STI SC/Vo User manual

SC/Vo - METERING PUMP
ACTUATOR
INSTRUCTION MANUAL 5009

____________________________________________________________________________________
STI S.r.l. –Via Dei Caravaggi 15, 24040 Levate (BG) –ITALY www.imi-critical.com
Manual 5009, rev. 01 09/2019 –SC/Vo
i
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.

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Manual 5009, rev. 01 09/2019 –SC/Vo
ii
INDEX
1GENERAL INFORMATION...............................................................................................................1
1.1 GENERALITIES .............................................................................................................................1
1.2 MANUFACTURER ..........................................................................................................................1
1.3 TERMS AND CONDITIONS...............................................................................................................1
1.4 MANUFACTURER’S LIABILITY..........................................................................................................1
1.5 APPLICABLE STANDARDS AND DIRECTIVES......................................................................................2
1.6 SYMBOLOGY USED .......................................................................................................................2
2DEVICE DESCRIPTION ...................................................................................................................3
3TECHNICAL DATA ..........................................................................................................................4
4LABEL .............................................................................................................................................5
5OPERATING CONDITIONS AND INTENDED USE ..........................................................................6
5.1 OPERATING CONDITIONS...............................................................................................................6
5.2 INTENDED USE .............................................................................................................................6
6TRANSPORT ...................................................................................................................................7
7RECEPTION.....................................................................................................................................7
8STORAGE........................................................................................................................................7
9INSTALLATION................................................................................................................................8
9.1 CHECKS TO BE PERFORMED BEFORE INSTALLATION..........................................................................8
9.2 PNEUMATIC CONNECTIONS............................................................................................................8
9.3 EARTHLING CONNECTION ..............................................................................................................9
9.4 OIL CHARGE ................................................................................................................................9
10 INSTRUCTION FOR THE OPERATORS.....................................................................................10
10.1 FIELD ACTIVITIES........................................................................................................................10
10.2 RESIDUAL RISKS........................................................................................................................10
11 MAINTENANCE..........................................................................................................................11
11.1 PERIODIC INSPECTIONS AND MAINTENANCE...................................................................................11
11.2 EXTRAORDINARY MAINTENANCE...................................................................................................11
11.3 GREASES..................................................................................................................................12
11.4 GASKETS REPLACEMENT.............................................................................................................13
12 PARTS LIST GENERAL ASSEMBLY.........................................................................................15
13 TROUBLESHOOTING................................................................................................................20
14 SPARE PARTS...........................................................................................................................20
15 DISASSEMBLING.......................................................................................................................21
16 DECOMMISSIONING..................................................................................................................21

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 1 -
1 GENERAL INFORMATION
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.
The operators shall adopt the safety precautions required by the country where
the product is installed.
This Instruction Manual is realized in accordance with the Directive 2006/42/CE.
1.1 Generalities
STI S.r.l. actuators are conceived, manufactured and controlled according to the Quality management
System in compliance with EN ISO 9001 International Standard.
1.2 Manufacturer
With respect to Machinery Directive 2006/42/EC, the Manufacturer of the described SC/Vo actuator is STI
S.r.l. as specified on the label.
STI S.r.l. Via Dei Caravaggi 15
24040 Levate (BG) Italy
Tel. [phone]
Fax [phone]
[e-mail]
1.3 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 two years from the date of shipment to the first user. 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, improper
maintenance or which have been modified or repaired by unauthorised personnel.
1.4 Manufacturer’s liability
The SC/Vo actuator is designed in accordance with the applicable International Rules and Specifications,
but the following regulations must be observed in any case:
- the general and safety regulations;
- the plant specific regulations and requirements;
- the proper use of personal devices, protective devices (glasses, clothing, gloves, etc), tools and
transport equipment.
STI S.r.l. declines all liability in the event of:
- use SC/Vo actuator in other applications than the designated ones;
- use of the SC/Vo actuator in contravention of local safety at work legislation;
- lack of care during transport, installation, operations, maintenances of the SC/Vo actuator or incorrect
application of the instructions provided on the SC/Vo actuator label and in this manual;
- modifications or repairs without STI S.r.l. authorisation;
- work done on the unit by unqualified or unsuitable operators.

