GASTEC QA. Approval Requirements 69-1

Transcription

1 KE 69-1 May 2014 GASTEC QA Approval Requirements 69-1 for the GASTEC QA product certificate for Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings

2 Foreword These GASTEC QA Approval requirements have been accepted by the Board of Experts of the GASTEC QA Quality Mark, wherein all the relevant parties in the field of gas related products are represented. This Board of Experts also supervises the certification activities and where necessary require the GASTEC QA Approval Requirements to be revised. All references to Board of Experts in these GASTEC QA Approval requirements pertain to the above mentioned Board of Experts. These GASTEC QA Approval requirements will be used by Kiwa Nederland B.V. in conjunction with the Kiwa regulations for carrying the GASTEC QA Quality mark. This regulation details the method employed by Kiwa Nederland B.V. for conducting the necessary investigations prior to issuing the (technical approvalwith) product certificate and the method of external control. The inspection frequency is determined by the above mentioned Board of Experts. Approved by Board of Experts : May 2014 Accepted by Kiwa Nederland B.V. : May 2014 Kiwa Nederland BV Wilmersdorf AC Apeldoorn Postbus AC Apeldoorn The Netherlands Tel Fax Kiwa Nederland B.V. All rights reserved. No part of this book may be reproduced, stored in a database or retrieval system, or published, in any form or in any way, electronically, mechanically, by print, photo print, microfilm or any other means without prior written permission from the publisher. The use of this evaluation guideline by third parties, for any purpose whatsoever, is only allowed after a written agreement is made with Kiwa to this end. Kiwa Nederland B.V May 2014

3 Contents 1 Introduction General Scope Field of application Acceptance of test reports provided by the supplier 6 2 Product Requirements General Operation Materials for valve knobs or handles Sealing of passages Rubber Materials Connections Inlet connection Outlet connection 8 3 Performance Requirements Leak-tightness in locked position Operating Torque Resistance against torsion of union connections Endurance test Resistance to low temperature Impact resistance 10 4 Marking Marking 11 5 Testing methods General Determination of the resistance against torsion of the union coupling Determination the self-extinguishing property Determining the impact resistance Testing installation Test samples Working method 12 6 Quality system requirements General Manager of the quality system Internal quality control/quality plan 14 Kiwa Nederland B.V May 2014

4 6.4 Procedures and work instructions Other Quality system requirements 14 7 Summary of tests and inspections Test matrix manually operated ball valves and closed bottom taper plug valves for gas installations for buildings Evaluation of the quality system Frequency of external audits 16 8 Agreements on the performance of certification General Certification staff Qualification requirements for executive staff of CI that fulfil the requirements of EN Qualification requirements for executive staff of a CI that are in addition set up by the Board of Experts for the subject of this evaluation guideline Qualification 18 9 List of mentioned documents Standards/ normative documents Appendix A: Model IQC-scheme 20 Appendix B 21 Kiwa Nederland B.V May 2014

5 (New) Change Paragraph Whole document The requirements are replaced by a reference to NEN-EN 331:1998 / A1: A general introduction is included 1.3 Guidelines for the Installation of Main and Service Lines of KVGN was replaced by the Dutch Standard series NEN Excluded art. 5.7 Resistance to high temperature 2.6 Extra requirements for union connections are added 3.3 Torsion test union connections is added 3.6 Requirements on impact resistance are added 5.2 ISO R7 is replaced by NEN-EN A test for determining the impact resistance is added 7 Summary of tests and inspections included 7.1 Removed art. 5.7 Resistance to high temperature from matrix 8 Agreements on the performance of certification included 9 List of referenced documents included Appendix A Model of IQC-scheme included Appendix B Model Certificate included Kiwa Nederland B.V May 2014

