Catalog HY15-3502/US
Direct Acting Relief Valve
Series RDH081
PC9
Check
Valves
Shuttle
Valves
Load/Motor
Controls
Flow
Controls
Pressure
Controls
Logic
Elements
Directional
Controls
Manual
Valves
Solenoid
Valves
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Valves
Coils &
Electronics
Bodies &
Cavities
Technical
Data
SH
CV
LM
FC
PC
LE
DC
MV
SV
PV
CE
BC
TD
Parker Hannifin Corporation
Hydraulic Cartridge Systems
Technical Information
Specifications
Rated Flow 1.9 LPM (.5 GPM)
Maximum Inlet 380 Bar (5500 PSI)
Pressure
Maximum 350 Bar (5000 PSI)
Pressure Setting
Reseat Pressure 90% of crack pressure
Leakage at 5 drops/min. (.33 cc/min.)
150 SSU (32 cSt) @75% of crack pressure
Cartridge Material All parts steel. All operating
parts hardened steel.
Operating Temp. -45°C to +93.3°C (“D”-Ring)
Range/Seals (-50°F to +200°F)
-31.7°C to +121.1°C (Fluorocarbon)
(-25°F to +250°F)
Fluid Mineral-based or synthetic with
Compatibility/ lubricating properties at viscosities
Viscosity of 45 to 2000 SSU (6 to 420 cSt)
Filtration ISO Code 16/13,
SAE Class 4 or better
Approx. Weight .09 kg (.20 lbs.)
Cavity C08-2
(See BC Section for more details)
Form Tool Rougher None
Finisher NFT08-2F
Performance Curve
Flow vs. Inlet Pressure
(Pressure rise through cartridge only)
(2)
(1)
Flow (Q)
1.1
.3
.38
.1
.76
.2
LPM
GPM
0
1.5
.4
1.9
.5
Hydraulic Oil 150 SSU @ 100°F (32 cSt)
0
1000
2000
345
414
207
276
69
138
Pressure, PSI
5000
6000
PSI Bar
3000
4000
General Description
Direct Acting Relief Valve. This valve
is designed for pilot flow circuits. For
additional information see Technical
Tips on pages PC1-PC6.
Features
•
Hardened, precision ground parts for durability
•
Low profile adapter for minimal space requirements
•
Fully guided pilot for more consistent reseat
•
Steel adapters are coated with yellow zinc dichromate for
protection from salt spray
•
Polyurethane “D”-Ring eliminates backup rings and
prevents hydrolysis
(1)
(2)
Direct Acting Relief Valve
Series RDH081
Catalog HY15-3502/US
PC10
Check
Valves
Shuttle
Valves
Load/Motor
Controls
Flow
Controls
Pressure
Controls
Logic
Elements
Directional
Controls
Manual
Valves
Proportional
Valves
Coils &
Electronics
Technical
Data
SH
CV
LM
FC
PC
LE
DC
MV
SV
PV
CE
BC
TD
Bodies &
Cavities
Solenoid
Valves
Parker Hannifin Corporation
Hydraulic Cartridge Systems
Technical Information
Dimensions
Millimeters (Inches)
Ordering Information
THIRD-ANGLE
PROJECTION
Fixed Cap/Tamper Resistant Version
42.4
(1.67)
44.7
(1.76)
27.2
(1.07)
12.6
(.50)
(1)
(2)
7/8" Hex.
Installation
Torque - See
Technical Notes
(1)
(2)
Screw/Knob Version
25.4 (1.0)
Dia. Knob
36.6
(1.44)
36.6
(1.44)
3/4-16 UNF-2A
Thread
SealsPressure
Range
Adjustment
Style
Body
Material
Port
Size
Optional
Pressure
Setting
Code Body Material
Omit Steel
A Aluminum
Code Adjustment Style / Kit No.
F Fixed style, preset at factory.
K Knob Adjust (717784-10)
S Screw Adjust
T Tamper Resistant Cap (717943)
RDH081
08 Size
Direct Acting
Relief Valve
* Add “A” for aluminum, omit for steel.
Code Port Size Body Part No.
Omit Cartridge Only
6P 3/8″ NPTF (B08-2-*6P)
4T SAE-4 (B08-2-*4T)
6T SAE-6 (B08-2-*6T)
6B 3/8″ BSPG (B08-2-*6B)
Code Seals / Kit No.
Omit “D”-Ring / (SK08-2)
N Nitrile / (SK08-2N)
V Fluorocarbon / (SK08-2V)
Code Pressure Range
10 6.9 - 69 Bar (100 - 1000 PSI)
Standard Setting:
34.5 Bar (500 PSI) @ crack pressure,
approximately 100 cc/min (6.1 in
3
/min)
20 6.9 - 138 Bar (100 - 2000 PSI)
Standard Setting:
69 Bar (1000 PSI) @ crack pressure,
approximately 100 cc/min (6.1 in
3
/min)
30 13.8 - 207 Bar (200 - 3000 PSI)
Standard Setting:
103.5 Bar (1500 PSI) @ crack pressure,
approximately 100 cc/min (6.1 in
3
/min)
50 13.8 - 345 Bar (200 - 5000 PSI)
Standard Setting:
172.4 Bar (2500 PSI) @ crack pressure,
approximately 100 cc/min (6.1 in
3
/min)
Optional Pressure Setting
Pressure ÷ 10
i.e. 235 = 2350 PSI
(Omit if standard setting is used)
Setting Range:
100 to 5000 PSI
All settings at crack pressure,
approximately 100 cc/min (6.1 in
3
/min)
