Flowserve LPC Series User manual

Installation
Operation
Maintenance

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
Index
STANDARD INFORMATION............................................................................................................................... 3
1.1. TERMS CONCERNING SAFETY ....................................................................................................................... 3
1.2. GENERAL USAGE .......................................................................................................................................... 4
1.3. PROTECTIVE CLOTHING................................................................................................................................ 5
1.4. QUALIFIED PERSONNEL ................................................................................................................................ 5
1.5. OTHER REQUIREMENTS FOR IN-PLANT INSTALLATION.................................................................................. 5
1.6. SPARE PARTS................................................................................................................................................ 5
1.7. SERVICE/REPAIR........................................................................................................................................... 5
1.8. ACTUATOR LIFTING AND HANDLING............................................................................................................. 6
1.9. STORAGE.................................................................................................................................................... 10
1.10. VALVE AND ACTUATOR VARIATIONS......................................................................................................... 11
1.11. UNPACKING ............................................................................................................................................. 11
INSTALLATION INSTRUCTIONS........................................................................................................................ 12
2.1. VALVE AND ACTUATOR CHECK.................................................................................................................... 12
2.2. CONNECTION WITH VALVE AND MOUNTING KIT......................................................................................... 13
2.3. TRAVEL-STOP BOLT AND ACCESSORIES....................................................................................................... 15
2.4. GROUNDING SYSTEM................................................................................................................................. 19
2.5. INITIAL OPERATION.................................................................................................................................... 19
2.6. FAIL OPEN AND FAIL CLOSE CONFIGURATION ............................................................................................. 20
FIELD CONVERSION........................................................................................................................................ 22
3.1. ACTUATOR DISASSEMBLED FROM THE VALVE............................................................................................. 22
MAINTENANCE INSTRUCTIONS ...................................................................................................................... 23
4.1. MAINTENANCE -INTRODUCTION ............................................................................................................... 23
4.2. ACTUATOR ORDINARY MAINTENANCE ....................................................................................................... 24
4.3. ACTUATOR EXTRAORDINARY MAINTENANCE ............................................................................................. 25
4.4. GENERAL DISASSEMBLY INSTRUCTIONS...................................................................................................... 26
4.5. SUBSTITUTION OF AIR-SPRING MODULE..................................................................................................... 28
4.6. PNEUMATIC CYLINDER MAINTENANCE....................................................................................................... 29
4.7. HOUSING AND SCOTCH YOKE MAINTENANCE............................................................................................. 31
4.8. SPARE PARTS.............................................................................................................................................. 33
TROUBLESHOOTING....................................................................................................................................... 34
DISPOSAL OF DECOMMISSIONED ACTUATORS ............................................................................................... 39
ANNEXES ....................................................................................................................................................... 40

