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2-way Valve & 3-way Valve
2-way Valve: A
valve which controls fluids by opening and closing the valve
seal.
N.O. type: A valve which shuts off the flow when the actuator operates.
N.C. type: A valve
which opens up the flow when the actuator
operates.
3-way Valve: A valve which
switches the flow by opening and closing the two valve seals.
N.O. port: A port where the flow is shut off
when the actuator operates.
N.C. port: A port where the flow is opened up when the actuator
operates.
COM port: A common port (a port which normally becomes an entrance for
the fluid)
* N.O. = Normally Open, N.C.
= Normally Closed
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Diaphragm-Isolation Solenoid Valve
 Our
diaphragm-isolation solenoid valve consists of two parts. One is the valve part,
which opens and closes the flow path, and the other part is the actuator part, which operates the valve part. A membrane (diaphragm) inside the
valve isolates these two parts from each other. The diaphragm prevents fluids
running inside the valve part (made of highly inert plastics such as PTFE and
PEEK) from flowing
into the actuator mainly made of metals. This function of the diaphragm prevents
fluids from corroding the actuator. Over the cycles of operations, metal dusts
etc. are generated from the actuator, and the diaphragm also prevents the dusts
from mixing into fluids.
This structure is ideal for applications such as sampling devices of analytical
instruments and medical instruments, which do not tolerate impurities. It is
also suitable for handling acids and chemicals which corrode metals. A valve
with this kind of structure is also called "(chemically) inert valve."
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Duty Cycle (ED)
Assuming that one cycle is
composed of ON time (energization time) and OFF time, the proportion of the
ON time in one cycle is called duty cycle.
The duty cycle is calculated from the following formula:
Duty
Cycle (ED) % = (ON time / (ON time + OFF time)) x 100
* If the usage is
not conformed to the duty cycle of a product, the temperature rise of a coil
exceeds the maximum temperature of the insulation class, and the coil can have a
burnout in the worst case scenarios.
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Manifold
A manifold is a whole, which unites multiple flow paths and connections
by divergence of flow paths and/or by connecting flow paths with others.
The advantages of manifolds are as follows:
Reduce the work of piping;
Shorten the flow path;
Minimize the space required for an installation etc.
Manifolds can efficiently arrange fluid control devices such
as valves, and make the complex piping simple and
compact. Thus, they contribute to the miniaturization of instruments.
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Mounting Clips
Mounting clips are used for mounting miniature solenoid valves such as EXAK and
EXAKN. There is no limit for the mounting angles of the solenoid valves.
Please fix the mounting clip with a screw using the mounting hole (diameter =
3.1 mm) on the mounting clip.
Ground Resistance (Earth Resistance): 0.01 Ω
Material: SUS304
A
mounting example of EXAK (mm)
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A
mounting example of EXAKN (mm)
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PEEK (General Name: Polyetheretherketone)
PEEK,
a super engineering plastic,
has high mechanical strength,
high temperature resistance (heat distortion temperature of
150°C or higher)
and high chemical resistance against most of chemicals and solvents.
--> Chemical
Compatibility Table
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Perfluoroelastomer (FFKM)
Perfluoroelastomer is a kind of chemically inert fluoroelastomer. Its chemical
structure is composed of carbon, fluorine, and oxygen atoms, and it exhibits
outstanding chemical resistance to a wide range of chemicals and solvents. Perfluoroelastomers
can be used for ketones and esters, which are not compatible with the
conventional fluoroelastomers. --> Chemical
Compatibility Table
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Pinch Valve Types
Universal Type
of Pinch Valve:
This type of pinch
valve has both N.O. and N.C. side, which are simultaneously operated. This
type of pinch valve can be configured for 3-way (dual tube), 2-way N.O.
(single tube) or 2-way N.C. (single tube) operation.
Installation of a tube in both sides is not required to have single-tube
operations.
Dual Type
of Pinch Valve:
This type of pinch
valve has both N.O. and N.C. side, which are simultaneously operated.
This
type of pinch valve can be configured for 3-way valve by using a Y-shaped fitting.
Installation of a tube in each side is required to secure normal operations.
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PPS (General Name: Polyphenylene
Sulfide)
PPS, a super engineering plastic, has high mechanical strength, high
temperature resistance (heat distortion temperature of 219°C
or higher) and high
chemical resistance against solvents etc.
--> Chemical
Compatibility Table
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PTFE Seals
Advantages:
The use of PTFE seals enables valves to have
high chemical resistance and high heat resistance. The
another advantage of the PTFE seal is its non-adhesive property (anti-stick property),
and the surface of the PTFE seal is easily washed down.
Precaution:
Because PTFE is very sensitive to foreign particles such as dusts, the installation of
filters is required in order to prevent foreign particles from entering into the
system.
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Resistance Method
The method for measuring a coil temperature
rise:
Since the value of a coil temperature rise is
easily effected by ambient temperature, measuring temperature on the surface of
a coil cannot yield any accurate measurements. Thus, the mean temperature is
determined by the resistance method using the temperature coefficient of resistance
of copper.
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Formula
T2
=
(R2/R1
- 1)
x (234.5
＋
T1)
+ ΔT
R1:
initial resistance
R2:
final resistance after energization
T1: initial ambient temperature
T2:
coil temperature rise
ΔT: change
in ambient temperature from the beginning to the termination of energization
When the ambient temperature rises, ΔT is
subtracted. When the ambient temperature falls, ΔT is
added.
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Thread Sizes
Thread Types
Commonly used threads having the triangular
cross sections for fastening are the metric screw threads and the Unified screw
threads. Based on the pitch of the thread, there are coarse threads and fine threads while the pitches of
fine threads are shorter than the pitches of coarse threads. Pipe threads are
mainly used for the mechanical linkage to connect pipe parts and fluidic devices.
There are two types of pipe threads, parallel threads and taper threads.
Followings are the thread sizes often used by
us.
Metric Screw Threads
Coarse Threads: M5, M6, M12
Fine Thread: M8
Unified (Inch) Screw Threads
Unified Coarse (UNC): No.6-32UNC, No.10-24UNC
Unified Fine (UNF): No.10-32UNF, 1/4-28UNF
Pipe Threads
Taper Thread: Rc1/8, Rc1/4 ( R1/8 and R1/4 for the connecting pipe parts)
Parallel Thread: G1/8
* National Pipe Threads (US standard) are also available.
1/4-18NPT, 1/8-27NPT
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Technical
Terms