GESTRA DISCO Non-Return Valves RK 41, PN 16. Non-Return Valves PN 6/10/16 DN (½ 8") RK 41, PN 16. Application for liquids, gases, vapours.

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1 GESTRA DISCO Non-Return Valves RK 41, PN 16 Gestra Steam Systems GESTRA Non Return Valves RK 41 PN 6/10/ (1/2" - 8") Issue Date: 8/01 Non-Return Valves PN 6/10/ (½ 8") RK 41, PN 16 A2 Application for liquids, gases, vapours. Pressure / Temperature Rating for valves with metal-to-metal seat [mm] Nominal sizes [in] 1 / Nominal pressure PN 16 1 ) Max. service pressure [barg] [psig] Related temperature [ C] [ F] Minimum temperature 2 ) 60 C ( 76 F) 10 C ( 14 F) 1) In terms of resistance also rated for ASME 125 and ) Minimum temperature for nominal pressure rating. Soft seats EPDM (ethylene propylene): 40 to +150 C ( 40 to +302 F) for water, condensate and steam. FPM (fluoro rubber): 25 to +200 C ( 13 to +392 F) for oils, gases and air. But also note valve pressure/temperature rating in the above table. Chemical resistance see GESTRA Information A mm ( 1 /2 4") Connections of wafer-type valves 3 ) Standard valves for fitting between flanges to DIN BS ASME DIN 2501 (BS 4504) BS 10 tables D, E, F ASME B 16.1 Class 125 FF PN 6/10/16 ASME B 16.5 Class 150 RF 4 ) 3) mm ( 1 /2 4) with universal centering ring. 4) ASME class 150 RF only suitable for mm (5 8"). Dimensions [mm] [in] ½ ¾ 1 1¼ 1½ 2 2½ Dimensions L 5 ) , in mm D Weight [kg] ) Overall length according to DIN EN 558-1, table 11, series 49 (=^ DIN 3202, part 3, series K 4) mm (5 8") Materials mm ( 1 /2 4") DIN reference ASTM equivalent Body, seat and guide ribs Brass CuZn 35 Ni Valve disc, spring retainer X 6 CrNiMoTi A182F316 Spring A 313 Type 316 Centering ring X 12 CrNi A 313 Type mm (5 8") Body, seat EN-GJL-250 EN-JL 1040 (GG-25) (0.6025) A 126 Class A Valve cone and spindle EN-GJS EN-JS 1030 (GGG 40) (0.7040) A Guide support UZSt A 105 Spindle guide X 5 CrNi A 182 F 304 Spring X 6 CrNiMoTi A 313 Type 316 Old DIN designations are stated in brackets. These products comply with the requirements of the EC Pressure Equipment Directive (PED) 97/ mm with CE marking mm are excluded from the scope of this Directive and not entitled to bear the CE marking.

2 A2 RK 41, PN 16 Non-Return Valves PN 6/10/ (½ 8") GESTRA GmbH P.O. Box , D Bremen Münchener Str. 77, D Bremen Tel.+49 (0) , Fax Internet Opening Pressures Differential pressures at zero volume flow [mm] [in] Opening pressures [mbar] Direction of flow without with springs springs 15 ½ ¾ ¼ ½ ½ mbar = psi = 10 mm w.g. = 0.4 in w.g. On request at extra charge, special springs for opening pressures: between 5 and 1000 mbar for mm (½ 2"), between 5 and 700 mbar for 65 and 80 mm (2½ 3"), between 5 and 500 mbar for mm (4 8"). Enquiry Specification GESTRA DISCO non-return valve RK 41 PN 6/10/16. Wafer design with extremely short overall length to DIN EN 558-1, table 11, series 49. Suitable for fitting between flanges to DIN, BS or ASME. Indications on pressure, nominal size (), body material. Metal-to-metal seat or soft seat (EPDM or FPM). Order Specification Type RK 41,... Metal-to-metal or soft seat (EPDM or FPM). Fluid, flowrate, pressure and temperature. Type of pipe flanges. Note The valves should not be used on compressors or where pulsating flow exists. For these applications please consult us. Pressure Drop Chart The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. lmp. gal/min [m³/h] [l/s] V w = V V w ρ V ρ 1000 = Equivalent water volume flow in [l/s] etc. = Density of fluid (operating condition) in [kg/m³] etc. = Volume of fluid (operating condition) in [l/s] etc. When selecting valve please consider: Partial opening Full opening = instable range = stable range mm Supply in accordance with our general terms of business. Technical modifications reserved GESTRA GmbH BREMEN Printed in Germany /801c Volume flow V w bar psi Pressure drop [ p] 1 US gallon = Imp. gallon

