Burkert 2657 Instructions De Service page 13

TechnicalData
name and material of the individual parts
position Components
1 Insert
2 Handle
3 Shaft O-ring
4 Shaft
5 Ball seat
6 Ball
7 Body
8 Support O-ring for ball seat EPDM-FKM
9 Radial seal O-ring
10 Socket seal O-ring
11 Support for ball seat
12 End connector
13 Union nut
16 Spring for lock (optional)
Safety handle block for lock
17
(optional)
25 Position indicator
26 Dual Block Locking device
Type 2657
Material
PVC-U
PVC-U
EPDM-FKM
PVC-U/PP/PVC-C/PVDF
PTFE
PVC-U/PP/PVC-C/PVDF
PVC-U/PP/PVC-C/PVDF
EPDM-FKM
EPDM-FKM
PVC-U/PP/PVC-C/PVDF
PVC-U/PP/PVC-C/PVDF
PVC-U/PP/PVC-C/PVDF
Stainless steel
PP-GR
POM
POM
6.2.2. pressure-temperature graphs
The fluidic data is dependent on the material properties of the plastic
ball valve.
Information on the chemical resistance of thermoplastic and
elastomer materials can be found in our table of resistances
- on the Internet at www.buerkert.com or in a brochure
(order no. 00896009)
→
At operating temperatures above 20° C reduce the operating
pressure depending on the material as follows:
bar
16
14
12
10
8
6
4
2
0 20
Fig. 4: PVC
english
PVC
40 60 °C
13