Thermostatic radiator valves - Requirements and test methods

This European Standard specifies definitions, requirements and test methods for thermostatic radiator valves (referred to hereafter as thermostatic valves).
This standard applies to two port thermostatic valves with or without pre-setting facility for fitting to radiators in wet central heating installations up to a water temperature of 120 °C and a nominal pressure of PN 10.
This standard further specifies the dimensions, the materials and the connection details of four series of straight and angle pattern thermostatic radiator valves of nominal pressure  inferior or equal to PN 10.
This standard can be used as reference in a CEN/CENELEC Certification Mark System on thermostatic radiator valves.

Thermostatische Heizkörperventile - Anforderungen und Prüfung

Dieses Dokument hat den Zweck, Begriffe, Anforderungen und Prüfungen für thermostatische Heizkörper¬ventile, nachstehend Thermostatventile genannt, festzulegen.
Die vorliegende Norm ist auf thermostatische Zweiwegeventile mit oder ohne Voreinstellung und integrierte Thermostatventile mit oder ohne Voreinstellung anzuwenden, die zur Ausrüstung von Heizkörpern in Warmwasserheizungen bis zu einer Temperatur von 120 °C und bis zu einem Nenndruck von PN 10 dienen.
Die vorliegende Norm legt ferner die Maße, Werkstoffe und Ausführungen des Anschlusses von vier Reihen von thermostatischen Heizkörperventilen in Durchgangs  und Eckform mit Nenndruck ≤ PN 10 fest.
Auf diese Norm kann in einem CEN/CENELEC Zertifizierungssystem für thermostatische Heizkörperventile Bezug genommen werden.

Robinets thermostatiques d'équipement du corps de chauffe - Exigences et méthodes d'essai

Le présent document spécifie les définitions, les exigences et les méthodes d’essai applicables aux robinets thermostatiques d’équipement du corps de chauffe, ci-après dénommés « robinets thermostatiques ».
La présente norme s’applique aux robinets thermostatiques à deux voies avec ou sans dispositif de pré-réglage et aux robinets thermostatiques intégrés avec ou sans dispositif de pré-réglage destinés à une adaptation sur corps de chauffe dans des installations de chauffage central à eau avec une température d’eau allant jusqu’à 120 °C et une pression nominale allant jusqu’à PN 10.
La présente norme spécifie en outre les dimensions, les matériaux et les détails concernant le raccordement de quatre séries de robinets thermostatiques d’équipement du corps de chauffe droits et d’équerre présentant une pression nominale ≤ PN 10.
La présente norme peut être utilisée comme référence pour un Système de marques de certification CEN/CENELEC sur robinets thermostatiques d’équipement du corps de chauffe.

Termostatski ventili za ogrevala - Zahteve in preskusne metode

Ta evropski standard določa opredelitve, zahteve in preskusne metode za termostatske ventile za ogrevala (v nadaljevanju »termostatski ventili«). Ta standard se uporablja za termostatske ventile z dvema odcepoma ter z možnostjo vnaprejšnje nastavitve za namestitev na ogrevala v sistemih centralnega ogrevanja s temperaturo vode do 120 °C in nazivnim tlakom PN 10 (oziroma brez nje). Ta standard podrobneje določa dimenzije, materiale in podatke za priključitev štirih sklopov ravnih in kotnih termostatskih ventilov za ogrevala z nazivnim tlakom, ki je nižji oziroma enak PN 10. Na ta standard se je mogoče sklicevati v sistemu certifikacijskih oznak CEN/CENELEC v zvezi s termostatskimi ventili za ogrevala.

General Information

Status
Published
Public Enquiry End Date
04-Nov-2018
Publication Date
06-Nov-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Oct-2019
Due Date
14-Dec-2019
Completion Date
07-Nov-2019

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SLOVENSKI STANDARD
SIST EN 215:2019
01-december-2019
Nadomešča:
SIST EN 215:2004
SIST EN 215:2004/A1:2006
Termostatski ventili za ogrevala - Zahteve in preskusne metode
Thermostatic radiator valves - Requirements and test methods
Thermostatische Heizkörperventile - Anforderungen und Prüfung

Robinets thermostatiques d'équipement du corps de chauffe - Exigences et méthodes

d'essai
Ta slovenski standard je istoveten z: EN 215:2019
ICS:
23.060.01 Ventili na splošno Valves in general
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 215:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 215:2019
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SIST EN 215:2019
EN 215
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 91.140.10 Supersedes EN 215:2004
English Version
Thermostatic radiator valves - Requirements and test
methods

Robinets thermostatiques d'équipement du corps de Thermostatische Heizkörperventile - Anforderungen

chauffe - Exigences et méthodes d'essai und Prüfung
This European Standard was approved by CEN on 29 July 2019.