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
STANDARD INFORMATION
USING FLOWSERVE VALVES, ACTUATORS AND ACCESSORIES CORRECTLY
The following instructions are designed to assist in unpacking, installing and performing maintenance on
Flowserve products. Product users and maintenance personnel should thoroughly review this bulletin
prior to installing, operating or performing any maintenance.
In most cases Flowserve actuators and accessories are designed for specific applications with regard to
medium, pressure and temperature. For this reason, they should not be used in other applications without
first contacting the manufacturer.
1.1. TERMS CONCERNING SAFETY
The safety terms DANGER, WARNING, CAUTION and NOTE are used in these instructions to highlight
particular dangers and/or to provide additional information on aspects that may not be readily apparent.
DANGER: indicates that death, severe personal injury and/or substantial property damage will
occur if proper precautions are not taken.
WARNING: indicates that death, severe personal injury and/or substantial property damage can
occur if proper precautions are not taken.
CAUTION: indicates that minor personal injury and/or property damage can occur if proper
precautions are not taken.
NOTE: indicates and provides additional technical information, which may not be very obvious,
even to qualified personnel.
Compliance with other, not particularly emphasized notes, with regard to transport, assembly, operation
and maintenance and with regard to technical documentation (e.g., in the operating instruction, product
documentation or on the product itself) is essential, in order to avoid faults, which in themselves might
directly or indirectly cause severe personal injury or property damage.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
1.2. GENERAL USAGE
To prolong actuator life, use only clean, dry pneumatic supply fluids. Lubricated fluids are not required for
LPL actuators. Pay attention to follow positioner and other control prescriptions, regarding supply fluid
instrument air.
The LPC actuator standard ambient temperature range is: -29°C to 100°C (-20°F to 212°F). Low
temperature -60°C (-76°F) and High temperature 160°C (320°F) ranges (polar, cold, arid and tropical
temperature requirements in accordance with IEC 60721) are available with different materials of
construction. In any case, please refer to the temperature range indicated in actuator nameplate.
NOTE: For PED certified applications the standard operating temperature range is -20°C to 100°C
(-4°F to 212°F). For lower temperature applications the range can be extended to -40°C to +100°C
(-40°F to 212°F) or -50°C to +100°C (-58°F to 212°F) with different materials of construction. In any case,
please refer to the temperature range specified on the actuator nameplate.
It is the end user’s responsibility to guarantee that the ambient temperature is in accordance with
actuator nameplate indications.
WARNING: Do not exceed the minimum and maximum allowable temperatures indicated on the
actuator nameplate. Additional factors like the valve and pipe temperatures, sun direct exposure
and other environmental conditions shall be considered, not to exceed the temperature range.
WARNING: Do not exceed the allowable pressure range of the supply fluid, as stated in the
actuator nameplate. It is very important to make the standard maintenance at all safety
components. In case of PED certified cylinders, the value of design pressure of the cylinder is
indicated on a specific and separate nameplate. It is necessary to verify that the supply line to
the actuator does not exceed the design pressure stated in the cylinder nameplate.
NOTE: The standard supply fluids are instrument air and nitrogen. Different types of fluids may
be used only after Flowserve verification. In case of PED certified cylinders, the fluid category is
indicated on the specific nameplate on the cylinder.
WARNING: Only use the recommended type of fluid that is indicated on the nameplate and/or
in the contract.
NOTE: The supply fluid must be properly filtered. In case of positioner and/or other components
installed on the control panel, take care that the cleanliness, the filtration and the dehydration
of the supply fluid are in accordance with the requirements of these accessories indicated on
their own maintenance and user manuals.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
1.3. PROTECTIVE CLOTHING
Flowserve products are often used in dangerous applications (e.g., extremely high pressures, dangerous,
flammable, combustible, toxic or corrosive media). When performing service, inspection or repair
operations, always ensure that the valve and actuator are depressurized and that the valve has been
cleaned and is free from harmful substances. In such cases pay particular attention to personal protection
equipment (protective clothing, gloves, glasses, etc.).
1.4. QUALIFIED PERSONNEL
Only qualified personnel should perform installation, operation or maintenance activities. Qualified
