SIST EN 15714-6:2022

SLOVENSKI STANDARD
oSIST prEN 15714-6:2021
01-november-2021
Industrijski ventili - Pogoni - 6. del: Hidravlični linearni pogoni za industrijske
ventile - Osnovne zahteve
Industrial valves - Actuators - Part 6: Hydraulic linear actuators for industrial valves -
Basic requirements
Industriearmaturen - Stellantriebe - Teil 6: Hydraulische Linearantriebe - Grundlegende
Anforderungen
Robinetterie industrielle - Actionneurs - Partie 6: Actionneurs linéaires hydrauliques -
Prescriptions de base
Ta slovenski standard je istoveten z: prEN 15714-6
ICS:
23.060.20 Zapirni ventili (kroglasti in Ball and plug valves
pipe)
oSIST prEN 15714-6:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 15714-6:2021

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oSIST prEN 15714-6:2021


DRAFT
EUROPEAN STANDARD
prEN 15714-6
NORME EUROPÉENNE

EUROPÄISCHE NORM

September 2021
ICS 23.060.20
English Version

Industrial valves - Actuators - Part 6: Hydraulic linear
actuators for industrial valves - Basic requirements
Robinetterie industrielle - Actionneurs - Partie 6: Industriearmaturen - Stellantriebe - Teil 6:
Actionneurs linéaires hydrauliques - Prescriptions de Hydraulische Linearantriebe - Grundlegende
base Anforderungen
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 15714-6:2021 E
worldwide for CEN national Members.

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oSIST prEN 15714-6:2021
prEN 15714-6:2021 (E)
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 . 7
4.1.3 Modulating duty . 7
4.2 Action . 7
4.2.1 Double Acting (DA) . 7
4.2.2 Single Acting (SA) . 7
5 Motive energy . 7
5.1 Operating medium. 7
5.2 Quality . 7
5.3 Pressure . 8
5.3.1 General. 8
5.3.2 Maximum allowable pressure (MAP) . 8
5.3.3 Design pressure . 8
5.3.4 Working pressure . 8
5.3.5 Structural test pressure . 8
5.3.6 Minimum moving pressure . 8
6 Actuator basic performances . 9
6.1 Double acting version . 9
6.2 Single acting version . 10
6.3 Displacement volume . 10
6.4 Operating time . 10
7 Basic design requirements . 10
7.1 Safety requirements . 10
7.2 Linear actuator attachment . 11
7.3 Attachments size . 12
7.4 Nominal stroke . 12
7.5 Endurance . 13
7.5.1 General. 13
7.5.2 Double acting version . 13
7.5.3 Single acting version . 13
7.6 Leakage . 13
7.7 Environmental conditions . 14
7.7.1 Ambient temperature. 14
7.7.2 Enclosure protection . 14
7.7.3 Corrosion protection . 14
7.8 Pressure connections . 15
7.8.1 General. 15
7.8.2 Remotely mounted pilot valves . 16
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7.8.3 Direct mounted pilot valves . 17
7.9 Structural safety factors . 17
8 Optional equipment . 18
8.1 Ancillaries . 18
8.2 Manual operation device . 18
8.3 Mechanical end stop adjustment . 18
8.4 Position indicator . 18
8.5 Bracket . 18
8.6 Anti-rotation device . 19
9 Conformity assessment . 19
9.1 General . 19
9.2 Type tests . 19
9.3 Control of production process . 20
10 Marking . 21
10.1 Mandatory requirements . 21
10.2 Optional requirements . 22
11 Documentation . 22
12 Linear actuator selection guidelines . 23
Annex A (normative) Endurance test procedure . 24
A.1 General . 24
A.2 Test equipment. 24
A.3 Test conditions . 24
A.4 Test procedure . 24
A.5 Acceptance criteria . 24
Annex B (informative) Actuator selection guidelines . 26
B.1 General . 26
B.2 Selection parameters . 26
B.2.1 General . 26
B.2.2 Valve questions . 26
B.2.3 Actuator questions . 26
B.2.4 Ancillary questions: . 27
B.2.5 Environmental conditions: . 27
B.3 Actuator selection . 27
Annex C (informative) Guideline to establish the basic performances for single acting
version . 28
C.1 General . 28
C.2 Specific thrusts definitions relevant to the single acting version . 28
C.3 Criteria for performances selection . 28
Bibliography . 30