6 1 Introduction 1.1 General These requirements replace the GASTEC QA Approval Requirements 69-1, Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings, dated June Other valve types for gas installations shall meet the requirement of GASTEC QA Approval Requirements 69, Metal gas taps for installations inside buildings, March 1996 and amendment A1 March 2012 During the execution of the certification work, Kiwa is bound to the requirements as laid down in the chapter Agreements on the performance of certification. 1.2 Scope These Approval Requirements specify the requirements for manually operated ball valves and closed bottom taper plug valves for domestic and commercial installations not directly buried, inside or outside of buildings, using gases of the second and third family (as specified in EN 437). Valve nominal sizes (DN) covered by these Approval Requirements are as follows: 6, 8, 10, 12, 15, 20, 25, 32, 40 and 50. The specific functional recommendations for application of these valves are described in the requirements and measuring methods NEN 1078 and NEN 2078, and national and international norms and/or regulations. 1.3 Field of application Manually operated ball valves used: In gas installations for separating different sections. In this application NEN-EN 1078 applies for gas installations in buildings, and NEN 2018 applies for industrial gas installations. As a connecting tap in connecting lines with appliances. For this application the Dutch code of practice NPR applies. As a main stop for service connections by utility services, upstream the gas meter and pressure regulator (if any) in distribution systems. In this application NEN applies. 1.4 Acceptance of test reports provided by the supplier The rules for acceptance of test reports provided by the supplier are laid down in the Regulations for Product Certification for bearing the GASTEC QA quality mark. Kiwa Nederland B.V May 2014

7 2 Product Requirements 2.1 General In this chapter the performances requirements imposed on the ball valves and closed bottom taper plug valves, as well as the determination methods in order to be able to determine whether the requirements are fulfilled. The requirements to be met for these ball valves and closed bottom taper plug valves, as well as accompanying testing methods, are based on the following standard: NEN-EN 331:1998 / A1:2010 Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings, except for article 5.7 (former article 5.4) of NEN-EN 331:1998 / A1:2010 Resistance to high temperature. This requirement has not to be met. Ball valves and closed bottom taper plug valves that meet these GASTEC QA approval requirements also meet NEN-EN 331:1998 / A1:2010 except for article 5.7 (former article 5.4) of NEN-EN 331:1998 / A1:2010 Resistance to high temperature. Supplementary to that stated in NEN-EN 331:1998 / A1:2010 the following requirements must be met: 2.2 Operation In addition to NEN-EN 331:1998 / A1:2010, Article 5.5 (former Article 5.2), breakage or removal of the valve knob or handle may never lead to leakage of the valve. It shall be possible, if required with the help of auxiliary tools, to operate the valve in case of absence of the knob or handle. 2.3 Materials for valve knobs or handles The knob or handle must be made of metal or plastic. If the knob or handle is made of plastic, the plastic should be self-extinguishing under the test circumstances described in article Sealing of passages Passages between movable parts of gas conducting spaces and the environment may not be sealed with the help of re-adjustable packing bushes. The sealing construction in the valve must ensure good sealing in all valve positions i.e. any position between open and closed and in the locked position. 2.5 Rubber Materials In addition to NEN-EN 331:1998 / A1:2010, Article (former ), the temperature class of the rubber materials should be at least A Connections In addition to NEN-EN 331:1998 / A1:2010, Article 5.3 (former Article 5.1.3), it is permitted to provide the valve with one of the following connections. The connections must comply with the relevant requirements or standards. Threaded inlet and outlet connections for valves with pressure-tight joints, made on the threads, shall conform NEN-EN Inlet connection Couplings for high-tensile mechanical joints in polyethylene pipeline systems, shall be in accordance with GASTEC QA Approval Requirements 70. Compression fittings for connecting copper tubes, shall be in accordance with GASTEC QA Approval Requirements 35. Press Fittings for joints in copper and metal gas pipes, shall be in accordance with GASTEC QA Approval Requirements 186. Kiwa Nederland B.V May 2014

8 2.6.2 Outlet connection Compression fittings for connecting copper tubes, shall be in accordance with GASTEC QA Approval Requirements 35. Press Fittings for joints in copper and metal gas pipes, shall be in accordance with GASTEC QA Approval Requirements 186. Union couplers shall be in accordance with NEN 2541, NEN 2542, NEN 2544 and a rubber gasket with dimensions according to NEN 2545 and hardness according to NEN-EN 549 class H3. If a construction is used to secure the union nut behind the liner, other than specified in the NEN 2542 and NEN 2544, then at least the following dimensions specified in the NEN 2542 and NEN 2544 shall be maintained: The liner (figure 2): Dimensions d4, d3, d2, dimensions of detail A and when grip areas for mounting are necessary v,w,t,u or s,h and g, sizes as mentioned in NEN The maximum bore shall be equal or less than dimension d1. The union nut (figure 3): Dimensions s and m (the thread shall be according to ISO 228-1) The minimum total high of the key face shall be equal or greater than length p. After mounting the gasket it shall be possible to screw the swivel nut (with thread t ) on the thread (l) of the valve part (figure 1) with a minimum thread length of ¾ x l. Figure 1: Valve part Figure 2: Liner Figure 3: Union nut All Dimensions will be found in NEN 2541, NEN 2542, NEN 2544 and NEN Kiwa Nederland B.V May 2014

