oSIST prEN 14601:2023
(Main)Railway applications - Straight and angled end cocks for brake pipe and main reservoir pipe
Railway applications - Straight and angled end cocks for brake pipe and main reservoir pipe
This document is applicable to manually operated end cocks designed to cut-off the brake pipe and the main reservoir pipe of the air brake and compressed air system of rail vehicles, without taking the type of vehicles and track-gauge into consideration.
This document specifies requirements for the design, dimensions, testing and certification (qualification and/or homologation), and marking.
Bahnanwendungen - Gerade und abgewinkelte Luftabsperrhähne für die Hauptluftleitung und Hauptbehälterleitung
Applications ferroviaires - Robinets d'arrêt droit ou coudé pour conduite générale de frein et conduite principale
Železniške naprave - Ravne in kotne zaporne pipe za zavorne in glavne zračne vode
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 14601:2023
01-april-2023
Železniške naprave - Ravne in kotne zaporne pipe za zavorne in glavne zračne
vode
Railway applications - Straight and angled end cocks for brake pipe and main reservoir
pipe
Bahnanwendungen - Gerade und abgewinkelte Luftabsperrhähne für die Hauptluftleitung
und Hauptbehälterleitung
Applications ferroviaires - Robinets d'arrêt droit ou coudé pour conduite générale de frein
et conduite principale
Ta slovenski standard je istoveten z: prEN 14601
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
oSIST prEN 14601:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14601:2023
DRAFT
EUROPEAN STANDARD
prEN 14601
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2023
ICS 45.060.01 Will supersede EN 14601:2005+A2:2021
English Version
Railway applications - Straight and angled end cocks for
brake pipe and main reservoir pipe
Applications ferroviaires - Robinets d'arrêt droit ou Bahnanwendungen - Gerade und abgewinkelte
coudé pour conduite générale de frein et conduite Luftabsperrhähne für die Hauptluftleitung und
principale Hauptbehälterleitung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14601:2023 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 Requirements . 10
4.1 Operating conditions . 10
4.2 Functional characteristics . 11
4.2.1 General. 11
4.2.2 Open and closed positions . 11
4.2.3 Lubrication . 11
4.2.4 Venting port . 11
4.2.5 Torque. 11
4.2.6 Spindle handle of the end cock . 11
4.2.7 Fall time . 12
4.2.8 Leakage . 12
4.2.9 Vacuum withstanding . 12
4.2.10 Pneumatic shocks . 12
4.3 Constructional characteristics . 13
4.3.1 External appearance . 13
4.3.2 Connections . 13
4.3.3 Space envelope . 13
4.3.4 Mechanical shocks . 13
4.3.5 Resistance to torque . 13
4.3.6 Life expectancy . 13
5 Type test methods . 13
5.1 Sampling for type test . 13
5.2 Test requirements . 13
5.3 Test procedure . 14
5.3.1 Principle . 14
5.3.2 Check of physical and geometrical characteristics . 14
5.3.3 Measurement of the operating torque . 15
5.3.4 Measurement of the pressure fall time . 15
5.3.5 Hydraulic test (water pressure) of the end cock body at given pressure . 17
5.3.6 Operating test under air flow condition . 17
5.3.7 Pneumatic test of the isolating device at given pressures and temperatures . 18
5.3.8 Endurance at ambient temperature with reduced air flow . 20
5.3.9 Measurement of the operating torque drift . 21
5.3.10 Vibration test . 21
5.3.11 Resistance to shock test . 22
5.3.12 Vacuum test . 22
5.3.13 Corrosion test . 23
5.3.14 Resistance to torque . 23
5.3.15 Examination . 24
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5.4 Approval validity . 24
5.5 Type test report . 25
6 Homologation . 25
6.1 General . 25
6.1.1 Procedure . 25
6.1.2 Pass/fail criteria . 25
6.2 Homologation test report . 26
7 Routine tests . 26
8 Designation . 26
9 Marking . 26
Annex A (normative) Dimensions of end cocks . 27
Bibliography . 31
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European foreword
This document (prEN 14601:2023) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14601:2005+A2:2021.
prEN 14601:2023 includes the following significant technical changes with respect to
EN 14601:2005+A2:2021:
— normative references have been updated;
— tested end cock numbers in Table 1 “Operations to carry out for qualification” have been
supplemented for 5.3.7;
— in 5.3.7 “Pneumatic test of the isolating device at given pressures and temperatures” a new time
requirement for performance of the test has been added.
