need help with diagram

[firehead]

Hello folks,

Need help understanding this diagram ( how the fuel is running ), more specifically with YVA, YVU, and YVN1. It's a diagram for a heavy fuel burner.

YVA => anti gas valve.
YVU => Nozzle valve.
YVN1 => Solenoid valve.

Any help is very much appreciated. I will post another alternate diagram for the same process if needed. Thank you for taking the time to look at this. Cheers.

 

[LD1]

Go ahead and post the alternate drawing.

I am not sure what you are asking here? The flow path is clearly laid out on the diagram. YVA and YVU appear to be pilot operated valves. That require a certain amount of pilot (incoming) pressure to overcome the spring to actually open and allow flow.

Are you having problems with the unit? If so....what?

 

[davesl708]

Hi and welcome.
What problem are you having? The arrows indicate direction of flow.

 

[BukitCase]

Those look like standard hydraulic schematic symbols, both valves are shown closed with solenoid coil NOT activated - think of the boxes as a sliding spool valve (they usually ARE) - so when the solenoid is energized those boxes will slide up, enabling flow. The Arrow on the flow path indicates that this particular valve also incorporates a check valve for DIRECTIONAL flow -

This

ISO Hydraulic Schematic Symbols - Engineers Edge

or this

Hydraulic and Pneumatic Design and Engineering - Engineers Edge
might also help... Steve

 

[firehead]

First of all, thank you all for takign the time to read and reply.

This is a heavy fuel burner.

There are two cases.

1) Before YVN1 ( solenoid valve ) is excited:

What happens with the flow when it reaches YVA ( Anti-Gas Valve ). YVA has 3 lines connected to it ( 2, 1, and left side/spring symbol ). The fuel is coming in at terminal 2, does it go out from the left side or from terminal 1? Furthermore, what is the role of the dotted ( pilot line here )?

YVU is the nozzle valve how is flow coming to and out of it?

2) After YVN1 is excited, how is the flow affected? The fuel is supposed to come out of EU1 now, how does that happen?

For there to be fire after burner starts, the fuel needs to come out atomized from EU1 ( the nozzle ). This happens after the solenoid vale ( YVN1 ) is excited which happens a short while after the burner starts. I'm basically trying to follow the flow ( from YVA forward ) of the fuel before and after that point.


Please note that I have zero experience with hydraulic diagrams, but some experience with electric diagrams.

Side question, how does the pilot/dotted line behave before and after YVN1 is excited?

 

[LD1]

Here's my interpretation:

Fuel flows into port 2 of YVA. It cannot go anywhere till that valve switches. It switches by pilot pressure. That's the dotted line going to the right. Once a pressure is reached out overcome the spring on the left of the valve, it switches. Then flows into port 1 of YVU. Then it's the same thing. Pilot operated.

YVN1 appears to be a normally open valve returning fuel to tank. Until some condition is met that the solenoid activates and closes it off. THEN it can build pressure and switch YVU via the pilot line.

The line coming off the spring side of YVA and YVU is probably just to return valve leakage back to tank

 

[firehead]

What I understand from your post is the following:

Fuel comes into YVA port 2 and builds up there. Pressure through the pilot line causes valve to open and fuel comes out of port 1/YVA.

Now, fuel continues and goes out of open solenoid valve YVN1 to return to tank ( SEA ). When YVN1 closes, fuel builds up in YVU and comes out of port 0/YVU then continues to EU1.

Okay, regarding vales, what about the third line ( coming out of left side )? There's no flow through that line?

 

[LD1]

What I understand from your post is the following:

Fuel comes into YVA port 2 and builds up there. Pressure through the pilot line causes valve to open and fuel comes out of port 1/YVA.

Now, fuel continues and goes out of open solenoid valve YVN1 to return to tank ( SEA ). When YVN1 closes, fuel builds up in YVU and comes out of port 0/YVU then continues to EU1.

Okay, regarding vales, what about the third line ( coming out of left side )? There's no flow through that line?

Here's my interpretation:

Fuel flows into port 2 of YVA. It cannot go anywhere till that valve switches. It switches by pilot pressure. That's the dotted line going to the right. Once a pressure is reached out overcome the spring on the left of the valve, it switches. Then flows into port 1 of YVU. Then it's the same thing. Pilot operated.

YVN1 appears to be a normally open valve returning fuel to tank. Until some condition is met that the solenoid activates and closes it off. THEN it can build pressure and switch YVU via the pilot line.

The line coming off the spring side of YVA and YVU is probably just to return valve leakage back to tank

Already answered

 

[firehead]

Already answered

Awesome, thank you very much sir.:thumbsup:

 

[LD1]

It is what you pay for it. Its just 'My" interpretation. Without seeing more pictures/drawings/diagrams, or seeing in person, or even understand how the thing works, thats the best I can do.

 

[firehead]

Here is another diagram for the same process with explanation.

 

[LD1]

Here is another diagram for the same process with explanation.

View attachment 473185

Reading that word for word gives one helluva explanation

 

[firehead]

Reading that word for word gives one helluva explanation

Okay, with the functionality out of the way, it's time for the troubleshoot if you're up for it

First of all, YVA, YVU, and EU1 are supposed to be one block as indicated by the dotted line.

What are the symptoms for each if it goes faulty?

 

[LD1]

What are the symptoms for each if it goes faulty?

Instead of trying to play out every symptom of various component failures, why not tell us whats wrong?

A "valve" can fail two ways. Open or closed.

If failed closed no oil will go to the burner.

If failed open, it would be as if the valve was not there, and just a straight pipe instead.

Then there can be failures of leaking oil (internally or externally) where it isnt supposed to, etc etc etc.

Kinda like asking what are the symptoms of a bad tire? (sidewall bulge, hole, dry rot, worn tread, cords showing, etc etc)

 

[firehead]

There's nothing wrong yet.

We bought this burner recently and have no experience with these types of burners.

It's not hard to catch electrical faults, but faults related with the hydraulics can be a bit tougher to diagnose.