personnel are people who, on account of their training, experience, instruction and their knowledge of
relevant standards, specifications, accident prevention regulations and operating conditions, have been
authorized by those responsible for the safety of the plant to perform the necessary work and who can
recognize and avoid possible dangers.
NOTE: The operations of installation and maintenance on LPC Actuators can be performed by
qualified personnel ONLY.
1.5. OTHER REQUIREMENTS FOR IN-PLANT INSTALLATION
• Pipelines must be correctly aligned to ensure that the valve is not fitted under tension.
• If not expressly agreed, fire protection is not supplied along with the actuator and it must be provided
by the user.
1.6. SPARE PARTS
Use only Flowserve brand original spare parts. Flowserve cannot accept responsibility for any damages
that occur from using spare parts or fastening materials from other manufacturers. If Flowserve products
(especially sealing materials) have been in storage for long periods, check them for corrosion or
deterioration before usage. A table with the list of the main spare parts for standard ON/OFF applications
can be found in Table 1 of Paragraph 4.8.
1.7. SERVICE/REPAIR
To avoid injury to personnel or damage to products, safety terms must be strictly adhered to. Modifying
this product, substituting non-factory parts, or using maintenance procedures other than as outlined in
this instruction manual could drastically affect performance and be hazardous to personnel and
equipment, and may void existing warranties.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
Between actuator and valve there are moving parts. To avoid injury, Flowserve provides pinch-point-
protection in the form of cover plates, especially where side-mounted positioners are fitted. These
protections are according to Machine Directive 2006/42/EC recommendations. If these plates are
removed for inspection, service or repair, special attention is required. After completing work, the cover
plates must be refitted.
In addition to the operating instructions and the obligatory accident prevention directives valid in the
country of use, all recognized regulations for safety and good engineering practices must be followed.
WARNING: Before products are returned to Flowserve for repair or service Flowserve must be
provided with a certificate which confirms that the product has been decontaminated and is
clean. Flowserve will not accept deliveries if a certificate has not been provided (a form can be
obtained from Flowserve).
1.8. ACTUATOR LIFTING AND HANDLING
Only Allen wrenches and hexagonal wrenches of few sizes are required for the overall operations. The
lifting equipment consists of commercial chains and slings of adequate dimensions.
In order to prevent damage to actuator accessories, before starting the lifting operations, ensure that the
lifting tools, like chain and clevis hook, are in the correct position and don’t interfere with the control
panel and related tubing.
For determination of correct lifting equipment always check actuator weight. Tis information is always
available in Order Documentation supplied along with actuator. Usually actuator weight is reported on
the packing slip and on the overall-dimensions drawings.
LPC actuators are provided with special lifting points, consisting of male/female eyebolts or lifting lugs.
Lifting points position and type varies according to weight, dimensions and construction features of
individual LPC models. In order to identify the location of the lifting points, refer to Order Documentation
supplied with the actuator.
For actuator weight, please, refer to Tables 9 and 10. For the general actuator dimensions please refer to
LPC technical bulletin LFENTB0002, available on www.flowserve.com.
CAUTION: Lifting and handling of the actuator should be done by qualified personnel and in
compliance with the laws and regulations in force.
WARNING: During the lifting operations do not stand under the actuator. The actuator should
be handled with appropriate lifting equipment
DANGER: Actuator lifting lugs or eyebolts are appropriate for actuator lifting only. They are not
designed to support the combined weight of the valve and actuator assembly together.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
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Date: 05/ 2021
Limitorque Fluid Power Systems
WARNING: ONLY for LPC-05 and LPC-10 models
WARNING: For lifting and handling use the appropriate lifting arrangement. Do not lift the
actuator with the valve assembled.
WARNING: After transportation, inspect the components to look for any damage.
DANGER: NEVER lift the actuator with the valve assembled.
Figure 1: Correct Lifting of LPC-05 and LPC-10 Actuator
Figure 1a: Use of Lifting Lug
on the housing
DANGER: For lifting and handling, use
the lifting lugs on the housing and on
the tail flange.
Figure 1b: Use of Lifting Lug
on the tail flange

