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SUN HYDRAULICS
PPDB8WN


$90.20

Tags:

  • SUN HYDRAULICS
  • Material:PPDB8WN
  • Model:PPDB-8WN
  • Summary:Cartridge

Quantity in stock: 0

***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 PPDB8WN (Material Number: PPDB8WN) is a 3-way, normally open modulating valve designed to reduce high primary pressure at inlet port 2 to a constant reduced pressure at port 1, while providing full flow relief from port 1 to tank port 3. This valve integrates an integral pilot control cavity compatible with any T8A pressure control cartridge, allowing for versatile pilot control options such as electroproportional, solenoid, air pilot, and hydraulic pilot operation. The setting of the pilot cartridge determines the pressure difference between reduced pressure port 1 and tank port 3. It is important to note that pressure at port 3 should not exceed 3000 psi (210 bar) as it directly adds to the valve setting in a 1:1 ratio. The maximum inlet pressure is defined by the bias spring used; the D spring is tested with a maximum differential of 2000 psi (140 bar), while the W spring handles up to 5000 psi (350 bar). The valve's design includes Sun\u2019s floating style construction which minimizes potential binding of internal parts due to excessive installation torque or machining variations. For installation, it\u2019s crucial first to secure the main stage valve before attaching the T8A pilot control valve. This valve supports systems using phosphate ester fluids when configured with EPDM seals but should not be exposed to petroleum-based fluids or greases. Additionally, if reverse free flow from reduced pressure port 1 back to inlet port 2 is needed, a separate check valve may be required as full reverse flow might close the main spool. The PPDB8WN exhibits low deadband transition between reducing and relieving modes and offers stable performance with low hysteresis due to its exceptionally flat pressure-flow characteristics.

This valve is a 3-way, normally open modulating element that incorporates an integral pilot control cavity. The pilot control cavity will accept any T-8A pressure control cartridge. The 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 pilot cartridge's setting determines the difference in pressure between reduced pressure (port 1) and the tank (port 3).

  • 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 inlet pressure is determined by the bias spring. The D spring is tested with 2000 psi (140 bar) maximum differential pressure and the W spring is tested with 5000 psi (350 bar) maximum inlet pressure.
  • NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
  • The -8 control option allows the pilot control valve to be incorporated directly into the end of the relief cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
  • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
  • 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.
  • Pilot operated valves exhibit very low dead-band transition between reducing and relieving modes.
  • Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis.
  • 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.

CavityT-11A
Series1
Capacity10 gpm40 L/min.
Maximum Operating Pressure5000 psi350 bar
Control Pilot Flow7 - 10 in³/min.0,11 - 0,16 L/min.
Pilot Control CavityT-8AT-8A
Pilot Control Valve Installation Torque20 - 25 lbf ft27 - 33 Nm
Pilot Control Valve Hex Size7/8 in.22,2 mm
Valve Hex Size7/8 in.22,2 mm
Valve Installation Torque30 - 35 lbf ft41 - 47 Nm
Model Weight.30 lb0,15 kg
Seal kit - CartridgeViton: 990-011-006

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Notes:
  • Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.