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oSIST prEN 15714-6:2021
prEN 15714-6:2021 (E)
European foreword
This document (prEN 15714-6:2021) 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.
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1 Scope
This document provides basic requirements for piston type hydraulic linear actuators for industrial
valve, both double acting and single acting, used for on-off and modulating control duties. It includes
criteria, method and guidelines for design, qualification, corrosion protection, control and testing.
It does not apply to hydraulic actuators which are integral parts of control valves. 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.
EN ISO 5210:2017, Industrial valves - Multi-turn valve actuator attachments (ISO 5210:2017)
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)
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
stroke
single and complete movement from one end of travel to the other
3.2
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.
3.3
output thrust
minimum guaranteed output thrust 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 thrust varies with the stroke, in a linear or nonlinear relationship with pressure,
tabulated data and/or thrust versus stroke diagram shall be provided at significant pressure values for each
direction of movement.
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3.3.1 Nominal thrust
3.3.1.1
double acting version
minimum guaranteed output thrust of the actuator, at any point of the stroke, with nominal supply
pressure
Note 1 to entry: See 4.2.1.
3.3.1.2
single acting version
guaranteed output thrust of the actuator with hydraulic nominal supply at the beginning of the stroke in
the direction to compress the spring
Note 1 to entry: See 4.2.2
3.3.2
start thrust
actuator output thrust at the beginning of the stroke in the direction of movement
3.4 Single acting version
3.4.1
Fluid Starting Thrust
AST
output thrust, at defined pressure value, at the beginning of the stroke in opposition to the spring
3.4.2
Fluid Ending Thrust
AET
output thrust, at defined pressure value, at the end of the stroke when spring is at its maximum
compression
3.4.3
Spring Ending Thrust
SET
output thrust generated by the spring at the end of its stroke with no fluid in the cylinder
3.4.4
Spring Starting Thrust
SST
output thrust generated by the spring at its maximum compression with no fluid in the cylinder
3.4.5
Spring Running Thrust
SRT
any output thrust value between SST and SET
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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.
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-versa.
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.
Drive the valve to any position between fully open and fully closed.
5 Motive energy
5.1 Operating medium
The operating medium shall be hydraulic fluid.
The fluid may be used, on agreement between the manufacturer/supplier and purchaser, ensuring it is
designed for pressure and to be compatible with internal actuator parts and with lubricant properties.
The flashpoint shall be of not less than 93 °C for pressures below 10 bar and 157 °C for pressures above
10 bar. The chemical and physical properties of the hydraulic fluid shall be suitable for use with the
materials used in the design of the actuator and its accessories. The hydraulic fluid shall be suitable for
operation of the hydraulic system through the entire temperature range to which it may be subjected in
service.
5.2 Quality
The operating medium shall have a contamination level specified to ISO 4406 class 18/16/13 as a
maximum.
When necessary the actuator shall be properly flushed to guarantee an internal cleanliness consistent
with the above specified contamination level.
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5.3 Pressure
5.3.1 General
As a general information the manufacturer/supplier shall indicate, for each actuator model, the pressure
limits including at least the maximum allowable pressure and working pressure range for a specific
application. Other pressure values shall be available on demand.
5.3.2 Maximum allowable pressure (MAP)
The pressure not to be exceeded for the supply to the hydraulic actuator. Recommended values for
maximum allowable pressure are in Table 1.
Table 1 — Pressure level
 MPa bar psi
PN 50 5,5 55 800
PN 63 10,3 103 1 500
PN 200 20,7 207 3 000
PN 350 34,5 345 5 000
5.3.3 Design pressure
At least 1,1 times the maximum allowable pressure.
5.3.4 Working pressure
The pressure applied to the actuator to guarantee the performances on a specific application.
5.3.5 Structural test pressure
Structural test under pressure value minimum 1,50 times the design pressure for a minimum holding
period 5 min after pressure stabilization.
Structural test under pressure is carried out to validate the capability of the pressure retaining parts of
the actuator to withstand the pressure without permanent deformations.
5.3.6 Minimum moving pressure
The minimum moving pressure required, at ambient temperature, to complete the specified stroke
without external load, starting from not pressurized conditions. This data should be available by the
manufacturer upon on request.
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6 Actuator basic performances
6.1 Double acting version
Table 2 — Double acting selection chart
a
Actuator Standard
Maximum thrust (KN) for specified maximum allowable
b
cylinder
designation pressure (bar)
diameter (mm)
55 103 207 345
L25D 25 2,6 4,9 9,8 16,3
L30D 30 3,7 7,0 14,0 23,4
L40D 40 6,6 12,4 25,0 41,6
L50D 50 10,4 19,4 39,0 65,0
L60D 60 14,9 28,0 56,2 93,6
L70D 70 20,3 38,1 76,5 127,5
L80D 80 26,5 49,7 99,9 166,5
L90D 90 33,6 62,9 126,4 210,7
L100D 100 41,5 77,7 156,1 260,1
L125D 125 64,8 121,3 243,9 406,4
L150D 150 106,2 174,7 351,2 585,3
L200D 200 165,9 310,6 624,3 —
L250D 250 259,2 485,4 — —
L300D 300 373,2 698,9 — —
L350D 350 508,0 — — —
L400D 400 663,5 — — —
a
Maximum thrust is referred to the net piston size without the effect of stem reduction.
b
Preferred size of designation (e.g. L25 D stands for the L = linear, 25 = Cylinder diameter, D = double acting).
NOTE For further sizing information please see Annex B.
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6.2 Single acting version
Table 3 — Double acting selection chart
Actuator Standard cylinder Basic
b a
diameter (mm)
designation performances
L25S 25
L30S 30
L40S 40
L50S 50
L60S 60
L70S 70
L80S 80
L90S 90
—
L100S 100
L125S 125
L150S 150
L200S 200
L250S 250
L300S 300
L350S 350
L400S 400
a
For information regarding basic performances refer to Annex C.
b
Preferred size of designation (e.g. L25D stands for the L = linear,
25 = Cylinder diameter, D = double acting).
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.
6.4 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.
7 Basic design requirements
7.1 Safety requirements
Actuators shall be designed taking into account the technical principles and specifications for safety. For
maintenance purposes the design of the single acting (SA) actuators shall permit the safe disassembly/
reassembly of the whole unit including the spring unit or spring cartridge complying with the
manufacturer/supplier’s instructions.
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7.2 Linear actuator attachment
Dimensions of attachment flange shall be according to EN ISO 5210:2017, Clause 5, Figure 2 and Table 2,
7.6 and Table 8.
Dimensions of output shaft shall be based on EN ISO 5210:2017, 7.6 with specific additional dimensions
according to Figure 1 and Table 4. A flat attach for fork wrench SW shall be provided as optional.

