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SUN HYDRAULICS
PSDLLBN924


$292.90 USD

Tags:

  • SUN HYDRAULICS
  • Material:PSDLLBN924
  • Model:PSDL-LBN@924
  • Summary:Cartridge

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***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics PSDLLBN924 (Material Number: PSDLLBN924) is an electroproportional, direct-acting reducer-reliever valve designed to efficiently manage hydraulic pressure within a system. This valve specializes in reducing a high primary pressure at the inlet port 2 to a constant reduced pressure at port 1, while also offering a full flow relief function from port 1 to tank port 3. It operates by being biased to the relieving mode, and energizing the coil connects port 2 to port 1. As the current increases, so does the reduced pressure at port 1; if this exceeds the coil-induced setting, pressure is relieved to port 3. The valve's design ensures it remains open during transitions from reducing to relieving, enabling precise pressure control and dynamic response. Key specifications include a maximum operating pressure of 5000 psi (350 bar), with limitations on maximum pressure at port 3 set at 3000 psi (210 bar). The valve's direct-acting concept ensures reliable operation even in contaminated systems. Leakage is directly proportional to pressure differential and inversely proportional to viscosity, specified for conditions of supply pressure at 2000 psi (140 bar) with mid-range settings. For optimal performance, it\u2019s recommended that an amplifier with current sensing and adjustable dither between 100-250 Hz be used. The PSDLLBN924 includes optional manual control for emergency settings or boosting during power failures. It features Sun's floating style construction which minimizes binding risks due to installation torque or machining variations. The valve's physical dimensions include a solenoid tube diameter of .75 inches (19 mm) and a hex size of .78 inches (22.2 mm), with installation torque requirements between 30-35 lbf ft (41-47 Nm).

This electro-proportional, direct-acting reducer/reliever valve reduces 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). The valve is biased to the relieving mode. Energizing the coil connects port 2 to port 1. Increasing the current to the coil will proportionally increase the reduced pressure at port 1. If pressure at port 1 exceeds the setting induced by the coil, pressure at port 1 is relieved to port 3. Draining port 4 makes the valve insensitive to pressure at port 3. This valve is open in the transition from reducing to relieving which provides good pressure control and dynamic response. Optional full manual control is available.

  • Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
  • All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure.
  • Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.
  • Pressure on the drain (port 4) is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
  • Leakage specified in Technical Data is out of port 3 with a supply pressure of 2000 psi (140 bar) and the valve set at mid range. This leakage is directly proportional to pressure differential and inversely proportional to viscosity expressed in centistokes.
  • The transition from reducing to relieving is slightly open. The result is very good pressure control with oil consumption of about 0.1 gpm (0,4 L/min.).
  • For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
  • 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.
  • Uses for the 'L' manual screw adjustment include: emergency valve setting during power failure or alternatively boosting the valve setting
  • With the 'L' adjustment screw, all ranges are factory set at zero (adjustment screw fully backed out). With the coil de-energized, clockwise adjustment of the screw will increase the spring bias load up to the maximum setting for that range. With the coil energized, any mechanical pressure setting is directly additive to the coil induced value.
  • By controlling the pressure at the drain (port 4), the effective setting of the valve can be increased over the nominal valve setting.
  • 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.

CavityT-21A
Series1
Capacity5 gpm20 L/min.
Maximum Operating Pressure5000 psi350 bar
Maximum Valve Leakage at 110 SUS (24 cSt)20 in³/min.330 cc/min.
Adjustment - Number of Clockwise Turns to Increase Setting55
Solenoid Tube Diameter.75 in.19 mm
Valve Hex Size7/8 in.22,2 mm
Valve Installation Torque30 - 35 lbf ft41 - 47 Nm
Adjustment Screw Internal Hex Size5/32 in.4 mm
Locknut Hex Size9/16 in.15 mm
Locknut Torque80 - 90 lbf in.9 - 10 Nm
Model Weight (with coil)1.20 lb0,55 kg
Seal kit - CartridgeViton: 990-021-006
Seal and nut kit - CoilViton: 990-770-006Viton: 990-770-006

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Notes:
  • Please verify cartridge clearance requirements when choosing a Sun manifold. Different valve controls and coils require different clearances.