Proportional pressure reducing valve, pilot-operated 3DRE(M)E

Description

• Size 10, 16
• Component series 7X
• Maximum set pressure 315 bar
• Maximum flow 300 l/min

Features

• 3-way version
• Operation by means of proportional solenoid with rotatable coil
• For subplate mounting
• Porting pattern according to ISO 4401
• Maximum pressure limitation, optional
• Valve and control electronics from a single source
• Integrated electronics (OBE) with little manufacturing tolerance of the command value pressure characteristic curve
• Linear command value pressure characteristic curve

Product description

Valves of type 3DRE(M)E are electrically pilot-operated 3-way pressure reducing valves with pressure limitation of the actuator.

They are used for reduction (P to A) and limitation (A to T) of a system pressure.

Set-up

The valves consist of two main assemblies:

• Pilot control valve (1) with proportional solenoid (2) and integrated electronics (OBE) (17), optionally with maximum pressure limitation (15). Supply and command value voltage are applied at the connector (16). At the factory, the command value pressure characteristic curve is adjusted with little manufacturing tolerance.

• Main valve (3) with main control spool (4)

Function

• Command value-dependent setting of the pressure to be reduced in port A via the pilot control valve (1).

• With depressurized port P, the springs (5) and (6) hold the main control spool (4) in its central position. In this way, a start-up jump at the actuator is prevented.

• Pilot fluid flows from bore (7) via the flow controller (8), via the control chamber (11) to the throttle gap (9), via line (10) to port Y. This connection is to be led into the tank at zero pressure.

Pressure reduction

• Build-up of the pilot pressure in the control chamber (11) as function of the command value.

• Pressure build-up in the spring chamber (13) via nozzle (12) and movement of the main control spool (4) to the right. Hydraulic fluid flows from P to A.

• The actuator pressure in port A is available in the spring chamber (14).

• Increase in the pressure in port A to the set pressure of the pilot control valve (1) leads to the movement of the main spool (4) to the left. Pressure in port A is almost identical with the set pressure at the pilot control valve (1).

Pressure limitation

• If the pressure in port A exceeds the set pressure of the pilot control valve (1), the main control spool (4) is moved further to the left.

• This opens the connection from A to T and limits the pressure pending in port A to the set command value.

Type 3DREME

For hydraulic protection against an inadmissibly high electric control current at the proportional solenoid, which imperatively results in increased pressures in port A, you can optionally install a spring-loaded pressure relief valve as maximum pressure limitation (15). The maximum pressure limitation is pre-set, referred to the relevant pressure rating (see "Technical data").

Pilot oil supply

Size 10

Size 16

Version "XY"

The pilot oil is supplied externally from a separate pilot circuit. The pilot oil return is implemented externally via port Y into the tank.

Version "Y"

The pilot oil supply is implemented internally from channel P of the main valve. The pilot oil return is implemented externally via port Y into the tank. In the subplate, port X is closed.

Type code

Technical data

general

hydraulic

electrical

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

(measured with HLP46, ϑOil = 40 ±5 °C)

Size 10

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 50 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 100 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 200 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 315 bar

Δp-qV characteristic curves

Pressure in port A dependent on the flow

Minimum set pressure dependent on the flow (Command value 0)

Notice:

Valve body and hydraulic fluid temperature-compensated; large temperature differences may lead to differing values.

Size 16

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 50 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 100 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 200 bar

Pressure in port A dependent on the command value (flow = 0 l/min)

Pressure rating 250 bar

Δp-qV characteristic curves

Pressure in port A dependent on the flow

Minimum set pressure dependent on the flow (Command value 0)

Notice:

Valve body and hydraulic fluid temperature-compensated; large temperature differences may lead to differing values.

Symbols/Circuit diagrams

"3DREE…Y…"	"3DREME…Y…"	"3DREE…XY…"	"3DREME…XY…"

Electrical connection

Block diagram

Function

The electronics are supplied with voltage via ports A and B. The command value is applied to the differential amplifier ports D and E. Via the characteristic curve generator, the command value solenoid current characteristic curve is adjusted to the valve so that non-linearities in the hydraulic system are compensated and thus, a linear command value pressure characteristic curve is created. The current controller controls the solenoid current independently of the solenoid coil resistance. The power stage of the electronics for controlling the proportional solenoid is a chopper amplifier with a clock frequency of approx. 180 Hz to 400 Hz. The output signal is pulse-width modulated (PWM). For checking the solenoid current, a voltage can be measured at the connector between pin F(+) and pin C(–) that is proportional to the solenoid current. 1 mV corresponds to 1 mA solenoid current.

Connector pin assignment "A1" and "F1"

Connection cable

Recommendation:
– 6-wire, 0,75 mm2 or 1 mm2 plus protective grounding conductor and screening
– Only connect the screening to PE on the supply side.
– Maximum length 100 m
– The minimum supply voltage at the power supply unit depends on the length of the supply line (see diagram).

Dimensions

Size 10

Dimensions in mm

Required surface quality of the valve contact surface

Notices:

• Deviating from ISO 4401, port T is called TA, port T1 is called TB.

• The dimensions are nominal dimensions which are subject to tolerances.

Valve mounting screws (separate order)

Notices:

• For reasons of stability, exclusively the specified valve mounting screws may be used.

• The tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure.

Size 16

Dimensions in mm

Required surface quality of the valve contact surface

Notices:

• Deviating from ISO 4401, port T is called TA, port T1 is called TB.

• The dimensions are nominal dimensions which are subject to tolerances.

Valve mounting screws (separate order)

Notices:

• For reasons of stability, exclusively the specified valve mounting screws may be used.

• The tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure.

Subplates (separate order) with porting pattern according to ISO 4401, see data sheet 45100.

Accessories

Mating connectors for valves with round connector, 6-pole + PE

7P Z31

Mating connectors for valves with round connector, 6-pole + PE

7P Z31

• For valves with round connector according to EN 175201-804, 6-pole + PE as well as 6-pole, compatible with VG 95328

• Data sheet

• Spare parts and repair

Ordering codes

Downloads

Proportional pressure reducing valve, pilot-operated Data Sheet | RE29286 | 2020-01-01 | English | PDF | 984k Product Groups: Pilot operated Type 3DRE(M) and 3DRE(M)E