failsafe springpowered failsafe

PRODUCT SPECIFICATION 

GENERAL DESCRIPTION 

Rotork Skilmatic SI intelligent actuators offer a unique 

combination of the renowned features of Rotork actuation, 

such as the double sealing system and non-intrusive 

infrared commissioning capability, with the benefits of control 

and safety from Skilmatic range. 

SI-1-Q 

ELECTRIC QUARTER TURN 

ACTUATOR 

The SI-1-Q are compact and robust electrically operated failsafe 

spring return quarter turn actuators. The actuators are 

designed to provide a 90-degree travel for two-position, ESD 

or modulating applications. The actuators are suitable for all 

types of ¼ turn valves and are supplied with a mounting 

flange to ISO 5211 

The SI-1-Q is watertight and dustight to IP68 / NEMA6 with 

the Rotork double seal system with separated termination 

and cable gland compartment. The actuators are also 

available certified explosionproof for hazardous area 

applications. 

Consisting of a self-contained Electro-hydraulic control 

module and Scotch yoke spring return drive. The actuators 

combine the simplicity of electrical operation, with the 

precision of hydraulic control, and reliability of springpowered 

fail-safe action. The spring return mechanism 

provides the most reliable means of positioning a valve to 

the safe condition and can be provided as fail-safe close, 

open or lock in last position on power or signal failure. The 

actuators are available as spring return clockwise or 

anticlockwise, with end of spring torque from 70Nm 

(620inlbs) to 472 Nm (4177 inlbs) 

The actuators can be programmed with the infrared setting 

tool to accept an analogue or digital input, with ESD and 

partial stroking or network cards options. A wide range of 

functions can also be set through the setting tool such as 

zero & span limits, deadband, hysteresis, slow band, and 

partial stroke position. Optional internal fieldbus 

communication boards are also available for the Rotork 

Pakscan, DeviceNet, Profibus, Foundation fieldbus and 

Modbus digital control systems. 

Specifically designed for on/off duties particularly where failsafe 

ESD action is required, lockable local controls are 

provided as standard and on safety critical applications the 

local selection can be overridden depending on the actuator 

configuration. Electro-mechanical ends of stroke limit 

switches are offered for safety critical applications 

Operating from a standard single phase, three phase or 

24Vdc supply the actuators are also ideal for modulating 

control applications, the Control module provides a pulsed 

hydraulic signal to accurately position the spring-opposed 

cylinder. Resulting in accurately positioning a valve with a 

resolution better than 0.2 of a degree. 

Manual override gearbox is available on all sizes. 

FEATURES 

• Self-contained electrically operated with internal low 

pressure Electro hydraulic control module. 

• Spring return, Fail - Safe or lock in position 

• Dual redundant hydraulic oscillating pumps. 

• Single phase, Three phase and dc power supply 

• Non- Intrusive commissioning and configuration 

• Local LCD display – for position indication, internal 

pressure and fault diagnostics. 

• Local controls - Lockable Local/ Stop/ Remote selector 

switch with local Open / Closed switch. 

• Modulating control - 4- 20 mA input & output with a 

resolution < 0.2 Deg. 

• Digital Control – ESD and partial stroking capabilities. 

• Output relays for Monitoring / Fault alarms and Open / 

Closed limits 

• Optional Fieldbus communications 

• Watertight & Explosionproof 

• Double sealed – with separate terminal compartment.

SI-1-Q DIMENSION & MOUNTING DETAILS 

334 

394 

A 

B C 

436 

178 

G 

OE 

226 

D 

GEARBOX OPTIONAL 

F 

Dimensions 

Actuator Code 

SI-1-Q31 / 

SI-1-QA31 

SI- 1-Q41 

SI- 1-QA41 

SI-1-Q51 

SI-1-QA51 

SI-1-Q60 

SI-1-QA60 

SI-1-Q61 

SI-1-QA61 

A 374 374 394 394 394 

B 65 200 90 285 285 

C 200 200 285 285 285 

D 269 269 292 292 292 

ØE 400 400 400 600 600 

F 272 272 292 312 312 

G 119 119 131 131 131 

L 17 22 22 27 27 

M 30 30 30 37 37 

P 22.2 28.2 28.2 36.2 36.2 

ØV 70 70 102 102 102 

ØV1 102 102 125 125 125 

W M8x14 M8x14 M10x17 M10x17 M10x17 

W1 M10x17 M10x17 M12x21 M12x21 M12x21 

Weight (Kg) 

