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2018 Sun Hydraulics Corporation 1 of 8
MODEL
XRFC
Hot oil shuttle and relief assembly
CAPACITY: 80 L/min.
This valve assembly provides a flushing circuit for hydrostatic transmissions. The hot oil flushing circuit allows a
discharge of oil from the low pressure side of the loop. The charge pump replaces the hot, dirty oil with cool, filtered
oil. The hot oil discharge is often passed through the cases of the pump and the motor, flushing hot, dirty oil from
them as well.
snhy.com/
XRFC
TECHNICAL DATA
Body Type Line mount
Capacity 80 L/min.
Mounting Hole Quantity 2
Model Weight 2.15 kg.
Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port
type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port
type/size specified.
NOTES
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MODEL
XRFC
Hot oil shuttle and relief assembly
CAPACITY: 80 L/min.
Continued from
previous page
(L)CONTROL
L Standard Screw Adjustment
C Tamper Resistant - Factory Set
K Handknob
O Handknob with Panel Mount
W Hex Wrench Adjustment
Y Tri-Grip Handknob
(A)ADJUSTMENT RANGE
A 100 - 3000 psi (7 - 210 bar), 1000 psi (70 bar)
Standard Setting
W 150 - 4500 psi (10,5 - 315 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
N 60 - 800 psi (4 - 55 bar), 400 psi (28 bar) Standard
Setting
Q 60 - 400 psi (4 - 28 bar), 200 psi (14 bar) Standard
Setting
(N)SEAL MATERIAL
N Buna-N
E EPDM
V Viton
(A)
(M)
OPTION SELECTION EXAMPLE: XRFCLANAM
PRIMARY CARTRIDGE
A A (with RPEC primary cartridge, Pilot operated, balanced piston relief valve)
A A (with RPEC8 primary cartridge, Pilot operated, balanced piston relief main stage with integral T-8A control cavity)
PORT DESIGNATORS
Modifiers Ports
M, M/S Ports 1 & 2: SAE 16; Port T: SAE 10; Gage Port: SAE 6; Mounting Holes: .375 - 16UNC x .62 DP;
4, 4/S Ports 1 & 2: 1" Code 62; Port T: SAE 10; Gage Port: SAE 6; Mounting Holes: .375 - 16UNC x .62 DP;
4/M, 4/T Ports 1 & 2: 1" Code 62; Port T: 1/2" BSPP; Gage Port: 1/4" BSPP; Mounting Holes: M10 x 1.5-6H x .62 DP;
L, L/S Ports 1 & 2: SAE 12; Port T: SAE 10; Gage Port: SAE 6; Mounting Holes: .375 - 16UNC x .62 DP;
P, P/S Ports 1 & 2: 1" Code 61; Port T: SAE 10; Gage Port: SAE 6; Mounting Holes: .375 - 16UNC x .62 DP;
P/M, P/T Ports 1 & 2: 1" Code 61; Port T: 1/2" BSPP; Gage Port: 1/4" BSPP; Mounting Holes: M10 x 1.5-6H x .62 DP;
W, W/S Ports 1 & 2: 3/4" BSPP; Port T: 1/2" BSPP; Gage Port: 1/4" BSPP; Mounting Holes: M10 x 1.5-6H x .62 DP;
X, X/S Ports 1 & 2: 1" BSPP; Port T: 1/2" BSPP; Gage Port: 1/4" BSPP; Mounting Holes: M10 x 1.5-6H x .62 DP;
MATERIAL DESIGNATOR No modifier - inch, aluminum /S - Inch, Ductile Iron /M - Metric, Aluminum /T - Metric, Ductile Iron
INCLUDED COMPONENTS
Part Description Quantity
DSEHXHN Cartridge 1
RPECLAN Cartridge - Primary 1
TECHNICAL FEATURES
A unique feature of the hot oil shuttle is that the setting of the hot oil relief can be confirmed or adjusted when the transmission is in neutral.
The two ports marked 1 are common as are the two marked 2. Therefore the assembly can be teed off the loop rather than being plumbed into the loop.
When the transmission is in neutral the charge pressure is controlled by the charge pump relief. When the hot oil shuttle opens, some or all of the charge pump
flow is redirected to the hot oil relief. The charge pump relief must be set higher than the hot oil relief to produce hot oil flow. The higher the differential pressure
between the 2 reliefs, the higher the hot oil flow. The amount of hot oil flow is determined by the pressure vrs flow curves of the 2 reliefs and is difficult to quantify.
The standard setting of the hot oil relief is 200 psi (14 bar) at a flow of 4 gpm (16 L/min).
Hydraulic motors leak. Therefore a mechanical brake is recommended to positively lock any stopped live load.
MANIFOLD FACES
PRIMARY CARTRIDGE CONFIGURATION
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1 2 3 4
5 6 7 8
9 10 11 12
FACE GRID
Face 2
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Face 5
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Face 6
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Face 7
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Face 8
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Face 10
