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About Solenoid Valves
Solenoid valves and solenoid water valves are electrically
operated devices that control the flow of liquids. Solenoid valves are
electro-mechanical devices that use a wire coil and a movable plunger,
called a solenoid, to control a particular valve. The solenoid controls
the valve during either the open or closed positions. Thus, these kinds
of valves do not regulate flow. They are used for the remote control
of valves for directional control of liquids. Solenoid water valves have
two main parts: the solenoid and the valve. After the coil receives a
current, the actuating magnetic field is created. The magnetic field
acts upon the plunger resulting in the actuation of the valve, either
opening or closing it.
Solenoid valve manufacturers produce two general types: direct-acting
and pilot-operated. Direct-acting solenoid valves have a plunger that
is in direct contact with the primary opening in the body. This plunger
is used to open and close the orifice. The pilot-operated solenoid valve
works with a diaphragm rather than a plunger. This valve uses differential
pressure to control the flow of fluids. The air-venting valve is opened
to allow the pressure to equalize and permit the fluids to flow through.
Solenoid valve manufacturers design their products for many applications.
Their most common use is as solenoid water valves, oil valves, gas valves,
steam valves, solvents valves, cryogenics valves, air and vapors valves,
as well as many other applications as hydraulic valves and pneumatic
valves. Typical environments for solenoid valves are in medical and biomedical
equipment, analytical instrumentation, semiconductors, HVAC and other
industrial OEM environments. A unique feature that solenoid valve manufacturers
equip their products with is an automatic triggering from remote locations
by different voltages, making them useful in rough or hazardous locations.
Important items to consider when looking at solenoid valves are proportionality,
linearity, frequency response, repeatability, power consumption, leakage,
life expectancy and cost. With so many types of solenoid valves and other
related valves, the application requirements are very important. Because
solenoid valves are designed to perform operations, ranging from water
valves, air valves, pneumatic valves, or used in applications such as
ones to restrict, meter and maintain the flow of liquid and gaseous materials,
they are widely used in vastly different fields and industries.
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Types of Solenoid Valves
- are used for hydraulic and
pneumatic applications. 2-Way solenoid valves have two ports called
pressure and service ports.
- are for hydraulic and pneumatic
applications. 3-Way solenoid valves have three ports, one being the
pressure port, one the tank and the last, the service port.
- are control air flow in a pneumatic system.
- regulate the release of air.
- use fluid pressure and are ported through the return
line to the reservoir.
- fit easily into a
small area and also measure or dispense small amounts of material.
Mini solenoid valves are particularly useful in medical applications.
- are primarily used in applications that involve corrosion
or chemicals.
-
are similar to the hydraulic version in that they both use pressure.
However, the return port of a pneumatic valve, which uses air, is exhausted
to the atmosphere.
- have direct-acting control valves with linear characteristics.
Proportional solenoid valves control accuracy, hysteresis and repeatability
within close tolerances.
- have three bearing
balls that ride on an inclined plane and turn linear motion into
rotary motion. The magnetic arrangement permits direct rotational motion.
- are electrical devices that control water flow.
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