SIST EN 15714-3:2023

SLOVENSKI STANDARD
oSIST prEN 15714-3:2021
01-november-2021
Nadomešča:
SIST EN 15714-3:2011
Industrijski ventili - Pogoni - 3. del: Pnevmatični pogoni z delnim zasukom za
industrijske ventile - Osnovne zahteve
Industrial valves - Actuators - Part 3: Pneumatic part-turn actuators for industrial valves -
Basic requirements
Industriearmaturen - Antriebe - Teil 3: Pneumatische Schwenkantriebe für
Industriearmaturen - Grundanforderungen
Robinetterie industrielle - Actionneurs - Partie 3: Actionneurs pneumatiques à fraction de
tour pour robinetterie industrielle - Prescriptions de base
Ta slovenski standard je istoveten z: prEN 15714-3
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
oSIST prEN 15714-3:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 15714-3:2021

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oSIST prEN 15714-3:2021


DRAFT
EUROPEAN STANDARD
prEN 15714-3
NORME EUROPÉENNE

EUROPÄISCHE NORM

September 2021
ICS 23.060.20 Will supersede EN 15714-3:2009
English Version

Industrial valves - Actuators - Part 3: Pneumatic part-turn
actuators for industrial valves - Basic requirements
Robinetterie industrielle - Actionneurs - Partie 3: Industriearmaturen - Antriebe - Teil 3: Pneumatische
Actionneurs pneumatiques à fraction de tour pour Schwenkantriebe für Industriearmaturen -
robinetterie industrielle - Prescriptions de base Grundanforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 69.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15714-3:2021 E
worldwide for CEN national Members.

