Country of Origin: United States
Tried these in the past and had no luck. I found one so I thought I would give it another chance. Recovered the R134a, pulled out the tube, put the VOV in, vacuumed and recharged my Jeep with 1.25 lbs of R134a.
High side 325psi.
Low side 70 psi.
Vent temp 80.
Sucked it out and went back to an Orange tube. High side 250, low 30 and 42 vent temp. Dunno how many times I/we have told people to stay away from the VOV.........They still don't work.
I tend to agree. But trillions have been sold or was it billions.
Texas Instruments purchased the right, thinking their engineers could solve the problems, gave up. Maybe good in principle, maybe not, trying to control low side pressures based on inlet pressure only. TXV works fine, but controlling pressures based on evaporator temperatures. Variable displacement compressors even worked better.
From what little I know about it, if you want a fixed output, either pressure or voltage, you gotta have a reference with some type of servo circuit to adjust to that reference. And pattens today no longer require that you file for a patent with a working prototype. All based on legal claims to an invention. Japanese and others flooded the US patent office with non-working devices based on unproven theory. Than trying to sue everyone for infringing these claims.
A patten was issued on a automatic setpoint adjusting voltage regulator, damn thing couldn't work in a million years, the holders try to sue us for infringing on their claims. I had to write a one page summary, so idiots could understand why their patten didn't work and why we were not infringing on their claims. They were suing us. We have to manually trim our reference and design it so it maintains that reference over the entire temperature range. Where in the hell is your reference.
See the same thing with this VOV, trying to hold about 30 psi with no controls to and something to compare that pressure to a given reference. Just a bunch of BS, God this world is loaded with BS.
POA valve had a mechanical regulator as a reference for the TXV that controlled the pressure into the evaporator, that worked well with a bypass for the compressor so it could run continuously. But was considered too expensive. Then that stupid CCOT system was developed to cycle the compressor on and off continuously expecting it to accelerate form 0 to engine rpm in a split second. Worked for awhile, but then constant problems for the consumer, saved us few cents with thousands in repair cost.
Even a system with a good sound principle doesn't work worth worth a damn unless its made with good materials. Spend a huge fortune for a new vehicle, and watch it rust or corrode away at a faster rate than you can make payments on the damn thing. Worse is leaks, EPA has no say in this, corporate controlled, never fined or push a recall on manufacturers. But you as a consumer or a tech will get a huge fine if caught releasing a gram of refrigerant.
Calling the house of representatives is really a huge joke, last thing they do is to represent the people that elected them. Just play a huge roll in screwing the American public.
there MAY be some usuage for the VOV but very limited. I think I read thatthe VOV works well for slow rpm vehicles as mail delivery when you go house to house at 5 to 10 MPH. Other than that, a waste.
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