Weight With 

Gearbox (Kg) 

Note: - All 3-Phase actuators will have an extended Control Module. Dimension 436 mm will change to 491 mm 

OV 

+0.13 

-0.00 

x M DEEP 

OV1 

L P +0.5 

- 0.0 

Flange & Square Drive Details 

to ISO 5211 

Page 2 of 4

KEY MODEL CODE 

SI-1-Q50 - 0 0 2 1 - 0 0 0 - A - A 

Table 1 - Failure Mode 

Table 2 - Return speed options 

Table 3 - Supply voltage 

Table 4 - Control option 

Table 5 – Certification 

Table 6 - Cable entries 

Table 7 - Hydraulic fluid 

Table 8 – Mounting 

Table 9 - Accessories 

KEY MODEL CODE – ACTUATOR SIZE 

Code Torque Nm (Inlbs) Stroke speed (Seconds) 

Spring Return Hydraulic stroke Spring return 

clockwise 

Anticlockwise 

Start Mid Finish Start Mid Finish 

Hydrauli 

c 

Stroke 

Speed 

Spring Return Speed 

(See table 2) 

Std 

Single 

Std 

Dual 

ESD 

SI-1-Q31 SI-1-QA31 108 (956) 42 (372) 56 (495) 101 (894) 50 (442) 70 (620) 15 5 3 1.5 

SI-1-Q41 SI-1-QA41 221 (1956) 86 (761) 115 (1018) 206 (1823) 102 (903) 143 (1265) 30 9 5 2 

SI-1-Q51 SI-1-QA51 324 (2867) 125 (1106) 166 (1469) 330 (2920) 164 (1451) 233 (2062) 50 18 10 4 

SI-1-Q60 SI-1-QA60 580 (5133) 250 (2212) 310 (2743) 490 (4336) 240 (2124) 333 (2947) 100 33 18 6 

SI-1-Q61 SI-1-QA61 658 (5823) 252 (2230) 337 (2982) 671 (5938) 334 (2956) 472 (4177) 100 33 18 6 

TABLE 1 - FAILURE MODE 

CODE DESCRIPTION 

0 Fail- Safe (to release pressure) 

1 Fail in Position (lock pressure) 

2 Fail- Safe without pressure monitoring 

3 Fail in Position without pressure monitoring 

TABLE 2 – SPRING RETURN SPEED 


0 Standard single internal solenoid. 

1 Std single internal solenoid & ESD 

2 Std dual internal solenoid 

3 Std dual internal solenoid & ESD 

4 Slow acting single internal solenoid 

TABLE 3 - SUPPLY VOLTAGE 


0 Single phase 110V ac 50/60 Hz ± 10% 



3 Three phase 380V ac 50/60 Hz ± 10% 





8 

9 24V dc 

TABLE 4 - CONTROL 

CODE 

DESCRIPTION 

0 Digital control 

1 Analogue controls 

2 Pakscan 

3 Pakscan- analogue input 

4 Modbus single channel 

5 Modbus dual channel 

6 Profibus dual channel 

7 DeviceNet 

8 Foundation fieldbus 

9 Profibus single channel 

TABLE 5 –CERTIFICATIONS 


0 WT – Watertight IP68 

1 ATEX ( European – Hazardous area) 

2 IEC (International – Hazardous area) 

3 FM ( US – Hazardous area) 

4 CSA ( Canada- Hazardous area) 

TABLE 6 – CABLE ENTRIES 


0 M20 x 1.5P 

1 ½” NPT 

TABLE 7 – HYDRAULIC FLUID 


0 Std 10 cSt mineral fluid 

1 20 cSt silicone fluid (low temperature –15 to -35 o C) 

2 15 cSt bio-degradable fluid 

TABLE 8 - MOUNTING 

CODE 

A 

B 

C 

DESCRIPTION 

Vertical stem above valve 

Vertical stem below-valve 

Valve stem horizontal 

TABLE 9 – ACCESSORIES 

CODE 

A 

B 

DESCRIPTION 

None 

Manual override 

NOTE: 

Stroke speed is typical for all actuators with no load at 20 o C ±10% 

Non standard torque’s are available on requests. 

