Created on 06/12/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
RQCB
Kick-down, pilot operated, balanced piston relief valve
CAPACITY: 45 L/min. / CAVITY: T-162A
Kick-down relief cartridges act similar to a circuit breaker in an electrical system. The valves will kick completely
open and remain open once the pressure at the inlet (port 1) exceeds the valve settting, creating an unrestricted
flow path from port 1 to tank (port 2). The valve remains open as long as the pressure at port 1 exceeds the
pressure at port 2. To reset the valve, flow from port 1 to port 2 must cease and pressure at port 2 must be equal
to or greater than the pressure at port 1.
TECHNICAL DATA
Factory Pressure Settings Established at Kick down point
Maximum Operating Pressure 350 bar
Response Time - Typical 25 ms
Maximum Valve Leakage at 110 SUS (24 cSt) 30 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: 990-162-007
Seal kit - Cartridge Polyurethane: 990-162-002
Seal kit - Cartridge Viton: 990-162-006
(L)CONTROL
L Standard Screw Adjustment
C Tamper Resistant - Factory Set
K Handknob
(A)ADJUSTMENT RANGE
A 75 - 3000 psi (5 - 210 bar), 1000 psi (70
bar) Standard Setting
B 75 - 1500 psi (5 - 105 bar), 1000 psi (70
bar) Standard Setting
C 75 - 6000 psi (5 - 420 bar), 1000 psi (70
bar) Standard Setting
N 75 - 800 psi (5 - 55 bar), 400 psi (28 bar)
Standard Setting
Q 75 - 400 psi (5 - 28 bar), 200 psi (14 bar)
Standard Setting
W 75 - 4500 psi (5 - 315 bar), 1000 psi (70
bar) Standard Setting
(N)SEAL MATERIAL
N Buna-N
V Viton
snhy.com/
RQCB
TECHNICAL FEATURES
Do not use in load holding applications.
NOTES
Model Code Example: RQCBLANCONFIGURATION OPTIONS
Created on 06/12/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
TECHNICAL FEATURES
To reset valve, flow through the cartridge must cease.
Main stage orifice is protected by a 150 micron stainless steel screen.
Not suitable for use in load holding applications.
Intended for use on the actuator side of the system as flow through the valve must cease for the valve to reset. If used on the pump side of a system, pump flow
must be shut off for the valve to reset.
Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
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