HYDRAULIC SERVO VALVES – S6 PRO

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Hydraulic Servo Valves – S6 Pro

The Domin S6 Pro direct drive servo valve (DDV) has been designed to achieve the best characteristics from two competing valve technologies: fluid amplified EHSVs and DDVs. The S6 Pro has the size, mass, and dynamic capabilities of the most compact EHSV, and the low quiescent leakage and reliability of the best DDV.

For applications requiring the results of the S6 Pro X, the S6 Pro model can be upgraded with a mounting plate adapter to achieve the same functionality.

Discover Ultimate Power Density

Experience optimal performance without compromise. Whether in test simulation or industrial manufacturing, the S6 Pro ensures seamless operations and maximum productivity, thanks to its superior design and exceptional power density.

With the Domin S6 Pro, you get the best of both worlds: the size, mass, dynamic capabilities, and industry-leading power density of the most advanced two-stage valves, paired with low quiescent leakage and unwavering reliability. Experience effortless efficiency, precision and power with the Domin S6 Pro series.

Available on NG06 port pattern as standard.

Key Stats:

Hysteresis: <0.2%
Leakage: <0.3gpm (<1.1 l/min)
Mass: 1.21lbs (550g)
Frequency Response: >190Hz
Rated Flow: 5-16gpm (18-60 l/min)
Response Time: <3.5 ms

Key Features:

Onboard electronics with spool position feedback
Rated flow of up to 16gpm (60 l/min) (at 1,015 psi (70 bar))
Based on the NG06 port pattern
Bandwidth > 190 Hz (-3 dB, up to ± 25% FS)
Low power consumption of less than 5 W
Chip shear capability of greater than 89lbf (400 N)
Low weight of less than 1.5lbs

Standard Modification Options:

Choice of rated flow up to 16gpm (60 l/min)
Multiple voltage or current control options
Various seal materials available
Non-standard configurations available

Technical Data:

Design		Direct Drive Servo Valve
Actuation		Rotary-Linear
Size		NG06
Mounting Interface		ISO 4401-03-02
Ambient Temperature	ºC (ºF)	-20 to +60 (-4 to +140)
Mass	kg (lb)	0.55 (1.21)
Vibration Resistance, All Axes	g	30
Shock Resistance, All Axes	g	50

Max. Operating Pressure (P, A, B)	Bar (psi)	350 (5,000)
Max. Operating Pressure (T)	Bar (psi)	250 (3,600)
Fluid		Hydraulic Oil DIN 51524-535
Fluid Temperature	ºC (ºF)	-20 to +80 (-5 to +175)
Viscosity	cSt	5 to 500
Rated Flow	l/min (US gal / min)	10 to 63 (2.6 to 16.6)
Flow Maximum	l/min (US gal / min)	130 (34.3)
Leakage at 100 bar	l/min (US gal / min)	<1.1 (0.3)
Filtration		ISO 4406 (1999) 18/16/13

Response Time at 100% Step Input	ms	<3.5
Frequency Response (-3dB gain, ±25% signal)	Hz	>220
Frequency Response (-90deg phase, ±25% signal)	Hz	>120
Hysteresis	%	<0.2
Threshold	%	<0.1
Null Shift	%	<1

View performance graphs for the S6 Pro Domin Servo Valve below including Step Response, Flow vs Command, Frequency Response, and Pressure Gain:

Ratings of the valve electronics vary based on selected command input.

Absolute Maximum Ratings*		Min.	Typ.	Max.
Supply Voltage	V	0	–	30
Differential Input Signal	V	-10.5	–	10.5
Input Signal Common Mode Offset	V	-24	–	24
Output Signal Current	mA	-50	–	50

Normal Operating Conditions		Min.	Typ.	Max.
Supply Voltage	V	22	24	30
Absolute maximum current draw **	A	–	–	4.5
Differential Input Signals	V	-10	–	10
Input Impedance	KΩ	200	–	–
Output Signal	V	-10	–	10
Output Impedance	Ω	–	150	–
Output Load Impedance	KΩ	1	–	–

Absolute Maximum Ratings*		Min.	Typ.	Max.
Supply Voltage	V	0	–	30
Differential Input Signal	mA	-25	–	25
Input Signal Common Mode Offset	V	-24	–	24
Output Signal Current	mA	-50	–	50

Normal Operating Conditions		Min.	Typ.	Max.
Supply Voltage	V	22	24	30
Peak Current Consumption**	A	–	–	4.5
Differential Input Signals	mA	20	–	20
Input Impedance***	Ω	–	392	–
Output Load Impedance****	Ω	–	–	650

Absolute Maximum Ratings*		Min.	Typ.	Max.
Supply Voltage	V	0	–	30
Voltage Mode Differential Input Signal	mA	-25	–	25
Input Signal Common Mode Offset	V	-24	–	24
Output Signal Current	mA	-50	–	50

Normal Operating Conditions		Min.	Typ.	Max.
Supply Voltage	V	22	24	30
Peak Current Consumption**	A	–	–	4.5
Differential Input Signals	mA	4	–	20
Differential Input Signals for Drive Off*****	mA	-20	–	2
Input Impedance***	Ω	–	392	–
Output Load Impedance****	Ω	–	–	650

Valves can be provided with an enable function. This allows the valve to be enabled or disabled by varying the voltage into the enable pin. Note that valves with code C command type can also be enabled or disabled using the command signal; see the corresponding table for further details.

