and would be a tremendous amount of weight that could be held to the end of the 1.71 I.D. PVC pipe, providing a 55 cubic inch chamber that would hold approximately 30 1/2 fluid ounces.ġ atmosphere (29.92 inches mercury) = 14.695948775 pounds per square inchĤ.898 psi x 2.29658 sq. The Model 625 was bench tested using a vacuum gauge and consistently held a -10 in/hg, that's more than 1/3 of an atmosphere. That figure translates into more than enough air friction or watery mechanical force to get any GOLD moving through the dredge. For the 1 1/2' dredge gauge test, the M625 HD was fitted with 24' of thin wall class 200 1 1/2 in.

Pulling the handle can more than double the mechanical force of the incoming water when compared to siphoning and improves the potential for gold recovery from cracks and crevices. With a single elongation stroke of the HG Power Plant, the M625 hand powered suction GOLD dredge is capable of producing enormous suction at the intake nozzle attributable to it's sealed chamber construction. Effortless operation makes all day GOLD hand dredging possible.Ĭlick Here M625 and M2125 GOLD Nugget YouTube Video Best of all, it's ported to effortlessly pass 1 1/2' diameter cobbles, or attach the large 3 1/2' inner diameter, 1/2' mesh seive nozzle for suctioning and pumping massive amounts of pre-classified dredge material with fine gold into a free flowing sluice or a side loading bucket. The convoluted cylinder bellows 'HG Power Plant' is reinforced from inside and out making the operation more like a 'rocking' piston pump. See: 'hydraulic mining monitor') type water pressure that's forced angularly into the dredge hose cavity. The Model 625 Hand Dredge, works much like a typical motorized recreational suction dredge, only the suction is Immediate Vacuum Response (IVR) and not dependent upon a power jet venturi and impeller produced siphoning vacuum, (vacuum that's driven by the mechanical force of gravity. Model 625 HD YouTube Description of Components Model 625 HD GOLD Prospecting Hand Dredge

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