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Check Valves &Pressure Regulators
Back PressureRegulators (BPRs)
Proven outgassing protection
Flow-independent pump preload for greater pump effciency
5 to 1,000 psi cartridges and assemblies available
Back Pressure Regulators aredesigned to enhance systemperformance
through outgassing prevention and improved pump check valve
effciency.
Upchurch Scientifc
®
back pressure regulators include:
5 and 20 psi assemblies
(replacement cartridges not available)
40, 75, 100, 250, 500, 750 and 1,000 psi
cartridges and assemblies
PEEK
™
and stainless steel BPR holders
High pressure adjustable BPR for pressures
between 2,000 and 5,000 psi
Ultra low volume BPRs set to 100 and 500 psi (page 154)
Please Note: For fow control options try the Micro-Metering Valves
found on page 147.
BPRAssemblies
Choose from our line of Biocompatible and Stainless Steel BPR
Assemblies, each complete with a replaceable, factory preset cartridge
(except the 5 and 20 psi versions).
Upchurch Scientific BPR Assemblies create incremental back
pressures ranging from5 to 1,000 psi (0.3 to 69 bar). The Biocompatible
BPR Assemblies feature a PEEK holder; polymer-based fittings;
biocompatible BPR cartridges and wrenches for tightening. Stainless
Steel BPR Assemblies feature the same biocompatible BPR cartridges
with a 316 stainless steel holder and polymer fttings.
Biocompatible Back Pressure Regulator Holder, shown with available Cartridges
0.43”
(1.09 cm)
1.04”
(2.64 cm)
1.90”
(4.83 cm)
U-609
500 psi BPR
shown with P-765
Cartridge
1.92”
(4.88 cm)
0.42”
(1.07 cm)
P-790
5 psi BPR
(sold as assembly only)
Flangeless Ferrule
Cartridge Holder
Cartridge
Color-Coded End Cap
Flangeless Nut
Each BPR Assembly includes
a preset BPR Cartridge and
Upchurch Scientifc fttings
for 1/16” OD tubing.
Order Online
www. idex-hs .com
Back Pressure Regulators
Application Note
Small gas bubbles often form as solvent moves from the high pressure of an
HPLC column to the low pressure environment leading to the detector. This
outgassing can cause erratic baseline readings and loss of sensitivity. Placing an
Upchurch Scientifc BPR (usually a 40 – 100 psi) after the detector provides an
excellent, low-cost method for reducing this problem by maintaining enough
back pressure on the mobile phase to keep gases dissolved in solution.
A back pressure regulator can also be used as a pump preload for low and
fuctuating pressure applications. Many of today’s pumps require a steady back
pressure to function properly. Install an Upchurch Scientifc BPR (usually 500–
1,000 psi) between the pump and the injector to enhance pump performance.
Caution: Do not exceed the maximum operating pressure of your system—
please refer to the operating manuals for your system components before
choosing the appropriate BPR.
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com