Created on 06/21/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
RPKE
Fast-acting, pilot operated, balanced piston relief valve
SERIES 4 / CAPACITY: 760 L/min. / CAVITY: T-18A
Fast-acting, pilot-operated, balanced piston relief cartridges are normally closed, pressure-limiting valves used to
protect hydraulics components from pressure transients. Fast opening and closing is gained at the expense of
smoothness. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port
2), throttling flow to limit the pressure rise. These valves have low pressure rise vs. flow and are very fast.
TECHNICAL DATA
Factory Pressure Settings Established at 15 L/min.
Maximum Operating Pressure 350 bar
Response Time - Typical 2 ms
Maximum Valve Leakage at 110 SUS (24 cSt) 80 cc/min.@70 bar
Adjustment - Number of Clockwise Turns to Increase Setting 5
Locknut Hex Size 15 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-018-007
Seal kit - Cartridge Polyurethane: 990-018-002
Seal kit - Cartridge Viton: 990-018-006
(L)CONTROL
L Standard Screw Adjustment
C Tamper Resistant - Factory Set
K Handknob
(A)ADJUSTMENT RANGE
A 100 - 3000 psi (7 - 210 bar), 1000 psi (70
bar) Standard Setting
B 50 - 1500 psi (3,5 - 105 bar), 1000 psi (70
bar) Standard Setting
C 150 - 6000 psi (10,5 - 420 bar), 1000 psi
(70 bar) Standard Setting
D 25 - 800 psi (1,7 - 55 bar), 400 psi (28
bar) Standard Setting
E 25 - 400 psi (1,7 - 28 bar), 200 psi (14
bar) Standard Setting
W 150 - 4500 psi (10,5 - 315 bar), 1000 psi
(70 bar) Standard Setting
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/
RPKE
TECHNICAL FEATURES
Model Code Example: RPKELANCONFIGURATION OPTIONS
Created on 06/21/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
Will accept maximum pressure at port 2; suitable for use in cross port relief circuits. If used in cross port relief circuits, consider spool leakage.
Main stage orifice is protected by a 150 micron stainless steel screen.
Not suitable for use in load holding applications due to spool leakage.
Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
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
