JP FLUID CONTROL
MANUAL-ST-SB-EN v1.2 www.jpfluidcontrol.com 2
ST-SB 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 open, this means the valve closes when
voltage is applied.
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 a 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, while the pressure
difference between input and output is low or unknown. Semi-direct
operated solenoid valves open slower than direct operated solenoid
valves, but they are suitable for higher flow rates.
1.2.
Area of application
Body material
The ST-SB series is available with a brass or stainless steel body material.
Depending on the application, the right material should be selected.
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-SB series is available with several materials. In the following table a
concise overview is presented of compatible media. Depending on the
application the correct diaphragm should be selected.
Diaphragm
Temperature
Allowed media
Not allowed
FKM
-10°C.120°C
Most fuels and
oils, cold water,
detergents,
compressed 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-SB
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 coil properties are displayed on a label on the coil. A second label is
provided with the valve that shows all relevant valve parameters. This
label must be attached to the other side of the coil. In the figure below,
an example is shown.
10
100
0.5
2.5
4.5
6.5
8.5
10.5
12.5
14.5
D
e
b
iet
w
a
te
r
(l/
min
)
dp (bar)
1/4"
1/2"
3/8"
Stainless