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
WARNING: ONLY for LPC-12 and LPC-14 models
WARNING: For lifting and handling use the appropriate lifting arrangement. Do not lift the
actuator with the valve assembled.
WARNING: After transportation, inspect the components to look for any damage.
DANGER: NEVER lift the actuator with the valve assembled.
Figure 2a: Use
of Eyebolt on
the housing
Figure 2b: Use
of Lifting Lug
on the tail
flange
Figure 2: Correct Lifting of
LPC-12 and LPC-14 Actuator
DANGER: For lifting and
handling, use the lifting
points on the housing
and on the tail flange.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
WARNING: For lifting and handling use the appropriate lifting arrangement. Do not lift the
actuator with the valve assembled.
WARNING: After transportation, inspect the components to look for any damage.
DANGER: NEVER lift the actuator with the valve assembled.
Figure 3: Single Acting Actuator Center of Gravity Position and Lifting Arrangement for LPC-05, LPC-10, LPC-12 and LPC-14
Figure 4: Double Acting Actuator Center of Gravity Position and Lifting Arrangement for LPC-05, LPC-10, LPC-12 and LPC-
14

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recipient, or used for any other purpose without the written permission of Flowserve Corporation. This document shall be returned upon request.
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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
1.9. STORAGE
Flowserve actuators are typically provided with an epoxy resin coating or with other painting systems as
agreed with the customer. This means that Flowserve products are well protected from corrosion.
Nevertheless, in order to maintain good working conditions and a good finish, until the actuator is
installed in the plant, it is necessary to follow a few rules during the storage period:
Flowserve products must be stored adequately in a clean, dry environment.
Ensure that plastic caps are fitted to protect the pneumatic connections and the cable entries,
to prevent the ingress of foreign materials. These caps should not be removed until the product
is actually mounted into the system.
If the storage is outdoors, or if long-term storage is necessary, (more than four months), the
plastic protection plugs must be replaced with metal plugs, because the plastic plugs are not
weatherproof, whereas the metal ones guarantee weatherproof protection.
The actuator must be placed on a wooden pallet, in order to not damage the coupling base and
avoid the other surfaces resting on the ground.
In case of long-term storage (more than four months), additionally perform the following measures:
a) Coat the coupling parts (spool piece base, flanges, bushings, joints) with protective oil or grease.
b) If possible, blank off the spool piece base flange with a protection disk.
c) Provide a tarpaulin cover or some other means of protection, especially if the storage is outdoors.
d) It is important to periodically operate the actuator with filtered, dehydrated and lubricated air while
in storage.
CAUTION: Do not lean the actuator on
cylinder tie rods

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
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Date: 05/ 2021
Limitorque Fluid Power Systems
1.10. VALVE AND ACTUATOR VARIATIONS
These instructions cannot claim to cover all details of all possible product variations, nor can they provide
information for every possible example of installation, operation or maintenance. If there are any
uncertainties in this respect particularly in the event of missing product-related information, clarification
must be obtained via the appropriate Flowserve sales office.
1.11. UNPACKING
Each delivery includes a packing slip. When unpacking, check all delivered actuators and
accessories using this packing slip.
Report transportation damage to the carrier immediately.
In case of discrepancies, contact your nearest Flowserve location.
If necessary, retouch minor damage to the paint coating which may have occurred during
transport or storage.
WARNING: Ensure that the addendum “ATEX/PED/Machinery Directive Safety Manual - LPS-
LDG-LGO-LHS-LHH Actuators” (doc. LFENEU000A) accompanies this manual, when the actuator
is under one (or more) of the following European Directives:
• 2006/42/EC - Machinery Directive
• 2014/34/EU - ATEX Directive
• 2014/68/EU - PED Directive
If this addendum is not available to you, please contact Flowserve.
NOTE: When the actuator has SIL requirements according to IEC 61508, ensure that the “LPC
Series Functional Safety Manual” accompanies this manual and is referred to for equipment
usage.
NOTE: Pneumatic cylinder design is based on seismic acceleration of 0.5 g provided as reference
by EN 1998-1:2004. It is under user’s responsibility to verify that seismic loads of the
geographical installation region of the actuator are in conformity with the reference acceleration
value of 0.5 g. For any support, please contact your Flowserve Limitorque representative.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
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Date: 05/ 2021
Limitorque Fluid Power Systems
INSTALLATION INSTRUCTIONS
The LPC range of Limitorque pneumatic actuator is a robust, lightweight modular Scotch yoke design,
available in both spring return and double acting configurations; with torque range up to 5.500 Nm (up to
4.060 ft-lbs), with a mounting base in compliance with ISO 5211 and Figures 26 and 27 “LPC Mounting
Interface Dimensions”. It may also be customized.
WARNING: Actuator operation/pressure limitations must be in accordance with Technical
Bulletin (LFENTB0002); contact Flowserve to get the last version.
LPC actuators are suitable for use in on/off, modulating and control applications. They can also be used in
safety services such as emergency shutdown (ESD) or high-integrity pressure protection systems (HIPPS).
LPC actuators permit to perform Safety Functions through one of the two following “fail actions”: “Fail
Close” or “Fail open”, by choosing the suitable design configuration (in case of single acting actuators) or
by choosing the suitable pneumatic control system (in case of double acting actuators).
WARNING: Actuator operation/pressure limitations must be in accordance with the job
documentation supplied along with the actuator, and with main data reported on actuator
nameplate. If you are not in possession of all relevant information for the correct operation of the
actuator, contact Flowserve before starting any activity.
2.1. VALVE AND ACTUATOR CHECK
DANGER: Before installation check the order-no., serial-no. and/or the tag-no. to ensure that the
valve/actuator is correct for the intended application.
NOTE: The air supply port and discharge are indicated by dedicated plates positioned close to
the ports, as shown in Figure 7. In case of a double acting actuator, the ports for the air supply
are identified by a number, according to ISO 5599-2.
NOTE: The fail safe direction of rotation is identified by a dedicated plate, as shown in Figure 8,
in accordance with EN 15714-3.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
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Date: 05/ 2021
Limitorque Fluid Power Systems
Before starting any installation activity, check also that Actuator pressure limitations and environmental
limitations (Ambient Temperature and, if applicable, Explosion Risk Marking), are in accordance with plant
requirements. This Information is always reported on actuator nameplate, as shown in typical Actuator
Nameplate, shown in Figure 10.
Before mounting the actuator to the valve, manually open and close the valve (if possible), to ensure it is
not stuck. Be sure valve and Limitorque open and closed positions coincide (i.e., valve closed,
position=actuator closed position). The assembly position of the actuator, with reference to the valve, has
to be in accordance with the plant requirements and Job Order Documentation.
2.2. CONNECTION WITH VALVE AND MOUNTING KIT
The LPC actuator is usually supplied with bracket/spool piece already assembled Stem adapters / coupling
joint are assembled during connection with valve, through the steps described here below. To assemble
the actuator onto the valve, perform the following steps:
Figure 10: Nameplate Sample
Figure 8: Fail CW Plate. According to
EN15714-3 Standard
Figure 7: Air Supply
Plate
Figure 9: Standard Nameplate
Position

