SIST EN 161:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Samodejni zaporni ventili za plinske gorilnike in plinske aparateAutomatische Absperrventile für Gasbrenner und GasgeräteRobinets automatiques de sectionnement pour bruleurs a gaz et appareils a gazAutomatic shut-off valves for gas burners and gas appliances27.060.20Plinski gorilnikiGas fuel burners23.060.20Zapirni ventili (kroglasti in pipe)Ball and plug valvesICS:Ta slovenski standard je istoveten z:EN 161:2007SIST EN 161:2007en,fr,de01-september-2007SIST EN 161:2007SLOVENSKI
STANDARDSIST EN 161:2002/dprA1:2007SIST EN 161:20021DGRPHãþD



SIST EN 161:2007



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 161January 2007ICS 23.060.40Supersedes EN 161:2001
English VersionAutomatic shut-off valves for gas burners and gas appliancesRobinets automatiques de sectionnement pour brûleurs àgaz et appareils à gazAutomatische Absperrventile für Gasbrenner undGasgeräteThis European Standard was approved by CEN on 8 December 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 161:2007: ESIST EN 161:2007



EN 161:2007 (E) 2 Contents Page 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Classification.7 5 Units of measurement and test conditions.7 6 Construction requirements.8 7 Performance requirements.13 8 EMC/Electrical requirements.21 9 Marking, installation and operating instructions.22 Annex A (informative)
Gas connections in common use in the various countries.25 Annex B (informative)
Leak-tightness test — volumetric method.26 Annex C (informative)
Leak-tightness test — pressure loss method.27 Annex D (normative)
Conversion of pressure loss into leakage rate.28 Annex E (informative)
Additional requirements coming from EU Directive 97/23/EC.29 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 90/396/EEC.30 Bibliography.32
SIST EN 161:2007



EN 161:2007 (E) 3 Foreword This document (EN 161:2007) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for gas-burners and gas-burning appliances”, the secretariat of which is held by BSI. 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 July 2007, and conflicting national standards shall be withdrawn at the latest by July 2007. This document supersedes EN 161:2001. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This European Standard is intended to be used in conjunction with prEN 13611:2005, Safety and control devices for gas burners and gas-burning appliances — General requirements. This control standard refers to clauses of prEN 13611:2005 or adapting it by stating “Addition”, “Modification” or “Replacement” in the corresponding clause. It introduces requirements for balanced valves and a method for the assessment of other means for closing and/or sealing in automatic shut-off valves. SIL classification according to EN 61508 cannot be claimed based upon compliance with this standard. Valves with SIL classification do not meet automatically the requirements of this standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 161:2007



EN 161:2007 (E) 4 1 Scope This European Standard specifies the safety, construction and performance requirements for automatic shut-off valves for gas burners, gas appliances and similar use, hereafter referred to as valves.
This European Standard covers type testing only. It applies to valves with declared maximum inlet pressures up to and including 5 bar, for use on burners or in appliances using fuel gases of the first, second, and third families. It applies to electrically operated valves and to valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external electrical devices for switching the control signal or actuating energy. An assessment method for valve designs is given by this European Standard. It also applies to valves where the flow rate is controlled by external electrical signals, either in discrete steps or proportional to the applied signal. It also applies to valves fitted with closed position indicator switches. 2 Normative references The following referenced documents are indispensable for the application 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 30 (all parts), Domestic cooking appliances burning gas fuel
EN 298, Automatic gas burner control systems for gas burners and gas burning appliances with or without fans prEN 13611:2005, Safety and control devices for gas burners and gas-burning appliances — General require-ments EN 13906-1, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 1: Compression springs EN 13906-2, Cylindrical helical springs made from round wire and bar — Calculation and design — Part 2: Extension springs EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:1999, modified) EN 61058-1, Switches for appliances - Part 1: General requirements (IEC 61058-1:2000 + A1:2001,
modified) ISO 4400, Fluid power systems and components - Three-pin electrical plug connectors with earth contact - Characteristics and requirements ISO 6952, Fluid power systems and components — Two-pin electrical plug connectors with earth contact –Characteristics and requirements SIST EN 161:2007



EN 161:2007 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in prEN 13611:2005 and the following apply. 3.1 automatic shut-off valve valve which opens when energized and closes automatically when de-energized 3.2 closure member according to prEN 13611:2005, 3.2 3.3 actuating mechanism part of the valve which moves the closure member 3.4 external leak-tightness according to prEN 13611:2005, 3.4 3.5 internal leak-tightness according to prEN 13611:2005, 3.5 3.6 inlet pressure according to prEN 13611:2005, 3.6 3.7 outlet pressure according to prEN 13611:2005, 3.7 3.8 pressure difference according to prEN 13611:2005, 3.8 3.9 maximum inlet pressure according to prEN 13611:2005, 3.9 3.10 minimum inlet pressure according to prEN 13611:2005, 3.10
3.11 flow rate according to prEN 13611:2005, 3.11 3.12 rated flow rate according to prEN 13611:2005, 3.12 3.13 maximum ambient temperature according to prEN 13611:2005, 3.13 SIST EN 161:2007