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1 Scope
This document is applicable to manually operated end cocks designed to cut-off the brake pipe and the
main reservoir pipe of the air brake and compressed air system of rail vehicles; without taking the type
of vehicles and track-gauge into consideration.
This document specifies requirements for the design, dimensions, testing and certification (qualification
and/or homologation), and marking.
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 50125-1:2014, Railway applications - Environmental conditions for equipment - Part 1: Rolling stock
and on-board equipment
EN 61373:2010, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:1999)
EN ISO 1179-1:2013, Connections for general use and fluid power — Ports and stud ends with ISO 228-1
threads with elastomeric or metal-to-metal sealing — Part 1: Threaded ports
EN ISO 9227:2022, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227:2022)
ISO 4975:2022, Railway applications — Braking system — Quality of compressed air for pneumatic
apparatus and systems
ISO 5208:2015, Industrial valves — Pressure testing of valves
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology 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/
3.1.1
end cock
two position, three way cock, with no piped vent and, with a rotary spindle moved by the operating
handle
3.2
components
3.2.1
port
terminus of a fluid passage in a component (to which pipelines can be connected) for the transmission
of fluid to, or from the component
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3.2.1.1
venting port
port which provides passage to atmosphere
3.2.1.2
outlet port
port which is vented to atmosphere when the cock is closed
3.2.1.3
inlet port
port which is not vented when the cock is closed
3.2.1.4
threaded port
port arranged to accept screw threaded connection
3.2.2
direction of rotation
direction of rotation quoted as viewed looking at the handle side
3.2.3
mechanical detent
spring arrangement to retain moving parts in open or closed position and only able to be moved to
another position with the specified force
3.2.4
latch
mechanical device to retain moving parts in open or closed position which can only be moved when the
latch is released
3.3
types of end cocks
3.3.1
design
3.3.1.1
straight end cock
cock with axis of inlet and outlet ports in line
Note 1 to entry: See Figure 1.
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Figure 1 — Straight end cock
3.3.1.2
angled end cock
cock with axis of outlet port at an angle of (35 ± 2)° with axis of inlet port
Note 1 to entry: See Figure 2.
Figure 2 — Angled end cock
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3.3.2
location of the handle
3.3.2.1
right hand end cock
handle located at the right hand side of the end cock with the handle closed in a vertically upwards
position
Note 1 to entry: The end cock is opened by rotating the handle in an anticlockwise direction (see Figure 3).
Note 2 to entry: Standard mounting position. Other positions of handle are defined by drawing (see Figure 3).
Key
1 closed position
2 open position
3 outlet port
4 inlet port
Figure 3 — Right hand end cock
3.3.2.2
left hand end cock
handle located at the left hand side of the cock with the handle closed is in a vertically upwards position
Note 1 to entry: The cock is opened by rotating the handle in a clockwise direction (see Figure 4).
Note 2 to entry: Standard mounting position. Other positions of handle are defined by drawing (see Figure 4).
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Key
1 closed position
2 open position
3 outlet port
4 inlet port
Figure 4 — Left hand end cock
3.4
states
3.4.1
closed position
position of the valve component part in which the flow path between inlet and outlet ports is closed and
the venting passage is open and connected to the hose and coupling side of the cock
Note 1 to entry: The cock handle is closed in the vertically upwards position on the vehicle.
Note 2 to entry: The purchaser will define the angle between the cock inlet port axis and the vertically upwards
handle position for cocks not mounted horizontally.
3.4.2
open position
position of the valve member in which the flow path between inlet and outlet ports is fully open, and the
venting passage is closed
3.4.3
fall time
time taken in a device for a quantity of air to fall from a specified high pressure level down to a specified
lower pressure level
Note 1 to entry: Parameter used to define the fluid characteristic of the cock.
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3.4.4
proof pressure
test pressure, in excess of a maximum rated pressure, which causes no malfunction or permanent
deformation damage
3.5
temperature range
range of the temperature within which the apparatus can operate satisfactorily
3.6
leakage
3.6.1
external leakage
leakage of the fluid contained in the end cock to atmosphere
3.6.2
internal leakage
leakage of the fluid contained in the end cock from one side to the other side with the valve component
part in the closed position
3.7
drift
change or variation of a condition with time under steady state operating conditions
3.8
life expectancy
predicted working period during which a component or system will maintain a specified level of
performance under specified conditions
Note 1 to entry: Sometimes expressed in statistical term as a probability.
