Directional spool valves, pilot operated, with electro-hydraulic actuation H-WEH...=UR

Description

• Solenoid coil is an approved component with UR-marking according to UL 906
• Size 10, 16, 25 (H-WEH22), 25 (H-WEH25), 32
• Component series 4X, 7X, 7X, 6X, 6X
• Maximum operating pressure 350 bar
• Maximum flow 1100 l/min

Features

• Concealed manual override
• For subplate mounting
• Porting pattern according to ISO 4401
• 4/3-, 4/2- or 3/2-way version
• Spring or pressure centering, spring end position or hydraulic end position
• Wet-pin DC or AC solenoids, optional
• Electrical connection as individual connection
• Optional versions:
  - Switching time adjustment
  - Preload valve in channel P of the main valve
  - Stroke setting and/or spool position monitoring

Product description

Notices:

The return springs (3.1) and (3.2) in the spring chambers (6) and (8) hold the main control spool (2) in central position without pilot pressure even with, for example, vertical valve positioning.

Due to the design principle, internal leakage is inherent to the valves, which may increase over the life cycle.

4/3 directional valve with pressure centering of the main control spool, type H-WEH…H

The main control spool (2) in the main valve is kept in the zero position by pressurization of the two front faces. One centering bush (12) rests on the housing and fixes the control spool position. By pressure relief of one front face, the main control spool (2) is moved to the switching position. The unloaded control spool face displaces the returning pilot oil into channel Y (external) via the pilot control valve.

Notices:

The springs (3.1) and (3.2) do not have a return function in this version. They hold the main control spool (2) in central position in the depressurized condition and with horizontal installation.

Pilot oil supply (schematic illustration)

Size 10

NG16

NG25 („W.H 22“)

NG25 („W.H 25“)

Size 32

Type H-WEH...

The pilot oil supply is implemented externally - via channel X - from a separate pressure supply.

The pilot oil return is implemented externally via the Y channel into the tank.

Type H-WEH…E…

The pilot oil supply is implemented internally from channel P of the main valve. (see Technical data)

The pilot oil return is implemented externally - via channel Y - in the tank. In the subplate, port X is closed.

Type H-WEH...ET...

The pilot oil supply is implemented internally from channel P of the main valve.

The pilot oil return is implemented internally via the channel T into the tank. In the subplate, ports X and Y are closed.

Type H-WEH...T...

The pilot oil supply is implemented externally - via channel X - from a separate pressure supply.

The pilot oil return is implemented internally via the channel T into the tank. In the subplate, port Y is closed.

Throttle insert

Use of the throttle insert (5) is necessary if the pilot oil supply in channel P of the pilot control valve is to be limited. The throttle insert (5) is inserted in channel P of the pilot control valve.

Notices:

The modification of the pilot oil supply may only be performed by authorized specialists or at the factory!

• Pilot oil supply X or return Y external:
  • The maximum admissible operating parameters of the pilot control valve must be observed (see data sheet 23208)!
  • Maximum pilot pressure: please observe the Technical data!

• Pilot oil supply internal (version "ET" and "E"):
  • Minimum pilot pressure: please observe the Technical data!
  • In order to prevent inadmissibly high pressure peaks, a "B10" throttleinsert has to be provided in port P of the pilot control valve.
  • In connection with version "H", the pressure reducing valve "D3" (see switching time adjustment) is also required.

Type code

Technical data

general

hydraulic

Free flow cross-sections in zero position with spools Q, V and W

Important notice on hydraulic fluids:

• For more information and data on the use of other hydraulic fluids, please refer to the data sheets above or contact us.

• There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.).

• The ignition temperature of the hydraulic fluid used must be 50 K higher than the maximum solenoid surface temperature.

• Flame-resistant – containing water:
  • Maximum pressure differential per control edge 50 bar
  • Pressure pre-loading at the tank port >20% of the pressure differential, otherwise increased cavitation erosion
  • Life cycle as compared to operation with mineral oil HL, HLP 30 ... 100%

• Bio-degradable and flame-resistant:
  • If these hydraulic fluids are used, small amounts of dissolved zinc may get into the hydraulic system (700 mg zinc per pole tube).

