Created on 09/29/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
SQFB
Kick-down, pilot operated, balanced piston sequence valve
SERIES 2 / CAPACITY: 120 L/min. / CAVITY: T-2A
Kick-down sequence valves will kick completely open and remain open once the pressure at the inlet (port 1)
exceeds the valve setting, creating an unrestricted flow path from port 1 to port 2 (sequence). The pressure setting
at port 1 is relative to the drain (port 3). The valve remains open as long as the pressure at port 1 exceeds the
pressure at port 2. To reset the valve, pressure at port 1 must fall below the setting of 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) 50 cc/min.
Adjustment - Number of Clockwise Turns to Increase Setting 5
Locknut Hex Size 15 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-202-007
Seal kit - Cartridge Polyurethane: 990-002-002
Seal kit - Cartridge Viton: 990-202-006
(L)CONTROL
L Standard Screw Adjustment
C Tamper Resistant - Factory Set
K Handknob
O Handknob with Panel Mount
(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/
SQFB
TECHNICAL FEATURES
For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.
NOTES
Model Code Example: SQFBLANCONFIGURATION OPTIONS
Created on 09/29/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
All 3 port sequence cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size).
Should not be used in load holding applications.
The main stage orifice is protected by a 150 micron stainless steel screen.
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
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.
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