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
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Limitorque Fluid Power Systems
Check the mounting surfaces, of actuator bracket and valve and check
the stem adapters to assure proper fit. In particular, clean the flanges
of valve and spool bracket to remove oils and greases since the torque
is transmitted by friction. Also, remove any rust that may have
occurred during storage
Secure the valve (possibly with the stem oriented vertically) in Close
position in case of Single Acting Fail Close actuator and in Open
position in case of Single Acting Fail Open actuator; in case of Double
Acting Fail Last actuator, secure the valve in the same Close/Open
position as the actuator that will be installed onto the valve.
Install the centering ring on the valve side of the bracket (if any).
Install valve stem adaptor.
Lift the actuator by the special lift points (eyebolts), using a proper
lifting system. Position the actuator over the valve and lower to
engage the stem adaptor to the actuator bore. Continue to lower until
the spool piece sits on valve mounting surface. This coupling has to
take place without force and only with the weight of the actuator. The
mounting bolts (or studs) of the valve should easily fit into the bolt
holes of the spool piece without any binding. If needed, turn or stroke
the actuator a few degrees and/or adjust the actuator travel-stops.
The mounting nuts (or bolts) connecting the base of the spool piece
to the valve flange must be evenly tightened according to tightening
torque table without lubricant (Tables 6 and 7 in Annex section).
WARNING: In case of spool piece/bracket installation by the client, it
is mandatory to refer “Mounting Interface Dimensions” provided with
order documentation, or to follow more specific instructions also
included in the job documentation supplied along with the actuator.
These assembling instructions include details of prescribed stud bolts
and their maximum allowable threaded length.
WARNING: The lifting lugs or eyebolts are appropriate for actuator lifting only. They are not
designed to support the combined weight of the valve and actuator together. During the lifting
operations do not stand under the actuator. The actuator should be handled with appropriate
lifting means. The weight of the actuator is reported on the packing slip and on the overall-
dimensions drawing furnished with the documentation accompanying the actuator.

