VEGA Mounting accessories, pressure measurement technology - Manual (Page 11)

5 .2 Double blocking valve
Double blocking valves according to DIN 16270 enable simple
mounting, setup and dismounting of a pressure transmitter with
process fitting ½ NPT.
The process valve blocks the pressure transmitter against the
process. The ventilation/test valves enables two functions with closed
process valve:
l
Ventilation of the pressure transmitter
l
Check the pressure transmitter via a connected pressure
calibrator.
The valves are opened via hand wheels (turning anticlockwise) or
closed (turning clockwise). The seal in the medium is purely metallic,
the seal of the valve spindles is a gland packing.
3
2
5
4
1
4
5
1
3
2
1/2 NPT
1/2 NPT
1/4 NPT
100 mm
(3.94")
Fig. 4: Configuration double blocking valve
1
Input (process)
2 Valve for blocking, process
3 Valve for ventilation
4 Ventilation/Test
5 Output (pressure transmitter)
Application area/Func-
tion
Handling
Configuration
Mounting accessories, pressure measurement technology 11
5 Blocking valves
43478
-
EN
-121018