User Manual
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Siemens 2-port seat valves PN25 with flanged connection CM1N4373en
Building Technologies 15.11.2010
Technical data
Functional data PN class PN 25 to ISO 7268
Working pressure to ISO 7005 within the permissible "
medium
temperature
" range according to the diagram
on page 7
Flow characteristic • 0…30 %
• 30…100 %
• linear
• equal percentage; n
gl
= 3 to VDI / VDE 2173
Leakage rate 0…0.02 % of k
vs
value to DIN EN 1349
Permissible media: water cooling water, chilled water, low temperature hot
water, high temperature hot water, water with
anti-freeze;
recommendation: water treatment to VDI 2035
brine
steam
saturated steam, super-heated steam;
dryness at inlet minimum 0.98
(use only valves with suffix G)
heat transfer oils
(use only valves with suffix A or M)
Medium temperature
1)
water, brine
2)
VVF52..
VVF52..A, VVF52..G, VVF52..M
saturated steam VVF52..G
super-heated steam VVF52..G
heat transfer oils
VVF52..A, VVF52..M
-20…150 °C
180 °C
180 °C 600 kPa (6 bar)
180 °C 600 kPa (6 bar)
permissible temperature and pressure range
according to the diagram on page 7
180 °C
Rangeability S
v
DN 15: 50…100
DN 25…40: 100…200
Nominal stroke 20 mm
Industry standards Pressure Equipment Directive
PED 97/23/EC
Pressure Accessories as per article 1, section 2.1.4
Fluid group 2
without CE-marking as per article 3, section 3
(sound engineering practice)
Environmental compatibility
ISO 14001 (Environment)
ISO 9001 (Quality)
SN 36350 (Environmentally compatible
products)
RL 2002/95/EG (RoHS)
Materials Valve body nodular cast iron EN-GJS-400-18-LT
Stem stainless steel
Plug, seat stainless steel
Sealing gland
3)
standard version: brass, silicon-free
special version: stainless steel
Gland materials
3)
standard version: EPDM O-ring, silicon-free
special version:
VVF52..A: PTFE sleeve
VVF52..G: PTFE sleeve
VVF52..M: PTFE sleeve, silicon-free
Dimensions / Weight Refer to "Dimensions", page 11
Flange connections
to ISO 7005
1)
For 150…180 °C use electrohydraulic SKB.. actuators.
2)
Electric stem heating element required for media below 0 °C.
3)
Silicon-free version to 180 °C with type suffix M.