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
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Revision: 06
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Limitorque Fluid Power Systems
NOTE: In some cases, the coupling between valve and actuator can be direct, without the need
of a spool piece. In these cases, Flowserve can provide an intermediate adaptor flange (fitted
under the actuator base) and a special bushing to be inserted into the yoke bore.
CAUTION: actuator lifting, and handling should be made by qualified personnel and in
compliance with the laws and provisions in force
2.3. TRAVEL-STOP BOLT AND ACCESSORIES
Actuated valves may require accurate travel-stop adjustments to obtain optimum performance and valve
seat life. If necessary, adjust the travel-stop bolt of the actuator for the proper open/close valve positions,
per valve manufacturer’s recommendations.
The LPC actuators have travel-stop adjustments in both the clockwise and counter-clockwise directions.
The +/- 5-degree adjustment feature provides shaft rotation from 80 to 100 degrees overall.
The adjustment of the travel-stop is performed in accordance with the following steps. After the
adjustment of the travel-stop, pneumatically stroke the actuator several times to assure proper operation.
If the actuator is equipped with limit switches, positioner or other accessories, adjust them at this time.
DANGER: Do not attempt this maintenance operation with cylinder under pressure
WARNING: Before performing any maintenance operation it’s mandatory to remove the
pressure inside the cylinder. Make sure that the pneumatic connection ports of the cylinder are
disconnected and open to the ambient. Also make sure that all pneumatic supplies to the control
unit and all power supplies are disconnected. Make sure that the actuator is in the fail position,
i.e., that it is not locked in a position with the spring compressed because of jams or by means
of locking tools.
WARNING: In order to prevent damage of the actuator, during the travel-stop adjustment do
not exceed the values of -5 degrees and 95 degrees.
Pneumatic cylinder travel-stop bolt adjustment
Refer to figure 11 and 12 for next instructions and descriptions.
DANGER: Always make a check in order to have a safety engagement of the stopper bolt in the
tail flange during this operation. In case of need to fully remove the travel stop, it is mandatory
do not have pressure inside the cylinder in order to avoid any possible risk for the operators.

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DANGER: refer to Figures 28 and 28a for maximum distance “A”, in order to have a safety
engagement of the stopper bolt in the tail flange during this operation. In case of need to fully
remove the travel stop, when exceed the maximum distance “A” it is mandatory to don’t have
the pressure inside the cylinder in order to avoid risks for the operators.
NOTE: If necessary in order to facilitate unscrewing of the cylinder stopper bolt and only for
spring return actuator, feed the pneumatic cylinder from the air connection port placed on the
tail flange (the flange where the stopper is screwed) at minimum necessary pressure to facilitate
stopper unscrewing (starting from 0 barg and slowly increasing the pressure up to max 2 barg in
order until the spring begins to compress, and stopper get free from piston load);
NOTE: the following procedure can be applied even for the adjustment of the stop bolt installed
on the center body for double effect actuators.
2.3.1.1 Using appropriate wrench, hold still the stopper bolt (19) and using a second screw, unscrew
the stopper nut (20).
2.3.1.2 Fully remove the stopper nut (20).
2.3.1.2 Fully remove the o-ring (21).
2.3.1.4 Manually screw or unscrew the stopper bolt (19) in the flange (23), (or in the housing (30)) using
appropriate wrench, until desired position has been reached. Do not use automatic devices (e.g.
electric/air screwier, etc...);
2.3.1.5 Manually slip the new o-ring (21) properly in front of flange (23) (or in front of the housing (30)),
taking attention to not make cuts in it because of stopper sharp threads;
NOTE:Do not use stopper nut (20) to drag the o-ring (21) on the stopper bolt (19);
2.3.1.7 Screw the stopper nut (20);
2.3.1.8 Using appropriate wrench, hold still the stopper bolt (19) and using a second screw, tighten the
stopper nut (20).
NOTE: Always replace the O-Ring (21) during travel stop adjustment.

