Low pressure cut off valve question

[CanadianRebel]

Hello I am a new EIT and have a question about pressure valves. To summarize the scenario:

A waterline was installed at the bottom of a slough (anchored to the ground; not covered). Because this waterline could potentially be damaged, we want to install a valve that would close if the pressure were to be reduced due to a leak in the line.

We were thinking we would need something that would act in the reverse of an altitude cut off valve. Is there such a thing and where could I find information on this? Thank you!

-CanadianRebel

 

[bimr]

Cla-Val and Singer make valves for this application.

Are you trying to keep the pipe full of fluid? How will the pipe be damaged? Not sure from reading your explanation.

 

[CanadianRebel]

Thanks for the response! So the pipe is basically a service line feeding water from the City water main to a community water system that has wells that are drying up. It spans across a slough into a pump house storage tank that would then feed into a treatment facility to offset the loss of well water. The service line is at the bottom of a slough, so we want to make sure that if some kind of object in the slough hits the pipe and causes a small leak (especially at where it comes out of the slough), the community won't be paying a ridiculous water bill. If there is a valve that would stop water from passing when there is a significant drop in pressure downstream, that would prevent a large amount of water from spilling into the slough at the cost of the homeowners.

-CanadianRebel

 

[bimr]

You can install a pressure monitoring sensor that will read out on the SCADA. Program a low pressure alarm setpoint into the SCADA so that the operator is required to check the system when the alarm occurs.

You can also install an automatic valve that will close when the pressure drops although this is probably not necessary if you have the alarm.

 

[77JQX]

I advise you to think carefully before installing automatic valves to cut off flow. How will the system tell the difference between a leak and a flowing fire hydrant? You don't want to impede flow to a hydrant during a fire.

 

[CanadianRebel]

Thank you for your replies. There are no hydrants downstream. I should have described the scenario better in my original post, but I was trying not to confuse my question with a look at the entire project. I really just want to know if there is such a valve that closes with low pressure downstream. It sounds like I need to look into an electronic/programmable valve. On the Cla-Val website I am looking into the Electronic Control Valves.