Efficient new pilot-operated servo proportional valves from Parker Hannifin are based on the company’s direct operated DFplus hydraulics control valve. The new D*1FP series also incorporate Parker’s Voice Coil Drive (VCD) technology, which has already improved the performance and productivity of hydraulic systems used in machinery.
Voice Coil Drive is based on the same principle used to vibrate the diaphragms of loudspeakers — Parker says it is the first full range manufacturer to succeed in using this technique to control the high forces within hydraulic valves. By producing dynamics on a par with modern servo valves, the VCD technology results in a much simpler valve structure.
The new pilot-operated D*1FP series has now transferred the advantages of the VCD to larger frame sizes and higher flow rate valves. High dynamics and precision of each new pilot valve delivers optimum control of the main spool, resulting in servo class performance from the complete valve.
Saving installation and set-up time
In addition to the benefits offered by the high dynamics, the control behaviour of the valves ensures high stability in operation and easy, time-saving installation and set-up — all essential elements in creating hydraulic systems that can help deliver to manufacturers reduced cycle times, improved product quality and minimum scrap rates. Whether in the direct or pilot-operated valves, the VCD technology is said to offer the same benefits of robust design and long life times.
A new safety concept with the pilot valve can also reduce the need for additional shut-off valves in hydraulics systems. It works via a safe fourth position of the D1FP pilot valve to ensure that the main stage is hydraulically balanced at power down and the main spool is in a safe position.
D*1FP valves are available in the four sizes: NG10 (CETOP05), NG16 (CETOP07), NG25 (CETOP08) and NG32 (CETOP10). With flow rates of up to 3000litres/min, the valves bring the advantages of Voice Coil Drive technology to almost any size of hydraulics system.
