JP FLUID CONTROL
MANUAL-ST-SA English
www.jpfluidcontrol.com
2
ST-SA SERIES
SOLENOID VALVES
1.
TECHNICAL SPECIFICATIONS
1.1.
Principle of operation
A solenoid valve is a valve for neutral, clean liquids and gases, which is
electrically controlled with the aid of a solenoid. 2/2 way means that the
valve has two ports (input / output) and two positions (closed / open). The
valve is normally closed, this means that the valve is closed when de-
energized.
Semi-direct operated solenoid valves combine the properties of both direct
and indirect operated solenoid valves. The force that is required to open
and close the diaphragm is supplied by both the solenoid plunger as well as
the pressure of the medium. This allows them to work from zero bar
pressure differential. Furthermore, they can control a high flow rate with a
relatively small solenoid core. They can be used in only one flow direction.
This type of solenoid valves is used in systems that require a reasonable flow
rate, but the pressure difference between input and output is low or
unknown.
1.2.
Area of application
Body material
The ST-SA series is available with a brass or stainless steel body material.
Body material
Allowed media
Brass (ASTM #37800)
Neutral and non-corrosive media.
Stainless Steel (S316)
Suitable for aggressive media and
corrosive media like seawater.
Diaphragm
The ST-SA series is available with several materials. In the following table a
concise overview is presented of compatible media.
Diaphragm
Temperature
Allowed
media
Not allowed
FKM
-10°C..120°C
Most fuels
and oils,
cold water,
detergents,
compresse
d air.
Glycol-based brake
fluids, ammonia gas,
hot water and steam,
low molecular weight
organic acids (such as
acetic acid.
EPDM
-30°C..130°C
Water and
steam,
alcohol.
Oils, fats, fuels,
solvents.
NBR
-10°C..80°C
Neutral
media, like
air, cold
water,
hydraulic
oil.
Fuels, strong acids,
brake fluid.
1.3.
Flow chart
In the flow chart, the flow of water from 20°C is shown as a function of
the positive pressure difference across the valve. The flow rate is
expressed in liters per minute and the pressure in bar. The graph shows
different pipe diameters. The stainless steel valves (SS) of the ST-SA
series have a lower flow rate due to a smaller orifice.
1.4.
Duty cycle
The solenoid valve is suitable for continuous use. High switching
frequencies and high pressures can reduce the lifespan.
1.5.
Compliance
The coils are CE marked and comply with the LVD Directive (2006/95/EC)
and Directive (2004/108/EC), provided that the cables and connectors
are properly connected.
1.6.
Type label
The properties of both the valve and the coil are displayed on a label on
the coil. In the figure below, an example is shown.
JP
FLUID CONTROL
ST-SA012B105E
Norma lly Closed
Pipe:
1/ 2"
Seal:
EPMD
Pressure: 0
– 16 bar
Orifice:
10.5 mm
Coil: CS1-230AC
230V~50Hz IP-65
POSITIO N
PRO DUCT C ODE
PIPE CO NNECTIO N
SEAL MATERIAL
WO RKING PRESSURE
O RIFICE
C E-MARK
PRO DUCT C ODE C OIL
PRO TEC TIO N G RADE
VO LTAG E
COIL
VALVE
1.7.
Exploded view
In the figure below is an exploded drawing of the ST-SA series is
displayed.
10
100
0.5
2.5
4.5
6.5
8.5 10.5 12.5 14.5
W
a
te
r f
low
(
l/
min
)
dp (bar)
1/4"
3/8"
1/2"
SS
