Obviously,
valves operate in different mechanisms. Majority of valves can be manipulated
by manually turning, but there are valves that operate by temperature or
pressure. Manually operated valves are used in simple transport applications
involving non-abrasive fluids like water and oil. This type of valve, on the
other hand, is not used for large-scale applications using bulky pipelines.
Large, automatic or power-driven valves are used instead.
Solenoid
valves are examples of valves used for regulating high fluid flow. This type of
valve consists chiefly of a solenoid and a long, flimsy loop of wire which
produces a strong magnetic field when current is applied. The electromagnetic
field turns the solenoid into a magnet that can create a controlled linear
force. This refers to different transducers that convert electrical energy to
mechanical energy.
Other
important parts of a solenoid valve include piston, plunger, springs, and
diaphragm. The piston is the metal tube that contains the plunger. The solenoid
turns it into an electromagnet to pull up and to release the plunger inside. It
serves as a dividing surface between the plunger and the coil. Except for the
diaphragm, the piston is typically made of hard corrosion-resistant metal.
A solenoid
produces a weak magnetic field that can pull the plunger up a bit. However,
when applied with direct current, it creates a string magnetic force that can
lift the plunger to a desirable elevation, which allows the fluid to flow
through the ports. Large solenoid valves such as the Spence E5 Valve are
made of huge coils that require a considerable amount of current to produce the
necessary magnetism.
The plunger,
on the other hand, is partly suspended within the piston through springs on
both its ends. When current is applied to the coil, it moves up and pulls the
diaphragm upward to allow fluid to enter the ports. When the source of
electricity is shut down, the lounger travels back in place and covers the
port. This device is employed in valves like the Spence E5 Valve.
The amount of fluid to go
through the port is usually determined by how long current is applied on the
coil. When the pipeline is closed and fluid is not flowing, the plunger is down
and the power supply is shut down. This mechanism presents a number of
advantages, including immediate response to fluid flow and does not require
direct human intervention. This is why solenoid valves like
Spence PRV
are widely used.