139
Valves
Application Note
Adapters for Syringe Needles
NeedlePort Accessories
The Rheodyne
®
adaptable Loop Filler Ports (Part #7012 and 9012) are
used to load sample from syringe needles or luer tips. TheNeedle Port
(Part #9013) conserves sample by minimizing the volume between the
needle and the valve.
9125-076
7125-054
9012
9013
7012
ValveAdapter for 10-32Ports
For 1/32” OD stainless steel tubing
Low swept volume
Extends the life of the rotor
As a result of customer requests, a Valve Adapter for 10-32 ports was
designed specifcally for use with 1/32” OD stainless steel tubing.
This product extends the life of and prevents damage to the rotor,
guarding against such potential hazards
as tubing that may pass through the
stator and scratch the rotor. This adapter
has a very low swept volume, at 300 nL.
The all-PEEK
™
fluid pathway ensures
biocompatibility.
M-400
Valve Adapter
(Includes indicated products)
Tubing Seal
Ferrule Assembly
Micro Seal
P-416
Nut
1/32” OD
Tubing
(not included)
F-112
Micro
Ferrule
MicroFilter
Body
M-400
Using Proper Syringe Needles
With front-loading injectors it is important to use the correct needle when
loading the sample loop. An incorrect needle will damage the valve and
can cause poor reproducibility. When the needle is too short the tip will
not reach the needle seal. When the needle is too small in diameter the
seal will not grip tightly enough. Needles with a beveled tip can damage
the rotor seal and stator face assembly (see Figure 1). The needle should be
#22 gauge (0.028” – 0.0285”/ 0.72 mm), and 90° point style (square cut end).
Model 3725 requires a #16 gauge (0.0645” – 0.0655”/ 1.65 mm) needle.
Never use a beveled, pointed, or tapered needle.
Needle specifcations are not critical when using a Loop Filler Port to load
the sample loop. However, it is important to tighten the needle port ftting
around the needle if using a syringe needle with a slightly smaller diameter
than 0.7 mm (0.028”).
If the loading method used is complete-flling, a syringe without a needle can
be used. A syringe ftted with a Needle Port Cleaner can be used with a front-
loading valve (Figure 2A) or with a Loop Filler Port (Figure 2B).
Needle port accessories are listed on this page.
Figure 1
A square cut needle:
(A) stops against the stator
face assembly; The tip of
a pointed needle
(B) slips into the stator face
and the tip breaks off as the
valve rotates
A
B
rotor seal
needle seal
needle
needle port tube
stator face assembly
rotor seal
needle seal
needle
needle port tube
stator face assembly
A
Figure 2
(A) Syringe ftted with Needle Port Cleaner
(Part # 7125-054) loading a front-loading
valve (model 7725)
(B) loading a Loop Filler Port (Part # 7012)
B
Part No. Description
Needle Port Accessories
7012
Stainless Steel Loop Filler Port
7125-054 Needle Port Cleaner
9012
PEEK Loop Filler Port
9013
PEEK Needle Port
9125-076 Suction Needle Adapter (for Model 9725)
Valve Adapter for 10-32 Ports
F-112
Replacement MicroFerrule for M-400, Natural PEEK
M-400
Valve Adapter Assembly
P-416
Replacement Female Nut for M-400, Natural PEEK
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com