Figure 1 — Dimensions of output drive
Table 4 — Data and dimensions of output drive
sw
Flange type
EN ISO 5210 thrust rating
a
(kN)
EN ISO 5210
mm
F05 10 13
F07 20 17
F10 40 21
F12 70 27
F14 100 36
F16 150 46
F25 200 50
F30 325 55
F35 700 80
a
Different flange and/or coupling type may be used upon agreement between purchaser and
manufacturer/supplier.
The material of the output drive component (Table 4) shall be clearly indicated in the
manufacturer’s/supplier’s documentation.
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7.3 Attachments size
Table 5 — Attachment sizes
Actuator Standard EN ISO 5210 flange based on thrust at Minimum stroke
d a, b c
cylinder
designation maximum allowable pressure (bar) H
diameter
(double/single
(mm)
(mm) 55 103 207 345
acting version)
L25D/L25S 25 F05 F05 F05 F07
L30D/L30S 30 F05 F05 F07 F10
L40D/L40S 40 F05 F07 F10 F12
L50D/L50S 50 F07 F07 F10 F12
L60D/L60S 60 F10 F10 F12 F14
L70D/L70S 70 F10 F10 F14 F16
L80D/L80S 80 F10 F10 F14 F25
Minimum stroke
according to
L90D/L90S 90 F10 F12 F16 F30
EN ISO 5210:2017,
L100D/L100S 100 F12 F14 F25 F30
7.6, Table 8 for
each flange type
L125D/L125S 125 F12 F16 F30 F35
L150D/L150S 150 F14 F25 F35 F35
L200D/L200S 200 F25 F30 F35 —
L250D/L250S 250 F30 F35 — —
L300D/L300S 300 F30 F35 — —
L350D/L350S 350 F35 — — —
L400D/L400S 400 F35 — — —
a
Actuator attachment dimensions according to 7.1.
b
Different flange type may be used upon agreement between purchaser and manufacturer/supplier.
c
Maximum stroke is provided by the manufacturer/supplier.
d
Preferred size of designation (e.g. L25D stands for the L = linear, 25 = Cylinder diameter,

D = double acting).
7.4 Nominal stroke
With respect to the basic performances stated in Clause 6 for each size of cylinder, linear actuator shall
provide an output stem movement, according to paragraph 31, defined by the Manufacturer/supplier in
a tabulated form or based on agreement between the Manufacturer/supplier and purchaser or valve
Manufacturer. The stroke can be limited, around the defined end values, by means of adjustable
mechanical end stops (8.3) in one or both directions of movement.
Linear actuators with adjustable mechanical end stops shall allow the defined stroke with a ± 3 % of
adjustment referred to the set stroke.
Linear actuators without adjustable mechanical end-stops shall be designed to provide the defined
nominal stroke value with a tolerance H15 according to ISO 286-1.
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Different values of tolerances or percentages on end-stops adjustment shall be agreed between the
purchaser and the Manufacturer/supplier.
7.5 Endurance
7.5.1 General
The actuator shall be designed to have an endurance, without maintenance, in accordance with the
criteria given in 7.5.2 and 7.5.3.
Conformity to the endurance requirements shall be proved by a test realized according to Annex A.
7.5.2 Double acting version
Endurance test for the double acting version shall be based on a test thrust at least 60 % of the maximum
value defined in Table 2 with minimum stroke leng
...