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Page 17 of 49
USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
Pneumatic cylinder travel-stop bolt adjustment (version with enclosed stopper bolt
protection)
Refer to figure 13 for next instructions and descriptions
NOTE: If necessary in order to facilitate unscrewing of the cylinder stopper bolt and only for
spring return actuator, feed the pneumatic cylinder from the air connection port placed on the
tail flange (the flange where the stopper is screwed) at minimum necessary pressure to facilitate
stopper unscrewing (starting from 0 barg and increasing the pressure slowly up to max 2 barg in
order to facilitate unscrewing, until the spring begins to compress, and stopper get free from
piston load).
DANGER: In order to have a safety engagement of the stopper bolt in the tail flange during this
operation. In case of need to fully remove the travel stop. It is mandatory do not have pressure
inside the cylinder in order to avoid any possible risk for the operators.
DANGER: refer to Figure 28 and Figure 28a for maximum distance “A”, in order to have a safety
engagement of the stopper bolt in the tail flange during this operation. In case of need to fully
remove the travel stop, when exceed the maximum distance “A” it is mandatory to don’t have
the pressure inside the cylinder in order to avoid risks for the operators.
NOTE: the following procedure can be applied even for the adjustment of the stop bolt installed
on the center body for double effect actuators.
30
21
20
19
19
20
21
23
Figure 11: Housing Standard Stopper Exploded View
Figure 12: Cylinder Standard Stopper Exploded View

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
2.3.2.1 Using appropriate wrench, hold still the stopper bolt protection (C) and using a second screw,
unscrew the protection plug (E).
2.3.2.2 Remove the o-ring of the protection plug (D).
2.3.2.3 Using appropriate wrench, hold still the stopper bolt (A) and using a second screw, unscrew
the stopper bolt protection (C).
2.3.2.4 Remove the o-ring of the stopper bolt protection (B), by unscrewing it.
2.3.2.5 Manually screw or unscrew the stopper bolt (A) in the flange (or in the housing) using
appropriate wrench until desired position has been reached. Do not use automatic devices (e.g.
electric/air screwier, etc...);
2.3.2.6 Insert a new o-ring if the old one is damaged, for the stopper bolt protection (B).
2.3.2.7 Screw the stopper bolt protection (C)
2.3.2.8 Using appropriate Allen key, hold still the stopper bolt (A) and using a second screw, tighten
the stopper bolt protection (C).
2.3.2.9 Insert a new o-ring for the protection plug (D).
2.3.2.10 Manually screw the protection plug (a) on the stopper bolt protection (C).
2.3.2.11 Using appropriate wrench, hold still the stopper bolt protection (C) and using a second screw,
tighten the plug (E).
NOTE: Always replace the O-Rings (B and D) during travel stop adjustment.
Figure 13 - Enclosed Stopper Exploded View
A
E
D
C
B

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This document contains proprietary information that is the property of Flowserve Corporation. This document may not, in whole or in part, be duplicated, disclosed to other than the present
recipient, or used for any other purpose without the written permission of Flowserve Corporation. This document shall be returned upon request.
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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
2.4. GROUNDING SYSTEM
For the actuator earthing, use the special grounding kit, shown in 14, 15, 16 and 18.
Letter
Description
A
High Nut
B
Ground Nameplate
C
High Nut
D
Grub Screw
E
Lock Washer
F
High Locking Nut with Nylon Insert
2.5. INITIAL OPERATION
Before initial operation of the actuator, perform the following checks:
Check that all electrical supply, control and signal lines are properly connected, by following the
dedicated customer procedures.
Check that the pressure and quality of the supply fluids are as prescribed.
Check the absence of leaks in the pneumatic connections. If necessary, tighten the pipe fittings.
Check that the environmental conditions are compatible with the design conditions. For
information, contact Flowserve.
Figure 16 - Grounding Kit
Detail
Figure 14: Grounding Kit Exploded View
C
D
E
F
A
B
Figure 15 Grounding
Kit Assembled
Figure 17 - Grounding Kit list
of Components

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USER INSTRUCTIONS
LPC ACTUATOR SERIES
Doc. Number: LFENIM0002-06-A4-05/21
Revision: 06
Date: 05/ 2021
Limitorque Fluid Power Systems
2.6. FAIL OPEN AND FAIL CLOSE CONFIGURATION
The actuator is designed for work in both configurations: fail open and fail close. For conversion from
one configuration to the other, refer to next paragraph.
Figure 18 –Single Acting Actuator Configuration: Fail Close-Fail Clockwise
Figure 19 –Single Acting Actuator Configuration: Fail Open-Fail Counter Clockwise