APPENDIX: TECHNICAL INFORMATION
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1 Materials Test and Operation Specifications Quality Assurance MATERIALS: Cast Iron Grey iron GD-250 GG-25 to DIN Grade 220/250 minimum to BS Class 35B/40B to ASTM-A Ductile iron SF-400 GGG-40 to DIN Grade to BS to ASTM-A Ductile iron SFP-500 GGG-50 to DIN Grade to BS to ASTM-A Enamelled Ductile iron SFP 500 GGG-50 to DIN Grade to BS to ASTM-A Stainless steel Standard No DIN X 12 CrMo S Composition C 0.12% - S 0.2% - Cr 16.5% - Mo 0.25% Standard No DIN X 20 Cr 13 BS 420S Composition C 0.2% - Cr 13% Standard No DIN X 5 CrNi 189 AISI Composition C 0.07% - Si 1% - NB 2% - Cr 18% - Ni 10% Standard No DIN X 12 CrNi 17-7 AISI Composition C 0.12% - Cr 17% - Ni 7% Navy Brass CZ 132 BS 2872/2874 Free of dezincficnation Composition Cu 62% - Zn 36.2% - PB 1.75% - AS 0.06% Gun Metal DIN 1705 RG5 BS 1400-LG2-C Composition Cu 85% - Zn 5% - PB 5% - Sn 5% Bolt materials Zinc coated steel 8.8 to DIN BS Grade 5 to AM-St Bolts are available in stainless steel (see specifications)
2 MATERIALS: RUBBER MATERIALS: O-rings Material ref. no to ASTM D 2000 Nitrile rubber (NBR) Hardness 70 IRHD Hardness Tensile strength Elongation Temperature IRHD % Range (min.) C SBR Both to SIS and BS 2494 type 1 and , NBR To BS 2494 type To DIN 3535 part 3 and AWWA C509-87, to BGA Kat. 31 KTW, DVGW-listed, Germany To SIS EPDM All to BS 2494 type 1 and WRC-listed, England KTW-listed, Germany COATINGS: Epoxy The valve bodies and bonnets are electrostatically fusion powder coated internally and externally with epoxy to give excellent resistance to corrosion, wear and abrasion. The coating is approved for use in drinking water systems, meeting all specified toxicological conditions. Types: Akzo Nobel, Resicoat RT 9000 R4 Blue Jotun Powder, EP R Blue Film thickness, According to DIN and mechanical specificatioans The coating is resistant to a wide range af different chemicals and has an excellent weather resistance. Approval: Hygiene-Institute, Germany KIWA, Holland WRC, England Enamel By this process the valve bodies and bonnets are enamelled internally. This glass lining gives a first class resistance to corrosion, wear and abrasion, and it does not support bacteriologic growth. The enamel is approved for use in drinking water systems, meeting all specified toxicological conditions. Type:»Ferro«blue enamel 2509 Film thickness: 200 my in two layers. Mechanical, physical, and chemical tests: According to DIN 3475 The enamel is highly resistant to a wide range of different chemicals and against microbiological attack. Approvals: KIWA-Institut, Holland Hygiene-Institute, Germany PLASTIC Polyamid 6.6 Type:»AKULON«Grade S 223-F (Nylon 6.6) Acetal, glass fibre reinforced Type:»HOSTAFORM«Grade % glass fibre
3 TEST SPECIFICATIONS Quality Control, Pressure Test and Operation Torques PRESSURE TESTS: Gate valves/fire hydrants for water Hydraulic test according to DIN 3230 part 4, and BS Shell test: Water test pressure 1.5 x PN (2 x PN acc. to AWWA C509) Seat test: Water test pressure 1.1 x PN (1 x PN acc. to AWWA C509) Seat tests are done from both sides and with one end open. Gate valves for gas According to DIN 2470 part 1, and DIN 3230 part 5. The product shall pass the above specified test for water first. Shell test: Seat test: PG1 0.5 bar PG2 0.5 bar PG3 0.5 bar and 1.1 x PN PG1 0.5 bar PG2 0.5 bar PG3 0.5 bar and 1.1 x PN Seat tests are done from both sides and with one end open. QUALITY ASSURANCE The production of all series in the AVK-programme are controlled in accordance with the procedures and specifications laid down in the»avk-quality MANUAL«. AVK is certified according to ISO 9001 / EN
4 Face to face dimensions and height above center line Stem squares Standard flange drillings FACE TO FACE DIMENSIONS AND HEIGHT ABOVE CENTER LINE: H Valves to DIN 3352 part 4 Valves to BS 5163 DN Face to face dim. Face to face dim. Height above Face to face dim. Height above to DIN 3202, part 1, F4 to DIN 3202, part 1, F5 center line to BS 5163 center line L L H L H mm mm mm mm mm * * STEM SQUARES AND HEIGHT ABOVE CENTER LINE: H Service Valves connection valve to DIN 3352 part 4 Valves to BS 5163 DN H H1 F F1 H1 F F1 H1 F F1 mm mm mm mm mm mm mm mm mm mm * * STANDARD FLANGE DRILLINGS: DN H1 ds L Dt F1 F 2,5 Dh D Drillings to ISO 7005 part 2 (EN : 1997, DIN 2501): DN D Dt Dh ds mm mm mm mm Holes PN 10 PN 16 PN 10 PN 16 PN 10 PN * *
5 Field of application Operation Torques and number of turns to open FIELD OF APPLICATION: Fields of application are stated in the data sheet of each valve series. If the solids of the medium make up more than 10% the AVK knife gate valve is recommended. If the medium contains special substances, information of the chemical designation, concentration, and the temperature of the medium must be given on inquiry of the valves. OPERATION: To avoid a seizure of the internal parts, it is recommended to operate the valves with the following minimum intervals, which at the same time ensures a long durability: - valves for water and gas: every year - valves for sewage and industry: every third month After operation the valve must be: - fully open and the stem released from stress or - closed with the closing torque stated in the table The valve must not be exposed to low temperatures, causing the medium to freeze. TORQUES AND NUMBER OF TURNS TO OPEN: Valves to DIN 3352 part 4 Valves to BS 5163 Valve dimension Closing Free running Rupture Turns to Closing Rupture Turns to DN torque torque torque open torque torque open mm Nm Nm Nm Nm Nm * * Service connection valves Actuated valves Electric actuator AVK series 03 AVK series 15/40 Valve dimension Closing Rupture Turns Closing Turns DN torque torque to open torque to open mm Nm Nm Nm
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