"Gravity Circulation Checks SBO, PN 6 nn

Downstream of circulating pumps in heating and hot water installations to prevent gravity circulation.

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Pressure/Temperature Ratings / MaterialDimensions

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L Max. service Max. service Materials pressure [bar] temperature [C] Body Valve cone 6 130 >
1 ) Brass (CW614N) PPO >
1 ) Max. service temperature at atmospheric pressure >
SBO 11
SBO 21
SBO 31 Outlet: Screwed maleInlet: Union nut
Outlet: Screwed femaleInlet: Union nut Type SBO 11 SBO 21 SBO 31Size DN 1" 1 >
1 / >
4 " 1" 1 >
1 / >
4 " >
3 / >
4 " 1" 1 >
1 / >
4 " L [mm] 66 82 57 70 39 40 45 Connections Inlet >
2 ) G1 >
1 / >
2 G2 G1 >
1 / >
2 G2 G1 >
1 (BSP thread) >
1 1 / >
4 G1 >
1 / >
2 G2 Outlet G1 G1 / >
4 G1 G1 / >
4 L 2 ) SBO 11 and SBO 21: Thread of union nut >

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Opening Pressures
Application

nnDifferential pressures at zero volume flow.

Type DN Opening pressure [mbar] Direction of flow with- out with spring spring Outlet: Screwed maleInlet: Screwed female >

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X X V Y

1" 1 7 6 6 1 >
L SBO 11 >
1 / >
4 " SBO 21 1" 1 7 6 5 1 >
1 / >
4 " >
3 / >
4 " SBO 31 1" 2 9 7 5 1 >
1 / >
4 " >

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Pressure Drop Charts

nnSBO 11, SBO 21SBO 31

Partial opening / instable range Full opening / stable range Partial opening / instable range Full opening / stable range >
Volume flow VЋw Volume flow Vًw Pressure drop ٢Ȇp [bar] Pressure drop ∆p [bar] Curve 1: SBO 21 DN 1"Curve 2: SBO 11 DN 1"Curve 1: SBO 31 DN Curve 3: SBO 21 DN 1 >
1 / >
4 "Curve 4: SBO 11 DN 1 >
3 / >
4 "Curve 2: SBO 31 DN 1" >
1 / >
4 " >
1 / >
4 "Curve 3: SBO 31 DN 1 >

"