DBETR Type Proportional Pressure Relief Valve for Rexroth
- Good repeatability
- Electrical closed loop position control of spring pre-tension,
- Proportional solenoid actuation with inductive position transducer (pressure balanced)
- Valve and electronic control from one source
Product features
◉ Low hysteresis
◉ Good repeatability
◉ Electrical closed loop position control of spring pre-tension,
◉ Proportional solenoid actuation with inductive position transducer (pressure balanced)
◉ Valve and electronic control from one source
Functional section
This valve regulates pressure in proportion to the electrical command value.
The valve consists basically of a housing (1), proportional solenoid (2) with inductive posistional transducer (3),valve seat (4) and valve poppet (5).
Pressure is set by adjusting the command value potentiometer (0 to 9 V). Adjusting the command value causes tensioning of the compression spring via the electronic controls and the proportional solenoid (2). Tensioning of the compression spring (6), i.e. the position of the spring plate (7), is determined by the inductive positional transducer(3). Any deviations from the command value are corrected by the closed loop positional control.
The use of this principle eliminates the effect of solenoid friction.
◉ Advantages:-Low hysteresis
◉ Good repeatability
Technical data
(for applications outside these parameters, please consult us!)
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Hydraulic data |
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Max. settable pressure |
Pressure stage 2.5 MPa |
2.5 |
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Pressure stage 8.0 MPa |
8 |
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Pressure stage 18.0 MPa |
18 |
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Pressure stage 31.5 MPa |
31.5 |
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Min. settable pressure |
(see p. 9, characteristic curves) |
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Max.Operating pressure (MPa) |
port T (with pressure adjusting) |
0.2 |
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port T (without pressure adjusting) |
10 |
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port P |
31.5 |
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Max. flow |
Pressure stage 25 |
10 |
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Pressure stage 80 |
3 |
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Pressure stage 180 |
3 |
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Pressure stage 315 |
2 |
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Degree of contamination |
(μm) |
< 20 (recommendation 10) |
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Hysteresis |
(%) |
< 1 of max. settable pressure |
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Repeatability |
(%) |
< 0.5 of max. settable pressure |
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Linearity |
(%) |
180; Pressure stage from 3 to 18 MPa |
< 1.5 of max. settable pressure |
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315; Pressure stage from 6 to 31.5MPa |
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Typical variation |
(%) |
Valve |
± 3 of max. settable pressure |
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Electrical control |
< 0.5 |
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Stepped response |
0 to 100% |
(ms) |
Response time (Pmin-Pmax) |
Response time (Pmax-Pmin) |
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Pressure stage 2.5 and 18MPa |
0 to 100 |
100 |
50 |
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Pressure stage 31.5MPa |
0 to 100 |
150 |
100 |
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Pressure fluid |
Mineral oil (for NBR seal),Phosphate ester (for FPM seal) |
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Viscoity range |
[mmPa] |
2.8 to 380 |
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Pressure fluid temperature range |
(°C) |
-20 to +70 |
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Installation position |
optional |
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Weight |
(kg) |
4 |
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Electrical |
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Amplifier associated |
VT-5003S30 |
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Supply voltage |
DC |
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Coll resistance |
Cold value at 20 °C |
10 |
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Max. warm value |
13.0 |
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(Working state) Duty |
Continuous |
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Pressure fluid temperature |
(°C) |
+50 |
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Amplifier voltage |
commutate completely |
24 ± 10% |
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commute three electrical source |
24 to 35 |
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Max. power consumption |
(VA) |
50 |
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Coll resistance at 20 °C |
(Ω) |
1 |
11 |
111 |
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56 |
56 |
112 |
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Inductivity (transducer) |
[mH] |
8 to 8 |
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Oscillator frequency (transducer) |
[KHz] |
2.5 |
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Protection to DIN 40 050 |
IP65 |
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Characteristic curves
(measured at ν=36 × 10⁻⁶ m²/s t=50°C )
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