EN 161:2007 (E) 6 3.14 minimum ambient temperature according to prEN 13611:2005, 3.14 3.15 mounting position according to prEN 13611:2005, 3.15 3.16 valve with step control valve which controls the flow rate in steps 3.17 valve with modulating control valve which controls the flow rate continuously between two limits in response to external electrical signals 3.18 closed position indicator switch switch fitted to a valve which indicates when the closure member is in the closed position 3.19 actuating energy required energy for the actuating mechanism to move the closure member to the open position NOTE The actuating energy can have an external source (electrical, pneumatic or hydraulic) and can be transformed inside the valve. 3.20 opening force force required to move the closure member to the open position 3.21 closing force force available to close the valve, independent of any force provided by fuel gas pressure 3.22 sealing force force acting on the valve seat when the closure member is in the closed position, independent of any force provided by fuel gas pressure 3.23 frictional force largest force required to move the actuating mechanism and the closure member from the open position to the closed position with the closure spring removed, independent of any force provided by fuel gas pressure 3.24 actuating pressure hydraulic or pneumatic pressure supplied to the actuating mechanism of the valve 3.25 opening time time interval between energizing the valve and the attainment of the maximum or other defined flow rate 3.26 closing time time interval between de-energizing the valve and the closure member attaining the closed position SIST EN 161:2007



EN 161:2007 (E) 7 3.27 delay time time interval between energizing the valve and the start of flow 3.28 control valve valve which controls the fluid (e. g. compressed air) supplied to the actuating mechanism 3.29 rated voltage voltage declared by the manufacturer at which the valve may be operated 3.30 rated current current declared by the manufacturer at which the valve may be operated 3.31 balanced valve valve with a balanced closure member where the inlet pressure acts on the closure member in the opening and closing direction NOTE The closure member may close more than one opening. 4 Classification 4.1 Classes of valve  Class A, B and C valves Valves where the sealing force is not decreased by the gas inlet pressure. They are classified A, B or C according to the sealing force requirements of 7.13. Balanced valves according to this standard are class A valves.  Class D valves Valves which are not subject for requirements for the sealing force and fixed closing time. NOTE Class D valves are intended to be used for control functions only.  Class J valves Disc-on-seat valves where the sealing force is not decreased by the gas inlet pressure and which meet the requirements of 7.13. 4.2 Groups of valve According to prEN 13611:2005, 4.2 4.3 Classes of control functions, safety classes According to prEN 13611:2005, 4.3 5 Units of measurement and test conditions According to prEN 13611:2005, Clause 5 SIST EN 161:2007



EN 161:2007 (E) 8 6 Construction requirements 6.1 General According to prEN 13611:2005, 6.1 6.2 Mechanical parts of valves 6.2.1 Appearance According to prEN 13611:2005, 6.2.1 6.2.2 Holes According to prEN 13611:2005, 6.2.2 6.2.3 Breather holes According to prEN 13611:2005, 6.2.3 6.2.4 Test for leakage of breather holes According to prEN 13611:2005, 6.2.4 6.2.5 Screwed fastenings According to prEN 13611:2005, 6.2.5 6.2.6 Jointing According to prEN 13611:2005, 6.2.6 6.2.7 Moving parts According to prEN 13611:2005, 6.2.7 6.2.8 Sealing caps According to prEN 13611:2005, 6.2.8 6.2.9 Dismantling and reassembly According to prEN 13611:2005, 6.2.9 6.2.10 Design There shall be no exposed shafts or operating levers which could adversely affect the ability of valves to close. 6.2.11 Closed position indicator switch Closed position indicator switches, where fitted, shall not impair the correct operation of valves. Adjusters shall be sealed to indicate interference. Any drift of the switch and actuating mechanism from its setting shall not impair correct valve operation. SIST EN 161:2007



