My Rix SA-6 Diesel

[rjack321]

I have a check valve before the tower and a PMV after it. I am sure I am not the only one as it ensures that the tower remains pressurized.

The gold bits before the tower look like low volume PMVs to me. I have one that I use when I take my compressor on the road.
back-pressure-regulator-1-to-10-cfm (scubacompressor.com)

You can use a PMV as a check valve but its not really ideal.

 

[rob.mwpropane]

I believe you're correct about the one on the compressor. The other one on the tower is just a check valve; they both look a lot alike.

Check Valve 6,000 PSI - August Industries Inc.

 

[grf88]

The gold bits before the tower look like low volume PMVs to me. I have one that I use when I take my compressor on the road.
back-pressure-regulator-1-to-10-cfm (scubacompressor.com)

You can use a PMV as a check valve but its not really ideal.

That looks a lot like my check valve:
Check Valve 6,000 PSI - August Industries Inc.

 

[rob.mwpropane]

That looks a lot like my check valve:
Check Valve 6,000 PSI - August Industries Inc.

I'm 90% sure someone on here verified the one installed at the compressor was in fact a PMV and not a check valve. I can't find the picture of the model on the side.

Edit: found it:

 

[-JD-]

Wouldn't using a PMV as a check valve at the compressor outlet be advantageous as it allows the compressor to be operated without the filter tower?

Also, as I understand it from earlier in the thread, minimizing the time the floating 3rd stage is not properly loaded is important, right? Without a PMV at the compressor outlet, the significantly larger filter volume would add to the unloaded time, significantly more than just that caused by the separator.

Of course, I could very possibly be misinterpreting/misremembering the scattered mass of information earlier in the thread ...

 

[rob.mwpropane]

Wouldn't using a PMV as a check valve at the compressor outlet be advantageous as it allows the compressor to be operated without the filter tower?

Also, as I understand it from earlier in the thread, minimizing the time the floating 3rd stage is not properly loaded is important, right? Without a PMV at the compressor outlet, the significantly larger filter volume would add to the unloaded time, significantly more than just that caused by the separator.

Of course, I could very possibly be misinterpreting/misremembering the scattered mass of information earlier in the thread ...

That's the way I understand / interpreted it....but that doesn't mean much.

Going back through the thread it was @rjack321 that verified the picture was a PMV and not just a check valve.

 

[grf88]

Wouldn't using a PMV as a check valve at the compressor outlet be advantageous as it allows the compressor to be operated without the filter tower?

Also, as I understand it from earlier in the thread, minimizing the time the floating 3rd stage is not properly loaded is important, right? Without a PMV at the compressor outlet, the significantly larger filter volume would add to the unloaded time, significantly more than just that caused by the separator.

Of course, I could very possibly be misinterpreting/misremembering the scattered mass of information earlier in the thread ...

Without a filter tower installed you are correct that the PMV on the compressor has great value. If there is a check valve before the filter it does not add as much value as the filter tower remains pressurized and serves the same purpose.

 

[rhwestfall]

I have a check valve before the tower and a PMV after it. I am sure I am not the only one as it ensures that the tower remains pressurized.

Same here. In fact my setup is like this (I'm not saying it's correct; it just seems to make sense to my uneducated self):
Compressor -->check valve--> moisture separator -->check valve-->MS only tower-->check valve-->main filter tower-->PMV

I wanted a setup that maintained most of the pressure in the system while I drain the separator. Also, I can open the separator petcock and let the compressor run unloaded during startup and shutdown.

similar...

Compressor -> OEM Separator w/ manual drain -> OEM AC only filter (repurposed to 13x MS) with manual drain* -> Moisture monitor -> check valve -> manual drain -> filter (AC, Hop,13x) -> hyper filters -> PMV -> fill whip/CO Monitor.

* - This is where the old compressor fill whip was attached.

 

[rhwestfall]

I'm 90% sure someone on here verified the one installed at the compressor was in fact a PMV and not a check valve. I can't find the picture of the model on the side.

Edit: found it:
View attachment 657153

Mine that looks exactly like that is (as I was told) a rebuildable check valve not a PMV...

 

[rob.mwpropane]

Mine that looks exactly like that is (as I was told) a rebuildable check valve not a PMV...

Does your have the same #'s? I tried looking them up but I get nowhere.