HYDRAULIC SERVO VALVES – S12 PRO

Hydraulic Servo Valves – S12 Pro

Compact Power. Proven Reliability.

The Domin S12 Pro is the next evolution in high-performance, high-flow hydraulic valves. It builds on the proven reliability of the S6 Pro, which is now used as the first stage for the most advanced two-stage valve in the world.

The S12 Pro delivers unmatched performance with the same trusted dependability. Combining high flow, excellent dynamics, proven reliability, and low power consumption, the S12 Pro sets a new benchmark in demanding applications.

With dimensions of 13.25 in (377 mm) in length and 6.9 in (177 mm) in height, the S12 Pro is thoughtfully designed with all components fully enclosed, eliminating exposed wires or sensors. This user-focused design element ensures not only a clean, sleek appearance, but also easier handling and installation.

This combination of performance and compact design makes the S12 Pro ideal for applications in industrial manufacturing, test simulation, and the energy sector.

Key Stats:

Key Features:

Standard Modification Options:

Technical Data:

General Data

Design		Two-Staged Servo Valve
Actuation		Direct Drive Pilot
Size		NG16
Mounting Interface		ISO 4401-07-07
Ambient Temperature	ºC (ºF)	-20 to +60 (-4 to +140)
Mass	kg (lb)	9 (20)

Hydraulic Data

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 (5 Bar △P per edge)	l/min (US gal / min)	250 (66)
Rated Flow (35 Bar △P per edge)	l/min (US gal / min)	660 (174)
Pilot Leakage	l/min (US gal / min)	<0.3 (0.08)
Main Stage Leakage	l/min (US gal / min)	<2.7 (0.7)
Filtration		ISO 4406 (1999) 18/16/13

Static/Dynamic Data

Response Time at 100% Step Input	ms	<10
Frequency Response (-3dB gain, ±25% signal)	Hz	>70
Frequency Response (-90deg phase, ±25% signal)	Hz	>100
Hysteresis	%	<0.2
Threshold	%	<0.1
Null Shift	%	<1

Performance Graphs

View performance graphs for the S12 Pro Domin Servo Valve below including Step Response, Flow vs Command, Frequency Response, and Pressure Gain:

Electronics Data

Normal Operating Conditions		Min.	Typ.	Max.
Supply Voltage	V	22	24	30
Absolute maximum current draws	A	–	–	4.5

±10 V

Normal Operating Conditions*		Min.	Typ.	Max.
Supply Voltage	V	-10	–	10
Output Signal**	V	-10	–	10

* Operation of the product outside of the nominal operation 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.

±20 mA

Normal Operating Conditions		Min.	Typ.	Max.
Supply Voltage	mA	20	–	20
Output Signal	mA	20	–	20

+4 to +20 mA

Normal Operating Conditions		Min.	Typ.	Max.
Differential Input Signal	mA	4	–	20
Differential Input Signal for drive off	mA	-20	–	2

Electronic Interface Diagrams

6 + PE Circular Connector (Code E)

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.

Unit Dimensions + Mounting Dimensions

Unit Dimensions

Nominal dimensions are displayed in mm. Bracketed dimensions are in inches. Not to scale.

Mounting Surface Pattern

	Dia Ø mm	X Position mm	Y Position mm
P	20	50	14.3
A	20	34.1	55.6
B	20	65.9	55.6
T	20	18.3	14.3
L	6.3	0	34.9
X	6.3	76.6	15.9
Y	6.3	88.1	57.2
F1	M10	0	0
F2	M10	101.6	0
F3	M10	101.6	69.9
F4	M10	0	69.9
F5	M6	34.1	-1.6
F6	M6	50	71.5

* Valves includes seal grooves for X and Y ports for installation in existing systems X and Y connections are NOT required for valve operation.

Bolts (F1, F2, F3, F4)

Type: M10 x 60 DIN ISO 912-12.9
Req.Torque: 65 Nm (47.95 ft-lbf)

Bolts (F5, F6)

Type: M6 x 60 DIN ISO 912-12.9
Req.Torque: 13 Nm (9.59 ft-lbf)

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

Type: 21.89 x Ø 2.62 (ISO 3601)
Material: NBR or Viton, 90 Shore A

O-Rings (L, X, Y)

Type: 10.32 x Ø 1.78 (ISO 3601)
Material: NBR or Viton, 90 Shore A

Standards Reference

EMC Regulations: Immunity: EN 61000-6-2, Emission: EN61000-6-3
Performance Tests: ISO 10770-1
Pressure Rating: ISO 10771
Hydraulics Interface: ISO 4401-07-07*

* Ports over-sized to Ø 20 mm.

Domin is a supplier and servo valve manufacturer for various applications including blow/injection molding, wood/timber machines, simulation, gas, steam, & hydro turbines, hydraulic presses, and vibration equipment.