Detailed description

This pilot operated 2-stage proportional directional valve is equipped with electrical position feedback of the main control spool and integrated electronics (OBE), which ensures precise monitoring and regulation of the main spool’s position for stable and accurate operation. Its core function is to control both the flow direction and the flow rate size, realizing flexible adjustment of fluid transmission according to actual working requirements. The valve is operated by proportional solenoids, which provide stepless and precise control signals to drive the valve core movement. It adopts subplate mounting, and its porting pattern strictly complies with ISO 4401 standard, ensuring good interchangeability and compatibility with other standard hydraulic components. The main control spool is spring-centered, enabling automatic reset to the neutral position when the control signal is cut off, improving operational safety. The pilot control valve is a single-stage proportional directional valve, which provides stable pilot pressure to control the action of the main stage. In addition, the main stage is equipped with position control function, further enhancing the control accuracy and stability of the valve.

Technical data

(for applications outside these parameters, please consult us!)

general

Sizes	Size	10	16	25	27	32	35
Installation position and commissioning information		Preferably horizontal, see RE 07800
Storage temperature range	℃	-20 to +80
Ambient temperature range	℃	-20 to +50
Weight	kg	8.7	11.2	16.8	17	31.5	34
Sine test according to DIN EN 60068-2-6:2008 ¹⁾		10 cycles, 10...2,000..10 Hz with logarithmic frequency changing speed of 1 oct./min, 5 to 57 Hz, amplitude 1.5 mm (p-p), 57 to 2,000 Hz, amplitude 10 g, 3 axes
Random test according to DIN EN 60068-2-64:2009 ¹⁾		20..2,000 Hz, amplitude 0.05 g²/Hz (10 g_RMS) 3 axes, testing time 30 min per axis
Shock test according to DIN EN 60068-2-27:2010 ¹⁾		Half sine 15 g/11 ms, 3 times in positive and 3 times in negative direction per axis, 3 axes
Humid heat, cyclic according to DIN EN 60068-2-30:2006		Variant 2 +25 ℃ to +55 ℃, 90% to 97% relative humidity, 2 cycles with 24 hours each

^1）The information on mechanical load applies to the fastening level of the integrated valve electronics.

hydraulic (measured at p= 100 bar with HLP46 at 40 ℃± 5 ℃)

Operating pressure	Pilot control valve	Pilot oil supply	bar	25 to 315
	Main valve, connection P, A, B		bar	Up to 315	Up to 350	Up to 350	Upto 210	Up to 350	Up to 350
Return flow pressure	Connection T	Pilot oil drain,	bar	Static < 10 (pilot control valve)
		internal	bar
		Pilot oil drain,	bar	Up to 315	Up to 250	Up to 250	Upto 210	Up to 250	Up to 250
		internal	bar
	Connection Y		bar	Static < 10 (pilot control valve)
Rated flow q_Vnom ± 10% with Δp= 10 bar Δp = valve pressure differential			l/min	－	125	－	－	－	－
				25	150	－	－	－	－
				50	200	220	－	400	－
				100	220	350	500	600	1000
Recommended maximum flow			l/min	170	460	870	1000	1600	3000
Pilot oil flow at port X and/or Y with stepped input signal from 0 to 100% (315 bar)			l/min	4.1	8.5	11.7	11.7	13.0	13.0
Hvdraulic fluid				See table page 7
Maximum admissible degree of contamination of the hydraulic fluid - cleanliness class according to ISO 4406 (c)				Pilot control valve: Class 17/15/12 ¹⁾Main stage: Class 20/18/15¹⁾
Hydraulic fluid temperature range			℃	-20 to +80, preferably +40 to +50
Viscosity range			mm²/s	20 to 380, preferably 30 to 45
Hysteresis			％	≤ 1
Response sensitivity			％	≤ 0.5

¹⁾ The cleanliness classes stated for the components need to be maintained in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components.For the selection of the filters see www.boschrexroth.com/filter

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons		HL, HLP	NBR,FKM	DIN 51524
Flame-resistant	－containing water	HFC (Fuchs HYDROTHERM 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922
Phosphoric acid ester		HFD-R	FKM
Important information on hydraulic fluids! -For more information and data on the use of other hydraulic fluids refer to data sheet 90220 or contact us! -There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)! -The flash point of the process and operating medium used must be 40 K greater than the maximum solenoid surface temperature. - Flame-resistant- containing water: Maximum pressure differential per control edge 175 bar. Pressure pre-loading at the tank port > 20% of the pressure differential; otherwise, increased cavitation. - Life cycle as compared to operation with mineral oil HL,HLP 50% to 100%

Electrical

Voltage type	Direct voltage
Signal type	Analog
Maximum power W	72 (average = 24 W)
Electrical connection	Mating connector according to DIN EN 175201-804
Protection class of the valve according to EN 60529	IP65 with mating connector mounted and locked
Control electronics	Integrated in the valve, see page 8

Connector pin assignment	Contact	Signal with A1	Signal with F1	Signal with A5
Supply voltage	A	24 VDC (18 to 35 VDC);I_max= 1.5 A;impulse load ≤ 3 A
	B	0 V
Reference (actual value)	C	Reference potential for actual value (contact "F")		Enable 4to 24 V
Differential amplifier input	D	±10V	4 to 20mA	±10V
(Command value)	E	0 V reference potential to pin D		0 V reference poten-tial for pin D and F
Measuring output (actual value)	F	±10V	4 to 20mA	±10V
	PE	Connected to cooling element and valve housing

Command value:

Reference potential at E and positive command value at D result in flow from P→A and B→T.

Reference potential at E and negative command value at D result in flow from P→B and A→ T.

Connection cable:

Recommendation: - Up to 25 m line length: Type LiYCY 7×0.75 mm²

- Up to 50 m line length: Type LiYCY 7× 1.0 mm²

Only connect the shield to PE on the supply side.

Notice:

Electric signals taken out via valve electronics (e.g. actual value) must not be used for switching off safety-relevant machine functions!

Hydraulic Proportional Valve Integrated Electronics 4WRKE