 2019 Sun Hydraulics 1 of 2

MODEL

PPHB8

Pilot-operated, pressure reducing/relieving main stage with integral T-8A control

cavity

SERIES 3 / CAPACITY: 160 L/min. / CAVITY: T-17A

(W)MINIMUM CONTROL PRESSURE

W 100 psi (7 bar)

D 25 psi (1,7 bar)

(N)SEAL MATERIAL

N Buna-N

E EPDM

V Viton

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).

TECHNICAL DATA

Cavity T-17A

Series 3

Capacity 160 L/min.

Maximum Operating Pressure 350 bar

Control Pilot Flow 0,25 - 0,33 L/min.

Pilot Control Cavity T-8A

Valve Hex Size 31,8 mm

Valve Installation Torque 203 - 217 Nm

Seal kit - Cartridge Buna: 990017007

Seal kit - Cartridge Polyurethane: 990017002

Seal kit - Cartridge Viton: 990017006

Model Weight 0.46 kg.

sunhydraulics.com/model/

PPHB8

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: PPHB8WNCONFIGURATION OPTIONS

 2019 Sun Hydraulics 2 of 2

TECHNICAL FEATURES

Maximum pressure at port 3 should be limited to 3000 psi (210 bar).

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.

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.

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.

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

PPHB Pilot-operated, pressure reducing/relieving valve