Tools of the Trade
February 2002
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Vane pumps
Fixed displacement vane pumps from Denison Hydraulics are suited for use on such equipment as fork lifts, scissor lifts, utility trucks, machine tool power units, filter carts, compactors, and bailers. The SDV10 and SDV20 are single pumps, while the SVD2010 and SDV2020 are double pumps. Depending on the ring size used, the displacements for these models range from 3.3 to 42.44 cm3/rev (0.2 to 2.59 in3/rev). The new pumps are directly interchangeable with many similar existing competitive units.
Directional control valves
The Duplomatic DS5 series directional control valve from Universal Hydraulics International Ltd. is a high-performance, five-chamber, NFPA Standard D05 unit. It offers operating pressure to 31,716 kPa (4600 psi) with flow capacity to 151 L/min (40 gal/min), allowing the replacement of pilot-operated D05 valves with a more efficient direct operating unit.
Noncontact level sensors
The UCL-Series continuous, noncontact, ultrasonic level transmitters from Gems Sensors are designed for fluids such as oils and petroleum distillates that coat or corrode common, immersed sensors. Accurate to ±0.25% of span, these solid-state sensors feature 4-20 mA output, -40 to +60°C (-40 to +140°F) operating temperature, and maximum operating pressure of 207 kPa (30 psi) at 25°C (77°F).
Pump controller
Goulds Pumps, an ITT Industries Co., has added the Model PS100 to its PumpSmart Control Solutions products. The controller is a microprocessor-based, variable-speed drive programmed specifically for centrifugal pumps. The drive is designed not only for single-pump systems, but it also has onboard multi-pump logic for two- to four-pump systems. It provides pump protection by continually monitoring and reacting to both system and pump conditions and matches pump output to the exact system head required by the process. The unit maximizes pump reliability, minimizes maintenance costs, and eliminates the need for starter panels, relays, switches, control valves, and recirculation piping.
Floatless sensors
SEF (shaped electromagnetic field) technology from MTS is a continuous level-sensing technology. As an alternative to resistive float and arm devices, SEF-based sensors offer floatless operation, absolute measurement, and a smaller size. SEF can be shaped to linearize the volume output as the level rises in tanks with nonuniform, irregular cross-sectional areas. They can also be shaped to fit serpentine paths. This patent-pending technology is intended for designers of marine, agricultural, and recreational fluid systems (oil, fuel, coolants, and water). The sensors are designed for specific solutions only in high volume applications.