4 Requirements
4.1 Operating conditions
The end cock shall be able to function under the following conditions:
a) where the compressed air purity not better than “compressed air purity (ISO 4975) 4 – 4 – X [-
40 °C; +35 °C]” in accordance with ISO 4975:2022. This requirement is verified when tests are
carried out in accordance with 5.2;
b) in the temperature range for the environmental conditions to which the rail vehicle is submitted
during its operation and at least for a temperature range defined by the class T2 of
EN 50125-1:2014. The purchaser can specify a higher temperature value if operational constraints
demand it. This requirement is tested in accordance with 5.3.3, 5.3.7 and 5.3.12;
c) the end cock shall withstand the external corrosion due to normal atmospheric pollutants as
specified in EN 50125-1:2014. The end cock is tested in accordance with the test shown in 5.3.13;
d) in the vibrational environment of the rail vehicle on which it is mounted and it shall remain in
either the open or closed position. The cock shall be tested in accordance with 5.3.10.
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4.2 Functional characteristics
4.2.1 General
The operating handle of the end cock shall be equipped with a detent or latch system.
The requirements given in 4.2.2 to 4.2.10 are defined to ensure the air flow through the brake pipe and
main reservoir pipe and ensure no malfunction of the cock after the brake pipe test (as part of the brake
test before the trains start).
4.2.2 Open and closed positions
The handle position shall be the same on any vehicle, so the opening and closing of the cock shall be
achieved by turning its spindle through a minimum of 90° and not more than 100°. Stops shall be
provided at the extremes of rotation, so that the open and closed positions are achieved positively. The
open and closed positions are defined in 3.4.1 and 3.4.2.
4.2.3 Lubrication
It shall be possible to operate the end cock at all pressures without additional lubrication.
4.2.4 Venting port
2
The end cock shall incorporate a venting port with a minimum area of 80 mm , arranged so that when
the cock is closed the compressed air from the coupling hose end of the cock (outlet port connected to
the next vehicle) can be exhausted to atmosphere. Venting shall have commenced when the operation
of the end cock has reduced the cross-sectional area of the bore of the end cock by one third. The
venting port shall not be able to be obstructed when the cock is mounted on the rail vehicle.
The venting port shall be designed and arranged such that the under usual operation, the operating
personnel are not endangered by the exhaust-flow, or objects carried by it, nor by excessive noise level.
4.2.5 Torque
All end cocks with mechanical detent, or with latch engaged shall not be operated by vibration or
shocks. The end cock shall be capable of manual operation therefore the operating torque of the handle
shall be in the range of 9 Nm to 20 Nm for end cocks with detent and a maximum of 6 Nm for cocks with
latch. The torque is tested in accordance with 5.3.3. Torque drifts shall not be allowed. This requirement
is tested in accordance with 5.3.9.
4.2.6 Spindle handle of the end cock
Where the handle is detachable and the unique angular relationship between it and the spindle is not
constructionally ensured, it shall not be possible to assemble the handle to the spindle except where the
axis of the handle and the diametrical spindle mark are aligned and the spindle shall be marked in
accordance with Figure 5 or as otherwise specified by the purchaser. The relative position of the handle
and spindle, when assembled, shall be maintained under all operating and environmental conditions.
The notch in accordance with Figure 5 indicates the position of the spindle (open/closed).
Detachable handles and the spindle should be designed in such a way that an unambiguous angular
relationship between handle and spindle will remain.
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Dimensions in millimetres
Figure 5 — Marking on end of the spindle
4.2.7 Fall time
The air passages shall be designed to minimize the air flow losses within the cock and the cross-
sectional area shall not be smaller than the cross-sectional area of a plain pipe of 25 mm internal
diameter. The pressure fall time should not be longer than that for an equivalent pipe of the same
nominal diameter, as tested in 5.3.4.
4.2.8 Leakage
The sealing arrangement within the end cock shall prevent any unacceptable loss of air. The allowable
loss of air shall be less than the leakage values when tested in accordance with 5.3.7.
4.2.9 Vacuum withstanding
If a vacuum withstand is required, the end cock shall be able to function with a pressure of 0,75 bar
below atmospheric pressure. The leakage is tested in accordance with 5.3.12.
4.2.10 Pneumatic shocks
The components shall be able to resist the pneumatic shocks to which the cock is subject when opening
quickly. This requirement is tested in accordance with 5.3.6.
