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Any irrigation folks here?
#319186 08/19/10 10:24 PM
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RickF Offline OP
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I know this is a long shot asking here but does anybody know if the hydraulic valve downside of the pump is still needed if changing the system from the older manual indexing manifold to solenoid valves on a spring well system?

My source of information is out of town for the week and my luck ran out with google.


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Re: Any irrigation folks here?
RickF #319192 08/19/10 11:12 PM
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If the hydraulic valve is part of the pump/ballast tank system, then yes you should still need it. If the hyd valve is part of your manual indexing manifold, then you shouldn't. It should be a direct replacement.

Scott


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Re: Any irrigation folks here?
a401classic #319193 08/19/10 11:14 PM
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dang it Scott, exactly what I was going to say. smile


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Re: Any irrigation folks here?
SirQuack #319196 08/19/10 11:21 PM
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Sorry, Randy. Great minds and all... wink


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Re: Any irrigation folks here?
a401classic #319197 08/19/10 11:23 PM
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Scott our system does not have a ballast tank, the flow well is plumbed directly to the pump and the independent hydraulic valve is plumbed just on the output side of the pump prior to the current manual indexing valve so that the flow well will not free flow to and out of the sprinkler heads while not operating. I'm thinking with the new solenoid valves there will not be a need for the hydraulic valve because the solenoid valves (in my mind) will have a positive shutoff while not in operation?




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Re: Any irrigation folks here?
RickF #319200 08/19/10 11:29 PM
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Brother Bob,

If the hydraulic valve is self-actuating, so to speak, as a function of reduced downstream pressure, then the solenoid valves would be a replacement in kind and therefore not needed.

If the actuation of the hydraulic valve tells the pump to turn on, then it would still be needed... Unless you tie the solenoid signal to the pump switch.

I guess as with speakers, a picture or diagram would go a long way. You wouldn't happen to have a P&ID drawn up, would you?

Scott


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Re: Any irrigation folks here?
a401classic #319201 08/19/10 11:33 PM
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Originally Posted By: a401classic

If the hydraulic valve is self-actuating, so to speak, as a function of reduced downstream pressure, then the solenoid valves would be a replacement in kind and therefore not needed

Scott


That's exactly what the hydraulic valve is being used for and I also did not believe it would be needed with the new solenoid valves installed.

I'll scramble up a picture ... give me a few minutes.


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Re: Any irrigation folks here?
RickF #319205 08/19/10 11:53 PM
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Hmmmm. The more I think about this... Most irrigation solenoids use line pressure (high) on a diaphragm to close the valve. If the pressure in the water line drops to well pressure (low) when the pump turns off, that may not be enough to keep the irr valve closed. Keeping the hyd valve in the system may lock in the line pressure between it and the solenoid and keep the irr valve closed? Does that make sense to you?

Gotta run out for dinner and some shopping. I'll check in later.

Scott


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Re: Any irrigation folks here?
RickF #319207 08/20/10 12:00 AM
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Here we go.

Top photo shows the existing setup with the hydraulic valve on the output side of the pump between the pump and the filter and on out to the old manual indexing valve.

Second photo shows the solenoid valves and manifold that will replace the old indexing valve.

I'm thinking with the addition of the solenoid valves I can eliminate the hydraulic valve?








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Re: Any irrigation folks here?
a401classic #319208 08/20/10 12:03 AM
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Originally Posted By: a401classic
Hmmmm. The more I think about this... Most irrigation solenoids use line pressure (high) on a diaphragm to close the valve. If the pressure in the water line drops to well pressure (low) when the pump turns off, that may not be enough to keep the irr valve closed. Keeping the hyd valve in the system may lock in the line pressure between it and the solenoid and keep the irr valve closed? Does that make sense to you?

Gotta run out for dinner and some shopping. I'll check in later.

Scott


I understand what you are saying, I just wasn't aware exactly how the solenoid valves work. Have a good night out, we'll catch you tomorrow.


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