- Thread starter Barlidge
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Al Strachan
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A Dowty washer. Viscosity of 46 tends to be the norm in the UK including offshore/marine, but for really cold and depending on the system you could drop to 32. (Shell tellus 46 or 32)
Barlidge
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Thanks you.
Are you sure? They were supplied new as a pair and I dont think its a push in connector and there's no valve in the hole, the knurled collar has an internal thread that screws up on to the the pressure gauge, i thought I was just missing some kind of sealing washer.
pressbrake1
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from what I can see the whole set up seems very wrong like theres a missing tee junction ie pump to cylinder to gauge.
I wouldnt use anything too thick with a hand pump and certainly iso 46 as the return will be very slow. Its used in a lot of machines as its better with higher temperature s
I put 32 oil in my press and its a pita in the winter
I wouldnt use anything too thick with a hand pump and certainly iso 46 as the return will be very slow. Its used in a lot of machines as its better with higher temperature s
I put 32 oil in my press and its a pita in the winter
pressbrake1
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Dowty wont seal inside a thread the thread needs to go inside the dowty
Al Strachan
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Dowty washers work fine as long as the pressure is internal. The pressure pushes the rubber to create a seal, it doesn’t rely on threads pushing the rubber from inside, the pressure does this. I guess if it’s a concern you could use a fibre washer, but personally I’d have a Dowty in there.
8ob
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Bruce I would say at a guess that the fitting on the red cylinder is just a common portapower type female couple which will have an o`ring inside , if it is you could always screw the gauge into a male coupling with sealer and then into the female coupling. https://www.ebay.co.uk/i/273469852092?chn=ps
If I am wrong forgive me , I am old yerknow
bob
pressbrake1
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Dont go near any of my hydraulics then!!
AndersK
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That's a press right?
Did you put in that porta power fitting?
I would expect that fitting in a side port and a gauge adapter in top port
If the gauge fitting has a flat bottom a dowty ( if diameter fits) or a plain cope gasket will work just fine but there are dedicated metal seals for that.
Did you put in that porta power fitting?
I would expect that fitting in a side port and a gauge adapter in top port
If the gauge fitting has a flat bottom a dowty ( if diameter fits) or a plain cope gasket will work just fine but there are dedicated metal seals for that.
Rig Pig
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I think what Al meant is to use the dowty as a face seal where the cutting ring would be in a gauge adapter.
And we use AWS15 in our Enerpacs.
Barlidge
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Inside there is an o ring but nothing else, the hole goes clean through.
]
How it arrived when I bought it with a blanking plug in:
Base of the gauge:
This is the same one as mine but pictured off ebay, it looks like the fittings different to mine:
These are the fittings I have on my pipes:
Yes Bob, it does have an o ring inside, hadn't noticed that before.
How it is in the pictures is exactly how it arrived.
]How it arrived when I bought it with a blanking plug in:
Base of the gauge:
This is the same one as mine but pictured off ebay, it looks like the fittings different to mine:
These are the fittings I have on my pipes:
Bruce I would say at a guess that the fitting on the red cylinder is just a common portapower type female couple which will have an o`ring inside , if it is you could always screw the gauge into a male coupling with sealer and then into the female coupling. https://www.ebay.co.uk/i/273469852092?chn=ps
If I am wrong forgive me , I am old yerknow
bob
Yes Bob, it does have an o ring inside, hadn't noticed that before.
That's a press right?
Did you put in that porta power fitting?
I would expect that fitting in a side port and a gauge adapter in top port
If the gauge fitting has a flat bottom a dowty ( if diameter fits) or a plain cope gasket will work just fine but there are dedicated metal seals for that.
How it is in the pictures is exactly how it arrived.
It looks like somebody has replaced the proper portapak hose with a standard hydraulic hose & used taper seal fittings.
Your hose should be like the one in the photo. The rh end screws into the pump & seals using plumbers tape. The lh end fits into where you are trying to fit the gauge. It seals against the o-ring & you hand tighten the knurled nut. It is there so that you can easily separate the pump & ram without needing spanners. There is a valve in the end of the hose & there should be one on the ram to stop oil leaking out when you split the joint.
Looking at the setup I'm assuming you are using this for an hydraulic press? If so you will never need to separate the pump & ram so the existing hose will be fine.
If you remove that fitting the hole in the pump looks like 1/4 BSP & the gauge could be the next size up, 3/8 bsp but the thread pitch looks too fine. You will need a step up m/f adaptor or a 1/4 x 3/8 nipple & a 3/8 barrel, seal the joints with a loctite 542 or plumbers tape. Best thing would be to bring it to an hydraulics place to get the correct fittings. If it is for a press you could get a hose made with the correct ends for your ram & gauge & mount your gauge in a more convenient place.
As regards the oil grade, common hydraulic oil grades are 15, 22, 32, 37, 46, etc, the higher the no the thicker it is. I would use 22 grade. 15 is a bit too thin & 32 gets thick in the cold weather.
Your hose should be like the one in the photo. The rh end screws into the pump & seals using plumbers tape. The lh end fits into where you are trying to fit the gauge. It seals against the o-ring & you hand tighten the knurled nut. It is there so that you can easily separate the pump & ram without needing spanners. There is a valve in the end of the hose & there should be one on the ram to stop oil leaking out when you split the joint.
Looking at the setup I'm assuming you are using this for an hydraulic press? If so you will never need to separate the pump & ram so the existing hose will be fine.
If you remove that fitting the hole in the pump looks like 1/4 BSP & the gauge could be the next size up, 3/8 bsp but the thread pitch looks too fine. You will need a step up m/f adaptor or a 1/4 x 3/8 nipple & a 3/8 barrel, seal the joints with a loctite 542 or plumbers tape. Best thing would be to bring it to an hydraulics place to get the correct fittings. If it is for a press you could get a hose made with the correct ends for your ram & gauge & mount your gauge in a more convenient place.
As regards the oil grade, common hydraulic oil grades are 15, 22, 32, 37, 46, etc, the higher the no the thicker it is. I would use 22 grade. 15 is a bit too thin & 32 gets thick in the cold weather.
Barlidge
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Thanks all, something definitely isn't right, yes its destined for a press, been sat on the bench 2 years and only just turned down a mounting plate 2 months ago, it may get there one day. Will drop by a local hydraulic shop and get the to check the hose is actually suitable and advise on connections.
