Dungs FRM 100025 HD, Instruction Manual, Page: 112 / 174

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Edition 10.15 • No
. 270 442
5. List of abbreviations
Abbreviation Description
AG
o
Response pressure group of the upper response pressure
AG
u
Response pressure group of the lower response pressure
AC Accuracy class
ASE Safety shutoff valve (without housing)
C
v
Flow volume coefficient
DN Nominal diameter
Fail-open The firing valve moves automatically to the open position, if the main diaphragm or the
auxiliary power required for the actuation of the firing valve fails
IS Type: standard strength range
Class A Functional class: the SSD closes if the comparison diaphragm is damaged or the auxiliary power supply
has failed
MOP Maximum admissible operating pressure
p
d
Outlet pressure
p
u
Inlet pressure
p
do
Upper response pressure
p
du
Lower response pressure
p
max
Maximum operating pressure
p
zul.
System-specific operating pressure according to the regulator
PN Nominal pressure of the flange
PS Maximum admissible pressure
SSD Safety shutoff valve
SBV Safety relief valve
SG Lock-up pressure class
SN Serial number
SZ Closing pressure zone group
Tp. Operating temperature -20 °C ... +60 °C
W
ds
Specific guide range
W
do
Adjustment range for the upper response pressure through regulation of the
available adjusting springs
W
du
Adjustment range for the lower response pressure through regulation of the
available adjusting springs
W
dso
Specific adjustment range of the adjusting spring installed for the upper response pressure
W
dsu
Specific adjustment range of the adjusting spring installed for the lower response pressure