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Manual 5009, rev. 01 09/2019 –SC/Vo
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Considering that STI S.r.l. has no direct control over particular applications, operation or maintenance
conditions, it is the operator’s responsibility to comply with all applicable safety rules; it is the sole
responsibility of the operator to ensure that the local health and safety regulationsare adhered to. Depending
on the specific working conditions, additional precautions may be requested.
Please inform STI S.r.l. urgently if you face unsafe situations not described in this Instruction Manual.
1.5 Applicable Standards and Directives
EN ISO 12100:2010
Safety of machinery - General principles for design –Risk assessment and risk
reduction
IEC 61508:2010
Functional safety of electrical / electronic / programmable electronic safety-related
systems
2006/42/EC
Machinery Directive
97/23/EC
Pressure Equipments Directive (PED)
94/9/CE
Equipments used in potentially explosive atmospheres (ATEX)
1.6 Symbology used
Dangerous symbols: be careful where these symbols are shown, they indicate a potentially hazardous
situation and they warn that if the steps are not properly performed, may result causing serious injury, death
or long-term risks to the health of exposed persons.
GENERAL DANGER
DANGER POWER SUPPLY
CRUSHING HAZARD
Obligation symbols: if these symbols are shown, the corresponding direction shall be followed.
General
obligation (with
the possible
supplementary
signboard)
Must wear
protective
clothing.
Must wear
protective
footwear.
Must wear
protective
helmet.
Must wear
protective
glasses
Must wear
earplugs

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Manual 5009, rev. 01 09/2019 –SC/Vo
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2 DEVICE DESCRIPTION
The SC/Vo actuator is made by three main parts:
- pneumatic cylinder with double-acting piston, a part of which is full of oil;
- oil tank, which permits to have cylinder part always full of oil also when the piston is at the dead centre;
- the manual override (if required).
Different kind of pneumatic accessories could be mounting on the SC/Vo actuator depending on the
performance required.
Figure 1 –SC/Vo metering pump actuator

