IMI STI RTQH Series User manual

Quarter turn hydraulic actuator
RTQH Series
Single acting version type RTQHS
INSTRUCTION MANUAL 5400

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS i
Date
Revision
Description
Compiled
Approved
06/02/2018
5
Revised § 5.1
M. Bozzarelli
F. Tondolo
06/12/2017
4
Revised §1.6 / added §7.3
M. Bozzarelli
F. Tondolo
15/02/2016
3
Revision
M. Bozzarelli
D. Lamoure
02/10/2015
2
Revision
M. Bozzarelli
D. Lamoure
24/10/2013
1
Revision
G. Alfieri
D. Lamoure
01/07/2013
0
Issue
E. Montagna
D. Lamoure
STI S.r.l has taken every care in collecting and verifying the documentation contained in this Instruction
Manual. The information herein contained are reserved property of STI S.r.l.

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS ii
INDEX
1GENERAL INFORMATION.............................................................................................................................1
1.1 GENERAL WARNINGS..................................................................................................................................1
1.2 GENERALITIES ...........................................................................................................................................1
1.3 MANUFACTURER ........................................................................................................................................1
1.4 TERMS AND CONDITIONS .............................................................................................................................1
1.5 MANUFACTURER’S LIABILITY ........................................................................................................................1
1.6 APPLICABLE STANDARDS AND DIRECTIVES .....................................................................................................2
1.7 SYMBOLOGY USED.....................................................................................................................................2
2DEVICE DESCRIPTION..................................................................................................................................3
2.1 GENERAL DESCRIPTION ..............................................................................................................................3
2.2 IDENTIFICATION OF THE MAIN PARTS .............................................................................................................4
2.3 ACTUATOR CODING DESCRIPTION..................................................................................................................5
3TECHNICAL DATA ........................................................................................................................................6
4IDENTIFICATION PLATE...............................................................................................................................6
5INSTALLATION..............................................................................................................................................7
5.1 TRANSPORT ..............................................................................................................................................7
5.2 RECEPTION...............................................................................................................................................8
5.3 STORAGE .................................................................................................................................................8
5.4 REQUIREMENTS OF STABILITY......................................................................................................................8
5.5 INTERFACE DOCUMENT AND DIMENSIONAL DRAWING.........................................................................................8
5.6 INSTALLATION............................................................................................................................................9
5.7 DISASSEMBLING....................................................................................................................................... 12
6OPERATION AND USE................................................................................................................................ 13
6.1 OPERATION DESCRIPTION..........................................................................................................................13
6.2 INTENDED USE.........................................................................................................................................13
6.3 REASONABLY FORESEEABLE MISUSE ...........................................................................................................13
6.4 OPERATING LIMITS ...................................................................................................................................14
6.5 RESIDUAL RISKS......................................................................................................................................14
7INSTRUCTIONS FOR THE OPERATOR.......................................................................................................15
7.1 START UP...............................................................................................................................................15
7.2 STROKE ADJUSTMENT...............................................................................................................................15
7.3 MANUAL OVERRIDE ..................................................................................................................................18
8MAINTENANCE ...........................................................................................................................................20
8.1 PERIODIC INSPECTIONS.............................................................................................................................20
8.2 SPECIAL MAINTENANCE .............................................................................................................................21
8.3 REPAIRS.................................................................................................................................................25
8.4 MECHANISM LUBRICATION .........................................................................................................................26
8.5 HYDRAULIC FLUID ....................................................................................................................................26
9TROUBLESHOOTING..................................................................................................................................27
10 PARTS LIST GENERAL ASSEMBLY .......................................................................................................28
11 SPARE PARTS ........................................................................................................................................34
12 DECOMMISSIONING................................................................................................................................35
13 DECLARATION OF INCORPORATION .................................................................................................... 36

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS iii

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 1
1 GENERAL INFORMATION
1.1 General Warnings
Important
This Instruction Manual is an integral part of the machine, it should be carefully
read before carrying out any operation and it should be kept for future references.
This Instruction Manual covers the RTQHS actuators in the base version without
any accessories and/or control panel.
In case accessories and/or control panel are foreseen mounted on the actuator an
additional Section to this Instruction Manual will be attached to the specific
actuator.
This Instruction Manual is realized in accordance with the Directive 2006/42/CE.
1.2 Generalities
STI S.r.l. actuators are conceived, manufactured and controlled according to the Quality Control System in
compliance with EN ISO 9001 International Standard.
STI S.r.l. Via Dei Caravaggi 15
24040 Levate (BG) Italy
Tel. [phone]
Fax [phone]
[e-mail]
1.3 Manufacturer
With respect to Machinery Directive 2006/42/EC the Manufacturer of the described RTQHS actuator series,
is STI S.r.l. as specified on the machinery label.
1.4 Terms and conditions
STI S.r.l. guarantees each single product to be free from defects and to conform to current goods
specifications. The warranty period is one year from the date of installation by the first user, or eighteen
months from the date of shipment to the first user, whichever occurs first.
The warranty does not cover special products or components not covered by warranty in their turn by
subcontractors. No warranty is given for products which have been subject to improper storage, improper
installation, misuse, or corrosion, or which have been modified or repaired by unauthorised personnel.
Repair work due to improper use will be charged at standard rates.
1.5 Manufacturer’s Liability
STI S.r.l. declines all liability in the event of:
- use of the actuator in contravention of local safety at work legislation
- incorrect installation, disregard or incorrect application of the instructions provided on the actuator
nameplate and in this manual
- modifications without STI’s authorisation
- work done on the unit by unqualified or unsuitable persons.