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. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 215:2019 E

worldwide for CEN national Members.
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EN 215:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Symbols and abbreviations ...................................................................................................................... 14

5 Requirements ................................................................................................................................................ 14

5.1 Dimensions ..................................................................................................................................................... 14

5.2 Mechanical properties ................................................................................................................................ 14

5.2.1 Resistance to pressure, leak-tightness of the valve body assembly .......................................... 14

5.2.2 Leak-tightness of the stem seal ............................................................................................................... 14

5.2.3 Resistance of the valve body assembly to a bending moment ..................................................... 14

5.2.4 Resistance of the temperature selector to a torque ........................................................................ 15

5.2.5 Resistance of the temperature selector to a bending moment .................................................... 15

5.2.6 Exchange of the stem seal.......................................................................................................................... 15

5.3 Operating characteristics .......................................................................................................................... 15

5.3.1 Nominal flow rate and flow rate at S-1 K ............................................................................................. 15

5.3.2 Characteristic flow rate at the minimum and maximum setting of the temperature

selector ............................................................................................................................................................ 15

5.3.3 Characteristic flow rate for thermostatic valves having a pre-setting facility....................... 15

5.3.4 Sensor temperature at the minimum and maximum setting of the temperature

selector ............................................................................................................................................................ 15

5.3.5 Hysteresis at the nominal flow rate ....................................................................................................... 15

5.3.6 Differential pressure influence ............................................................................................................... 15

5.3.7 Influence of the static pressure ............................................................................................................... 16

5.3.8 Temperature difference between temperature point S and the closing and opening

temperature respectively ......................................................................................................................... 16

5.3.9 Influence of ambient temperature on thermostatic valves with transmission

elements .......................................................................................................................................................... 16

5.3.10 Water temperature effect.......................................................................................................................... 16

5.3.11 Response time ............................................................................................................................................... 16

5.4 Endurance and temperature resistance .............................................................................................. 16

5.4.1 Mechanical endurance ............................................................................................................................... 16

5.4.2 Thermal endurance ..................................................................................................................................... 16

5.4.3 Temperature resistance ............................................................................................................................ 16

6 Test apparatus and methods ................................................................................................................... 17

6.1 Test apparatus............................................................................................................................................... 17

6.1.1 Apparatus to obtain the hydraulic data ............................................................................................... 17

6.1.2 Apparatus for testing the thermostatic valve and the integrated thermostatic valve

in the water bath .......................................................................................................................................... 18

6.1.3 Apparatus for testing the thermostatic valve in the air stream .................................................. 19

6.2 Characteristic curves of thermostatic valves ..................................................................................... 20

6.2.1 Determination of the characteristic curves ........................................................................................ 20

6.2.2 Plotting of the theoretical curve ............................................................................................................. 23

6.3 Testing of mechanical properties ........................................................................................................... 24

6.3.1 Resistance to pressure, leak-tightness of the valve body assembly .......................................... 24

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6.3.2 Leak-tightness of the valve closed mechanically by means of the protection cap ................ 24

6.3.3 Leak-tightness of the stem seal ................................................................................................................ 25

6.3.4 Resistance of the valve body assembly to a bending moment ..................................................... 25

6.3.5 Resistance of the temperature selector to a torque ......................................................................... 26

6.3.6 Resistance of the temperature selector to a bending moment .................................................... 27

6.4 Testing of operating characteristics ...................................................................................................... 28

6.4.1 Characteristic data ....................................................................................................................................... 28

6.4.2 Endurance tests and temperature resistance test ............................................................................ 31

6.5 Test schedule .................................................................................................................................................. 32

7 Technical information to be published by the manufacturer ...................................................... 33

Annex A (normative) Thermostatic Radiator Valves — Dimensions and details on

connection ....................................................................................................................................................... 36

A.1 General ............................................................................................................................................................. 36

A.2 Dimensions ..................................................................................................................................................... 36

A.3 Connection details ........................................................................................................................................ 39

A.4 Materials for body, tailpiece and nut ..................................................................................................... 40

A.5 Designation ..................................................................................................................................................... 40

A.6 Marking ............................................................................................................................................................ 40

A.7 Calculation of Control Accuracy — CA value ....................................................................................... 40

Annex B (informative) Degree of turbulence of the air current in a room ........................................... 42

Annex C (informative) Test block for thermostatic integrated valves ................................................... 43

Bibliography ................................................................................................................................................................. 44

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SIST EN 215:2019
EN 215:2019 (E)
European foreword

This document (EN 215:2019) has been prepared by Technical Committee CEN/TC 130 “Space heating

appliances without integral heat sources”, the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2020, and conflicting national standards shall

be withdrawn at the latest by March 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 215:2004/A1:2006.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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 the

United Kingdom.
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SIST EN 215:2019
EN 215:2019 (E)
1 Scope

This document specifies definitions, requirements and test methods for thermostatic radiator valves

referred to hereafter as thermostatic valves.