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Manual 5009, rev. 01 09/2019 –SC/Vo
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3 TECHNICAL DATA
Model
Double Acting
Casting Actuators
Cylinder material
Aluminum
Size (cylinder diameter) / Stroke
150mm / ≤40mm
200mm / ≤67mm - ≤100mm
Standard design pressure (*)
10bar
Standard operating temperature range (**)
-20°C/+70°C
Expected lifetime
20 years
(*) For some special application the design pressure is 12 bar.
(**) For some special application the operating temperature range could be another one included in the
extended temperature range from -40°C to 100°C.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 5 -
4 LABEL
Every SC/Vo actuator is provided with a label contains the main operating conditions and serial number. The
label may change if the SC/Vo actuatoris sold with reference to a Certificate of product and/or system issued
by Notified Body Exterior or Certificate of Conformity issued by STI S.r.l..
Figure 2 –SC/Vo standard label
Important
It is forbidden to modify the information and the marks without previous written
authorization by STI S.r.l..
Do not remove the label and/or replace with another label.
Warning
It is severely forbidden to use the SC/Vo actuator under conditions other than
those provided on the label.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 6 -
5 OPERATING CONDITIONS AND INTENDED USE
5.1 Operating conditions
The label fastened on the SC/Vo actuator contains the main operating conditionsfor the specified application
(see Section 4). Other operating conditions are reported on the documents accompanying the actuator. For
general operating conditions see Section 3.
5.2 Intended use
The SC/Vo actuator series has been specifically designed for metering pumps. In order to open/close the
pump without the support of the supply fluid, in some application the manual override is required. Every
manual override is provided with a label contains the correct using steps.
Figure 3 –Manual override standard label
After the manual override using, take off the manual override pin and then check the correct behavior of the
SC/Vo actuator with a functional test or a visual check of the pin.
Warning
It is severely forbidden to use the SC/Vo actuator for purpose or application other
than those for which it was designed and here specified.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 7 -
6 TRANSPORT
Warning
The following instructions must be respected:
- operations must be carried out only by skilled operators;
- always wear protective clothing, gloves, and eyewear to prevent personal
injury. Check with your process or safety engineer for any additional
measures that must be taken to protect against process media.
Important
The lifting and handling should be made in compliance with the laws and
provisions in force.
Lift theSC/Vo actuator with belts, usingits eyebolts. Make surethat thebeltsnever scratchesthe accessories
and pneumatic/electric connection.
7 RECEPTION
SC/V actuator leave the factory in perfect condition. Performances of each unit are guaranteed by tests and
data reported on a specific Test Report. At the reception of the SC/V actuator:
- check that the model correspond with that of order confirmation;
- check that the pneumatic diagrams, wiring diagrams and dimensional drawing are furnished with
document accompanying the actuator;
- check that the SC/Vo actuator was not damaged during transportation. If necessary, renovate the
painting according to the specification reported on the order confirmation.
8 STORAGE
In orderto maintain the guaranteed actuator performances until the SC/Vo actuator isinstalledon site, proper
attention must be observed for preservation during the storage period. If the SC/Vo actuator needs storage
before installation:
- placeit in adry, clean placeandtake all necessary measures to avoidcontactwithdust, dirtand humidity
during storage;
- make sure that connection protections and/or the mechanical locks will not be removed during the
storage;
- storage temperature must be between -20°C and +40°C.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 8 -
9 INSTALLATION
Warning
The following instructions must be respected:
- operations must be carried out only by skilled operators;
- always wear protective clothing, gloves, and eyewear to prevent personal
injury. Check with your process or safety engineer for any additional
measures that must be taken to protect against process media.
Important
Not performing the following procedures will invalidate the product warranty.
9.1 Checks to be performed before installation
It is recommended to check the SC/Vo actuator conditions before the installation, then:
- prepare the necessary tools for the assembly and setting of the unit;
- check that the coupling dimensions meet the specified coupling dimensions;
- clean the SC/Vo actuator surfaces and remove anything that might prevent a perfect adherence.
Warning
Do not lift the pump with the SC/Vo actuator eyebolts.
9.2 Pneumatic connections
Warning
Check that the values of pneumatic supply available are compatible with those
reported on the label of the SC/Vo actuator: a pressure regulator is absolutely
necessary when supply pressure is higher than max operating pressure.
User must consider and take all precautions to avoid that pressurized parts are
not used out of specified range and to avoid exposure to fire.
Important
For easier maintenance, it is recommended to install a filter with five micron
cartridge and shut-off valve on the supply connection.
It is required to follow these steps during the pneumatic connection:
- no lubricators on supply fluid line is required;
- use pipes and connections appropriate as for type, rating, material and dimensions;
- properly deburr the ends of rigid pipes;
- properly clean the interior of pipes sending through them plenty of the supply fluid;
- use pipe sealant sparingly and only on male threads. A non-hardening sealant is strongly recommended;
- fasten the connection pipes so that no irregular strains or loosening of threaded connections occur;

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 9 -
- make the pneumatic connections according to the pneumatic diagram;
- check the absence of leakages from pneumatic connections. If necessary, tighten the nuts of the pipe-
fittings;
- after connecting the actuator, gradually increase the supply pressure up to the maximum operating
pressure.
9.3 Earthling connection
Warning
Check if the SC/Vo actuator has a properly earthling connection.
The earthling connection is guaranteed trough the fixing flange of the SC/Vo actuator. If the earthling
connection of the system where SC/Vo actuator is mounted is not guaranteed, it is required to ensure a
directly earthling connection.
9.4 Oil charge
The first oil charge must be effected as follows:
1. remove the oil reservoir from the actuator taking off the fixing screw;
2. effect the filling with ESSO NUTO oil (heated at 50°C) making slow alternated piston movements in
order to bleed the air. Filling is completed when the piston is at the lower dead centre and the upper
cylinder chamber is completely full of oil.
3. Reassemble oil tank and pour the oil through the cap until the maximum level shown on level rod is
reached.
4. Connect pneumatic connections and after having checked the seals, put actuator in service,
performing some alternated strokes with slow movements in order to bleed the cylinder.

