Burkert 6520 NAMUR, Operating Instructions Manual, Page: 24 / 50

23 Operating instructions no. 800 608
NOTE Under normal conditions, the devices work maintenance-free.
3.3 Valve construction
• Drives: - Piezo drive,
- PROFIBUS-PA
• Valve housing with membrane and seat seals (5/2)
• Service ports 2 (B) / 4 (A) with change-over plate to MAMUR flange layout,
plus feed and drain connections 1, 3 and 5 with G 1/4 internal thread
• Can be installed in any position, preferably with connection at top
3.4 Operation
5/2 way valve:
In standby position, pressure port 1 connected to outlet 2.
Outlet 4 vented
3/2 way valve with return of exhaust:
In standby position, pressure port 1 blocked, outlet 2 vented
into output 4
The integrated exhaust air feedback prevents the penetration of
ambient air into the spring recess of the drive.
NOTE Application in either 5/2 or 3/2 way type.
To convert from the 5/2 to the 3/2 way model, or vice versa, turn
the change-over plate through 180°. When using as a 3/2 way
valve, close off outlet 3 with the supplied G1/4 locking screw.
This ensures that the integrated feedback of outgoing air
functions correctly.