GEM 693 Manual page 39

Internal surface finishes for forged and block material bodies
Readings for Process
Contact Surfaces
Ra ≤ 0.80 μm
Ra ≤ 0.60 μm
Ra ≤ 0.40 μm
Ra ≤ 0.25 μm
3
Readings for Process
Contact Surfaces acc. to
ASME BPE 2016
Ra Max. = 0.76 μm (30 μinch)
Ra Max. = 0.64 μm (25 μinch)
Ra Max. = 0.51 μm (20 μinch)
Ra Max. = 0.38 μm (15 μinch)
Readings for Process
Contact Surfaces
Ra ≤ 6.30 μm
Ra ≤ 0.80 μm
Ra ≤ 0.60 μm
5
Surface finishes of customized valve bodies may be limited in special cases.
1
Or any other finishing method that meets the Ra value (acc. to ASME BPE).
2
The smallest possible Ra finish for pipe connections with an internal pipe diameter < 6 mm is 0.38 μm.
3
When using these surfaces, the bodies are marked according to the specifications of ASME BPE.
4
The surfaces are only available for valve bodies which are made of materials (e.g. GEMÜ material codes 40, 41, F4, 44)
and use connections (e.g. GEMÜ connection codes 59, 80, 88) according to ASME BPE.
Not possible for GEMÜ connection code 59, DN 8 and GEMÜ connection code 0, DN 4.
5
Ra acc. to DIN EN ISO 4288 and ASME B46.1
Order example
Type
Nominal size
Body configuration (code)
Connection (code)
Valve body material (code)
Diaphragm material (code)
Supply voltage (code)
Mains frequency (code)
Functional module (code)
Surface finish (code)
Mechanically polished
Hygienic class
DIN 11866
H3
-
H4
H5
Mechanically polished
ASME BPE
Surface
4
Designation
SF3
SF2
SF1
-
Internal surface finishes for investment cast bodies
Hygienic class
698 25
698
25
2
Code
1502
1507
1536
1527
2
Code
SF3
SF2
SF1
-
Mechanically polished
DIN 11866
-
H3
-
D 60 C3
D
60
C3
39 / 64
1
Electropolished
Hygienic class
DIN 11866
HE3
-
HE4
HE5
Electropolished
ASME BPE
Surface
Designation
-
SF6
SF5
SF4
2
Code
1500
1502
1507
13 L 4
13
L
4
693, 698
Code
1503
1508
1537
1516
Code
-
SF6
SF5
SF4
AE 1500
AE
1500