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Manual 5009, rev. 01 09/2019 –SC/Vo
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10 INSTRUCTION FOR THE OPERATORS
Warning
The following instructions must be respected:
- operations must be carried out only by skilled operators;
- always wear protective clothing, gloves, and eyewear to prevent personal
injury. Check with your process or safety engineer for any additional
measures that must be taken to protect against process media.
Important
Any repair work other than the operations outlines in this Instruction Manual is
allowed only if STI S.r.l. authorises it.
10.1 Field activities
During the start-up of the SC/Vo actuator:
-check that the pressure and quality of the supply fluid (filtering degree, dehydration, etcetera) are as
prescribed;
-check if the operating condition are as prescribed;
-check if the actuator is perfectly aligned with the pump stem;
-check that there are no leaks of the pneumatic connections;
-check that there are no leaks of the accessories mounted on the SC/Vo actuator;
-check that there are no leaks of the cylinder of SC/Vo actuator;
-remove all rust on the SC/Vo actuator surfaces;
-repair paint-coat that has been damaged, in accordance with the applicable painting specifications;
-perform a complete functional test.
10.2 Residual Risks
Reasonably foreseeable misuse:
- risk due to movements of loads during transport and installation;
- crushing during transport and installation;
- installation in ambient with not planned conditions;
- metal temperature at high or very low values as consequence of ambient temperature as to be
considered as a risk of person injury in case of contact;
- insert incorrect motive fluid into the system;
- supply pressure out of planned range;
- emissions of hazardous substances where dangerous gases are used as motive fluid.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 11 -
11 MAINTENANCE
Warning
The following instructions must be respected:
- operations must be carried out only by skilled operators (STI operators or
operators qualified by STI are recommended);
- always wear protective clothing, gloves, and eyewear to prevent personal
injury. Check with your process or safety engineer for any additional
measures that must be taken to protect against process media.
Before any type of operation and/or maintenance is performed, make sure that:
- actuator, accessories and all connected equipment are not under pressure and in safe conditions;
- fluid supply, power or other energy sources and signals are disconnected;
- actuator is free from any mechanism able to move.
11.1 Periodic Inspections and maintenance
Periodic visual inspections are recommended. The user shall:
- plan and provide for a periodic cleaning/maintenance program that will maintain the external surface of
the SC/Vo actuator free from excessive layer of dust.
- Lubrication the externalmechanical devices in motion every six months (see Section 11.3 for the correct
grease type).
- Check painting status of the entire actuator at least every three months. If any damage on the painting
film is present, the user shall immediately carry out an adequate painting touch-up.
- Replace the gaskets and the grease every 2-3 years depending on the actuator operating conditions.
- Check oil level every three working months. In this case it is necessary:
oto carry the piston to the top dead centre.
oCheck that oil level into the tank is as stated on the measuring stick insert in the tank and
eventually add the necessary quantity.
oAdded oil must be free from impurities that might damage the hydraulic resistance mounted
on the circuit.
11.2 Extraordinary maintenance
In case of extraordinary maintenance, following malfunction and related troubleshooting, proceed as written
in Section 13.

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 12 -
11.3 Greases
SC/Vo cylinder
material
Very Low
temperature
(Tmin ≤ -40°C)
Low
temperature
(-40°C< Tmin <-
20°C)
Standard
temperature
(-20°C ≤ T ≤ -70°C)
High
temperature
(Tmax > 70°C)
Aluminum
RHEOLUBE 361F
(Tecnolube seal)
RHOESIL 500F
(Tecnolube seal)
MOLYGUARD
IDROSFER
SYNTHY 101
(Tecnolube seal)
Nickel plated
carbon steel
RHEOLUBE 361F
(Tecnolube seal)
RHOESIL 500F
(Tecnolube seal)
MOLYGUARD
IDROSFER
SYNTHY 101
(Tecnolube seal)
Chrome plated
carbon steel
RHEOLUBE 361F
(Tecnolube seal)
RHOESIL 500F
(Tecnolube seal)
POLIMER 400/1
(Tecnolube seal)
SYNTHY 101
(Tecnolube seal)
Stainless steel
RHEOLUBE 361F
(Tecnolube seal)
RHOESIL 500F
(Tecnolube seal)
POLIMER 400/1
(Tecnolube seal)
SYNTHY 101
(Tecnolube seal)
Fiber
RHEOLUBE 361F
(Tecnolube seal)
RHOESIL 500F
(Tecnolube seal)
POLIMER 400/1
(Tecnolube seal)
SYNTHY 101
(Tecnolube seal)
Manual
override
material
Very Low
temperature
(Tmin ≤-40°C)
Low
temperature
(-40°C<Tmin<-20°C)
Standard
temperature
High
temperature
(Tmax > 70°C)
All material
MOLIKOTE
MU EP
(Agip)
MU EP
(Agip)
MU EP
(Agip)

