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Thread: discharge valve
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22-06-2008, 10:17 PM #1
discharge valve
Hi
Can somebody tell me syptoms of a broken discharge valve???
thanks
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22-06-2008, 11:10 PM #2
Re: discharge valve
head pressure low?
'whistling' in head and pressure equalisation after shutdown?
tell us more...
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23-06-2008, 12:07 AM #3
Re: discharge valve
High discharge temperature
hot compressor
lower cooling capacity
sounds like a lot of questions for one day. Is this for home work?If all else fails, ask for help.
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23-06-2008, 06:51 PM #4
Re: discharge valve
I'll add:
1. High suction pressure
2. High superheat at the evaporator outlet
3. High amp draw
4. Loss of cooling capacity, the compressor runs near
normal pressures but does not cool properly.
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23-06-2008, 07:17 PM #5
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23-06-2008, 08:29 PM #6
Re: discharge valve
For semi-hermetics also:
1)
High blow by = Crankcase pressure higher than suction pressure.
This may cause false differential oil pressure trips.
If the oil check valve is dirty or does not close well or the pressure is applied for long periods of time, all the oil in the crankcase gets pushed to the motor. When the compressor stops, the oil will be magically restored through the check valve that opens.
For hermetics and semi-hermetics:
2) Deformed connecting rods. The piston gets pushed down all the time so no oil enters the upper part of the connecting rod causing wear. The eye of the rod becomes oval shaped.
3) Chemical reactions: Acids + Sludge production. Disolved copper deposited in high temperature surfaces like bearings.
Never experienced high amps but could be if broken valves form an obstruction. You still get low flow (lower amps) but has to go trhough an obstruction (higer amps). It is possible.Last edited by GXMPLX; 23-06-2008 at 08:33 PM.
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23-06-2008, 08:57 PM #7
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23-06-2008, 09:15 PM #8
Re: discharge valve
And, - oil foaming, loss of circulation, poor refrigeration effect, - oh SH*T
I've done it again Teach.
Sorry
Best have a word with Iceman3000 and tell him to stop posting his homework on the forum.!!!
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23-06-2008, 09:25 PM #9
Re: discharge valve
cheers guys
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