DU146
AUTOMATIC BYPASS AND DIFFERENTIAL PRESSURE VALVE WITH DIFFERENTIAL PRESSURE INDICATOR
PRODUCT DATA
Application
Design
The bypass and differential pressure valve comprises:
•Body with internally threaded inlet and outlet
•Spring bonnet
•Display tube for differential pressure indication
•Adjustment facility
•Valve disc
•Spring
Materials
•Unpolished brass housing
•High-grade synthetic material spring bonnet
•High-temperature resistant synthetic material display tube
•High-quality synthetic material adjuster knob
•Brass valve disc
•Stainless-steel spring
•EPDM seals
The DU146 automatic bypass and differential pressure valve is used to maintain constant differential pressure in a heating system. It reduces flow noise in a system, particularly as thermostatic radiator valves are closing. The boiler return temperature is raised and this reduces the corrosion caused by flue gas condensation. In addition, when radiator valves are closed it also maintains flow over the temperature sensor on the boiler to ensure proper operation of external temperature compensating controls. On gas fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed.
Features
•Simple installation between the flow and return pipework
•Minimises flow noise
•No external controls required
•Differential pressure finely adjustable
•Simple adjustment using the integral differential pressure indicator
•Hinders boiler corrosion
•Setting value is in meters water column
•Tried and tested
Range of Application
For pumped hot water heating systems
Specifications
Medium |
Hot water |
Operating temperature |
max. 110°C (230°F) |
Operating pressure |
max. 3,0 bar (43,5 P.S.I.) |
Differential pressure |
Adjustable between |
|
0,05...0,5 bar (0,7...7,3 P.S.I.) |
|
Set during manufacture at 0,2 bar |
|
(2,9 P.S.I.) |
Connection size |
3/4" and 1 1/4" |
Copyright © 2002 Honeywell AG • All rights reserved |
EN0H-0181GE25 R0402 |
DU146
Function
At equal pressure between the inlet and outlet side the valve is closed. The valve disc is pushed by a spring against the valve seat. If there is a pressure difference between the inlet and outlet sides, then a force is exerted on the valve disc and against the spring. If this force exceeds the force of the spring, then the valve begins to open in proportion to the rise in differential pressure and maintains a constant bypass flow as indicated on the flow diagram.
Versions
A = Standard version
Special versions on request
Type R |
|
Dimensions |
|
for installations 90/70 up to |
Ordering-No. |
||
|
L |
I |
H |
h |
ca. kW |
approx. kcal/h |
|
3/4" |
36 |
50 |
160 |
100 |
70 |
60 000 |
DU146-3/4 A |
1 1/4" |
51 |
58 |
213 |
155 |
232 |
200 000 |
DU146-1 1/4 A |
Accessories
Complete indicator tube
For DU146 differential DU146AH-A pressure and bypass
valve.
Comprising: Indicator tube, spring, indicator piston and 5 ‘O’ rings
EN0H-0181GE25 R0402 |
2 |
Honeywell AG • All rights reserved |
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