Notices:

• Switching times = Contacting at the pilot control valve until start of opening of the control edge in the main valve and change in the control spool stroke by 95%)

• The switching times are measured according to ISO 6403 with HLP46, ϑoil = 40 °C ± 5 °C. With different oil temperatures, variations are possible!

• The switching times were determined using DC solenoids. They decrease by approx. 20 ms if AC solenoids are used.

• The shut-off of the solenoids creates voltage peaks, which can be reduced by the use of suitable diodes.

• The switching times increase by approx. 30 ms if the pressure reducing valve "D3" is used.

• The switching times have been determined under ideal conditions and may differ in the system, depending on the application conditions.

Inductive position switch type QM: electrical connection

The electric connection is realized via a 4-pole mating connector (separate order) with connection thread M12 x 1.

electrical

Connection voltage (DC voltage)			V	24
Voltage tolerance (connection voltage)				+30 %/-15 %
Admissible residual ripple			%	≤ 10
Max. load capacity			mA	400
Switching outputs				PNP transistor outputs, load between switching outputs and GND
Pinout	1		V	24
	2, 4	Switching output	mA	400
	3	Earthing (GND)	V	0

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

Diagrams/characteristic curves

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

Δp-qV characteristic curves

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

Performance limits

Performance limits

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

Δp-qV characteristic curves

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

Performance limits

Performance limits

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

Δp-qV characteristic curves

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

Performance limits

Performance limits

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

Δp-qV characteristic curves

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

Performance limits

Performance limits

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

Δp-qV characteristic curves

Symbol E, R and W

Δp-qV characteristic curves

Symbol G and T

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

Performance limits

Performance limits

Performance limits : Important information

Notice (applies to all sizes):

The specified performance limits apply to the use with two directions of flow (e. g. from P to A and simultaneous return flow from B to T at a ratio of 1:1). Due to the flow forces acting within the valves, the admissible performance limit may be considerably lower with only one direction of flow (e. g. from P to A while port B is blocked, with flow in the same or in different directions). In such cases of use, please consult us.

The performance limit was determined when the solenoids were at operating temperature, at 10 % undervoltage and without tank preloading.

Symbols/Circuit diagrams

2 spool positions

Ordering code		Type of actuation
Symbol	Control spool return	Type H-WEH (electro-hydraulic)
A 1), C, D, K, Z	../..
	..H../..
	..H../O
	..H../OF
B 1), Y	../..
	..H../..

3 spool positions

Ordering code			Type of actuation
Symbol	Actuating side	Control spool return	Type H-WEH (electro-hydraulic)
E, F, G, H, J, L, M, P, Q, R, S, T, U, V, W		../..
	.A
	.B
		..H../..
		H.A
		H.B

Symbols for valves with 2 spool positions

Symbols for valves with 3 spool positions

Notice:

3-spool position valves, pressure-centered, preferably with external pilot oil supply and or return (“no code”, “E”) Precondition for internal pilot oil supply and/or return (“ET”, “T”).

Inductive position switch type QM Switching logics

Version QMA

Position switch on side B, monitored spool position of the main stage "a"

Version QMA

Position switch on side B, monitored spool position of the main stage "a"

Version QMB

Position switch on side A, monitored spool position of the main stage "b"

Version QMB

Position switch on side A, monitored spool position of the main stage "b"

version QMAB

Position switch on side A and B, monitored spool position "a" and "b"

Version QM0

Position switch on side A and B, monitored spool position "0"

Version QM0

Position switch on side B, monitored spool position of the main stage "0"

Version QM0

Position switch on side A, monitored spool position of the main stage "0"

Dimensions

Size 10

Dimensions in mm

Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Size 16

Dimensions in mm

Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

NG25 („W.H 22“)

Dimensions in mm

Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

NG25 („W.H 25“)

Dimensions in mm

Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Size 32

Dimensions in mm

Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

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

Valve mounting screws (separate order)

– NG10:

4 hexagon socket head cap screws, metric

ISO 4762 - M6 x 45 - 10.9-flZn-240h-L

(Friction coefficientμtotal = 0.09 to 0.14);

Tightening torque MA = 12.5 Nm ± 10%,

material no. R913000258

4 hexagon socket head cap screws UNC 1/4-20 UNC x 1 3/4″ ASTM-A574

upon request

– NG16:

4 hexagon socket head cap screws, metric

ISO 4762 - M10 x 60 - 10.9-flZn-240h-L

(friction coefficientμtotal = 0.09 to 0.14);

Tightening torque MA = 75 Nm ± 10%,

Material no. R913000116

2 hexagon socket head cap screws, metric

ISO 4762 - M6 x 60 - 10.9-flZn-240h-L

(Friction coefficient μtotal = 0.09 to 0.14);

Tightening torque MA = 12,5 Nm ± 10%,

material no. R913000115

4 hexagon socket head cap screws UNC 3/8-16 UNC x 2 1/4″ ASTM-A574

upon request

2 hexagon socket head cap screws UNC 1/4-20 UNC x 1/4″ ASTM-A574

upon request

– NG25:

6 hexagon socket head cap screws, metric

ISO 4762 - M12 x 60 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

Tightening torque MA = 130 Nm ± 10%,

Material no. R913000121

6 hexagon socket head cap screws UNC 1/2-13 UNC x 2 1/2″ ASTM-A574

upon request

– NG32:

6 hexagon socket head cap screws, metric

ISO 4762 - M20 x 80 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

Tightening torque MA = 430 Nm ± 10%,

Material no. R901035246

6 hexagon socket head cap screws UNC 3/4-10 UNC x 3 1/4″ ASTM-A574

upon request

The stroke of the control spool is limited by the stroke setting (1). The control spool stroke is shortened by loosening the lock nut (2) and clockwise rotation of the adjustment spindle (3). The control chamber (4) must be depressurized for this.

5 adjustment range

• NG10:
  • 1 rotation = 1 mm adjustment travel

• NG16 to 32:
  • 1 rotation = 1.5 mm adjustment travel

Stroke limitation on side A

Stroke limitation on side B

Spool position monitoring

Inductive position switch type QM

Dimensions in mm

Project planning information

Switching time adjustment

Type 4WEH…S
;Type 4WEH…S2

The switching time of the main valve (1) is influenced by using a twin throttle check valve (2) (type Z2FS 6; data sheet 27506).

Modification of supply (3) to discharge control (4):

Remove the pilot control valve (5) – The plate (6) to accept the seal rings stays in place – Turn the switching time adjustment (2) around its longitudinal axis and put it back, install the pilot control valve (5).

Notice:

The modification may only be performed by authorized specialists or at the factory!

"D3” pressure reducing valve

Type 4WEH 10 ..4X/…/..D3

The pressure reducing valve (8) has to be used at a pilot pressure above 250 bar (with type 4W.H 22 …: 210 bar) and with version “H”.

The secondary pressure is kept at a constant level of 45 bar.

Notice:

• If a pressure reducing valve "D3" (8) is used, a "B10" throttle insert has to be installed in channel P of the pilot control valve.

• The modification may only be performed by authorized specialists or at the factory!

Preload valve (not for NG10)

In case of valves with depressurized circulation and internal pilot oil supply, the installation of the preload valve (9) in channel P of the main valve is required in order to build up the minimum pilot pressure.

The pressure differential of the preload valve is to be added to the pressure differential of the main valve (see characteristic curves) to result in one total value.

The cracking pressure is approx. 4.5 bar.

Notice:

Series-production status, see ordering key on the name plate.

Δp–qVcharacteristic curve (measured with HLP46, ϑOil = 40 °C ± 5 °C)

The stipulations of the Machinery Directive 2006/42/EC are to be adhered to. Please also note data sheet 08012 with information on MTTFD values and shock and vibration loads.

Ordering codes

Downloads

Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet | RE24802 | 2016-12-01 | English | PDF | 1.1MB Product Groups: Pilot operated Type WEH…=UR