7
Operating function
DA 516
Installation in the return pipe. The pressure upstream the consumer acts through an external impulse pipe (
D
p+).
The pressure downstream the consumer (upstream the controller) acts through an internal impulse pipe (
D
p-).
The spring force can be adjusted by turning the setting wheel (5).
DAF 516
Installation in the inlet pipe. Function is the same as DA 56, except that the pressure downstream the consumer (from down-
stream the controller) acts through the another external copper impulse pipe (
D
p-).
5
∆
p-
11 10
3
2
6
∆
p-
∆
p+
1
4
3
2
7
5
8
9
DN 65-125
DN 15-50
DAF 516
STAD
(STAF)
M
STAD
(STAF)
DA 516
M
DAF 516
STAD
(STAF)
M
STAD
(STAF)
DA 516
M
Installation
Install the controller in the return pipe, downstream the consumer (DA 56) or in the inlet pipe, upstream the consumer (DAF
56). Flow direction is shown by arrow on the valve’s identification plate (6). The best position is horizontal with vent screws (2)
on top. Installation of a strainer in front of the controller is recommended.
Connect copper impulse pipe (
D
p+) to the pipeline upstream the consumer. In case of DAF 56, connect another copper impulse
pipe (
D
p-) downstream the consumer (from behind the controller). In case of a horizontal pipeline connect the copper impulse
pipe laterally to prevent air and dirt from entering.
It is important to ensure that working temperature and pressure do not exceed allowed values.
Before you mount the controller, check the fitting length of the controller and distance between connections on the pipeline.
You should fit the connections (welding and threaded ends) to the pipeline first, then clean the remains of welding operations
if needed. Then install the controller. If you use flanged connections, check pitch diameter and the diameter of the holes for the
screws.
When the pipeline and the controller are full of water and the pressure is stabilized, vent the controller by the vent screws (2).
If the measuring point is mounted on DA 56 the differential pressure over the load can be measured by using the balancing
instrument TA-CBI or measuring instrument TA-CMI. Installation of balancing valve STAD (STAF) is recommended to enable flow
measurement, commissioning and troubleshooting with TA-CBI/TA-CMI.
