154
Check Valves &Pressure Regulators
PressureRelief Valves
Prevent system over-pressurization
Upchurch Scientifc
®
Pressure Relief Valves are ideal for preventing
systemover-pressurization. Theseproducts protect systemcomponents
by diverting fuid fow automatically when inline pressure exceeds the
set limit. Choose between preset 100 psi (7 bar) and 5 psi (0.3 bar)
assemblies, both shipped with Flangeless Fittings. The 100 psi version
is a good, general purpose valve, while the 5 psi version is perfect for
protecting syringe and peristaltic pump systems (see pages 93–108).
The void volume of both relief valves is low due to the small 0.020”
(.50 mm) thru-holes in the valve tee body.
If you wish to have the Pressure Relief Valve open at a different pressure
than 5 or 100 psi, simply combine one of the other replacement
Back Pressure Regulator Assemblies listed on page 152 with the
P-612 Pressure Relief Valve Tee. Choose the P-612S for larger bore
tubing and higher fow applications.
Ultra-LowVolumeBackPressureRegulators (BPR)
Wetted fow path materials: PEEK
™
, perfuoroelastomer, and ETFE
Available pressure settings of 100 or 500 psi (7 or 34 bar)
Low swept volume of only 6 µL
Ultra-LowVolumeBack PressureRegulators
(BPRs) were developed to minimize swept
volume, which is especially important
for multi-detector applications. With a
maximum swept volume of only 6 µL*,
it is nearly impossible to detect these
BPRs as part of your f luid pathway
(please see “Difficult to Detect” below
for more details). To minimize the swept volume added to your fow
path, we recommend trimming the length of the attached tubing.
And because the fow path is completely polymeric, you are assured
of biocompatibility.
Please Note: Our Ultra-Low Volume Back Pressure Regulators cannot
be used as check valves due to their unique internal design. Try our
Micro-Volume Inline Check Valve on page 149.
* The maximum internal swept volume listed above is for the back pressure regulator only and does not
include the volume of the attached tubing lines.
Back Pressure Regulators
and Pressure Relief Valves
Back Pressure
Setting
psi (bar)
Flow Rate
Recommendations
Recommended
Pressure Range
psi (bar)
1/16” OD
Tubing
M-410 100
2
(7)
2
Optimal: 100 µL–1 mL/min
Max.: 4 mL/min
40–150 (3–10)
PEEK, 0.010” ID
M-412 500
2
(34)
2
Optimal: 100 µL–1 mL/min
Max.: 4 mL/min
250–525 (17–36) PEEK, 0.010” ID
M-420 100
3
(7)
3
Optimal: 3–8 mL/min
Max.: 10 mL/min
40–150 (3–10)
PEEK, 0.020” ID
1
All data generated using water at room temperature
2
Set at a fow rate of 0.5 mL/min
3
Set at a fow rate of 5 mL/min
Specifcations
P-612
Pressure Relief Valve Tee
Includes Flangeless Fittings
for 1/16” OD tubing
(Drawing is not actual size)
U-455
Pressure Relief Valve
Includes Flangeless Fittings
for 1/16” OD tubing
(Drawing is not actual size)
1.0”
(2.54 cm)
2.50”
(6.35 cm)
M-410
MicroVolume
BPR Assembly
Attached tubing not shown
0.81”
(2.06 cm)
1.30”
(3.30 cm)
Part No. Description
Pressure
Setting
Tubing
OD
Includes
Swept
Volume
Ultra-Low Volume BPRs
M-410 Low Flow
100 psi (7 bar) 1/16” XP-230
6µL
M-412 Low Flow
500 psi (34 bar) 1/16” XP-230
6µL
M-420 High Flow
100 psi (7 bar) 1/16” XP-230
6µL
PRESSURE RELIEF VALVES
U-455 Pressure Relief
Assembly
5 psi (0.3 bar) 1/16” XP-201
148 µL
U-456 Pressure Relief
Assembly
100 psi (7 bar) 1/16” XP-201,
wrenches
139 µL
P-612 Pressure
Relief Tee
1/16” XP-201
14 µL
P-612S Pressure
Relief Tee
3/16” XP-201
348 µL
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FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com