Model RK71 - Gravity Circulation Checks and Non-Return Valves Brochure

Downstream of circulating pumps in heating and hot water installations to prevent gravity circulation.Pressure/Temperature Ratings / MaterialDimensionsPressure Drop ChartsSBO 11, SBO 21 SBO 31Curve 1: SBO 21 DN 1"Curve 2: SBO 11 DN 1"Curve 1: SBO 31 DN 3/4"Curve 2: SBO 31 DN 1"Differential pressures at zero volume flow.SBO 11SBO 21SBO 31Outlet: Screwed maleInlet: Screwed femaleLLLOpening PressuresApplicationOutlet: Screwed maleInlet: Union nutOutlet: Screwed femaleInlet: Union nut Max. service Max. service Materials pressure [bar] temperature [°C] Body Valve cone 6 1301) Brass (CW614N) PPO1) Max. service temperature at atmospheric pressureCurve 3: SBO 21 DN 11/4"Curve 4: SBO 11 DN 11/4"Curve 3: SBO 31 DN 11/4"Type SBO 11 SBO 21 SBO 31Size DN 1" 11/4" 1" 11/4" 3/4" 1" 11/4" L [mm] 66 82 57 70 39 40 45Connections Inlet 2) G 11/2 G 2 G 11/2 G 2 G 11/4 G 11/2 G 2(BSP thread) Outlet G 1 G 11/4 G 1 G 11/42) SBO 11 and SBO 21: Thread of union nutGravity Circulation Checks SBO, PN 6Type DN Opening pressure [mbar] Direction of flow with- out with spring spring X X V YSBO 11 1" 1 7 6 6 11/4"SBO 21 1" 1 7 6 5 11/4" 3/4" SBO 31 1" 2 9 7 5 11/4"Partial opening / instable range Full opening / stable rangePressure drop ?p [bar]Volume flow V?wPartial opening / instable range Full opening / stable rangePressure drop ?p [bar]Volume flow V?wApplicationBody MaterialDimensionsPressure/Temperature RatingsRK 70 (lower part) / RK 71 (upper part)DN 15 – 100 mmRK 70DN 125 – 200 mmMB 14L DN [mm] 15 20 25 32 40 50 65 80 100 125 150 200 [in] 1/2 3/4 1 11/4 11/2 2 21/2 3 4 5 6 8 L [mm] 16 19 22 28 31.5 40 46 50 60 90 106 140RK 70 D [mm] 40 47 56 72 82 95 115 132 152 184 209 264RK 71 D [mm] 40 47 56 72 82 95 115 132 152 – – – L [mm] 49 49 61 61 72 72 – – – – – –MB 14 D [mm] 42 42 62 62 83 83 – – – – – – A.F. [mm] 30 30 46 46 65 65 – – – – – –DISCO® Non-Return Valves RK, PN 6 to PN 16Screwed Non-Return Valves MB, PN 16Type PN For liquids, especially suited for heating and hot-water RK 70 6 installations. Application as gravity circulation check and check valve.RK 71 16 For liquids, gases, vapours. Application as gravity MB 14 16 circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valveType Nominal sizes DN EN reference ASTM equivalent1)RK 70 Body 15 – 100 mm Brass (CW617N) Brass Valve disk Plastic PPe – Body 125 – 200 mm Grey cast iron (eN-JL 1040) A126 Class A Plug Plastic Polyamid 6 –RK 71 Body 15 – 100 mm Brass (CW617N) Brass Valve disk 1.4571 AISI 316 Ti MB 14 Body 15 – 50 mm Brass (CW614N) Brass Valve disk 1.4571 AISI 316 Ti 1) ASTM material similar to EN material. Observe different physical and chemical propertiesType PN Nominal sizes DN PMA / TMA / [bar] / [°C]RK 70 6 15 – 100 6 / -30 1.5 / 100 0.5 / 130 6 125 – 200 6 / -10 1.5 / 100 0.5 / 130RK 71 16 15 – 100 16 / -60 14 / 200 13 / 250MB 14 16 G 1/2 – G 2 16 / -60 14 / 200 13 / 250RK DesignsType Seat Spring metal-to EPDM FPM PTFE without special Nimonic metal spring spring spring RK 70 (Plastic) – – – – – – UseRK 71 X Use RK 41 Use RK 41 – RK 86MB 14 X – – – – – – – X : standard– : not availableEarthingconnectionUse RK 86Ø DLØ DLDISCO® Non-Return Valves RK, PN 6 to PN 16Screwed Non-Return Valves MB, PN 16Differential pressures at zero volume flow. Opening PressuresRK 71*)RK 70*) Pressure Drop ChartsThe 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· · V· W = equivalent water volume flow in [l/s] or [m3/h]? = Density of fluid (operating condition) in [kg/m3]V· = Volume of fluid (operating condition) in [l/s] or [m3/h]?1000 DN Opening pressures [mbar] Direction of flow without with spring spring X X V Y 15 0.4 7.8 7.4 7 20 0.4 7.8 7.4 7 25 0.4 7.8 7.4 7 32 0.5 9 8.5 8 40 0.5 9.5 9 8.5 50 0.6 9.7 9.1 8.5 65 0.7 10.4 9.7 9 80 0.8 11.6 10.8 10 100 0.9 12.3 11.4 10.5 125 2.0 9.0 7.0 5.0 150 2.5 10.0 7.5 5.0 200 2.5 10.0 7.5 5.0*) RK 70, 71 are not available with special spring or without spring DN Opening pressures [mbar] Direction of flow without with spring spring X X V Y 15 2.5 10 7.5 5 20 2.5 10 7.5 5 25 2.5 10 7.5 5 32 3.5 12 8.5 5 40 4.0 13 9 5 50 4.5 14 9.5 5 65 5.0 15 10 5 80 5.5 16 10.5 5 100 6.5 18 11.5 5When selecting valve please consider:Partial opening/ Full opening/instable range stable rangeWhen selecting valve please consider:Partial opening/ Full opening/instable range stable rangeRK 70, RK 71MB 14