9 3 Performance Requirements 3.1 Leak-tightness in locked position In addition to NEN-EN 331:1998 / A1:2010, Article 7.2, the outer and inner leak-tightness should also be measured with the knob or handle of the valve in the locked closed position. 3.2 Operating Torque Contrary to NEN-EN 331:1998 / A1:2010, Article 6.4, the operating torque may not exceed the values as given in Table 1. DN Torque (N-m) Ambient and low temperature max.* , *The torque required for the preliminary cycle must not be greater than three times the maximum value at ambient temperature given for the size of the valve. Table 1 Operation torque 3.3 Resistance against torsion of union connections In addition to NEN-EN 331:1998 / A1:2010, Article 6.5, the union coupler must resist a torque according to Table 2. Under the test circumstances according to Article 5.2 of this standard, the union connection may not show any permanent deformations and/or damage, and it must be gastight when tested according to NEN- EN 331:1998 / A1:2010, Article 7.2. Dimension m nut Torsion moment in Nm 10 s test ½ (DN12) 20 ¾ (DN15) 30 1 (DN20) 40 1 ¼ (DN25) 55 1 ½ (DN32) 80 2 (DN40) 100 2½ (DN50) 120 Table 2 Torque resistance of union connections If used a construction to secure the union nut behind the liner, other than specified in the NEN 2542 and NEN 2544, an additional test shall be done. The union nut shall be tightened with a torque of 6 Nm x DN size for 10 s. The nut will not be allowed to come loose from the liner. 3.4 Endurance test Contrary to NEN-EN 331:1998 / A1:2010, Article (former Article 6.6.1), after the endurance test the operation must conform to the requirements given in Article 3.2. Kiwa Nederland B.V May 2014

10 3.5 Resistance to low temperature Contrary to NEN-EN 331:1998 / A1:2010, Article (former Article 6.6.2), the operation torque must conform to the requirements given in Article Impact resistance The impact-resistance of joints is determined by the impact of a falling impact-body of defined dimensions and mass of 5 kg dropped from a height of 600 mm. After the impact and a strength pressure test with 5 bar no leakage shall be detected at a leak-tightness test according to NEN-EN 331:1998 / A1:2010 article and The valve may not shift from its original mounting position. This shall be determined according to article 5.4. Kiwa Nederland B.V May 2014

11 4 Marking 4.1 Marking In addition to clause 9 of NEN-EN 331:1998 / A1:2010 (former article 8.1) The housing of the valve and the connecting parts shall be clearly and durably marked with - The GASTEC QA marking. - Nominal size DN - Pressure class (MOP);0,2 or 0,5 0r 5 0r 5-20 where applicable - Direction of flow (If necessary) - Date of manufacture (at least the year), may be in code. Kiwa Nederland B.V May 2014

12 5 Testing methods 5.1 General If not mentioned, the accuracy of the apparatus used shall be according to NEN-EN 331:1998 / A1: Determination of the resistance against torsion of the union coupling Fix the inlet side of the valve firmly with appropriate connection facilities. Fix the union coupling on the outlet side by means of a swivel nut with a torsion moment according to Table 2. Maintain this torsion moment for 10 sec. Remove the torsion moment and measure the external gas tightness according to NEN-EN 331:1998 / A1:2010, Article 7.2. If used a construction to secure the union nut behind the liner, other than specified in the NEN 2542 and NEN 2544 then do an additional test and apply a moment of 6 Nm x DN size to the swivel nut for 10s. The nut will not be allowed to come loose from the liner. 5.3 Determination the self-extinguishing property Heat a valve knob or handle made of plastic for 5 seconds using the outer flame of a Bunsen burner with an inner diameter of 10 mm and a charge of ± 1.9 kw. Hold the bottom of the operating-organ 10 mm above the top of the inner flame cone. After removal of the Bunsen burner, the plastic should extinguish by itself within 5 seconds. 5.4 Determining the impact resistance Testing installation To determine the resistance to impact of the valve and his connections, the test samples must be included in an installation in which, during the impact the valve is fixed. The striker (X) shall have a spherical head with a radius of 10 mm and a mass of 5 kg (see figure 4 ) Test samples One test sample is needed to perform the complete test. The test sample is made of an end-fitting, pipe, valve, pipe, end-fitting. Fit the most rigid pipe (e.g. steel pipe, copper pipe or PE-pipe) to the valve, for which the connection is suitable. Each pipe length is 1000 mm for straight valves and 300 mm for angled valves. Fit the test assembly in a rigid test rig Working method Conduct a complete test as described below for the next three positions of the test sample: Straight valve; Test 1: one impact on the knob Test 2: one impact on the side Test 3: one impact on the bottom Angled valve; Test 1: one impact the knob Test 2: one impact on the side Test 3: one impact on the back The tests are conducted as follows. a) Each end fitting is fixed on a rigid support. b) Perform an external leak-tightness test according NEN-EN 331:1998 / A1:2010, article and c) Pressurize the valve with an internal pressure equal at the MOP of the valve. d) Drop a striker from a height of 600 mm on a spot on the valve as described before. e) Perform a strength test by pressurizing the valve in the test rig up to 5 bar. Kiwa Nederland B.V May 2014

