Gestra SBO21

Gravity Circulation Check SBO 21

Data Sheet 818646-03 Issue Date: 08/17
Gravity Circulation Checks
SBO 11, SBO 21, SBO 31
PN 6
DN ¾", 1", 1¼" Description Check valve for installation downstream of circulating pumps in heating and hot water installations to prevent gravity circulation.
Pressure & temperature ratings
SBO 11 1
Service pressure
bar
6
Operating temperature
°C
130 1)
) Valve cone not under pressure
End connection
SBO 11: Vale inlet provided with a collar for fitting the union nut of the circulating pump. Valve outlet screwed female for
direct connection to the feed line.
SBO 21: Vale inlet provided with a collar for fitting the union nut of the circulating pump. Valve outlet screwed male for
connecting an additional stop valve.
SBO 31 Valve inlet screwed female for direct connection to the circulating pump. Valve outlet screwed male for fitting the
nipple with gasket and union nut of the circulating pump.
Dimensions D2
SBO 21
A. F.
D2 D2
L
L1
L
L
A. F.
SBO 31
D1 A. F.
D1
D1
SBO 11
SBO 21
Type Nominal size
SBO 11
SBO 31
SBO 21
SBO 31
DN
1"
1¼"
1"
1¼"
¾"
1"
1¼"
L
66
82
57
70
39
40
45
25.5
26.5
31.5
D1
G 1½
G2
G 1½
G2
D2
G1
G 1¼
R1
R 1¼
G 1¼
G 1½
G2
A. F.
36
46
36
46
50
55
65
[kg]
0.4
0.6
0.32
0.6
0.3
0.34
0.5
L1 Dimensions
Weight
Materials Type Body
SBO 11
SBO 21 CW614N
Valve cone
CW614N Plastics PPO*)
Spring to close
1.4310
Seat gasket
EPDM
Guide
1.4310
*) Note that PPO is not resistant to glycol!
SBO 31
Hot-pressed brass (CW614N)