This standard applies to two port thermostatic valves with or without pre-setting facility and

thermostatic integrated valves with or without pre-setting facility for fitting to radiators in wet central

heating installations up to a water temperature of 120 °C and a nominal pressure of PN 10.

This standard further specifies the dimensions, the materials and the connection details of four series of

straight and angle pattern thermostatic radiator valves of nominal pressure ≤ PN 10.

This standard can be used as reference in a CEN/CENELEC Certification Mark System on thermostatic

radiator valves.
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 1982, Copper and copper alloys — Ingots and castings
EN 12164, Copper and copper alloys — Rod for free machining purposes
EN 12168, Copper and copper alloys — Hollow rod for free machining purposes
EN 12420, Copper and copper alloys — Forgings
EN 12449, Copper and copper alloys — Seamless, round tubes for general purposes

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation (ISO 228-1)

ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,

tolerances and designation

ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
thermostatic valve to control the room temperature

thermostatic head assembly and thermostatic valve assembly or the thermostatic integrated valve

assembly
Note 1 to entry: See Figure 1 for components of the thermostatic radiator valve.
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SIST EN 215:2019
EN 215:2019 (E)
Key
A thermostatic head assembly 5 valve seat
B valve body assembly 6 union nut
1 sensor 7 tailpiece
2 temperature selector 8 valve stem
3 temperature selector scale 9 stem seal
4 valve disc 10 flow direction arrow

Figure 1 — Schematic drawing of the assembly of a thermostatic valve with integral sensor

3.1.1
sensor
part of the thermostatic valve to collect the temperature (controlled value)
Note 1 to entry: See Figure 2.
3.1.2
transmission unit

part of the thermostatic valve that converts a change of temperature or pressure of the sensor into a

linear movement of the valve stem
Note 1 to entry: See Figure 2.
3.1.3
transmission element

part of the thermostatic valve (e. g. capillary) that transmits the volume or pressure changes from the

sensor or temperature selector to the transmission unit
Note 1 to entry: See Figure 2.
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EN 215:2019 (E)
3.1.4
thermostatic element
section containing all parts that are filled with the expansion medium

EXAMPLE Sensor, transmission element and transmission unit, shown as cross hatched parts in Figure 2.

Key
1 sensor
2 transmission element
3 transmission unit
Figure 2 — Thermostatic element
3.1.5
protection cap

device that protects the valve stem and thread before the initial fitting of the thermostatic head

assembly
3.2
types of thermostatic head assembly
3.2.1
thermostatic valve with integral sensor

valve where the sensor, transmission unit and temperature selector constitute an assembly which is

incorporated with the valve body assembly
Note 1 to entry: See Figure 3.
Figure 3 — Thermostatic valve with integral sensor
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EN 215:2019 (E)
3.2.2
thermostatic valve with integral temperature selector and with remote sensor

valve where the temperature selector is incorporated within the valve but the sensor is separated from

the transmission unit, and there is a transmission element between the sensor and the transmission

unit
Note 1 to entry: See Figure 4.

Figure 4 — Thermostatic valve with integral temperature selector with remote sensor

3.2.3
thermostatic valve with the remote sensor incorporating the selector

valve where the sensor and temperature selector assembly is mounted remotely from the valve body

assembly and from the transmission unit, and there is a transmission element between the sensor and

the transmission unit
Note 1 to entry: See Figure 5.
Figure 5 — Thermostatic valve with the remote sensor incorporating the selector
3.2.4
thermostatic valve with remote sensor and remote selector

valve where both the sensor and the temperature selector are separate from each other and from the

valve body assembly with transmission unit, and there is a transmission element between the sensor

and the transmission unit and between the temperature selector and the transmission unit