3 Gestra Steam Systems Valvola di ritegno GESTRA RK 71 PN 6 / 10 / 16, (1/2" - 4")

4 A Unit of Flowserve Corporation 1 mbar =^ psi =^ 100 mm w.g. =^ 0.4 in w.g. 1 US gallon =^ Imp. gallon /1005i

5 GESTRA RK 76 DISCO Non-Return Valves Issue Date: 10/00 Non-Return Valves PN 6/10/16/25/ mm ( 1 /2-4 ) A2 RK 76 Application for liquids, gases and vapours. Pressure/Temperature Rating Nominal sizes [mm] [in] 1 /2 4 Nominal pressure PN 40 1 ) Max. service pressure [barg] for RK 76 [psig] D Related temperature [ C] [ F] Minimum temperature 2 ) 10 C (14 F) 1 ) Also rated for ANSI class 300, but see flange details below. 2 ) Minimum temperature at nominal pressure rating. Tight shut-off in accordance with DIN 3230, part 3, leakrate BN2/BO3. L Connections of wafer-type valves 3 ) Valves for universal fitting between flanges to DIN BS ASME DIN 2501 (BS 4504) BS 10 ASME B 16.1 class 125 FF PN 6/10/16/25/40 tables D, E, F, H, J 4 ) ASME B 16.5 class 150/300 RF BS ) With universal centering ring. 4 ) Tables D/E, 65 mm and 80 mm (2 1 /2 and 3 ): Choose nominal size one size smaller each. Dimensions [mm] [in] 1 /2 3 / /4 1 1 / /2 3 4 Dimensions in mm L 5 ) D Weight [kg] ) Overall length according to DIN EN 558-1, series 49 (=^ DIN 3202, part 3, series K4) Materials mm ( 1 /2 4 ) DIN reference ASTM equivalent Body, seat and guide ribs G-X 8 CrNi A 217-CA 15 Valve disc, spring retainer A 182 F 316 X 6 CrNiMoTi Spring A 313 Type 316 Centering ring X 12 CrNi Type 302

6 A2 RK 76 Non-Return Valves PN 6/10/16/25/ mm ( 1 /2-4 ) GESTRA GmbH P. O. Box , D Bremen Hemmstraße 130, D Bremen Tel. +49(0) Fax +49 (0) Internet Opening pressures Differential pressures at zero volume flow [mm] [in] Opening pressures in mbar Direction of flow with springs 15 1 / / / / / mbar =^ psi =^ 10 mm w.g. =^ 0.4 in w.g. Pressure Drop Chart The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. V. W = V. Ú 1000 V. W = Equivalent water volume flow in l/s etc. Ú = Density of fluid (operating condition) in kg/m 3 etc. V. = Volume of fluid (operating condition) in l/s etc. Enquiry Specification GESTRA DISCO non-return valves RK76. Wafer design with extremely short overall length to DIN EN 558-1, table 11, series 49 =^ DIN 3202, part 3, series K4) Suitable for fitting between flanges to DIN,BS or ASME FF. Indications on pressure, nominal size (), body material. Imp. gal / min When selecting valve please consider Partial opening Full opening = instable range = stable range m 3 /h l/s mm Order Specifications Type RK 76,.. Metal-to-metal Fluid, flowrate, pressure and temperature. Type of pipe flanges. Note The valves should not be used on compressors or where pulsating flow exists. For these applications please consult us.. Volume flow Vw bar Supply in accordance with our general terms of business. Technical modifications reserved GESTRA GmbH BREMEN Printed in Germany /1000 Pressure drop p 1 US gallon Imp. gallon

7 DISCO Non-Return Valves RK, PN 6 to PN 40 Short overall length according to DIN EN 558-1, table 11, series 49 (=^ DIN 3202, part 3, series K4) RK 86 and RK 86 A Our Robust All-Rounder Application Ø D min. Ø D max. Type PN RK 86 40/class 300 RK 86 A 40/class 300 For liquids, gases, vapours. Application as gravity circulations check, vacuum breaker, breather, foot valve, pressure-maintaining valve, check valve. RK 86 A especially suited for low temperatures, aggressive fluids, boiler feedwater lines, and other industrial applications. L RK 86 / RK 86 A mm Body Material Type Nominal sizes EN reference ASTM equivalent 1 ) RK 86 Body mm Chromium steel, A 743-CA6-NM Valve disk AISI 316 Ti Body mm GP240GH (1.0619) A 216 WCB Plug A182 F6 A RK 86A Body mm A351 CF 8M Valve disk AISI 316 Ti Body mm A351 CF 8M Plug A182 F316 L 1 ) ASTM material similar to EN material. Observe different physical and chemical properties! D min. D max. RK 86 / RK 86 A mm Dimensions Nominal [mm] sizes [Inch] 1 /2 3/ /4 1 1 / / Overall L , dimensions D min [mm] D max PN 10/ PN D PN Class 125/ Class Weight [kg] Pressure/Temperature Ratings with metal-to-metal seat Typ PN p / T / [bar] / [ C] 40/class / / / 350 RK 86 40/class / / / 400 RK 86 A 40/class / / / 550 L RK 86 / RK 86 A mm Ø D Designs Type Seat Springs metal-to- EPDM FPM PTFE 3 ) without special Nimonic metal ( 40 up to ( 25 up to spring spring spring 4 ) 150 C) 2 ) 200 C) 2 ) RK 86 X O O O O O O X RK 86A X O O O O O O X 2) Observe pressure/temp. ratings of the equipment 3) C up to 250 C; up to 200 C 4) Required for temperatures above 300 C X : standard O : optional Earthing connection

8 DISCO Non-Return Valves RK, PN 6 to PN 40 Pressure Drop Charts The curves given in the chart are valid for water at 20 C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to spring-loaded valves with horizontal flow. With vertical flow insignificant deviations occur only within the range of partial opening. ρ V W = V 1000 V W = equivalent water volume flow in [l/s] or [m 3 /h] ρ = Density of fluid (operating condition) in [kg/m 3 ] V = Volume of fluid (operating condition) in [l/s] or [m 3 /h] Opening Pressures Differential pressures at zero volume flow. RK 86, RK 86 A Opening pressures [mbar] Direction of flow without with spring spring X X V Y RK 86, 86A When selecting valve please consider: Partial opening/ instable range Full opening/ stable range w. Volume flow Vw Pressure drop ρ