EN 161:2007 (E) 9 6.2.12 Valve with modulating control Flow rates of valves with modulating control shall be adjustable over the full range declared by the manufacturer. If the adjustment of one flow rate affects the setting of any other flow rate, this shall be clearly indicated in the manufacturer's instructions for setting up. The setting of any flow rate shall require the use of mechanical or electrical tools and shall be designed to discourage unauthorized adjustment. NOTE For air-gas ratio controls see EN 12067-1 and -2. 6.2.13 Controls assembled to a valve Other controls assembled to a valve shall not interfere with its shut-off function. 6.2.14 Balanced valves The closure member of a balanced valve shall have a resulting force in the closing direction where the sealing force is not decreased by the gas inlet pressure. 6.2.15 Closing and sealing 6.2.15.1 Closing and/or sealing by means of springs If springs are used for closing and/or sealing the valve, they shall be designed to EN 13906-1 or EN 13906-2 for static and dynamic loading. 6.2.15.2 Other means for closing and/or sealing
6.2.15.2.1 General This clause defines a method for the assessment of other means for closing and sealing in automatic shut-off valves. By this clause the term “safety class A, B or C” is not related to the sealing force classes but to the safety classes as described in 4.3. Sealing force of valves shall be classified according to 4.1. The basic risks of fire and explosion in a gas appliance as a result of uncontrolled gas flow requires a safety class C system for the gas shut-off function. This is based on a comparison, made between automatic burner controller and gas shut-off function, the safety class of each of them being considered equal. Although this European Standard is not based on a fault assessment approach as described in 6.6 of prEN 13611:2005, the combination of two automatic shut-off valves is considered equal to safety class C requirement. This assumption is based on the construction and performance requirements of this European Standard. 6.2.15.2.2 New designs for closing and/or sealing New designs for closing and/or sealing shall fulfil at least safety class B requirements. In all cases the gas shut-off function shall be a class C function. NOTE For further information see prEN 14459. During the testing the valve shall fulfil the performance requirements of Clause 7. New designs may consist of a combination of closure members, electronic controller, sensing elements, actuators, lockout and reset. SIST EN 161:2007



EN 161:2007 (E) 10 The manufacturer shall declare the other means for closing and/or sealing. For the assessment of the new design the requirements of this European Standard shall be used in combination with 6.6 of prEN 13611:2005. If this leads to aspects that are not described in this European Standard, the manufacturer shall supply a failure mode analysis on the new design. This analysis shall describe the specific failure modes for the type of technology used in relation to the following basic safety requirements: a) closing function at power interruption; b) leak tightness; c) sealing force (ability to withstand backpressure, to be checked by testing or calculation); d) closing force > friction force; e) closing time including the influence to the Burner Control (EN 298); f) no uncontrolled opening of the automatic shut-off valve. As a result of this failure mode analysis, additional constructional requirements shall be fulfilled and/or additional faults compared to Annex E of prEN 13611:2005 shall be included into the fault assessment. The outcome of the analysis shall provide a set of conditions under which the new design can be used in an automatic shut-off valve. These conditions involve construction requirements, safety requirements, performance requirements and test methods. The fault reaction time shall be declared by the manufacturer. Failure of mechanical parts adversely affecting the performance requirements of this European Standard is considered as an abnormal situation and can therefore be considered as a first fault according to the test method in 6.6 of prEN 13611:2005. However, if mechanical parts are designed according to the constructional requirements of Clause 6 of this European Standard, failure of these parts is not considered. 6.3 Materials 6.3.1 General material requirements According to prEN 13611:2005, 6.3.1 6.3.2 Housing According to prEN 13611:2005, 6.3.2 6.3.3 Test for leakage of housing after removal of non-metallic parts According to prEN 13611:2005, 6.3.3 6.3.4 Zinc alloys According to prEN 13611:2005, 6.3.4 6.3.5 Springs providing closing and/or sealing force According to prEN 13611:2005, 6.3.5 SIST EN 161:2007



EN 161:2007 (E) 11 6.3.6 Resistance to corrosion and surface protection According to prEN 13611:2005, 6.3.6 6.3.7 Impregnation According to prEN 13611:2005, 6.3.7 6.3.8 Seals for glands for moving parts According to prEN 13611:2005, 6.3.8 6.3.9 Closure members Closure members of valves above DN 25 shall either have a mechanical support (e. g. metallic) to withstand the sealing force or shall be made of metal. This requirement also applies to:  all valves with a maximum inlet pressure above 150 mbar;  parts transmitting the closing force. The strength of the connection between closure members of a balanced valve shall be at least five multiplied by the maximum inlet pressure multiplied by the total opening area of the closure members. 6.4 Gas connections 6.4.1 Making connections According to prEN 13611:2005, 6.4.1 6.4.2 Connection sizes According to prEN 13611:2005, 6.4.2 6.4.3 Threads According to prEN 13611:2005, 6.4.3 6.4.4 Union joints According to prEN 13611:2005, 6.4.4 6.4.5 Flanges According to prEN 13611:2005, 6.4.5 6.4.6 Compression fittings According to prEN 13611:2005, 6.4.6 6.4.7 Nipples for pressure test According to prEN 13611:2005, 6.4.7 SIST EN 161:2007