13 f) Perform an external leak-tightness test according NEN-EN 331:1998 / A1:2010, article and Figure 4: Impact resistance test assembly Kiwa Nederland B.V May 2014

14 6 Quality system requirements 6.1 General This chapter contains the requirements that have to be fulfilled by the manufacturer s quality system. 6.2 Manager of the quality system Within the manufacturer s organizational structure an employee must be appointed who is in charge of managing the quality system. 6.3 Internal quality control/quality plan As part of the quality system the manufacturer must implement an internal quality control schedule (IQCscheme). In this IQC-scheme the following must be demonstrably recorded: which aspects are inspected by the manufacturer; according to which methods these inspections are carried out; how often these inspections are carried out; how the inspection results are registered and stored. This IQC-schedule shall be in the format as shown in the annex. The schedule must be detailed in such a way that it provides Kiwa sufficient confidence that requirements will be continuously fulfilled. 6.4 Procedures and work instructions The manufacturer must be able to submit: Procedures for: o the handling of non-conforming products; o corrective actions in case non-conformities are found; o the handling of complaints regarding the products and / or services supplied; The work instructions and inspection sheets in use. Instructions for packaging and closing off of products during storage and transport. 6.5 Other Quality system requirements The quality system of the production location shall be ISO 9001 certified. The ISO 9001 quality system may be combined with the IQC scheme. Kiwa Nederland B.V May 2014

15 7 Summary of tests and inspections This chapter contains a summary of tests and inspections to be carried out during: Initial evaluation: the investigation necessary in order to determine whether all requirements of the evaluation guideline are fulfilled, Inspection visit: the surveillance inspections carried out after issue of the certificate in order to determine whether the certified products continuously fulfil the requirements of this evaluation guideline. The inspections are carried out according to the frequency indicated. Inspection of the quality system: inspection with regard to the correct implementation of the Internal Quality Control -scheme (IQC-scheme) and procedures. 7.1 Test matrix manually operated ball valves and closed bottom taper plug valves for gas installations for buildings Description of requirement Clause guideline or standard Investigation in the framework of Pressure classes NEN-EN 331:1998 / A1:2010 : 4.1 Temperature classes NEN-EN 331:1998 / A1:2010 : 4.2 Materials NEN-EN 331:1998 / A1:2010 : 5.1 (former 5.1.1) Construction NEN-EN 331:1998 / A1:2010 : 5.2 (former: 5.1.2) Connections NEN-EN 331:1998 / A1:2010 : 5.3 (former 5.1.3) Seals NEN-EN 331:1998 / A1:2010 : 5.4 (former 5.1.4) Operation NEN-EN 331:1998 / A1:2010 : 5.5 (former 5.2) Stops NEN-EN 331:1998 / A1:2010 : 5.6 (former 5.3) General NEN-EN 331:1998 / A1:2010 : 6.1) Leak-tightness NEN-EN 331:1998 / A1:2010 : 6.2 Rated flow NEN-EN 331:1998 / A1:2010 : 6.3 Operating torque NEN-EN 331:1998 / A1:2010 : 6.4 Torque and bending resistance NEN-EN 331:1998 / A1:2010 : 6.5 Endurance NEN-EN 331:1998 / A1:2010 : (former 6.6.1) Initial evaluation tests Supervision by CI after certificate granting 1 ) Inspection 2 ) Frequency X X once a year X X once a year X EN 10204: 3.1 certificates supplier every batch X X every batch X X X every batch X X X X X every batch X X X once a year X X once a year X X once a year Kiwa Nederland B.V May 2014

