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Innovative Hydraulic Products

Innovative Hydraulic Products

Directional valves have new plug-in coils

Parker Hannifin's Hydraulic Valve Division introduces the plug-in coil version of their D1VW series of hydraulic directional control valves (NFPA D03). The new plug-in feature allows for a quick coil replacement without the need to open a conduit box and disconnect wiring. The quick-change feature is said to reduce machine downtime. Replacing the coil takes less than a minute and does not require shutting down the machine or its hydraulic system. "It's a little like shutting down your computer," says Michael Guhdy, an engineer and product manager at Parker Hannifin's Hydraulic Valve Division. "If you have to shut your hydraulic system down, you lose certain settings and it takes time to get everything up and running again the way you want." Standard features on the valve include manual overrides. The valves' environmental protection class ratings are NEMA 4 and ISO-standard IP65, so they withstand direct water spray. The coils are available with ratings of 12 or 24V dc as well as 120 or 240V ac. The valves' maximum pressure rating is 5,000 psi and the maximum flow rating is 22 gpm. Parker Hannifin Corp., Enter 515

Aerospace valves target industrial apps

Circle Seal Controls designs and manufactures solenoid valves for the aerospace industry, which are now available for hydraulic control systems in industrial applications. The CSC valves enable bi-directional flow with zero leakage, and response times that are typically less than 100 msec, according to Scott Tomlinson, the company's marketing manager. The valves work in vacuums, but also work in hydraulic systems where pressures reach 6,000 psi. The solenoid valves are available with three-way, two-position or two-way, two-position normally closed and normally open configurations. The company's valves are made from steel, bronze, and brass. Valve seat materials are made from elastomers such as Buna and Viton, plastics, Teflon, and metals such as stainless steel and brass. The solenoids are rated for continuous duty. Operational pressure values for normally open valves are based on intermittent duty only. The CSC valves have a "direct lift/balanced poppet configuration," say Tomlinson. Direct lift valves are suitable for applications where large flow volumes are not required, but pressure rating are high-several thousand psi and greater. Most of the valves are in-line mounted and fully ported using pipe threads. Circle Seal Controls, Enter 516

Transducer measures pressure in harsh environments

The one-inch diameter KM10 transducer measures pressures from 0 to 7,500 psi in hydraulic systems subjected to the rigors of shock, vibration, and operating temperature extremes from -40 to 250F. "The applications for this product include pressure monitoring on construction machinery, off-road equipment, compressors, pumps, and other industrial equipment where stable and accurate output signals are required," says Bill Mahoney, an engineer with Ashcroft, a division of Dresser. "We have an ASIC that is programmed for a given temperature calibration." Calibration by digital signal conditioning results in an extremely linear and repeatable pressure instrument, he adds. The Ashcroft KM10 carries CE designation and features a polysilicon thin-film sensor welded to a stainless steel connection, offering protection against the effects of weather, wash-downs, and temporary immersion in water. "There are three things that everyone wants," says Mahoney. "They are better performance, smaller size, and lower cost." The KM10 is stable in the presence of RFI and EMI. Two radiometric output signals are available, as well as three electric termination wiring options. The transducer connections include NPT, SAE, and metric. Ashcroft, Enter 517

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