Datasheet

Front matter 9
Glossary of Terms
Pressure Terminology
1. Maximum operating pressure differential
The maximum pressure differential (the difference between
the inlet and outlet pressure) which is allowed for operation,
with the valve closed or open. When the downstream pressu-
re is 0 MPa, this becomes the maximum operating pressure.
2. Minimum operating pressure differential
The minimum pressure differential (differential between the
inlet pressure and the outlet pressure) required to keep the
main valve fully opened.
3. Maximum system pressure
The maximum pressure that can be applied inside the pipeli-
nes (line pressure).
(The pressure differential of the solenoid valve unit must be
less than the maximum operating pressure differential.)
4. Withstand pressure
The pressure which must be withstood without a drop in
performance after returning to the operating pressure range.
(value under the prescribed conditions)
Others
1. Material
NBR: Nitrile rubber
FKM: Fluoro rubber – Trade names: Viton
®
, Dai-el
®
, etc.
EPDM: Ethylene propylene rubber
PTFE: Polytetrafluoroethylene resin – Trade names: Teflon
®
,
Polyflon
®
, etc.
FFKM: Perfluoroelastomer
Trade names: Kalrez
®
, Chemraz
®
2. Oil free treatment
The degreasing and washing of wetted parts.
3. Passage symbol
In the JIS symbol ( ) IN and OUT are in a blocked con-
dition (
), but actually in the case of reverse pressure
(OUT>IN), there is a limit to the blocking.
( )
is used to indicate that blocking of reverse pressure is not
possible.
Electrical Terminology
1. Apparent power (VA)
Volt-ampere is the product of voltage (V) and current (A). Po-
wer dissipation (W): For AC , W = V.A cosθ. For DC, W = V.A.
(Note) cosθ shows power factor. cosθ = 0.6
2. Surge voltage
A high voltage which is momentarily generated in the shut-off
unit by shutting off the power.
3. Degree of protection
A degree defined in the “JIS C 0920: Waterproof test of elec-
tric machinery/appliance and the degree of protection against
the intrusion of solid foreign objects”.
IP65: Dust-tight, Low jetproof type
“Low jetproof type” means that no water intrudes inside the
equipment that could hinder it from operating normally by
means of discharging water for 3 minutes in the prescribed
manner. Take appropriate protection measures, since a devi-
ce is not usable in an environment where a water drop is
splashed.