HYDRAULIC SERVO VALVES – S4 PRO

Hydraulic Servo Valves – S4 Pro

As the smallest direct drive valve in the world, the S4 Pro is a true game-changer. With its miniature port circle of 0.48 in (12.2 mm) and weight of less than 0.65lbs (300g), it’s perfectly suited for applications where space is limited but performance is paramount.

From demanding industrial settings to cutting-edge robotics and motorsport applications, the S4 Pro excels. Delivering superior performance, dynamics, and reliability in an ultra-compact package, it introduces a new era of control and productivity with the Domin S4 Pro series.

Available on S01 port pattern as standard.

Key Specs:

Key Features:

Standard Modification Options:

Technical Data

General Data

Design		Direct Drive Servo Valve
Actuation		Rotary-Rotary
Size		Miniature
Mounting Interface		ISO 10372-01-01
Ambient Temperature	ºC (ºF)	-20 to +60 (-4 to +140)
Mass	kg (lb)	0.29 (0.64)
Vibration Resistance	g	35, 3 axes
Shock Resistance	g	50

Hydraulic Data

Max. Operating Pressure (P, A, B, T)	Bar (psi)	350 (5,000)
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)	0.5 to 6 (0.2 to 1.6) / 6 to 11 (1.6 to 2.9) / 11 to 18 (2.9 to 4.8)
Flow Maximum	l/min (US gal / min)	1.4 to 12 (0.4 to 3.2) / 12 to 22 (3.2 to 5.8) / 22 to 36 (5.8 to 9.6)
Leakage at 100 bar	l/min (US gal / min)	<0.2 (0.05) / <0.45 (0.12) / <0.45 (0.12)
Filtration		ISO 4406 (1999) 18/16/13

Static/Dynamic Data

Response Time at 100% Step Input	ms	<3
Frequency Response (-3dB gain, ±25% signal)	Hz	>200
Frequency Response (-90deg phase, ±25% signal)	Hz	>110
Hysteresis	%	<1
Threshold	%	<1
Null Shift	%	<1

Performance Graphs

View performance graphs for the S4 Pro Domin Servo Valve below including Step Response, Flow vs Command, Frequency Response, and Pressure Gain:

Domin is a supplier and servo valve manufacturer for various applications including automotive/motorsports, aerospace, animatronics, simulation, robotics, and marine.