Normal Operating Conditions		Min.	Typ.	Max.
Voltage for Drive Enable	V	9	–	28
Voltage for Drive Disable	V	0	–	5
Input Impedance	Ω	50	–	–

* Conditions outside of the absolute maximum ratings may cause permanent damage to the valve. Operation of the product outside of the nominal operating conditions is not guaranteed and may affect product reliability.

** The valve supply must be protected with a 5 AT fuse or equivalent overcurrent protection device.

*** Valves with a current command signal use a 0.1% tolerance shunt resistor to measure demand current.

**** The value of the shunt resistor to measure output current should not exceed stated maximum value.

***** A current in this range will disable the motor drive until a current outside this range is received at the command input.

Type: Case Mounted
Termination: Connector according to EN 175201-804/MIL 5015 equivalent, shell size 14
Number of Contacts: 7

Pin	Function	Desc.
A	Supply +	+24 V
B	Supply 0 V	0 V
C	Output – Enable Input	Output 0 V Reference Drive Enable Input*
D	Input +	Differential Input, +
E	Input –	Differential Input, –
F	Output +	Output Signal
G	Earth	–

* When the enable function is selected, the function of pin C is the enable input. This replaces the standard pin function.

Type: Case Mounted
Termination: Connector according to EN 175201-804/MIL 5015 equivalent, shell size 14
Number of Contacts: 4

Pin	Function	Desc.
A	Supply +	+24 V
B	Input +	Differential Input, +
C	Input –	Differential Input, –
D	Supply 0 V	0 V

Unit Dimensions – Connector Code B4

Unit Dimensions – Connector Code E and E4

Nominal dimensions are displayed in mm. Bracketed dimensions are in inches. Not to scale. Note X and Y directions.

Mounting Surface Pattern Dimensions

	Dia Ø mm	X Position mm	Y Position mm
P	7.5	21.5	25.9
A	7.5	12.7	15.5
B	7.5	30.2	15.5
T	7.5	21.5	5.1
F1	M5	0	0
F2	M5	40.5	-0.75
F3	M5	40.5	31.75
F4	M5	0	31

Bolts (F1, F2, F3, F4)

Type: M4 x 55 DIN EN ISO 4762-10.9
Required Torque: 7.5 Nm (5.53 ft-lbf)

O-Rings (P, A, B, T)

Type: 9.25 x Ø 1.78 (ISO 3601-1-008)
Material: NBR, EPDM or Viton, 70 Shore A
Hardness: 70 Shore A

Not to scale.

Standards Reference

EMC Regulations: EN 61000-6-2 / EN550011:1998+A1
Performance Tests: ISO 10770-1
Pressure Rating: ISO 10771
Hydraulics Interface: ISO 4401-03-02-0-05

Ordering Code

S6 Pro 1 2 3 4 5 6 7 8 9

Any value in range 19 to 60*

Rate flow in l/min for 35 bar ∆P per control edge

R – Suffix for reversal of A and B port e.g. 60R

* Flow rating set in valve software – dynamic performance measured set at 60lpm flow.

A	Axis cut (1% overlap linearized)
O	3% Overlap (linearized to 50% gain over center)
D	10% Overlap (with flow dead band)
X	For other options please enquire

A	± 10 V
B	± 20 mA
C	4 to 20 mA
D	± 5 V
X	For other options please enquire
	For differing input and output signals, use two letters, e.g. AC denotes ± 10V input and 4 to 20 mA output

C	Center
X	For other options please enquire

E	6 pin + PE circular connector*
E4	4 pin circular connector*
B4	4 contact, unterminated flying lead
G	G4-20P Rack and Panel connector
X	For other options please enquire

* EN 175201-804/MIL 5015 equivalent connector, shell size 14

Y	Enable mode on (Only available with connector option E)
N	No enable functionality

R	Recommended – any hydraulic oil in accordance with DIN 51524, filtered in accordance with ISO4406 18/16/13. Compatibility with water-free synthetic fluids available on enquiry.
X	For other options please enquire

N	Nitrile
V	Viton
X	For other options please enquire

Assigned individually to any with customized options upon enquiry

Variants on Request

Domin is proud of their ability to offer tailored solutions that meet customers’ specific needs. If you require a non-standard configuration, or a bespoke modification, we are confident we can provide you with the best solution. Talk to us here and one of our team will respond as soon as possible.

Domin is a supplier and servo valve manufacturer for various applications including die casting, injection molding, wood/timber machines, vibration equipment, metal processing, and simulation.