The specific torque called out for the installation
of a valve core is between 2 to 5 inch-pounds.
As you can see, it doesn’t take much to torque.
Make sure that you don’t strip out the threads
while installing a new valve core, and don’t
overtighten the valve stem core when installing
the new one. When the top portion of the
Schrader breaks off in the service port, the
section that’s left behind resembles a hollow
barrel. It is difficult to remove because there
is nothing to grab ahold of. Rather than scrap
the part, a T15 Torx driver can be used to extract
the barrel. With a light tap, the teeth on the
driver bite in to grip the soft brass of the broken
Schrader valve.
And finally, any time that a valve core is
removed from the valve body, it is standard
practice to install a new valve core and discard
the old one. This is also consistent with the
manufacturer’s recommendations.
accumulator should be Schrader part
number 2300TV. This valve has an operating
pressure from 0 to 2000 psi.
If you’re unfamiliar with these types of
valve cores, there are a couple of items that
can help you identify proper application. On
high-pressure valve cores it is common to
see the letter H stamped on the stem, into
the head of the valve pin. This is not easy to
see with the naked eye but is revealed with a
magnifying glass. In addition, the plug-sealing material is made from a black
molded nitrile rubber and the plunger-sealing material is typically a black nitrite
material. On the other hand, a valve core
used in an aviation tire application typically
has a white silicone plunger-sealing material
around the outside with a natural Teflon
plug-sealing material.
Many homebuilt, light-sport, and ultra-
light aircraft use valve cores made for
general purpose and commercial applica-
tions. These valve cores can have a white
silicone or a black nitrite plunger-sealing
material with a red or green Teflon plug-
sealing material. These are adequate for
many of these applications; however, they
are designed for operating pressures from 0
up to 200 psi.
