the government required OPD valves to prevent cylinders from being overfilled. yes many companies were overfilling 20lb cylinders and causing accidents. the OPD valve is just a simple float on the valve which shuts off the gas when it reaches the 80% level. the law required that the valve could not allow over 80% in the tank by volume, but most tanks are filled by weight because propane expands and contracts with the temperature. the OPD valve would shut off at 80%, but when the propane was hot,80 degrees and above, there would only be 19.5 lbs of propane in the cylinder. some consumer group found this out and sued the large cylinder refillers for cheating the public. you cannot put 19.5lbs in a cylinder and call it 20lbs and you cannot fill it over 80%. the answer was these tanks are now called simply gas grill cylinders and as long as the weight of the propane in the tank is at least as much as is stated on the label or cylinder cabinet and not filled over 80% everthing is legal. 15lbs is the norm for the big refillers. the cylinder can be over 12years old if it has had a new valve installed and has been recertified. most states require you to be licenced to do the recertification. yes your mom and pop stores can still fill your cylinder with 19.5 or 20lbs. help keep them in business. government regulation is forcing more and more propane dealers to sell out to the big major companies every year.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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