 2020 Sun Hydraulics 1 of 2

MODEL

PPDL8

Pilot-operated, pressure reducing/relieving main stage with open transition and

integral T-8A control cavity

SERIES 1 / CAPACITY: 40 L/min. / CAVITY: T-11A

(D)MINIMUM CONTROL PRESSURE

D 100 psi (7 bar)

W 150 psi (10,5 bar)

(N)SEAL MATERIAL

N Buna-N

E EPDM

V Viton

CONFIGURATION

D Minimum Control Pressure 100 psi (7 bar)

N Seal Material Buna-N

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

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).

This valve is open in the transition from reducing to relieving which provides good pressure control and dynamic

response at the expense of higher pilot flow in the deadheaded condition.

TECHNICAL DATA

Cavity T-11A

Series 1

Capacity 40 L/min.

Maximum Operating Pressure 350 bar

Control Pilot Flow 0,40 - 0,50 L/min.

Pilot Control Cavity T-8A

Pilot Control Valve Installation Torque 27 - 33 Nm

Pilot Control Valve Hex Size 22,2 mm

Valve Hex Size 22,2 mm

Valve Installation Torque 41 - 47 Nm

Seal kit - Cartridge Buna: 990011007

Seal kit - Cartridge EPDM: 990011014

Seal kit - Cartridge Polyurethane: 990011002

Seal kit - Cartridge Viton: 990011006

Model Weight 0.10 kg.

sunhydraulics.com/model/

PPDL8

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at

point of use.

NOTES

Model Code Example: PPDL8DNCONFIGURATION OPTIONS

 2020 Sun Hydraulics 2 of 2

TECHNICAL FEATURES

Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 3000 psi (210 bar).

This valve has been optimized to work with the RBAP X**, RBAP L**, and RBAN electro-proportional pilot reliefs.

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.). The relatively

high pilot control flow is only a factor in a dead-headed condition.

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.

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.

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.

PERFORMANCE CURVES

RELATED MODELS

PPDL Pilot-operated, pressure reducing/relieving valve