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Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Classification/Designation . 7
4.1 Duty classification . 7
4.1.1 General. 7
4.1.2 On-off duty . 8
4.1.3 Modulating duty . 8
4.2 Action . 8
4.2.1 Double Acting (DA) . 8
4.2.2 Single Acting (SA) . 8
5 Motive energy . 8
5.1 Operating medium. 8
5.2 Quality . 8
5.3 Pressure . 8
6 Actuator performance data . 9
6.1 Minimum moving pressure . 9
6.2 Operating time . 9
6.3 Displacement volume . 9
7 Basic design requirements . 9
7.1 Safety requirements . 9
7.2 Actuator attachment . 9
7.3 Angular stroke . 9
7.4 Endurance of part-turn actuators . 9
7.5 Leakage . 10
7.6 Environmental conditions . 11
7.6.1 Ambient temperature. 11
7.6.2 Enclosure protection . 11
7.6.3 Corrosion protection . 11
7.7 Pressure connections . 12
7.7.1 General. 12
7.7.2 Remotely mounted pilot valves . 12
7.7.3 Direct mounted pilot valves . 13
7.8 Pressure connections for single acting actuators . 14
7.9 Fail safe direction for single acting actuators . 14
7.10 Structural safety factors . 14
7.11 Position indication . 15
8 Optional equipment . 15
8.1 Ancillaries . 15
8.2 Manual operation . 17
8.3 Mechanical end stop adjustment . 18
9 Conformity assessment . 18
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9.1 General . 18
9.2 Type tests . 18
9.3 Control of production process . 19
10 Marking . 20
10.1 Basic requirements on marking . 20
10.2 Optional information . 20
11 Documentation . 21
12 Part-turn actuator selection guidelines . 21
Annex A (normative) Actuator type test procedure . 22
Annex B (informative) Actuator selection guidelines . 24
Bibliography . 28
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European foreword
This document (prEN 15714-3:2021) has been prepared by Technical Committee CEN/TC 69 “Industrial
valves”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15714-3:2009.
In comparison with the previous edition, the following technical modifications have been made:
— addition of new terms and definitions;
— improvement of the classification and the designation with on-off and modulating duty classification;
— addition of a new Clause 5 on motive energy;
— enhancement of the basic design requirements;
— modification of the conformity assessment with type test indications and control of production
process.
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1 Scope
This document provides basic requirements for pneumatic part-turn valve actuators, both double acting
and single acting, used for on-off and modulating control duties.
It includes guidelines, recommendations and methods for enclosure and corrosion protection, control
and testing.
It does not apply to pneumatic actuators which are integral parts of control valves and to pneumatic
actuators designed for permanent immersion in fresh or sea water.
Other requirements, or conditions of use, different from those indicated in this document, are expected
to be subject to negotiations, between the purchaser and the manufacturer/supplier, prior to order.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
EN ISO 5211, Industrial valves - Part-turn actuator attachments (ISO 5211)
EN 12570, Industrial valves — Method for sizing the operating element
EN 15714-1, Industrial valves - Actuators - Part 1: Terminology and definitions
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
ISO 5599-2, Pneumatic fluid power — Five-port directional control valves — Part 2: Mounting interface
surfaces with optional electrical connector
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15714-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
part-turn actuator
actuator which transmits torque to the valve for less than one revolution; it does not have the capability
of withstanding thrust
Note 1 to entry: Part-turn actuators are classified by action and duty.
3.2
stroke
single and complete movement from one end of travel to the other
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3.3
end stop
mechanical part designed to stop the actuator drive train at an end position
Note 1 to entry: End stop can be fixed or adjustable.
3.4
output torque
minimum guaranteed output torque capability of the actuator, in both directions, at specified supply
pressures conditions as provided by the manufacturer/supplier
Note 1 to entry: Where the output torque varies with the stroke, in a linear or nonlinear relationship with pressure,
tabulated data and/or torque versus stroke diagram shall be provided at significant pressure values for each
direction of movement.
3.4.1
rated torque
characterizing figure, indicated by the actuator manufacturer/supplier, used to define the maximum
actuator operating torque
Note 1 to entry: The rated torque corresponds to the maximum torque value developed by the actuator when
powered with maximum allowable pressure.
3.4.2 Nominal torque
3.4.2.1
double acting version
minimum guaranteed output torque of the actuator, at any point of the stroke, with nominal supply
pressure 0,55 MPa (5,5 bar)
3.4.2.2
single acting version
guaranteed output torque of the actuator with pneumatic nominal supply 0,55 MPa (5,5 bar) at the
beginning of the stroke in the direction to compress the spring
3.4.3
start torque
actuator output torque at the beginning of the stroke in the direction of movement
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3.4.4
maximum operating torque
MOT
for double acting version, output torque of the actuator when the pressure of the power supply
corresponds to the maximum allowable pressure; for single acting version the maximum output torque
between the torque at the beginning of the stroke when the pressure of the power supply corresponds to
the maximum allowable pressure and the torque generated by the spring at the end of specified
compression stroke
Note 1 to entry: The maximum torque value shall be indicated by the manufacturer/supplier; the value shall be not
lower than 1,45 times the nominal torque.
3.5.1
Air Starting Torque
AST
output torque, at defined pressure value, at the beginning of the stroke in opposition to the spring