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Manual 5009, rev. 01 09/2019 –SC/Vo
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11.4 Gaskets replacement
Warning
The following instructions must be respected:
- operations must be carried out only by qualified staff (STI operators or
operators qualified by STI are recommended);
- always wear protective clothing, gloves, and eyewear to prevent personal
injury. Check with your process or safety engineer for any additional
measures that must be taken to protect against process media.
During gaskets replacement, for both size 150mm and 200mm:
- take care to not damage gaskets grooves during maintenance;
- use only the grease type shown in the enclosed table.
Disassembling:
9.1 Disconnect the actuator from the air supply and ensure the actuator is not pressurized.
9.2 Disconnect the actuator stem from the pump stem.
9.3 Disassemble the upper actuator cover by removing the screws (pos.12) and all the accessories /
fittings where needed.
9.4 Remove the shaft (pos.17) and piston (pos.5) from the cylinder (pos.1).
9.5 Remove o-ring (pos. 9) from the cylinder.
9.6 Remove the sliding ring (pos. 14) and o-ring (pos.15) from the piston.

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Manual 5009, rev. 01 09/2019 –SC/Vo
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9.7 Remove snap ring (pos.4). Push the bushing (pos.2) towards the inside of the actuator and remove
the gaskets (pos.3,10 and 19).
9.8 For stroke lengths of less than 100 mm (top mounting positioner):
9.8.1 remove screws (pos.24);
9.8.2 remove the positioner and its linkage and remove the flange;
9.8.3 replace the wiper ring (pos.22) and o-rings (pos.25 e 23).
Replacement:
9.9 Clean the actuator parts with a mild detergent suitable for grease using a brush, then dry with a cloth
and compressed air.
9.10 Apply grease on the rough parts of the bottom of the cylinder. Do not apply grease of the machined
surfaces on the bottom of the cylinder.
9.11 Apply grease to theo-ringsand install them on thebushings. Insert and fix the bushing into thecylinder.
9.12 Fill the grease reservoir along the outer rim of the piston.
Important
Apply grease to gaskets prior installation.
9.13 Install new gaskets kit.
9.14 Apply grease to the inside surface of the cylinder.
9.15 Install the sliding ring on the piston.
9.16 Install the o-ring on the piston and remove the excess grease.
9.17 Insert the piston into the cylinder.
9.18 Mount the upper cover on the actuator. Torque the nuts to the value indicated into the table below.
9.19 Test the piston movement using an air gun.
9.20 Plumb all pneumatic connections and check for air leaks at 1 bar (0,1 MPa) air supply pressure. If
there are no leaks, repeat the test at 7 bar (0,7 MPa).
9.21 Remove the excess grease from the shaft.
Size
Torque [Nm]
150
10 (7,4 lbf-ft)
200
14 (10,3 lbf-ft)

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Manual 5009, rev. 01 09/2019 –SC/Vo
- 15 -
12 PARTS LIST GENERAL ASSEMBLY
Figure 4 –Casting Actuator: typical design

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Manual 5009, rev. 01 09/2019 –SC/Vo
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Figure 5 –Casting Actuator: typical design

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Manual 5009, rev. 01 09/2019 –SC/Vo
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Figure 6 –Casting Actuator: option A