All actuators are available with 4-20 or 20-4mA output, powered 

internally by an isolated 24Vdc supply or external customer supply. 

Page 3 of 4

SPECIFICATION 

Certification 

ATEX II 2G Eex dm IIB T3 (T amb -35° to +60°C) Approval Pending 

(See operating temperature). 

FM Class I, Zone1 AEx dm IIB T3 (Ta -35 o C to +60 o C) Approval 

Pending 

CSA - Approval Pending 

IEC - Approval Pending 

(See operating temperature) 

Safety Integrity: - Designed to SIL 2 

Enclosure: Watertight to IP68 / NEMA 6, double sealed protection 

with separate cable gland and termination compartment. 

Materials 

Control Module: Aluminium (BS 1490 Grade LM25 

Actuator Body: Anodised Aluminium 

Actuator Springs: Corrosion protected spring steel 

Switchbox: Aluminium (GaiSi 10Mg Din 1725/2). 

Mounting Bracket: Steel. 

Piping: 

316 Stainless Steel (hard piped). 

Paint Finish: Standard 2 Pack Epoxy silver grey (150microns 

thick). 

Mechanical 

Operating 

Temperature: 

Standard –20°C to +60°C (-4°F to 140°F). 

Optional –40°C to +60°C (-40°F to 140°F) 

(See table 7 Hydraulic fluid). 

Torque / Speed: See Key code table (page 3). 

Stroke: 0° to 92°, adjustable between 80° and 92 

Weight: See dimensional detail (page 2). 

Failure Mode: 

Action: 

Hydraulic Fluid: 

Fail-safe in the direction of the spring or 

Fail in last position. 

Spring return clockwise or anti-clockwise Code (A). 

Standard 10c.st mineral oil optional 

20c.st silicone oil or 15c.st bio-degradable oil 

Maximum Working Pressure: - 12 bar. (174lbf/in 2 ) 

Pump Output: 17cc/sec at 5.5 bar at 50Hz. 

Manual Override: Optional gearbox 

Internal pressure transmitter: - 0-16Bar.Display indicate in 10psi 

increments. 

Mounting: Vertical or horizontals (see table 8) 

Electrical 

Electrical Supply: Single phase, 3-phase and 24vdc see table 3 

Supply Tolerance: Supply voltage ± 10%, frequency 50/60 Hz ±5% 

Power Consumption: 230Vac - 305VA(156watts), 110Vac 374VA 

(190 watts) reducing to 15VA(6watts) in balanced 

state. ESD option add 23VA (10.5watts) 

3- phase consult factory 

Pump coil protection: Cutout +110 o C (230 o F) 

Thermal fuse +130 o C (266 o F) 

Cable Entries: Four entries threaded M20 x 1.5P or ½” NPT. 

Position Feedback: 1K ohm. Conductive Plastic. 

Remote Digital inputs:-Open, Close, maintain,ESD and Partial 

Stroke – 24Vdc or 110vac 5mA minimum 

duration 300ms. 

Limit Switches: Two Electro mechanical SPDT volt free 

switches. Rating 5A) minimum at 230Vac 

(Table 9 accessories). 

Local controls: Lockable Local/ Stop/ Remote selector switch 

and local Open / Closed switch. Totally sealed 

with internal reed switches 

Non-intrusive setting: - 

Sealed control module with infrared setting from the 

Rotork standard Setting Tool. All values are held within 

EEPROM to maintain settings within the memory on 

power failure. 

Display: - 

Rotork LCD display with large segments to allow viewing 

of the valve position, internal pressure and diagnostics 

screens. 

LED’s are provided to indicate limits and intermediate 

state in the remote mode. 

Function Settings: - Deadband, Hysteresis and Partial stroking 

adjustable 0 to 9.9% 

Control 

Control Options: Digital ( Two position),.Emergency shutdown and 

Partial stroking 

Modulating, - input/output 4-20mA or 0-10Vdc. 

Output:- 4-20 or 20-4mA, powered internally by an isolated 

24Vdc supply or external customer supply. 

Resolution: 

Repeatability:

failsafe springpowered failsafe

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