how is this valve suppose to work?

[Xfaxman]

I have never seen anything like that. Could you post pictures of the manifold, some different angles and not too close up?

 

[martini64]

I have never seen anything like that. Could you post pictures of the manifold, some different angles and not too close up?

Here are some photos. I am not near to my digger at the moment, so can't take any more photos just yet - but let me know what you need and I'll see what else I have, or I will take pictures later and post them.

 

[martini64]

There are no labels identifying the brand of the machine or where it came from - however there is a label on the manifold with an address in France. This is where it gets a bit strange - it turns out the company is H. K. Porter, the US manufacturer of locomotives. It seems up until about 1977 they made hydraulic systems in France.

 

[Xfaxman]

Well I was hoping someone with experience on the valve manifold would see it and be able to help.

Here is the relief valve in question:

This should show who made the valves:

 

[martini64]

Yes, that is the valve in question.
The label you point out is slightly different to the one I mention just before. It is a company called ACX (? bit worn), which I assumed made the valve it is on - there is no address or other info, so I couldn't get anywhere with this.

 

[martini64]

I went back to some old photos, when I first restored the machine years ago - the label was more readable then and I noted that the label you pointed out said Abex and Denison.
Denison is an old hydraulics company in France. I will chase this up. Thanks for pushing me in this direction - I had forgotten all about that label.

 

[Xfaxman]

You're welcome. My best guess is that one is a crossover type relief valve, to set the maximum pressure going to the valve block.

Hope they made the valve block also, and you can get the info that you need for it.

 

[martini64]

Here is a drawing of the flow/connectivity - please excuse the rough drawing; I hope it is understandable, and helps.

Thank you for all the replies on this; I think I realise my issue. Can't test just yet, as travelling, but pretty sure this is the problem.
Having drawn the flow and looked back at old photos - thanks guys for pushing me to do this - I realise I am an idiot! I have it connected the wrong way round!
In my flow diagram, the pressure line should be going into the block with the relief valve in question - I can then see how it works.
Occam's razor I suppose.

 

[Xfaxman]

All's well that ends well. :thumbsup: