Hydraulic valve symbol

[tom2207]

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[tom2207]

I have a garage press.

The ram is single acting, presume spring return.
View attachment 305345

The pump however is knackered, tried to get seals a while back but they didn't last.



View attachment 305347


I also have this.



View attachment 305346


So I was thinking of hooking it to the press but will need to get a blow off valve at the very least.

simple one way valve with a main pressure relief built in will do , youve a needle type flow controller there that will do for speed control ,, all you need is one valve , and maybe the hose from the hand pump extended . easier than trying to get the solenoid to work again . In fact theres a main pres relief valve built onto that valve slice looking at it , your 95% there , handy looking anvil though.

 

[dan.taylor.1]

Yeah, I've never seen a hydraulic drawing before but that just looks like a simple symbol. Is there a book or guide to what it means?

AFAIK Usually P is pressure from the pump, T is return to the tank, A and B are the outlets from the valve, if there's 2 its double acting, like in and out on a hydraulic cylinder.

 

[MCKDAVID]

excellent start, easy enough to get a self centering directional control valve, can you not pinch one of an old fishing boat winch pack..... sure there will be some kicking about the harbour...

edit just realised you've a single acting cylinder, then don't need auto centering, just a basic 3 way valve, that'll make it simpler to find. .

 

[MCKDAVID]

I have a garage press.

The ram is single acting, presume spring return.
View attachment 305345

The pump however is knackered, tried to get seals a while back but they didn't last.



View attachment 305347


I also have this.



View attachment 305346


So I was thinking of hooking it to the press but will need to get a blow off valve at the very least.

should this not be in show us your anvil thead too..... ahahahahhaha

 

[James1979]

I have a hydraulic valve (solenoid) and am unsure if I am reading the symbol correctly or not.

This is it.


View attachment 305340



What I think is

At rest the A, B, P and T ports are all connected so no pressure at all on any lines.
When left is operated P and B are opened and return flow is A to T
When right is operated P and A are opened and return flow is B and T.

Is that correct?

Yup. That’s what I think.

 

[Bornfree]

I have a garage press.

The ram is single acting, presume spring return.
View attachment 305345

The pump however is knackered, tried to get seals a while back but they didn't last.



View attachment 305347


I also have this.



View attachment 305346


So I was thinking of hooking it to the press but will need to get a blow off valve at the very least.

looks like an adjustable relief valve below the manifold.

 

[carbon]

So I was thinking of hooking it to the press but will need to get a blow off valve at the very least.

That has a pressure control. I’m not sure of the range that it covers but it should be the one marked on the picture.

Adjust the centre set screw out would reduce the pressure and in would increase the pressure

 

[Rannsachair]

I would be a little cautious switching from a handpump to an electric driven pump:

It looks quite a small volume cylinder, how quickly will the electric pump move it without a flow control?

I would want a relief valve at hand level that was easily adjustable, so the pump does not just take the cylinder straight to relief pressure.

May be more controllable/quicker to just fit a second hand enerpac pump with new seals? I like the controllability of a handpump for pressing bearings in etc.

 

[Hood]

looks like an adjustable relief valve below the manifold.

That has a pressure control. I’m not sure of the range that it covers but it should be the one marked on the picture.
View attachment 305351
Adjust the centre set screw out would reduce the pressure and in would increase the pressure

Yes, relief valve right enough, never noticed it.

I would be a little cautious switching from a handpump to an electric driven pump:

It looks quite a small volume cylinder, how quickly will the electric pump move it without a flow control?

I would want a relief valve at hand level that was easily adjustable, so the pump does not just take the cylinder straight to relief pressure.

May be more controllable/quicker to just fit a second hand enerpac pump with new seals? I like the controllability of a handpump for pressing bearings in etc.

There is a flow control valve on one of the pipes so I should be able to regulate the flow via that and make it nice and slow. Screw the blow off out as far as it can go and flow control on highest and see how it performs.
Thought about getting another hand pump but it would cost money and I spent all of mine on a new toy

 

[Hood]

Put the megger on the motor and it is needing dried out a bit so will take it home and if I can time things right I can shove it in the oven when the boss is out

 

[Hood]

I suppose I could even shove a VFD on it to slow the motor down if I found it still too fast.

 

[tom2207]

I suppose I could even shove a VFD on it to slow the motor down if I found it still too fast.

it will be grand , it worked before , so it will work again , the flow control will slow the speed of travel at the ram ...

Pumps dont create pressure , pumps create flow ...... restriction creates pressure .

Thats the bit that some folk dont get at the start , once you have your head round that your flying .

 

[MCKDAVID]

or you could add a bigger ram to suit the higher flow rate, allowing a bigger tonnage then when the frame is now too small for the extra tonnage, you could reinforce the frame to suit, or make a bigger one, the sky's the limit....

hours of fun coming up....

 

[AndersK]

I think what you want is like this to operate a single acting press. You most likely want the press to hold force when releasing the valve and then operate it to let the spring back the ram.

 

[Hood]

Yes, that would be the ideal but I should be able to work with what I have hopefully.

 

[Rannsachair]

Yes, that would be the ideal but I should be able to work with what I have hopefully.

What you have should work though I would prefer adding an in line relief valve prior to the needle valve that you could operate by hand to build up pressure, the complication is how to tap the return line of the relief valve back to the reservoir when the pump and valves all appear integrated.

 

[Hood]

What you have should work though I would prefer adding an in line relief valve prior to the needle valve that you could operate by hand to build up pressure, the complication is how to tap the return line of the relief valve back to the reservoir when the pump and valves all appear integrated.

If I did that I could just put it back into port B which would always be connected to the tank as I would only be operating the right hand side.

 

[MCKDAVID]

^^that would work fine i'd say

 

[Bornfree]

I would put a single acting spool valve on it. So much easier to control. You should pick one up for £50 new. Mine is double acting but much the same.