3.5.2
Air Ending Torque
AET
output torque, at defined pressure value, at the end of the stroke when spring is at its maximum
compression
3.5.3
Air Running Torque
ART
any output torque value between AST and AET at defined pressure value
3.5.4
Spring Ending Torque
SET
output torque generated by the spring at the end of its stroke with no air in the cylinder
3.5.5
Spring Starting Torque
SST
output torque generated by the spring at its maximum compression with no air in the cylinder
3.5.6
Spring Running Torque
SRT
any output torque value between SST and SET
4 Classification/Designation
4.1 Duty classification
4.1.1 General
According to their intended function, two versions of linear valve actuators are defined by this document:
on-off duty and modulating duty.
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4.1.2 On-off duty
The actuator is required to drive the valve through its entire travel from the fully open position to the
fully closed position or vice-versa.
4.1.3 Modulating duty
The actuator is required to continuously drive the valve to any position between fully open and fully
closed or vice.
4.2 Action
4.2.1 Double Acting (DA)
Actuator which requires the supply of motive energy to operate in both travel directions.
4.2.2 Single Acting (SA)
Actuator which requires external power to operate the valve in one direction only, the return stroke being
powered by an alternative form of stored energy (Fail-Safe actuators).
For the purpose of this document, the stored energy shall be supplied by a mechanical spring.
5 Motive energy
5.1 Operating medium
The operating medium shall be compressed air, unless otherwise specified. Other compressed gases may
be used, on agreement between the manufacturer/supplier and purchaser, ensuring they are compatible
with all the parts in contact with the fluid including the lubricants.
5.2 Quality
Humidity of the operating medium shall be Class 2 according to ISO 8573-1:2010, Table 2.
For ambient temperature conditions different from the standard stated at 7.6.1, the dew point shall be at
least 10 °C below the minimum operating ambient temperature.
It is recommended that the content of particles per cubic meter in the operating medium shall not exceed
Class 5 according to ISO 8573-1:2010, Table 1; particles up to a maximum 40 µm size are acceptable in
the operating medium provided that a right analysis of the behaviour of the ancillaries (8.1), when
mounted on the actuator, is done.
5.3 Pressure
The manufacturer/supplier shall indicate the actuator’s pressure limits.
Unless otherwise specified the following values shall be considered within the scope of this document:
a) nominal supply pressure: 0,55 MPa (5,5 bar);
b) maximum allowable pressure shall be at least 0,8 MPa (8 bar);
c) design pressure for pressurized parts at least 1,1 times the maximum allowable pressure;
d) the minimum test pressure for pressurized parts shall be 1,50 times the design pressure.
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6 Actuator performance data
6.1 Minimum moving pressure
For double acting actuators, the minimum moving pressure, at no load condition and ambient
temperature, shall be made available by the manufacturer/supplier upon request.
For single acting actuators, the minimum starting and release pressure in contrast to the spring at the
beginning and ending of the nominal stroke, at no load condition and ambient temperature, shall be made
available by manufacturer/supplier upon request.
6.2 Operating time
The actuator manufacturer/supplier shall state the minimum operating time in both directions, without
external load, at nominal pressure and without any significant external restriction on supply flow rate
and exhaust.
6.3 Displacement volume
Internal actuator displaced volumes for each direction, including the dead volumes, for the maximum
stroke without any external limitation
Displacement volume should be expressed in litres.
7 Basic design requirements
7.1 Safety requirements
Actuators shall be designed to take into account the technical principles and specifications for safety.
The design of spring return actuators shall permit the safe assembly/disassembly, when complying with
the manufacturer/supplier’s instructions.
Provisions shall be taken to avoid that the pressure within the spring enclosure exceeds 0,05 MPa
(0,50 bar) during the actuator operation if the spring is not located in a pressurized enclosure.
7.2 Actuator attachment
Attachment for part-turn actuators as per EN ISO 5211.
7.3 Angular stroke
Standard angular stroke for part-turn actuators shall be 90°.
For part-turn actuators, without adjustable end-stops, the standard tolerance on 90° angular stroke shall
be 0°/+2° for each end of stroke.
For part-turn actuators, with adjustable end-stop in one or both directions, the adjustment range referred
to 90° angular stroke shall be stated by the manufacturer/supplier but at least not less than ± 3° for each
end where adjustable stroke is provided.
Tolerances on adjustment for any other angular strokes, within the limit of one revolution, are subject to
agreement between the manufacturer/supplier and purchaser.
7.4 Endurance of part-turn actuators
The actuator shall be designed to guarantee a minimum endurance, without maintenance, in accordance
with values given in Table 1; minimum endurance shall be demonstrated by a suitable test.
For double acting actuators the endurance test shall be performed at a load, along the complete stroke,
of at least 60 % of the minimum run torque developed with 0,55 MPa (5,5 bar) nominal supply pressure.
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For single acting actuators the endurance test shall be performed at a load, along the complete stroke, of
at least 60 % of the minimum value between the minimum air run torque at 0,55 MPa (5,5 bar) nominal
supply pressure and the minimum spring run torque.
Number of cycles and stroking time for the endurance test shall be selected from Table 1 considering the
range of rated torque (4.1) where the actuator under test falls.
