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High-Flow, Very Low Pressure Drop, Bi-Directional Solenoid-Operated 
Poppet Valves

Models SV20-S38(M) normally-closed, and SV20-S39(P) normally-open bi-directional load-holding poppet-type valves can help to minimize heat generation and power loss. Both models can operate at flows up to 100 gpm/378 lpm and pressures up to 4250 psi/293 bar with a virtually flat pressure rise curve. The second-stage poppet cracks open at a minimum pressure requirement of only 5 psi/
0.34 bar, and the valve reaches full flow while creating only 25 psi/1.72 bar pressure. Because 
of the large surface area of the poppets, flow forces are used to full advantage.

The pilot valve in these new 20-size models is similar to our SF08-20 and SF08-21 valves. So the standard 08-size "D" or "E" coils can be used, with any termination style currently available.

These new valves use the new VC20-S3 cavity with the variation "A" undercut of 1.813" diameter. See our website under "Technical Ref. Info." pages 9.120.1-3. The undercut is a secondary machining operation. Port 1 is the work/tank port, and 2 is the pressure/inlet. Port 3 is typically drained to tank, or can be vented back to 1 in a custom manifold housing. Since port 3 is generally a vent, you can create a redundant lock-out option by blocking this vent port. By using the 3-Way-Short cavity, there is a bigger seat diameter available thus creating the lower pressure drop compared to the SF20-2x series valves.

Since the SF08 tube is used on the pilot valve, any manual override available on the SF08-2x series is also available for these new 20-size valves. For the normally-closed SV20-S38, the "M" style override is available, and for the normally-open, SV20-S39 the "P", "K" and "HP" type of overrides are available. The "P" option is a push button, the "K" option adds a knob, and the "HP" option adds a protective cap over the "P" option. This New "HP" cap prevents tampering as well as accidental activation.

The HydraForce high-performance standard is for pull-in current and continuous-duty operation of our solenoid valves at ±15% of nominal voltage. In order to maintain that, we are rating these valves for 4250 psi/ 293 bar and designating them as SVs, as compared to the 5000 psi/345 bar SF models.

These new poppet-type valves are well suited for load-holding applications that require low internal leakage, flow rates up to 100 gpm/378 lpm and Extremely Low pressure rise. One valve can now be used in applications that might previousy have required both a poppet logic element and a pilot solenoid valve. This is another example of HydraForce continuing to support our customers with innovations and continuous improvements in cartridge valve technology