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Dual Relief Valves 1DDR35 - Integrated Hydraulics


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1DDR35 SERIES DUAL RELIEF VALVE DIRECT ACTING
1DDR35
POPPETTYPE
P1
P1
3
i P2
P2
APPLICATION
To protect directional valves and actuators from shock or surge pressures induced by changes in direction or sudden stops which create excessive load conditions.
FEATURES
Soft start and stop with fast acting operation to give maximum protection to expensive actuators. Reduces plumbing to a minimum.
SPECIFICATIONS
Figures based on: Oil Temp = 40°C Viscosity = 40 cSt
OPERATION
The dual relief is of the cross line type, where exhaust oil from one line is transferred to the other, negating the need for a separate tank line. It also prevents cavitation when used in conjunction with a closed centre directional valve. For greatest protection the valve should be mounted as close to the actuator or motor as possible.
Note for single rod cylinders, anti-cavitation check valves and a separate tank line are necessary. See page number 3-151.
PRESSURE DROP
Rated Flow
30 litres/min (8 US GPM)
Max Setting
350 bar (5000 psi)
Cartridge Material
Working parts hardened and ground steel. External surfaces zinc plated
Body Material
Standard aluminium (up to 210 bar*) Add Suffix '377' for steel option
Mounting Position
Line mounted
Weight
0.58 kg (1.28 lbs)
Seal Kit Number
SK243 (Nitrile) SK243V (Viton)
Recommended Filtration Level
BS5540/4 Class 18/13 (25 micron nominal)
Operating Temp
-20°C to +90°C
Leakage
0.3 millilitres/min max (5 dpm)
Nominal Viscosity Range
5 to 500 cSt
FLOW-US GPM 2.5 5_7.5 10 12.5
6000
400 350 300 250
200
150 100
50
5000
CE
<
DÛ LLI CE Z)
w w
LU CE CL
■fi 1.
X ■/1 ■/1
1.
4000
3000
2000
1000
0
20 30 40 50
FLOW LITRES/MIN
10
*For applications above 210 bar please consult our technical department or use the steel body option.
Integrated Hydraulics Ltd
Collins Road, Heathcote Ind. Est., Warwick, CV34 6TF, UK. Tel: +44 (0) 1926 881171 Fax: +44 (0) 1926 315729 Website: www.integratedhydraulics.com
Integrated Hydraulics Inc
7047 Spinach Drive, Mentor, Ohio 44060, USA Tel: (440) 974 3171 Fax: (440) 974 3170 Website: www.integratedhydraulics.com
3-111.C

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