How Hubbell Pressure switches works? – Emergency Sales & Service
The pressure
switch is an important component in most of our electric models. It is the
electric counterpart to the assigned unloader valve. In this blog, we will look
at how it works, what it is, and how to adjust?
Hubbell pressure switches are used in a number of
applications, assembly, and operation of an electric air compressor.
Knob/Off
level
Auto-off/lever which is also known as the knob is
used to manually separate the contacts. It is important to turn it to the off
position before pluggin in or unplugging the air compressor
Terminals
The terminals are the points where the incoming and
outgoing energy and power leads are connected to the pressure switch.
Contacts
The contacts are made from a conductive material
that consists of 90% silver and 10% nickel; it is used to complete the
electrical circuit and allow power to the motor. If it gets separates, the
circuit is broken and it will turn off.
Diaphragm
This is made of a flexible material that pushes
against the block as air pressure increases. If the specified cut-out pressure
is reached, then it forces the contacts apart and shuts down the motor.
Pressure
switch relief valve
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| Hubbell pressure switches |
The Hubbell pressure switch relief valve is located
on the base of the switch and is plumbed into the top of the check valve with a
copper or nylon tube. Once the pressure switch separates, the lever actuates
this valve to relieve the pressure that was trapped between the pump and the
check valve.
Adjustment
Springs
In Hubbell pressure switches, it is used to increase
and decrease the cut-in and cut-out pressure settings. Some pressure switches
have a secondary spring that will adjust the cut-out pressure without affecting
the cut-in setting.
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