Test endurance shall be performed in accordance with the procedure detailed in Annex A.
Table 1 — Endurance test parameters
a
Minimum number of Maximum stroking time (s) for
Rated torque (Nm)
b
testing based on 90° angular stroke
cycles
X
≤ 125 500 000 3
> 125 to ≤ 1 000 250 000 5
> 1 000 to ≤ 2 000 100 000 8
> 2 000 to ≤ 8 000 50 000 12
> 8 000 to ≤ 16 000 25 000 15
> 16 000 to ≤ 32 000 12 500 20
> 32 000 to ≤ 63 000 5 000 30
> 63 000 to ≤ 125 000 3 200 45
> 125 000 to ≤ 250 000 1 600 60
a
Range of rated torques based on EN ISO 5211.
b
Number of cycles based on On-Off duty version; for On-Off duty version one cycle consists of
nominal 90° angular travel in both direction (i.e. 90° to open + 90° to close). For Modulating
control duty version, the number of cycles, the angular travel and the moving speed for the
endurance test shall be agreed between the purchaser and manufacturer/supplier. For angular
travel other than 90° the endurance parameters shall be agreed between the purchaser and
manufacturer/supplier.
7.5 Leakage
A leakage detection test shall be carried out on static condition, at both end of stroke for double acting
version and with spring compressed for single acting version, on the whole pressure retaining parts of
the actuator.
The test pressure value shall be at 1,1 times the maximum allowable pressure, with a minimum 0,55 MPa
(5,5 bar).
The minimum duration shall be:
a) 30 s for displacement volumes up to and including 10 l;
b) 60 s for displacement volumes up to and including 100 l;
c) 120 s for displacement volumes above 100 l.
The actuator shall have no visible external leakage for the duration of the test.
Specific procedure to perform this test, even with ancillaries if any, including the percentage of tested
units for mass production, shall be established by the manufacturer/supplier.
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7.6 Environmental conditions
7.6.1 Ambient temperature
The actuator shall be designed for operation at an ambient temperature range between – 20°C and
+ 60°C, unless otherwise agreed between the manufacturer/supplier and purchaser.
7.6.2 Enclosure protection
The non-pressure retaining compartments of the actuator shall have a base degree of protection at least
IP 65 according to EN 60529 (excluding the exhaust port); for temporary immersion application the
degree of protection shall be at least IP 65/IP 68 according to EN 60529.
7.6.3 Corrosion protection
Actuators shall be protected against external corrosion by proper surface treatment and/or special
material selection. The actuator manufacturer/supplier shall specify in the technical documentation the
corrosion category, according to Table 2.
Table 2 — Environmental corrosion categories
Typical environments
Corrosion category
Exterior Interior
Atmospheres with low level of Unheated buildings where
C2 (low) pollution. Mostly rural areas. condensation could occur, e.g.
depots, sport halls.
Urban and industrial atmospheres, Production rooms with high
moderate sulphur dioxide pollution. humidity and some air pollution,
C3 (medium)
e.g. food-processing plants,
Coastal areas with low salinity.
laundries, breweries, diaries.
Industrial areas and coastal areas with Chemical plants, swimming pools,
C4 (high)
moderate salinity. coastal ship- and boatyards.
Industrial areas with high humidity and Buildings or areas with almost
C5 (very high) aggressive atmosphere and coastal permanent condensation and
areas with high salinity. with high pollution.
Offshore areas with high salinity and Industrial areas with extreme
industrial areas with extreme humidity humidity and aggressive
CX (extreme)
and aggressive atmosphere and atmosphere.
subtropical and tropical atmospheres.
Categories for water and soil
Category Examples of environments and structures
Im 1 (Immersed in River installations, hydro-electric power plants
fresh water)
Im 2 (Immersed in sea Immersed structures without cathodic protection (e.g. harbour areas with
or brackish water) structures luic gates, locks or jetties)
Im 3 (soil) Burried tanks, steel piles, steel pipes
Im 4 (Immersed in sea
Immersed structures without cathodic protection (off shore structures)
or brackish water)
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Table 5 is based on EN ISO 12944-2. The actuator corrosion protection may also be achieved by
systems/methods which deviate from those specified in EN ISO 12944-5.
Table 5 may be used to define the corrosion category in order to help the actuator manufacturers to
define the surface treatment for corrosion protection. Test assessment and test procedures are the
responsibility of the manufacturer.
7.7 Pressure connections
7.7.1 General
Unless otherwise specified the actuators shall have at least one pressure connection for each chamber of
cylinder, to supply or exhaust the pressure. For single acting versions one of the two connections is
considered the exhaust of the non-active chamber of cylinder.
Connections shall be clearly identified with numbers (2 and 4), in accordance with ISO 5599-2, or using
a manufacturer/supplier identification method clearly described in the installation instructions.
When pressurized, direction of movement shall be in accordance with Table 3, unless otherwise specified.
Table 3 — Identification of the pressure connections
 Connection 2 (ISO 5599-2) Connection 4 (ISO 5599-2)
Direction of rotation (when
viewed from the top of the Counter-clockwise Clockwise
actuator interface)
7.7.2 Remotely mounted pilot valves
The recommended dimensions of the pressure connections are specified in Figure 1 and Table 4.
The position, orientation, dimension and form of the pressure connections shall be established by the
manufacturer/supplier and properly identified in the installation instructions.
The actuator shall be properly marked to indicate the form and dimension of thread.

Figure 1 — Dimensions of pressure connections for remotely mounted pilot valves
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Table 4 — Recommended dimensions of the pressure connections for remotely mounted pilot
valves
b c
Displacement
Diameter D4 (min
...