Created on 03/04/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
PRDL
Electro-proportional, direct-acting, pressure reducing/relieving valve with open
transition
SERIES 1 / CAPACITY: 20 L/min. / CAVITY: T-11A
M-Control
E-Control
K and L-Control X-Control
This electro-proportional, direct-acting reducer/reliever valve reduces a high primary pressure at the inlet (port 2) to
a constant reduced pressure at port 1, with a full flow relief function from port 1 to tank (port 3). The valve is biased
to the relieving mode. Energizing the coil connects port 2 to port 1. Increasing the current to the coil will
proportionally increase the reduced pressure at port 1. If pressure at port 1 exceeds the setting induced by the coil,
pressure at port 1 is relieved to port 3. This valve is open in the transition from reducing to relieving. It provides
good pressure control and dynamic response. Optional full manual control is available.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 330 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: 990-511-007
Seal kit - Cartridge Viton: 990-511-006
PROPORTIONAL PERFORMANCE DATA
Hysteresis (with dither) 6%
Hysteresis with DC input <8%
Linearity (with dither) <2%
Repeatability (with dither) <2%
Recommended dither frequency 140 Hz
(M)CONTROL
M Manual Override (Standard)
E Twist (Extended) Manual Override
L Standard Screw Adjustment
X No Manual Override
(D)OPERATING RANGE
D 50 - 485 psi (3,5 - 33,5 bar)
E 25 - 250 psi (1,7 - 18 bar)
B 100 - 1125 psi (7 - 77,5 bar)
S 10 - 100 psi (0,7 - 7 bar)
(N)SEAL MATERIAL
N Buna-N
E EPDM
V Viton
COIL *
No coil
212 DIN 43650 3 pin (Hirschman), 12 VDC
224 DIN 43650 3 pin (Hirschman), 24 VDC
712 Twin Lead, 12 VDC
snhy.com/PRDL
Please verify cartridge clearance requirements when choosing a Sun manifold. Different valve controls and coils require different clearances.
NOTES
Model Code Example: PRDLMDNCONFIGURATION OPTIONS
Created on 03/04/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
724 Twin Lead, 24 VDC
912 Deutsch DT04-2P, 12 VDC
924 Deutsch DT04-2P, 24 VDC
* Additional coil options are available
TECHNICAL FEATURES
Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 3000 psi (210 bar).
The transition from reducing to relieving is slightly open. The result is very good pressure control with oil consumption of about 0.1 gpm (0,4 L/min.).
For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a
separate check valve to the circuit.
Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.
All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When
considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges.
NOTE: There is no upper limit to the pressure setting when using the M control. The more force you exert on the manual override, the higher the resulting pressure.
The 'E' manual control assembly has a mechanical life expectancy of approximately 7,000 cycles.
The momentary/twist override option "E" allows the operator to shift the valve by twisting the manual override clockwise 90 degrees.
Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage
the seals.
Uses for the 'L' manual screw adjustment include: emergency valve setting during power failure or alternatively boosting the valve setting
With the 'L' adjustment screw, all ranges are factory set at zero (adjustment screw fully backed out). With the coil de-energized, clockwise adjustment of the screw
will increase the spring bias load up to the maximum setting for that range. With the coil energized, any mechanical pressure setting is directly additive to the coil
induced value.
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
