SUN HYDRAULICS
RELIEF VALVE
PPHF8WN
$264.70
- SUN HYDRAULICS
- Material:PPHF8WN
- Model:PPHF-8WN
- Summary:Cartridge
Quantity in stock: 7
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).
- These valves have the main stage orifice drilled into the piston rather than a staked-in orifice. This allows the valve to survive physically demanding applications.
- 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).
- 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.
- 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.
- 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.
- 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-17A |
Series | 3 |
Capacity | 40 gpm160 L/min. |
Maximum Operating Pressure | 5000 psi350 bar |
Control Pilot Flow | 15 - 20 in³/min.0,25 - 0,33 L/min. |
Pilot Control Cavity | T-8AT-8A |
Pilot Control Valve Installation Torque | 20 - 25 lbf ft27 - 33 Nm |
Pilot Control Valve Hex Size | 7/8 in.22,2 mm |
Valve Hex Size | 1 1/4 in.31,8 mm |
Valve Installation Torque | 150 - 160 lbf ft203 - 217 Nm |
Model Weight | 1.30 lb0,60 kg |
Seal kit - Cartridge | Viton: 990-017-006 |
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- Fluid and Temperature Recommendations
- Sun Model Code Explanation; 999-901-334
- Performance Data
- Cartridges: Materials of Construction
- Units of Measure, Settings, and Conversions
- Electro-Proportional Terms and Definitions
- Cavity Information (S-171) and Tooling
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.