1 before the pump test, before adding in the tank clean machine oil or vegetable oil, move the seed oil press handle up and down pressure, to see whether the press piston rises. If the piston does not rise or handle pressure effortlessly move in when the tank to check the valves, and the exclusion of air from the lines.
(2) carry out the whole pressure test, pressure test used was 1.25 times the working pressure, check the piston out to the maximum working stroke, the regulator 15 minutes, the pressure gauge reading should not exceed 4% decline in the value of the test pressure; All the oil should be no leakage; after all the pressure drop, pressure gauge pointer back to "0" bits, parts should be no damage, trolley may not have significant deformation, moving parts, no wiring.
3 reliability test of the oil equipment safety valve, the valve operating pressure adjusted (+5 upper left, lower left +1) MPa, five successive trials, the needle valve opening and closing sensitive valve pressure gauge after each jump should not below the rated working pressure.