Parts #24, front of the engine
Hi,
Could someone explain how are those supposed to work?
Thanks!
Pressure relief valve : how does it work?
Pressure relief valve : how does it work?
Parts #24, front of the engine
Hi,
Could someone explain how are those supposed to work?
Thanks!
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Pressure relief valve : how does it work?
Just a one-way non-return valve, isn't it?
Presumably, a diaphragm of some description inside that permits air to travel in one direction, but not the other(?)
Presumably, a diaphragm of some description inside that permits air to travel in one direction, but not the other(?)
Re: Pressure relief valve : how does it work?
Hi Technik,
I've got 2 sets - 4 in total- of those, and except if they are all broken (could be!) they let air go through both ways at standard pressure. So no, it's not a non-return valve, although there's one in the ventilation system (part #16).
I've got 2 sets - 4 in total- of those, and except if they are all broken (could be!) they let air go through both ways at standard pressure. So no, it's not a non-return valve, although there's one in the ventilation system (part #16).
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Pressure relief valve : how does it work?
It's a pressure limiting valve. It'll allow flow in both directions at low pressure, but close when the pressure (or vacuum rather) increases beyond a certain point, presumably to prevent the turbos trying to suck the contents of the crankcase into the intake. I bet they're dead cheap. Just replace them all and forget about them for a decade.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Pressure relief valve : how does it work?
Thank you Shopp. So what you're saying is that if I close one end and apply vaccum on the other end, it should block the flow when releasing the blocked end. Will try tonight
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Pressure relief valve : how does it work?
I think it probably depends on air flow, which isn't the same as pressure, but related. I could be wrong. I'll be interested to know what your experiments give.
Maybe if you use a vacuum cleaner, that might give you the airflow necessary. Assuming you've got a good one like a Miele.
Maybe if you use a vacuum cleaner, that might give you the airflow necessary. Assuming you've got a good one like a Miele.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Pressure relief valve : how does it work?
It might not even cut the flow entirely. Given the name, it could be that it just limits the flow which would make testing it more challenging.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Pressure relief valve : how does it work?
Kind of matches my 'findings' : with the vacuum cleaner put on the side of the valve, I can see the piston moving up (actually down when the valve is mounted..), but the flow is definitely not cut. It feels like more restricted but honestly hard to tell without real measurements.
Honestly it's still a bit of mystery to me as to what's the main purpose of the thing and how it operates at different engine conditions (idle, boost, deceleration).
Honestly it's still a bit of mystery to me as to what's the main purpose of the thing and how it operates at different engine conditions (idle, boost, deceleration).
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Pressure relief valve : how does it work?
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
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