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 2
1.6 Applicable Standards and Directives
- EN ISO12100: 2010:Safety of machinery-General principles for design. Risk asses and risk reduction.
- IEC 61508-1/7 (Ed.2010)
- IEC 61511-1 (Ed. 2016)
- 2006/42/EC Machinery Directive.
- 2014/68/EU Pressure Equipments Directive (PED)
- 2014/35/EU Directive for Low Voltage Equipment (LV)**
- 2014/30/EU Directive relating to the Electromagnetic Compatibility (EMC)**
- 2014/34/EU Directive concerning equipment for use in potentially explosive atmospheres (ATEX)
** Applicable only when electrical control panel is supplied integrate with the actuator
1.7 Symbology Used
1.7.1 Signs of warning and/or danger
Please pay the maximum attention to the signs shown here below when they are present.
They indicate a potentially hazardous situation and they warn that, if the displayed indications are not
properly observed, the failure to observe them could cause serious injuries, death or long-term risks
to the health of exposed persons.
1.7.2 Sings of obbligation
General
obligation (with
the possible
supplementary
signboard)
Must wear
protective
clothing.
Obligation to
wear
protective
footwear.
Is required to
wear a helmet.
Is required to
protect the
eyes.
Obligation to
protect your
hearing.
GENERAL DANGER
DANGER POWER SUPPLY
CRUSHING HAZARD

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 3
2 DEVICE DESCRIPTION
2.1 General Description
RTQHS single acting hydraulic actuators, are suitable for the operation of quarter turn valves (ball valves,
butterfly valves, plug valves,...) for ON-OFF and modulating heavy-duty services.
The actuator is made up of a weatherproof scotch yoke mechanism transforming the linear movement of the
hydraulic cylinder (on closing or opening direction) or the linear movement due to the force of a spring (on
opposite direction to the hydraulic cylinder) into the rotary movement, which is necessary for valve
operation.
The travel stroke of the yoke is adjustable between ± 4 degree at both ends of the nominal travel by means
of the external mechanical stops arranged into the end flange of the spring cartridge and into the end flange
of the hydraulic cylinder.
The cover of the centerbody of the scotch yoke mechanism is machined to provide the assembly pattern for
any required accessories (i.e. positioner, signalling limit switches, position transducer, etc.) by means of
proper matching units. The above mentioned accessories are operated by the actuator drive sleeve.
Actuator centerbody bottom wall is machined with threaded holes to allow actuator mounting on top of valve
top-work either directly or, when required, with the interposition of an adaptor flange or a mounting bracket.

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 4
2.2 Identification of the Main Parts
The RTQHS actuator is composed by six main parts identified in the attached Fig. 1:
1) Scotch yoke mechanism.
2) Hydraulic cylinder
3) Spring cartridge
4) Stopper screw assembly for cylinder
5) Seal kit
6) Position Indicator
7) Stopper screw assembly for spring cartridge.
Fig. 1: Main parts for RTQHS actuator series (Spring to Close configuration)

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 5
2.3 Actuator coding description
- - - -
V
M
01 05
02 06
03 07
04 08
Y
S
C
C
60 200
75 235
100 280
135 300
160
R
A E
B F
C G
D H
S
1
2
3
4
A
CL
OP
H
HW
HWR
HP
RTQHS
Model 02
Manual handwheel
Y
-
S
Spring size
Version
Model 05
Model 06
Model 07
Model 08
Diameter = 235 mm
Diameter = 280 mm
Spring pack model
Diameter = 100 mm
Diameter = 135 mm
Diameter = 160 mm
Diameter = 300 mm
Diameter = 75 mm
R
C
Diameter = 200 mm
Single acting
Canted
Symmetric
V
Model
Model 03
Model 04
Yoke type
M
Model 01
Cylinder diameter
Diameter = 60 mm
Model 04
Model 05
Model 06
Model 07
Model 08
Manual handwheel with reduction
Accessories
Hydraulic hand pump
H
Fail action
Fail Close
Fail Open
Spring Size 2
Spring Size 1
Spring Size 3
Spring Size 4
A
Model 01
Model 02
Model 03

_____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5400, rev. 05 02/2018 –RTQHS 6
3 TECHNICAL DATA
DATA
Supply medium
Hydraulic fluid (see Section 8.5)
Operating temperature ranges
Standard : -30°C +100°C
Optional : -60°C +100°C (*)
(*) for SIL applications T° amb. min ≥ -40°C
PED applications:
Standard : -20°C +100°C
Optional : -50°C +100°C (*)
(*) for SIL applications T° amb. min ≥ -40°C
Cylinder design pressures
103, 207 or 345 bar
Operating pressure range
Depending on customer requirements and
specifications.
(Data are available on actuator nameplate)
Max operating torque (MOT)
RTQHS 01 models: up to 12.000 Nm
RTQHS 02 models: up to 22.000 Nm
RTQHS 03 models: up to 40.000 Nm
RTQHS 04 models: up to 70.000 Nm
RTQHS 05 models: up to 125.000 Nm
RTQHS 06 models: up to 220.000 Nm
RTQHS 07 models: up to 350.000 Nm
RTQHS 08 models: up to 500.000 Nm
Applications
On-Off
Modulating service (on request)
The nameplate fastened on the actuator contains the main actuator operating condition.
It is forbidden to modify the information and the marks without previous written authorization by STI S.r.l.
4 IDENTIFICATION PLATE