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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All Milton Roy drive mechanisms feature gears that are submerged in an oil bath to assure long life. Capacity can be adjusted while the pump is running or stopped, + 1.0% accuracy over a 10:1 turn-down ratio. Hydraulic By-Pass The hydraulic by-pass mechanism features a piston with a constant stroke length that pumps hydraulic fluid, thus transferring the pumping motion to a industrial diaphragm.Therefore, this type of drive can only mate with a hydrauli-cally actuated diaphragm liquid end. Capacity is varied by changing the location of a hydraulic by-pass port over the piston's path of travel. If the port is positioned at 50% of the piston's stroke length, hydraulic fluid will be relieved through the port during the first half of the piston's stroke, and pumped against the diaphragm during the remaining half.This type of drive is often called "hydraulic lost motion," because a portion of the piston's travel does not transmit pumping energy when the capacity adjustment is less than 100%. Both the mRoy and the Maxroy are hydraulic by-pass style pumps. Both develop reciprocating piston motion by way of a worm gear set and eccentric. | | | | | | | | | | mRoy A, mRoy B In the mRoy, the piston pumps manufacturer hydraulic fluid, which either forces the diaphragm to flex, or is relieved through the by-pass port. A control valve positions the port based on a desired capacity setting. The mRoy drive with its standard disc diaphragm liquid end features: • Simplex or Duplex liquid ends • Maximum capacities ranging between 0.43 GPH and 85 GPH (170 GPH Duplex) | | | | | | | | | | • Maximum pressures up to 1800 psi phragm liquid end. Fluid Fluid Fluid maxRoy B In the maxRoy, capacity is varied by positioning a stroke adjust sleeve over by-pass ports bored through the hollow piston. When operating at 100%, the ports are covered, which traps hydraulic fluid in the hydraulic pumping chamber. Once trapped, the piston's pumping action forces the hydraulic fluid to flex the diaphragm. A cup valve, which is attached to the diaphragm, closes all hydraulic paths to the diaphragm when it has reached the full forward position. This eliminates a process contour plate, as well as excessive hydraulic pressure on the diaphragm, since any excess hydraulic fluid in the hydraulic pumping chamber cannot reach the diaphragm, and is | | | | | | | | | | forced through the internal relief valve to the fluid reservoir. | | | | | | | | | | The maxRoy drive features: • Maximum flow rates between 135 GPH and 227 GPH • Maximum discharge pressures of 150 psi The maxRoy is an excellent choice for mid-range metering pump capacity at low pressure. Its design is more economical than high pressure pumps in the same capacity range, without sacrificing ruggedness and accuracy. The "straight through" process fluid path allows maxRoy to be applied to many of the same services as the HPD liquid end. | | | | | | | | | | 10 | | | | | | | | | | | | | | | | | | | | | | |
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