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Valco Instruments Co. Inc. Sales:
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261
general reference
Glossary
standoff
air actuator
valve
FERRULE
TUBING
NUT
FITTING BODY
SQUARE END OF
TUBING SEATS IN
SQUARE BOTTOM
OF PILOT
NO DEAD VOLUME
Standoff:
an extension between a valve and actuator which
allows the valve to be installed in a different temperature zone
from the actuator. Standoffs come in several different lengths.
Stator:
the stationary component of a valve. Typically, it contains
the fittings as well as one of the fluid sealing surfaces. In Valco
valves, the stator is called the valve body.
T
Tee:
a type of distribution fitting which connects three pieces of
tubing, arranging them in the pattern of a “T”.
Through-type bore:
a bore which is slightly larger than the OD
of the tubing which is used with the given fitting. A union
with a through-type bore allows the tube ends to butt directly
together, or for one tube to run completely through the fitting.
Denoted by suffix “T” in the product number. In order to assure
correct pilot lengths, we recommend that ferrules be made up
on the tubing in a standard union.
U
Union:
a fitting for connecting two pieces of tubing of the same
OD.
Unswept volume:
the volume of any portion of a fitting which
is in the flowpath but which is a different diameter than the
primary flow orifice through the tubing/fitting assembly, or
any area not directly swept by the fluid flow. This can also be
known as “dead volume” if it is very poorly swept.
W
Wetted surfaces:
the surfaces which are contacted by the sample
stream.
Y
Y:
a type of distribution fitting which connects three pieces of
tubing, arranging them in the pattern of a “Y”. Occasionally
referred to as a “wye”.
Z
Zero dead volume (ZDV):
describes a connection which does not
add volume to the system beyond what an extension of tubing
would in its place.
Zero volume:
while often used interchangeably with zero dead
volume, it ideally describes a fitting design in which there is
no internal volume, such as a through-type union designed to
butt-fit two pieces of tubing.
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Tel: 03 9762 2034