16 Resistance to low temperature NEN-EN 331:1998 / X A1:2010 : (former 6.6.2) Stop resistance NEN-EN 331:1998 / X X once a year A1:2010 : 6.8 (former 6.7) Additional GASTEC QA approval requirements Operation GASTEC QA 69-1 : 2.2 X Materials for valve knobs or handles GASTEC QA 69-1 : 2.3 X EN 10204: 3.1 certificates supplier once a year Sealing of passages GASTEC QA 69-1 : 2.4 X Rubber materials GASTEC QA 69-1 : 2.5 X Connections GASTEC QA 69-1 : 2.6 X Inlet connections GASTEC QA 69-1 : X Outlet connections GASTEC QA 69-1 : X Endurance test GASTEC QA 69-1 : 3.4 X X once a year Impact resistance GASTEC QA 69-1 : 3.6 X X Leak-tightness in locked position GASTEC QA 69-1 : 3.1 X X every batch Operating Torque GASTEC QA 69-1 : 3.2 X X once a year Resistance against torsion of union GASTEC QA 69-1 : 3.3 X connections Endurance test GASTEC QA 69-1 : 3.4 X X once a year Resistance to low temperature GASTEC QA 69-1 : 3.5 X 1) In case the product or production process changes significantly, the performance requirements shall be determined again with respect to paragraph 13 of the Kiwa regulations for product certification. 2) All product properties that can be determined within the visiting time (maximum 1 day) are determined by the inspector or by the supplier in the presence of the inspector. In case this is not possible, an agreement will be made between the certification body and the supplier about how the inspection will take place. 7.2 Evaluation of the quality system During each inspection visit the quality system of the supplier shall be examined and evaluated. 7.3 Frequency of external audits The frequency of external audits is set at 2 audits per year at the production location and/or supplier. Kiwa Nederland B.V May 2014

17 8 Agreements on the performance of certification 8.1 General This chapter contains the by the Board of Experts elaborated agreements on the performance of certification by Kiwa. 8.2 Certification staff The staff involved in the certification process is sub-divided into: Certification engineers: in charge of carrying out the pre-certification tests and assessing the reports of the inspectors; Inspectors: in charge of carrying out external inspections at the supplier s works; Decision-makers: in charge of taking decisions in connection with the pre-certification tests performed, continuing the certification in connection with the inspections performed and taking decisions with regard to corrective actions. 8.3 Qualification requirements for executive staff of CI that fulfil the requirements of EN The qualification of the executive staff of a CI must fulfil the requirements of EN The way qualification of the staff is performed must be described in the quality manual of the CI. EN45011 Auditor (A) pre-certification tests and inspections of companies Inspector (B) factory, field & project visits and follow-up inspections (C) person deciding on granting of certificate 1 Education, general 2 Education, specific 3 Experience, general 4 Experience, specific Relevant tech. thinking and working level comparing to Bachelor (1,2) Internal training in certification and Kiwa policies Training in audit skills Training geared towards this guideline Specific courses and training (knowledge and skills) 1 year of relevant working experience with a minimum of 4 tests of which: 1 complete precertification test independently, under supervision Detailed knowledge of certification and 4 tests relating to this specific guideline or to guidelines which are related to each other. Tech. thinking and working level at vocational education (intermediate level)(2) Internal training in certification and Kiwa policies Training in audit skills Training geared towards this guideline Specific courses and training (knowledge and skills) 1 year(3) of relevant working experience with a minimum of 4 tests, 1 of which independently, under supervision Detailed knowledge of certification and 4 tests relating to the specific guideline or to guidelines which are related to each other Thinking and working at Bachelor level (2) Internal training in certification and Kiwa policies Training in audit skills not applicable 4 years of working experience, with a minimum of 1 year of experience with certification Basic knowledge of the specific certification Kiwa Nederland B.V May 2014

18 8.4 Qualification requirements for executive staff of a CI that are in addition set up by the Board of Experts for the subject of this evaluation guideline No additional requirements are set up by the Board of Experts. 8.5 Qualification Certification staff must be demonstrably qualified by evaluation of education and experience of the abovementioned requirements. In case qualification takes place on the basis of other criteria, then this has to be recorded in writing. The authority for qualification rests with: Decision-makers: qualification of the certification experts and inspectors; Management of the certification body: qualification of the decision-makers. Kiwa Nederland B.V May 2014

