Created on 07/29/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
FSAS
High accuracy synchronizing, flow divider-combiner valve
SERIES 1 / CAPACITY: 1 - 6 L/min. / CAVITY: T-31A
High accuracy, synchronizing flow divider/combiners are sliding-spool, pressure-compensated devices used to split
flow in one direction and combine flow in the opposite direction. With a sychronizing feature, these valves can be
used to allow two hydraulic cylinders to fully stroke and synchronize at the end of the stroke. When the first cylinder
has reached the end of its stroke, a pressure-compensated, reduced flow is metered to or from the second cylinder
until it also reaches the end of its stroke.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Divisional Accuracy at Minimum Input Flow 50% ±3.5%
Divisional Accuracy at Max Input Flow 50% ±2.0%
Pressure Drop at Minimum Rated Input Flow 2 bar
Pressure Drop at Maximum Rated Input Flow 24 bar
Seal kit - Cartridge Buna: 990-031-007
Seal kit - Cartridge Polyurethane: 990-031-002
Seal kit - Cartridge Viton: 990-031-006
(X)CONTROL
X Not Adjustable
(A)FLOW SPLIT
A 50/50
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/FSAS
TECHNICAL FEATURES
All flow divider and divider/combiner cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size).
Operating characteristics cause the leg of the circuit with the greatest load to receive the higher percentage of flow in dividing mode. If a rigid mechanism is used to
tie actuators together, the lead actuator may pull the lagging actuator and cause it to cavitate.
In applications involving rigid mechanisms between multiple actuators, operating inaccuracy will cause the eventual lock-up of the system. If the mechanical structure
is not designed to allow for the operating inaccuracy inherent in the valve, damage may occur.
In motor circuits, rigid frames or mechanisms that tie motors together, and/or complete mechanical synchronized motion of the output shaft of the motors, either by
wheels to the pavement or sprockets to conveyors, will contribute to cavitation, lock-up and/or pressure intensification.
Variations in speed and lock-up can be attributed to differences in motor displacement, motor leakage, wheel diameter variance and friction of wheels on the driving
surface.
Extreme pressure intensification can occur on multiple wheel drive vehicles.
The synchronization feature provides bi-directional static error correction.
Synchronization flow is approximately 15% of minimum rated input flow.
Differential slip for tractive drive systems must be achieved with orifices in the body/manifold.
Divisional and combining accuracy are equal.
Model Code Example: FSASXANCONFIGURATION OPTIONS
Created on 07/29/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
The synchronizing feature only comes into play when any one of the 3 ports is blocked. At that time, flow may occur between the other two ports.
Below the minimum flow rating there is not enough flow for the valve to modulate. It is effectively a tee. If flow starts at zero and rises, there will be no dividing or
combining control until the flow reaches the minimum rating.
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
