[C'Ya]

Another possible low cost & maintenance idea I was thinking is use an aspirator design using butane as the driving liquid using a pump for pressure but unsure of CFM rating on aspirators but could add multiple for more CFM depending on pressure output of pump

[Gray Wolf]

Originally Posted by C'Ya

Icog may be better to request inf on CARE 40 (R290) which is propane or r600a both used as refrigerants
C.

Elaborate?

[Gray Wolf]

Originally Posted by C'Ya

Another possible low cost & maintenance idea I was thinking is use an aspirator design using butane as the driving liquid using a pump for pressure but unsure of CFM rating on aspirators but could add multiple for more CFM depending on pressure output of pump

Ummmm, certainly outside the box, considering the flow rates of 2.5 gallons per minute required by the average faucet aspirator and the need for no back pressure on the discharge side to operate.

[C'Ya]

Originally Posted by Gray Wolf

Elaborate?

Well GW if manufacturers are avoiding butane extraction for legal purposes requesting info one pumps using refrigerants in the same family as butane(R600), like CARE 40 (R290) which is propane or R600a which is isobutane may get by the legal dept. and get better attention

[C'Ya]

R-1234yf is another good refrigerant choice since it's being used by Mercedes to replace R-134a and is hc blended refrigerant

[wantaknow]

would a auto a/c vac pump work ?

[C'Ya]

Originally Posted by wantaknow

would a auto a/c vac pump work ?

they are normally oil lubricated compressors

[C'Ya]

Originally Posted by Gray Wolf

Ummmm, certainly outside the box, considering the flow rates of 2.5 gallons per minute required by the average faucet aspirator and the need for no back pressure on the discharge side to operate.

was reading wiki about aspirator pump and it stated,
"If a liquid is used as the working fluid, the strength of the vacuum produced is limited by the vapor pressure of the liquid (for water, 3.2 kPa or 0.46 psi or 32 mbar at 25 °C or 77 °F). If a gas is used, however, this restriction does not exist"
made me start thinking about butane's vapor pressure ~25 PSI (at 50 °F) and I assumed this increase aspirator's effect if I'm understanding the wiki correctly

https://en.wikipedia.org/wiki/Aspirator_(pump)

I apologize if link is out of bounds and have no issue with its removal

[Gray Wolf]

Originally Posted by C'Ya

Well GW if manufacturers are avoiding butane extraction for legal purposes requesting info one pumps using refrigerants in the same family as butane(R600), like CARE 40 (R290) which is propane or R600a which is isobutane may get by the legal dept. and get better attention

It is the flammable class of refrigerants that they are avoiding.

[couchlockd]

ill tell ya, ive used ritchie and yellow jacket in hvac recovery pumps for years, very good and affordable.