- Thread starter rizla13
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Seadog
Save the planet. It's the only one with rum!
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The unloader only operates as the motor is de-powered. If the motor carries on running into the red then the pressure switch is not operating properly. But, since the unloader mechanism is operated by the pressure switch opening, fixing that would allow the unloader to function normally. The safety valve would (should ) operate if the pressure reaches the safe limit, but it will not normally switch off the compressor, just bleed air.
Hi,
May I politely please ask not to be contradicted when I post information in good faith knowing it to be true.
I stated quite clearly the unloader valve was on my Hydrovane compressor. When I realized there was a dangerous fault I posted here for for advice because I'm not an expert in anything and never will be or want to be;
https://www.practicalmachinist.com/
This is the biggest technology forum on the web and I wasn't at all amused by being put down for asking a question whilst being a lowly home workshop owner; one member even stated I shouldn't be on the forum; at the time I couldn't find any information to help me so on this forum I created the information by stripping and repairing my Hydrovane.
I welcome being corrected if I make a mistake after all I'm not perfect.
I'd be obliged Seadog if you would kindly indulge me and explain here on the forum how a fixed speed Hydrovane without automatic stop start switch and no receiver controls output pressure; I'm always willing to learn.
Kind regards, Colin.
May I politely please ask not to be contradicted when I post information in good faith knowing it to be true.
I stated quite clearly the unloader valve was on my Hydrovane compressor. When I realized there was a dangerous fault I posted here for for advice because I'm not an expert in anything and never will be or want to be;
https://www.practicalmachinist.com/
This is the biggest technology forum on the web and I wasn't at all amused by being put down for asking a question whilst being a lowly home workshop owner; one member even stated I shouldn't be on the forum; at the time I couldn't find any information to help me so on this forum I created the information by stripping and repairing my Hydrovane.
I welcome being corrected if I make a mistake after all I'm not perfect.
I'd be obliged Seadog if you would kindly indulge me and explain here on the forum how a fixed speed Hydrovane without automatic stop start switch and no receiver controls output pressure; I'm always willing to learn.
Kind regards, Colin.
the snooper
getting older by the day
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Hydrovanes run continuously they don't switch off
DavidL
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- nr Wigan, Lancs - UK
As someone who knows nothing about screw compressors (and I appreciate my query isn't directly helpful to the OP - sorry rizla!), but I was interested to learn a little more about this.
@Retired - so it seems that on a screw compressor, the unloader doesn't quite work in the same way on a piston compressor - i.e. it's used to allow the compressor to keep running (albeit "unloaded") rather than stopping/starting the compressor routinely in response to pressure - is that right?
Based on snooper's comment - does it ever turn (proper) off in routine operation?
--- edited to add - lazy me - googled it, and yes, that seems about right. It seems some screw compressors do turn off after a certain period of unloaded operation. Every day is a school day
@Retired - so it seems that on a screw compressor, the unloader doesn't quite work in the same way on a piston compressor - i.e. it's used to allow the compressor to keep running (albeit "unloaded") rather than stopping/starting the compressor routinely in response to pressure - is that right?
Based on snooper's comment - does it ever turn (proper) off in routine operation?
--- edited to add - lazy me - googled it, and yes, that seems about right. It seems some screw compressors do turn off after a certain period of unloaded operation. Every day is a school day
Seadog
Save the planet. It's the only one with rum!
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- NE London - UK
Free-standing, but what about if they're coupled to a receiver?
David, I think that you'll find they're rotary vane compressors.
DavidL
Member
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- nr Wigan, Lancs - UK
daleyd
Member
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- Wrexham, North Wales
I'd say that the unloader valve on your hydrovane is doing a different function to the one one a "normal" piston compressor with receiver.
It may well be that fixing the unloader valve cured your issue, but it's unlikely to be the cause of the OP's trouble, as his is a different design.
Edit, sorry just noticed @DavidL above posted similar!
http://www.motivairstore.co.uk/Detprod.asp?ProductCode=S020122
Would this pressure switch fit my compressor? It’s got unloader valve built underneath?
Would this pressure switch fit my compressor? It’s got unloader valve built underneath?
Ok. One more thing
The MDR1 pressure switch is supplied with a delayed unloader valve (AEV 1S) as standard. If you need an unloader valve without delay (EV 1S), this can be ordered separately.
will i need the standard delayed valve or without delay valve?
The MDR1 pressure switch is supplied with a delayed unloader valve (AEV 1S) as standard. If you need an unloader valve without delay (EV 1S), this can be ordered separately.
will i need the standard delayed valve or without delay valve?
