K14 Elevated CO2

[Agro]

Load change is worst a filter housing can get. My Bauer Oceanus kept pressure in filterhousing for several days. Then I added a Coltri MCH6 filter including so called "PMV", now it's leaking. I make a load change after every filling session. Coltri's PMV does not M (maintain).

Having a gasoline engine without centrifugal clutch meens you must drain the filters, otherwise engine does not start. If you have a centrifugal clutch and a well working PMV you can start engine after one week and you still have pressure inside the filter, so no load change.

I have a centrifugal clutch bot a non well working Coltri PMV. Bad luck.....

 

[Wookie]

I guess I don’t know how Coltri and Rix compressors work, I’m a Bauer and Mako guy, as they are overwhelming the compressor of choice in dive shops and fire stations in the USA.

Y’all understand what the 2 chambers are on the back of the compressors are, right? The first one with the relief valve is the moisture separator, it blows down about every 15 minutes or so with auto drain, every now and again with a manual drain. This is what prevents

Having a gasoline engine without centrifugal clutch meens you must drain the filters, otherwise engine does not start.

Because there should be no back pressure when the moisture separator is drained. After the moisture separator should be a non-return valve, and after the filter tower is a PMV. The non-return valve, with the PMV, should maintain about 1700 PSI of dry air in the filter tower, and if the non-return valve and PMV are working properly, maintain it for months.

I used to rebuild my PMVs annually to keep them working properly.

Everyone who says you have to drain the filter tower after each use doesn’t understand high pressure air filtration or needs to go back and read what Rob and Happy-Diver posted.

 

[Wallowa]

I guess I don’t know how Coltri and Rix compressors work, I’m a Bauer and Mako guy, as they are overwhelming the compressor of choice in dive shops and fire stations in the USA.

Y’all understand what the 2 chambers are on the back of the compressors are, right? The first one with the relief valve is the moisture separator, it blows down about every 15 minutes or so with auto drain, every now and again with a manual drain. This is what prevents
Because there should be no back pressure when the moisture separator is drained. After the moisture separator should be a non-return valve, and after the filter tower is a PMV. The non-return valve, with the PMV, should maintain about 1700 PSI of dry air in the filter tower, and if the non-return valve and PMV are working properly, maintain it for months.

I used to rebuild my PMVs annually to keep them working properly.

Everyone who says you have to drain the filter tower after each use doesn’t understand high pressure air filtration or needs to go back and read what Rob and Happy-Diver posted.

I thought that the PMV was a non-return, it maintained pressure regardless of loss of pressure out the whip...my MCH-6 PMV is set at 1,800psi...as for the 'must drain the filter to start the gas motor', nonsense, my MCH-6 Honda motor will start with or without the system being pressurized....again, my PMV works perfectly and is between the separator and whip....are Rix, Bauer, Mako and Poseidon great compressors, certainly, we ran a 14cfm Poseidon for years filling 40 bottles at a time, but the MCH-6 is a lightweight recreational compressor and not intended for shop or continuous filling for hours....

Why would you want the filter to remain pressurized, or for that matter any part of the system, when setting idle for any length of time? If the compressor is not running then there is no gas flow or filtration. The backpressure from the PMV is to hold the gas in filter longer for effective filtration when the compressor is running.

Again, I appreciate factual information pertaining to compressor operation and maintenance. Always willing to learn. But hyperbole is a real put off.

 

[Agro]

A gasoline engine normaly only startes with low workload. This means no pressure on the compressor, therefor you must drain the compressor and this normaly also means draining filter housings. If you have a leaking PMV (for ex. Coltri's) this will be done automatically. But this also means load change on filter housings.

If you have a centrifugal clutch you may leave the compressor under pressure while starting engine, no draining needed, no load change on filter housing. This is best solution for a gasoline driven compressor. But this only works on a PMV which does maintain pressure. Bauer PMV does, Coltri does not.

An electric driven compressor can be started under pressure, no centrifugal clutch needed.

 

[Agro]

Why would you want the filter to remain pressurized,

This was perfectly explained in this thread:
- no unnecesary load change on filter housing
- filter can start pressurized, better absorption in the first minute

 

[Agro]

my PMV works perfectly

This means it does not leak? As far as I understood your post it's leaking, filter looses pressure after a certain time.

This seems to be normal on Coltri's PMV, so the M is wrong. It's able to maintain 1'800 psi while compressor is running because leak rate is much smaller then compressor's delivery rate. But as soon as compressor stops, filter housing will be drained by P"M"V.

No your PMV does not work perfectly. It's working like any Coltri P"M"V: lousy.

 

[Agro]

my MCH-6 Honda motor will start with or without the system being pressurized..

This is possible under best circumstances, especially warm Honda and 3'000 ps only.

And as your PMV is leaking I guess you hardly ever have 3'000 psi in the system.

Bauer is selling their gasoline driven compressors with centrifugal clutch only - as far as I know. Perhaps this is only the case in cold countrys. Anyway it makes starting the engine much easier.

 

[Wallowa]

This means it does not leak? As far as I understood your post it's leaking, filter looses pressure after a certain time.

This seems to be normal on Coltri's PMV, so the M is wrong. It's able to maintain 1'800 psi while compressor is running because leak rate is much smaller then compressor's delivery rate. But as soon as compressor stops, filter housing will be drained by P"M"V.

No your PMV does not work perfectly. It's working like any Coltri P"M"V: lousy.

Not certain why you either don't understand or just ignore....but my MCH-6 PMV DOES NOT leak and maintains a minimum of 1,800psi until I open the separator/condensate drain and filter drain...no leaks, the PMV will hold 1,800psi until I drain the pressure with the drains..

No problem filling to 3,000psi...did a hot fill to 3,200psi yesterday.....yes, the MCH-6 works and works well.

As for my Honda motor not being able to start under a load [compressor pressurized] that is not true....gas motor will start with or without a load..can you spin any motor faster without a load? Of course. The Coltri GP200 Honda starts either way on first pull.

I give up....you "hate/lousy" [your terms] Coltri....not my problem...just repeating errors over and over does not make a truth...MCH-6 has been and is a good compressor.

Out Here...............

 

[Agro]

..MCH-6 has been and is a good compressor.

No way. I had 2 of them, I met 2 of them on a boat, all of them were lousy.

 

[CG43]

Load change is worst a filter housing can get

That is a fanciful claim, but what is it based on?
For comparison: pistons, cylinders, cylinder heads and valves experience approx. 2500 load changes per minute without failing immediately !!!

My Bauer Oceanus kept pressure in filterhousing for several days. Then I added a Coltri MCH6 filter including so called "PMV", now it's leaking.

If you make comparisons, please do so between comparable products. That means here between a MCH 6 and the Bauer Junior II .
Both companies do not consider it necessary to install a non-return valve after the compressor. Therefore it makes no sense that the PMV has to be able to hold the pressure for a long time. The pressure is released via the outlet valve of the last compressor stage anyway.
The MCH 6 PMV does the job it is designed to do and if you use it for something else, that's your problem.

I have a centrifugal clutch bot a non well working Coltri PMV. Bad luck.....

If you operate your Bauer Oceanus correctly, the air it delivers is so dry that a second separator no longer makes sense. So no more PMV pressure is needed for the MCH 6 separator. As for the MCH 6 filter, the Oceanus will take about 15 seconds to reach the MCH 6 PMV pressure. You can't seriously believe that the dry Oceanus air will damage the MCH 6 filter in these 15 seconds!
Bad luck........realy ?????