I have a Clarke Warrior 60 electric air compressor.

I went to use it and found that while it compresses air fine .. it is not
cutting out when it reaches set pressure .... it just continues 'pumping
until the safety over-pressure valve 'blows'

This is not related to outlet pressure (regulators are fine) but the
pressure that the main cylinder pressure switch operates (or in this case
doesn't)

It has one of the integrated units ...
http://www.machinemart.co.uk/shop/pr...20-amp-1-phase


Anybody know if they are serviceable?

Rick Hughes was thinking very hard :
I have a Clarke Warrior 60 electric air compressor.

I went to use it and found that while it compresses air fine .. it is not
cutting out when it reaches set pressure .... it just continues 'pumping
until the safety over-pressure valve 'blows'

This is not related to outlet pressure (regulators are fine) but the pressure
that the main cylinder pressure switch operates (or in this case doesn't)

It has one of the integrated units ...
http://www.machinemart.co.uk/shop/pr...20-amp-1-phase


Anybody know if they are serviceable?

They are adjustable if you take the top cover off - maybe the
adjustment has drifted. Secondly the over pressure valve might be set a
bit low and tripping before it should - is there a pressure gauge
fitted?

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

"Harry Bloomfield" wrote in message
. uk...
It has one of the integrated units ...
http://www.machinemart.co.uk/shop/pr...20-amp-1-phase


They are adjustable if you take the top cover off - maybe the adjustment
has drifted. Secondly the over pressure valve might be set a bit low and
tripping before it should - is there a pressure gauge fitted?

--


The over pressure valve is not adjustable .. just a plunger spring loaded
against a seat.

There are 2 pressure gauges ..... one for tank pressure other for adjustable
reg outlet pressure.

Assume these pressure regulator work just by disconnecting leccy once tank
is at max pressure ... i.e. tank always at full pressure, and then
downstream reg used for everything else ?

The actual arrangement is - cylinder output is a steel pipe to a tank side
mounted valve .. one side is screwed into boss on tank (air input) on the
valve it looks like the arrangement is a spring loaded plunger .. when
operated (presumably when tank at full pressure) it allows air up a small
bore plastic pipe to the bottom of the Pressure Reg assembly. (which I gave
link to)


I'm not sure if it is this 'bleed feed' that supply's the trip to the
Pressure Reg switch...

The bottom of the Pressure Reg Assembly screws into tank (air out) and the 2
outlets on this Reg provide air feed to adjustable air regulator and a screw
in pressure gauge that measures tank pressure.

After serious thinking Rick Hughes wrote :
The over pressure valve is not adjustable .. just a plunger spring loaded
against a seat.

Your unit sounds pretty much identical to my own...

Mine blows off its seat and re-seals a short while before the
compressor is shut down by the pressure switch. I suspect the spring
might well weaken over time, so my plan is to try fitting a thin washer
under the spring to see it cures it.

I can't remember all of the details, but the outlet pressure regulator
developed a problem of leaking air - I found the 'rubber' seat seals
had some how managed to turn itself completely around inside the
regulator.

Just to repeat, the pressure switch is adjustable.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk