MACS Monthly Newsletter - 2020 - JAN5

These are by far the most common in use today,
but there are others too. Germany's VDA has their
own valve core specs which are popular on European models.
We also have what's called a "primary seal" valve
that has thrown off quite a few technicians when
trying to figure it out. Its valve element is permanently assembled into the port with a half-round

© Schrader Pacific

© Schrader Pacific

you wanted to change a valve, you had a box full of
them, and you just threw away the old one and put
in a standard valve.
That's not the case anymore. Today there are between 16 and 18 different choices, but for the majority of what you'll see in US-spec systems, they can
be classified into 4 major categories. See Figures
9-12.

Figure 9: Standard Core: This is the core everyone's
used to seeing. It was the original valve core invented by
Schrader back in the 1890s and is still the most widely
used valve core style, being used today in everything from
A/C systems and fuel rails to air compressors and tire
valve stems.

© Schrader Pacific

© Schrader Pacific

Figure 11: 8mm Core: Used in the low side service port,
it's a "high-flow" core similar in design to the 10mm core.

Figure 12: JRA Core: Specified by the Japan Refrigeration
Association, these valves are similar in design to the 10mm
core, but with a notable difference in the depressor pin and
spring configuration which some consider to be more delicate.

Figure 10: 10mm Core: Most commonly found in the
high side service port, it provides the largest opening size
to allow for high flow rates, which helps OEMs to quickly
evacuate and fill the A/C system on the assembly line.

January 2020

5

MACS Service Reports



MACS Monthly Newsletter - 2020

Table of Contents for the Digital Edition of MACS Monthly Newsletter - 2020

MACS Monthly Newsletter - 2020 - JAN1
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