19 9 List of mentioned documents 9.1 Standards/ normative documents Sorted by number: NEN NEN-EN 331: 1998 and NEN-EN 331: 1998/ A1: 2010 Gas supply systems Pipelines for maximum operation pressure up to 16 bars Part 10: Specific functional requirements for housing for installations and housing for meters with a maximum inlet pressure of 100 mbars and a maximum design capacity of 650 m 3 n /h. Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings NEN 1078:2001 Supply for gas with an operating pressure up to and including 500 mbar - Performance requirements - New estate NEN 2078:2001 Requirements for industrial gas installations NEN 2541: 1967 Fittings and connections for gas conduits NEN 2542: 1967 Fittings and connections with outside thread for gas conduits NEN 2544: 1967 Coupling nuts for fittings for gas and water conduits NEN 2545: 1967 Packing rings for fittings for gas conduits NEN-EN : 2004 Pipe threads where pressure tight joints are made on the threads Part 1: Taper external threads and parallel internal threads. NPR : 1999 Code of practice gas installations Section gas pipe work Part 11: Connecting pipe work and taps NEN-EN 437: + A1: Test gases - Test pressures - Appliance categories 2009 NEN-EN 549: 1995 Rubber materials for seals and diaphragms for gas appliances and gas equipment Kiwa Nederland B.V May 2014

20 10 Appendix A: Model IQC-scheme Subject Aspect Method Frequency Registration Incoming control supplied materials Material data sheets Raw materials Material Certificates According EN type 3.1 Semi-finished product Fastening materials Coating Sealing materials Production process Cast process Hot press process Treated parts Welding process Application coating Assemblage Production machinery Procedures Work instructions Used apparatus Finished product inspection Status of measuring and test equipment Logistics Internal transport Storage Package Identification Marking Procedure nonconforming Complaints procedure Rubber; Certificates EN 549 Material data sheets Shore hardness Appearance Dimensions Applied inspection methods Inspection frequency Registration and recording inspection results. Applied inspection methods Inspection frequency Registration and recording inspection results. Leak tightness Applied inspection methods Inspection frequency Registration and recording inspection results. List of used measuring and test equipment Calibration and maintenance reports Registration and recording. Registration and recording. Kiwa Nederland B.V May 2014

21 Appendix B Number Replaces -- Issued Scope KE 69-1 Report number Page Contract number Product Certificate Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings Based on pre-certification tests as well as periodic inspections by Kiwa Nederland B.V., the products referred to in this certificate and marked with the GASTEC QA mark, supplied by Manufacturer may, on delivery, be relied upon to comply with the Provisional GASTEC QA Approval Requirements 69-1, Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings. Bouke Meekma Kiwa This certificate is issued by Kiwa Nederland BV in conjunction with the Kiwa Regulations for carrying the GASTEC QA quality mark. This certificate consists of.. pages. Publication of the certificate is allowed. Kiwa Nederland B.V. Wilmersdorf 50 P.O. Box AC APELDOORN The Netherlands Tel Fax Company..... P.O. Box T F Kiwa Nederland B.V May 2014

22 Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings PRODUCT SPECIFICATION APPLICATION AND USE Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings are used for Separating different sections in gas installations. As a connecting tap in connecting lines with appliances As a main stop for service connections by utility services MARKING manufacturer's name or trade mark; function and type indication (low-pressure cut-off valve for natural gas nominal input in m 3 st/h; nominal pressure 25 mbars; GASTEC QA word mark or logo Place of the mark: On the product Method of marking: Permanent marking. RECOMMENDATIONS FOR CUSTOMERS: 1. Check at the time of delivery whether: 1.1 the manufacturer or supplier has delivered in accordance with the agreement; 1.2 the mark and the marking method are correct; 1.3 the products show no visible defects as a result of transport etc. 2. If you should reject a product on the basis of the above, please contact: 2.1 Manufacturer and, if necessary, 2.2 Kiwa Nederland B.V. 3. Consult the producer's processing guidelines for the proper storage and transport methods. 4. Check whether this certificate is still valid by consulting Kiwa or the Kiwa website. Kiwa Nederland B.V May 2014