Gestra TA 10 Blowdown Program Control

Data sheet: 810292-01 Issue: 06/20
Calorimat Return-Temperature Control Valves
BW 31, BW 31A
PN 40 / Class 150, DN 15 – 25
PN 25 / Class 150, DN 40
BW 31, BW 31A, DN 15 – 25 mm (½–1") without external adjusting device
System description
Function
Description The return-temperature control valve regulates demand-based consumption in industrial heating systems. When the temperature of the fluid drops, it increases the flow in the return line.
Fluid only flows when its temperature is below the closing temperature. This maintains an adequate fluid flowrate as well
as constant pressure and temperatures and reduces heat losses.
The closing temperature is factory-set and can be changed within the adjustable temperature range.
Installation The valve must be installed in the return line, paying attention
to the arrow indicating the direction of flow. It may be installed in any position, but ideally in a horizontal line with the cover
pointing upwards or downwards.
The equipment regulates the flow of fluid using a Thermovit regulator and spring pressure.
When the fluid temperature drops, the flow orifice opens, letting more fluid through. When the fluid temperatures rises,
the Thermovit regulator closes the flow orifice more, so that less fluid can pass through.
The flow orifice always remains slightly open. Consequently, there is always a minimal flow (known as the “bleed flow”).
The Thermovit regulator is therefore continuously immersed in the fluid and can respond directly to changes in temperature.
Use
BW 31
for hot water
BW 31A
for heating oil
Optional features n External adjusting device n Special external adjusting device
n Controller SL: Reduced bleed flow
BW 31, DN 15 – 25 mm (½–1") with external adjusting device
Closing temperatures
DN 15 ½" 20 – 130
Closing temperature ranges [°C] 1)
DN 20
DN 25 ¾" 1" 20 – 115
DN 40 1½" 20 – 110
BW 31 with external adjusting device
60 – 130
40 – 115
50 – 110
BW 31 with special external adjusting device
20 – 110
20 – 90
20 – 75
120 – 270
100 – 280
100 – 270
BW 31
BW 31A
BW 31, BW 31A
PN 40/Class 150, DN 15–25
PN 25/Class 150, DN 40
BW 31,BW BW31A, 31ADN 15 – 25 mm (½–1") with external adjusting device DBL40/Class
803637-02 PN 150, DN 15–25
PN 25/Class 150, DN 40
DBL 803637-02
BW 31A with external adjusting device
90 – 270
BW 31A with special external adjusting device
60 – 160
1)
End connections
2 The equipment can be supplied with the following connections:
n Flange EN 1092-1, B1, PN 40 (DN 15-25 mm (½–1")) n Flange EN 1092-1, B1, PN 25 (DN 40 mm (1½"))
n Flange ASME B 16.5, Class 150 RF (DN 15-25, 40 mm (½-1", 1½")) n Screwed socket G: ISO 228-1
n Screwed socket NPT: ASME B 16.11
30 – 170
25 – 85
F or the BW 31 and BW 31A without external adjusting device, please state the desired closing temperature. We can supply
equipment that is set to a fixed closing temperature in 5 °C increments within the ranges above.
Pressure & temperature ratings Pressure & temperature ratings of DN 15 mm (½"), DN 20 mm (¾"), and DN 25 mm (1")
Max. differential pressure Δ PMX: 6 bar Connection
Flanges EN PN 40 (CL 300), screwed sockets, socket-weld ends, butt-weld end
Service pressure [bar]
40.0
37.1
33.3
27.6
25.7
23.8
Inlet temperature [°C]
–10/20
100
200
300
350
400
Connection 2
70 – 270
Flanges ASME Class 150
Service pressure [bar]
19.6
17.7
13.8
10.2
8.4
6.5
Inlet temperature [°C]
–29/38
100
200
300
350
400
Pressure & temperature ratings of DN 40 mm (1½”) Max. differential pressure Δ PMX: 6 bar
Connection
Flanges EN PN 25 (CL 300), screwed sockets, socket-weld ends, butt-weld end
Service pressure [bar]
40.0
37.1
33.3
27.6
25.7
23.8
Inlet temperature [°C]
–10/20
100
200
300
350
400
Connection
Flanges ASME Class 150
Service pressure [bar]
19.6
17.7
13.8
10.2
8.4
6.5
Inlet temperature [°C]
–29/38
100
200
300
350
400
1