewer, .... We found many of the exisitng U/G valves seized and inoperable. I need to spec out new replacement valves. Please advise what type/make are the performance proven U/G valves!
Eric

 

[Ashereng]

I take it that you mean direct burried valves.

In the pipeline industry here, we try to bring our valves up to the surface via risers.

When we bury valvs, we try to use a "vertical culvert" or "well" down to the burried line such that the valve is still "burried", but not sitting in the dirt or water.

I agree, direct burial is problematic.

 

[cvg]

AWWA specifications are excellent for direct bury water valves. However, the valves need to be operated on a regular basis.

gate valves AWWA C500
butterfly valves AWWA C504
epoxy coating AWWA C550

use a valve box with a debris cap for the operator

 

[Ashereng]

cvg,

Can you describe what a "valve box" and "debris cap for the operator" in more detail? I am not familiar with those terms.

Thanks.

 

[cvg]

a valve box is essentially a pipe or split sleeve which fits on top of the valve and allows the valve to be operated from the surface. a debris cap prevents dirt from getting down onto the top of the valve.

you can see details of a typical installation if you download the following standard drawings. look at details 391 and 392

http://www.mag.maricopa.gov/detail.cms?item=4774

 

[Ashereng]

cvg,

Thank you for the link. I believe we are talking about the same thing.

Our wells/culverts are usually made of galvanised corrugated sheet metal, sunk into the ground around the valve and actuator, extending about 12"-18" above grade, 5'-6' in diameter, ladder access in some instances, and with a lid to keep stuff/people out.

 

[krb]

If you are looking for a specific manufacturer of valves, we use these alot with good results:

http://www.muellercompany.com/test/mueller_water/water_product.php

KRB

 

[Engnut]

Thank you folks for the inputs!

The input summary for U/G valve:
* use 'vertical culvert','well' or 'valve box' to contain and keep valves from the dirt and water.
* use AWWA, rubber-lined valves.
* stroke U/G valves regularly to ensure they are operable.

Thanks again!
Eric