Note 1 to entry: See Figure 6.
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EN 215:2019 (E)
Figure 6 — Thermostatic valve with remote sensor and remote selector
3.2.5
thermostatic valve with pre-setting

valve where a reduced flow rate can be obtained by means of mechanical pre-adjustment incorporated

in the valve body assembly
3.2.6
type of thermostatic integrated valve
embedded valve including valve seat
Note 1 to entry: See Figure 7.
Key
1 garniture
2 integrated valve assembly
3 Sealing element
Figure 7 — Example of valve integrated in a radiator
3.3
types of connections

examples of connections used to fit the valve to the radiator and to the pipe work

Note 1 to entry: See Figure 8.
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SIST EN 215:2019
EN 215:2019 (E)
Key
a) internal pipe thread and cone seated union
b) compression fitting and cone seated union
c) washered union connections
d) compression fittings
e) integrated valve
Figure 8 — Types of radiator valve connections
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SIST EN 215:2019
EN 215:2019 (E)
3.4
operating characteristics
3.4.1
characteristic flow rate
m,s

water flow rate that is obtained at a temperature of point S-2 K, and at a differential pressure of

10 kPa (0,1 bar), at any desired setting
3.4.2
nominal flow rate
m,N

characteristic flow rate for an intermediate setting of the temperature selector according to 6.2.1.3

Note 1 to entry: The nominal flow rate for thermostatic valves having a pre-setting facility is measured at the

maximum pre-setting position.
3.4.3
maximum flow rate
m,max

maximum water flow rate that can be obtained at a differential pressure of 10 kPa (0,1 bar)

3.4.4
hysteresis

temperature difference between the opening and closing curves obtained at the same flow rate

Note 1 to entry: See Figure 9.

Note 2 to entry: If the opening and the closing curves cross each other the value of the hysteresis will be

measured at 1 K P-deviation.
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EN 215:2019 (E)
Key
q flow rate a opening curve S temperature point S
T water bath temperature b closing curve
c theoretical curve
d hysteresis
e closing temperature
f opening temperature
Figure 9 — Explanatory graph of characteristic curves
3.4.5
differential pressure influence

difference between the temperature points S on the theoretical closing curves obtained at different

differential pressures
Note 1 to entry: See Figure 13.
3.4.6
influence of static pressure

temperature difference between two closing curves plotted at different static pressures at the same

flow rate
3.4.7
water temperature effect

difference in sensor temperatures which is equivalent to the flow rate deviation caused by a change of

temperature of the water flowing through the valve
3.4.8

influence of ambient temperature on thermostatic valves with transmission elements

temperature difference obtained at the same flow rate between two opening curves, one recorded with

and one without temperature difference between sensor and transmission unit
Note 1 to entry: Valves according to 3.2.2 to 3.2.4.
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EN 215:2019 (E)
3.4.9
response time
time taken for a change of flow rate after a step-change of air temperature

Note 1 to entry: This change of flow rate corresponds to a pre-determined temperature difference in accordance

with 6.4.1.13.
3.5
technical definitions
3.5.1
sensor temperature
measured temperature of the sensor

Note 1 to entry: In the test it is the same as the temperature of the water bath.

3.5.2
differential pressure
difference of pressure between valve inlet and valve outlet
3.5.3
closing curve and opening curve

curves showing the functions of the water flow versus sensor temperature at constant differential

pressure when the valve is closing and opening respectively and at the same temperature selector

setting
Note 1 to entry: See Figure 9.
3.5.4
closing temperature and opening temperature

sensor temperatures obtained from the closing and opening curves respectively for zero flow

Note 1 to entry: See Figure 9.
3.5.5
theoretical curve

straight line which passes through the points 0,5 q and 0,25 q on the characteristic curve

m,s m,s
Note 1 to entry: Construction shall be according to 6.2.2.
Note 2 to entry: See Figure 9.
3.5.6
temperature point S
point of intersection of the theoretical curve with the abscissa q = 0
Note 1 to entry: According to 6.2.2.
Note 2 to entry: See Figure 9.
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EN 215:2019 (E)
4 Symbols and abbreviations
Table 1 — Symbols and abbreviations
Symbol Explanation Unit
Flow rate kg/h
Nominal flow rate kg/h
m,N
Characteristic flow rate kg/h
m,s
Maximum flow rate kg/h
m,max
q q at maximum setting of the temperature selector
kg/h
m,s,max m,s
q q at minimum setting of the temperature selector
kg/h
m,s,min m,s
m,x1
Auxiliary flow rates for measuring the response time kg/h
m,x2
Sensor temperature which corresponds to the
Ts °C
characteristic flow rate
T T at maximum setting of the temperature selector
s,max s
T T at minimum setting of the temperature selector
s,min s
S Temperature point °C
Δp Differential pressure Pa
K Temperature difference Kelvin
5 Requirements
5.1 Dimensions

Dimensions and connection details for some types of radiator valves are given in Annex A.