EN 161:2007 (E) 12 Addition: Nipples for pressure test conforming to these requirements shall be used only up to and including 500 mbar. 6.4.8 Strainers According to prEN 13611:2005, 6.4.8 Addition: 6.4.8.1 Where an inlet strainer is fitted to class A, B, C, and D valves, the maximum strainer hole dimension shall not exceed 1,5 mm and it shall prevent the passage of a 1 mm diameter pin gauge. Class J valves shall incorporate an inlet strainer. The maximum strainer hole dimension shall not exceed 0,28 mm and it shall prevent the passage of a 0,2 mm diameter pin gauge. 6.4.8.2 Strainers fitted to valves of DN 25 and above shall be accessible for cleaning or replacement without removing the valve body by dismantling threaded or welded pipework. 6.5 Electronic parts of valves According to prEN 13611:2005, 6.5 6.6 Protection against internal faults for the purpose of functional safety According to prEN 13611:2005, 6.6 6.7 Electrical equipment 6.7.1 Degree of protection The degree of protection shall be declared by the manufacturer in accordance with EN 60529. 6.7.2 Switches Switches shall conform to EN 61058-1. The number of operating cycles shall be in accordance with Table 3 of this European Standard. 6.7.3 Plug connections Valves supplied with an assembled electrical plug connector in accordance with ISO 6952 or ISO 4400 shall have connections to the following pins and to earth:  Single step valves PE earth contact Pin 1 N Pin 2 L  Two step valves Pin 4 (e) earth contact Pin 1 N Pin 2 L step 1 Pin 3 L step 2 SIST EN 161:2007



EN 161:2007 (E) 13  Closed position indicators Pin 4 (e) earth contact Pin 1 common Pin 2 open valve Pin 3 closed valve 6.7.4 Power saving circuits 6.7.4.1 Closing of the valve Valves with power-saving circuits shall be designed such that any fault in the power-saving circuit does not affect the correct closing and the leak-tightness of the valve. If the power-saving circuit has an independent power supply it has to fulfil 6.6.4 of prEN 13611:2005. 6.7.4.2 Overheating If the power-saving circuit meets the requirement of 6.6.4 of prEN 13611:2005 the test under 6.7.4.3 does not apply. 6.7.4.3 Test of power-saving circuits Energize the valve according to 7.1 of this European Standard at maximum rated voltage or current and at maximum ambient temperature for a period of at least 24 h under no flow conditions with the power saving circuit taken out of function. Without de-energizing the valve, slowly reduce the voltage or current to 15 % of the minimum rated value. Verify that the valve has closed and remains tight. 6.8 Pneumatic and hydraulic actuating mechanisms Pneumatically or hydraulically actuated valves shall be provided with protection to ensure that the blockage of an orifice in the control system does not adversely affect the performance requirements as given in Clause 7. 7 Performance requirements 7.1 General According to prEN 13611:2005, 7.1 Addition: Valves shall close automatically when de-energized or in the absence of actuating energy. Valves with DC supplies shall operate correctly from the minimum rated voltage to the maximum rated voltage, as declared by the manufacturer. For DC supplies type A, B, and C according to H.1 of prEN 13611:2005 a tolerance of 20 % to the minimum and the maximum rated voltage applies. For DC supplies of other types the tolerance shall be declared by the manufacturer. The electrical control valve of pneumatic or hydraulic actuating mechanisms shall also meet these requirements. SIST EN 161:2007



EN 161:2007 (E) 14 The closing of pneumatically or hydraulically actuated valves shall be ensured over the range from 85 % to 110 % of the actuating pressure or pressure range declared by the manufacturer. Aspects coming from new designs for closing and/or sealing according to 6.2.15.2.2 shall be taken as part of the performance requirements, as specified in Clause 7. 7.2 Leak-tightness According to prEN 13611:2005, 7.2 Addition: Balanced valves shall be leak-tight when tested with rates given in Table 1. Table 1 — Test pressure Inlet pressure Test pressure p in flow direction mbar 0 mbar ≤ p ≤ 500 mbar 2 × pmax 500 mbar < p ≤ 5000 mbar p = pmax x [ 2 – ( pmax – 500)/9000 ] Maximum leakage rate for internal leak-tightness see values in prEN 13611:2005, Table 2
7.3 Test for leak-tightness 7.3.1 General According to prEN 13611:2005, 7.3.1 7.3.2 External leak-tightness According to prEN 13611:2005, 7.3.2 7.3.3 Internal leak-tightness According to prEN 13611:2005, 7.3.3 Addition: For balanced valves pressurize the inlet to test pressures given in 7.2 and measure the leakage rate. 7.4 Torsion and bending According to prEN 13611:2005, 7.4 7.5 Torsion and bending tests According to prEN 13611:2005, 7.5 7.6 Rated flow rate According to prEN 13611:2005, 7.6 Addition: SIST EN 161:2007