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4.3 Constructional characteristics
4.3.1 External appearance
The external surfaces of the end cock shall be free of sharp edges which could be a danger to those
persons handling the cock or to other equipment in the proximity of the end cock. This requirement
shall be checked while testing the other constructional features in accordance with 5.3.2.
The end cocks of the brake pipe should be in a red colour and the end cocks of the main reservoir pipe
should be in a light (e.g. yellow, white) colour.
4.3.2 Connections
The body of the end cock shall have an internal thread G1” or G1”1/4 – EN ISO 1179-1, for connection to
the brake or reservoir pipe. The end of the body adjacent to the internal threads shall be of hexagonal
form or have flats (see Annex A). If required, the body end can have a flat sealing face for “flange” type
of connections. The body of the end cock shall have an external thread for connection to the coupling
hose in accordance with Annex A, and checked in accordance with 5.3.2.
4.3.3 Space envelope
The end cock shall be contained in the space envelope in Annex A. Sizes are checked in accordance with
5.3.2.
The cock handle shall be designed according to ergonomic principles taking into account, that the
operator wears protective gloves. There shall be enough space between the handle and the vent
housing to prevent risk of crushing.
4.3.4 Mechanical shocks
The end cock body shall withstand a mechanical shock with an energy value equal to 120 J. This
characteristic is tested in accordance with 5.3.11.
4.3.5 Resistance to torque
When a torque of 200 N∙m is applied to the handle, no permanent deformation shall occur to any part of
the end cock. This requirement is tested in accordance with 5.3.14.
4.3.6 Life expectancy
The life expectancy shall be such that the end cock is able to function satisfactorily after 10 000 cycles in
accordance with 5.3.8.
5 Type test methods
5.1 Sampling for type test
For the type test, a sample of ten end cocks produced under the condition of series production shall be
tested.
5.2 Test requirements
All the type tests shall be performed at +20 °C ± 5 °C and the quality of the compressed air equivalent to
class 4-4-X specified in ISO 4975:2022. All pressures quoted are gauge pressures, not absolute
a
pressures. The tests marked with footnote “ ” shall be performed additionally at T2 specified in
EN 50125-1:2014 and at a wider temperature range if otherwise agreed between purchaser and
supplier (pass/fail criteria for this case shall be agreed between purchaser and supplier).
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5.3 Test procedure
5.3.1 Principle
The tests shall be carried out in the order shown in Table 1. This table is designed to avoid unnecessary
test repetitions.
Table 1 — Operations to carry out for qualification
Tests Corresponding Tested end cock number
subclauses of this
document
1 2 3 4 5 6 7 8 9 10
Physical and geometrical
5.3.2 X X X X X X X X X X
characteristics
Measurement of the fall time 5.3.4 X
Hydraulic test (water pressure) 5.3.5 X
Vibration 5.3.10 X
Resistance to shock test 5.3.11 X
Measurement of the operating torque 5.3.3 X X X X
Measurement of the torque drift 5.3.9 X X X X
a a
Pneumatic test of the isolating device 5.3.7 X X X X X X
Endurance 5.3.8 X
Operating test with flow 5.3.6 X X X
a
Measurement of the operating torque 5.3.3 X X
a
Pneumatic test of the isolating device 5.3.7 X X X X X
a
Vacuum test 5.3.12 X
Corrosion test 5.3.13 X
Resistance to torque 5.3.14 X
Examination 5.3.15 X X
a
Tests shall be performed at 20 °C ± 5 °C and extreme temperatures.
5.3.2 Check of physical and geometrical characteristics
5.3.2.1 Procedure
The requirement of 4.2.1, 4.2.2 and 4.2.3 4.2.5, shall be checked using appropriate measuring
instruments, in accordance with the specification. Unless specified in the text the threaded parts shall
be checked by GO/NO-GO gauges.
5.3.2.2 Pass/fail criteria
The result shall be satisfactory if all the specified characteristics are met.
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5.3.3 Measurement of the operating torque
5.3.3.1 Procedure
The operating torque is measured with a torque wrench, which can be equipped with extensometric
gauges connected to reading equipment. The value of the torque is taken into consideration after four
cycles “open – closed – open”. The duration of one cycle is 2 s. The test shall be carried out with
temperature of –40 °C, +20 °C, +35 °C, or other specified extreme temperatures successively without
0
test pressure and with static pressure of 10 bar.
−0,5
5.3.3.2 Pass/fail criteria
The torque value shall be in accordance with 4.3.5.
5.3.4 Measurement of the pressure fall time
5.3.
...
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