Hydraulic Servo Proportional Valves – P12 Pro

Compact Power. Proven Reliability.

The Domin P12 Pro the two-stage servo proportional valve using the P6 Pro as its pilot stage. The P12 Pro is designed to deliver industrial performance for NG16 systems where stable, repeatable control and predictable lifecycle cost are the priority.

The P12 Pro delivers required performance without the complexity of traditional servo valves, prioritising compact size, low mass, and robustness for continuous operation. Compatibility with standard NG16 interfaces enables easier commissioning, stable long-term behavior, and reduced maintenance in production systems.

The P12 Pro is designed to meet industrial performance requirements without the complexity associated with servo valves. Its design prioritizes compact size, lower mass, robustness for continuous operation, and compatibility with standard NG16 interfaces. This supports easier commissioning, stable long-term behavior, and reduced maintenance intervention in production systems.

Popular Upgrade Models:

Key Stats:

Key Features:

Standard Modification Options:

The P12 Pro is designed to be customized. Standard modifications include:

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)	< 7 (15.4)
Vibration Resistance	g	10
Shock Resistance	g	15
IP		IP65

Hydraulic Data

Max. Operating Pressure (P, A, B, X)	Bar (psi)	350 (5,000)
Max. Operating Pressure (Y, T)	Bar (psi)	250 (3,600)
Fluid		Hydraulic Oil DIN 51524-535
Fluid Temperature	ºC (ºF)	-20 to +60 (-4 to +140)
Viscosity	cSt	10 to 400
Rated Flow (35 Bar △P per edge)	l/min (US gal / min)	580 (153)
Flow Maximum	l/min (US gal / min)	1000 (264)
Pilot Leakage	l/min (US gal / min)	1.3 (0.34)
Main Stage Leakage	l/min (US gal / min)	1.2 (0.32)
Filtration		ISO 4406 (1999) 18/16/13

Static/Dynamic Data

Response Time at 100% Step Input	ms	< 12
Frequency Response (-3dB gain, ±25% signal)	Hz	> 60
Frequency Response (-90deg phase, ±25% signal)	Hz	> 60
Hysteresis	%	< 0.2
Threshold	%	< 0.1
Null Shift	%	< 1

Performance Graphs

View performance graphs for the P12 Pro Domin Servo Valve below including Step Response and Frequency Response:

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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.

4 Pin Circular Connector (E4)

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 signal, +
C	Input –	Differential input signal, –
D	Supply 0 V	0 V

* 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 50 mm DIN EN ISO 4762-8.8
Req.Torque: 40 Nm (29.5 ft-lbf)

Bolts (F5, F6)

Type: M6 x 50 mm DIN EN ISO 4762-8.8
Req.Torque: 8 Nm (5.9 ft-lbf)

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

Type: 22.22 x Ø 2.62
Material: NBR or Viton, 90 Shore A

O-Rings (L, X, Y)

Type: 10.82 x Ø 1.78
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 high duty industrial machines, production & processing equipment, energy & process systems, and large-scale industrial automation.