EN 161:2007 (E) 15 7.6.1 Valves with modulating control Where the manufacturer declares opening and closing characteristics for valves with modulating control, these shall be within ±10 % of the manufacturer’s declared value. 7.6.2 Valves with step control For valves with step control, where applicable, the manufacturer shall declare the maximum flow rate for each step as a percentage of the fully open flow rate. It shall not be possible to adjust the maximum flow rate for each step in excess of 1,1 times the declared value when tested to 7.7. 7.6.3 Valves with electrical control When the flow rate changes in response to external electrical signals, it shall not, when tested to 7.7, overshoot in either direction while attaining the new flow rate by more than 20 % of the flow rate at that particular set point, or as declared by the manufacturer. 7.7 Test for rated flow rate 7.7.1 Apparatus According to prEN 13611:2005, 7.7.1 7.7.2 Test procedure According to prEN 13611:2005, 7.7.2 Addition: For valves with modulating or step control verify the declared opening and closing characteristics at rated voltage or current before and after the endurance test for conformity with 7.6.1 to 7.6.3. 7.7.3 Conversion of air flow rate According to prEN 13611:2005, 7.7.3 7.8 Durability According to prEN 13611:2005, 7.8 7.9 Closing function concerning remanence 7.9.1 Requirement Valves shall close automatically on reducing the voltage or current to 15 % of the minimum rated value. Valves with pneumatic or hydraulic actuating mechanisms shall close automatically on reducing the voltage or current to 15 % of the minimum rated voltage of the control valve. Valves shall close automatically on removal of the voltage or current of between 15 % of the minimum rated value and the maximum rated value including the tolerance according to 7.1. In all cases, the closing time shall be in accordance with 7.12. SIST EN 161:2007



EN 161:2007 (E) 16 7.9.2 Test of closing function Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if applicable. Slowly reduce the voltage or current to 15 % of the minimum rated value. Verify that the valve has closed. Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if applicable. Increase the voltage or current to the maximum rated value increased by the tolerance according to 7.1, keeping the actuating pressure, if any, unchanged. De-energize the valve and verify that it has closed. For AC valves, remove the voltage at the peak of the current waveform. Energize the valve at the maximum rated voltage or current and at the maximum actuating pressure, if applicable. Reduce the voltage or current to a value between 15 % of the minimum rated value and the maximum rated value decreased by the tolerance according to 7.1, keeping the actuating pressure, if any, unchanged. De-energize the valve and verify that it has closed. Carry out this test at 3 different voltages or currents between 15 % of the minimum rated value and the maximum rated value decreased by the tolerance according to 7.1. 7.10
Closing force 7.10.1 Requirement Valves with sealing force independent of the closing force (e. g. ball, guillotine valves etc.) shall have a closing force of:  at least 5 times the value of the frictional force where the frictional force is up to and including 5 N;  at least 2,5 times the value of the frictional force but at least 25 N where the frictional force is above 5 N. The frictional force is measured in the ungreased condition. This requirement also applies to disc-on-seat valves with an inlet pressure above 500 mbar. 7.10.2 Test of closing force This measurement is carried out in the ungreased condition. Measure the minimum closing force over the travel of the closure member from the open position to the closed position. Remove the spring(s) providing the closing force from the valve and measure the maximum force required to move the closure member from the open position to the closed position. 7.11
Delay time and opening time 7.11.1 Requirement The delay time and the opening time shall be:  within ± 20 % of the manufacturer's declared value for times above 1 s;  less than 1 s for declared times ≤ 1 s. 7.11.2 Test of delay time and opening time Measure the time interval between energizing the valve and the start of the release of the closure member. SIST EN 161:2007



EN 161:2007 (E) 17 Measure the time interval between energizing the valve and the attainment of a flow rate equal to 80 % of the rated flow rate. Carry out the tests under the following conditions, allowing the de-energized valve to reach thermal equilibrium before carrying out the tests:  at 60 °C (or at the maximum ambient temperature, if higher), at the maximum inlet pressure, at the maximum rated voltage or current increased by the tolerance according to 7.1, and at the maximum actuating pressure, if applicable;  at 0 °C (or
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