5.2 Mechanical properties
5.2.1 Resistance to pressure, leak-tightness of the valve body assembly

During the test according to 6.3.1, there shall be no leak from the connections nor through the wall of

the body.
5.2.2 Leak-tightness of the stem seal
The stem seal shall show no leakage of air during the test according to 6.3.3.
5.2.3 Resistance of the valve body assembly to a bending moment

The valve shall withstand the load according to 6.3.4 without permanent functional impairment, and

shall fulfil the requirements of the subsequent tests.
Permanent deformation shall not be taken into account.
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EN 215:2019 (E)
5.2.4 Resistance of the temperature selector to a torque

No damage or permanent deformation shall be visible after the test according to 6.3.5.

5.2.5 Resistance of the temperature selector to a bending moment

No damage or permanent deformation shall be visible after the test according to 6.3.6.

5.2.6 Exchange of the stem seal

It shall be possible to exchange the stem seal and/or the insert without draining the heating installation

in which the valve is mounted.
5.3 Operating characteristics
5.3.1 Nominal flow rate and flow rate at S-1 K

The nominal flow rate declared by the manufacturer shall not vary by more than 10 % for flow

rates > 33 kg/h and by more than 3 kg/h for flow rates ≤ 33 kg/h from the value determined in the test

specified in 6.4.1.1.

The plotted flow rate S-1 K shall not be more than 70 % of the nominal flow rate. For presettable valves,

the 70 % are only valid for the maximum pre-setting position.

5.3.2 Characteristic flow rate at the minimum and maximum setting of the temperature selector

This flow rate q determined according to 6.4.1.5 shall be within the following ranges:

m,s
— at maximum setting: q ≥ 0,8 q
m,s,max m,N;
— at minimum setting: 1,2 q ≥ q ≥ 0,5 q
m,N m,s,min m,N.

5.3.3 Characteristic flow rate for thermostatic valves having a pre-setting facility

For thermostatic valves having a pre-setting facility, the characteristic flow rate declared by the

manufacturer for an intermediate setting of the temperature selector according to 6.2.1.3 and for each

specified pre-setting position shall not vary by more than the tolerance declared by the manufacturer

from the values determined in the test specified in 6.4.1.3.

5.3.4 Sensor temperature at the minimum and maximum setting of the temperature selector

This sensor temperature T determined according to 6.4.1.6 shall be within the following range:

— 5 °C ≤ T ≤ 32 °C.
5.3.5 Hysteresis at the nominal flow rate

The hysteresis determined according to 6.4.1.7 shall not be greater than 1 K and not exceed the value

declared by the manufacturer by more than 0,2 K.
5.3.6 Differential pressure influence

The differential pressure influence determined according to 6.4.1.8 shall not be greater than 1 K and not

exceed the value declared by the manufacturer by more than 0,3 K.

If the measured value is negative (e.g. in case of opposite flow direction) it shall be documented as

absolute value.
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EN 215:2019 (E)
5.3.7 Influence of the static pressure

The influence of the static pressure determined according to 6.4.1.9 shall not be greater than 1 K.

5.3.8 Temperature difference between temperature point S and the closing and opening

temperature respectively

The temperature difference between temperature point S and the closing and opening temperature

respectively determined according to 6.4.1.10 shall not be greater than 0,8 K.

5.3.9 Influence of ambient temperature on thermostatic valves with transmission elements

The influence of the ambient temperature determined according to 6.4.1.11 shall not be greater

than 1,5 K.
5.3.10 Water temperature effect

The effect that is caused by a change of the temperature of the water flowing through the valve of 30 K

and which is determined according to 6.4.1.12 shall not be greater than:
— 1,5 K for thermostatic valves with the sensor incorporated according to 3.2.1;

— 0,75 K for thermostatic valves with the transmission elements according to 3.2.2 to 3.2.4

and not exceed the value declared by the manufacturer by more than 0,3 K.
5.3.11 Response time

The response time determined according to 6.4.1.13 shall not exceed 40 min and the value declared by

the manufacturer by more than 7 min.
5.4 Endurance and temperature resistance
5.4.1 Mechanical endurance

The values of the sensor temperatures at the nominal flow rate before and after the mechanical

endurance test according to 6.4.2.1 shall not vary by more than 2 K.

The nominal flow rate determined after the mechanical endurance test shall not vary by more

than ± 20 % from that determined before the endurance test.
5.4.2 Thermal endurance
The values of the sensor tem
...

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