Sun Hydraulics PPFDOBV 减压阀-产品快照

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Sun Hydraulics PPFDOBV 减压阀

PPFDOBV - Pilot operated, pressure reducing/relieving valve with bypass orifice

Sun Hydraulics

Pilot-operated, pressure reducing/relieving valves reduce a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3). This valve incorporates a .020 (0,51 mm) in. diameter bleed orifice between the reduced pressure and tank. This biases the valve into a reducing mode in a dead headed condition which helps the valve respond to a sudden call for flow. Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 3000 psi (210 bar). Maximum pressure at port 3 should be limited to 3000 psi (210 bar). Recommended maximum inlet pressure is determined by the adjustment range. Ranges D, E, N, and Q are tested with a 2000 psi (140 bar) maximum differential between inlet and reduced pressure. Ranges A, B, and H are tested with a 3000 psi (210 bar) maximum differential between inlet and reduced pressure. Ranges C and W are tested with 5000 psi (350 bar) of inlet pressure. Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis. Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit. All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges. Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations. Cavity T-2A Series 2 Capacity 20 gpm80 L/min. Factory Pressure Settings Established at blocked control port (dead headed)blocked control port (dead headed) Maximum Operating Pressure 5000 psi350 bar Control Pilot Flow 10 - 15 in³/min.0,16 - 0,25 L/min. Adjustment - Number of Clockwise Turns to Increase Setting 55 Valve Hex Size 1 1/8 in.28,6 mm Valve Installation Torque 45 - 50 lbf ft61 - 68 Nm Adjustment Screw Internal Hex Size 5/32 in.4 mm Locknut Hex Size 9/16 in.15 mm Locknut Torque 80 - 90 lbf in.9 - 10 Nm Model Weight .60 lb0,30 kg Seal kit - Cartridge Viton: 990-202-006 Show FAQ What are the tolerances on pressure settings for Sun's pressure control valves? Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page. I need a reducer on B. Can I connect the drain to A? Yes. If you look in the sandwich section you will see that we offer many such packages. When you are pressurizing B, A is connected to tank, allowing the reducer to do its job. When you reverse, the drain or tank port of the reducer is pressurized by A. This increases the setting of the reducer and helps keep the reducer open in the reverse flow direction. What do you mean by maximum differential? Our reducing valves are outside-in valves; the supply pressure on the outside of the working parts is higher than the inside. At some pressure differential, the outside (sleeve) will close in on the piston and cause the valve to stick. A D range is adjustable from 25 to 800 psi with a maximum differential of 2000 psi. This means you could set the valve at 600 psi and expect it to work correctly with a supply pressure of 2600 psi. The valve may work at higher differentials, but we do not recommend it. The W and C ranges are tested over their entire range with an inlet pressure of 5000 psi. All direct-acting valves are tested with an inlet pressure of 5000 psi. Will your reducing/relieving valve relieve my pump to tank? No. A reducing/relieving valve throttles a supply of oil to maintain a set pressure in a secondary circuit. The valve is open until the secondary or downstream pressure rises to the setting of the valve at which time it starts to close to limit the pressure. If the secondary or downstream pressure is caused to go above the setting, the valve shifts into relieving mode and throttles the secondary circuit back to tank to prevent over-pressure. At no time can the valve connect the supply to tank. How big is a drop of hydraulic oil? There are exactly 250 Sun drops in a cubic inch or 15 in a cc. Direct acting or pilot operated - what do I use? Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust. Can I back flow through a reducing valve from port 1 to port 2? Yes. A reducing or reducing/relieving valve is normally open. If the pressure in the secondary circuit is less than the setting, it will be open.2 caveats: (1) If the valve is in the reducing mode and you suddenly reverse the flow, the valve will not have time to open and will shift into relieving mode or (2) If the back flow generates a pressure drop through the valve that exceeds the setting, the valve will shift into the relieving mode.When in doubt, use a reverse flow check. Additional Resources Sun Offers Zinc-Nickel Plating for Corrosion Resistance Sun Cartridges with EPDM Seals QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool Sun Expands Corrosion-Resistant Solutions Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses Manufacturing Sun Cartridge Cavities Reducing and Reducing/Relieving Valves Sun's Floating Style Screw-In Cartridge Units of Measure, Settings, and Conversions Sun Model Code Explanation; 999-901-334 Cavity Information (S-171) and Tooling Cartridges: Materials of Construction Fluid and Temperature Recommendations Performance Data Notes: For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel. Related Files Download Download Download

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