Non Return Valves

Our non-return valves protect tubing and vacuum systems from backflow when pressure falls in the system. Sealing system eliminates backflow, helping to prevent upstream contamination or damage. These valves are compatible with a wide range of systems, all with different specific levels when dealing with the three main pressure values: cracking pressure, maximum pressure, and back pressure created. Durable steel or plastics are used in all designs, creating a quality product that will remain independent for years with no need for replacement.

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Micro control valves

Supplier: Trajan Scientific and Medical

Micro control valves provide precision metering and on-off control of gas flows. They are designed specifically for chromatography applications and used at elevated temperatures from high vacuum to medium pressure.

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Avantor® Hichrom PEEKsil™, Back Pressure Regulator

Supplier: Avantor

Avantor® Hichrom, Back pressure regulator, Pressure: 5,17 bar

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Non return valves, BOLA

Supplier: Bohlender

These non return valves are made from PTFE, with nuts made from glass fibre reinforced PTFE for connecting tubing or tubes.

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Thermostatic mixing valve for eye showers

Supplier: BROEN-LAB

Thermostatic mixing valve for eye showers designed for delivering tepid water (20 to 25 °C).

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Vacuum check valve and positive connector, Nalgene®

Supplier: Thermo Fisher Scientific

These vacuum check valves with positive connector are designed to prevent back pressure with aspirator-type vacuum pumps.

Sustainable Options Available

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Non-return valves

Supplier: KARTELL

PP, translucent. Prevent pressure loss and backflow. Maximum working pressure 2 bar and minimum working pressure 0,07 bar at room temperature (20 °C).

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Non-return valve

Supplier: Brand

HDPE, transparent. Prevents backflow. With FKM valve disc not suitable for pressure applications.

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Non return valves

Supplier: VITLAB

These non return valves are made from HDPE.

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Non-return valves, SP Bel-Art

Supplier: Bel-Art Products, a Part of SP

PP valve, translucent with neoprene valve disk. Stops reverse flow of liquid when pressure is interrupted.

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Non return valves

Supplier: BURKLE

Translucent PP retaining valves with embossed directional arrow or printed in black. With tapered ends. Various uses.

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Non return valve, PP

Supplier: BURKLE

Valve made of PP and POM, seal made of EPDM, springs made of stainless steel 1.4401.

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Mass flow controllers and restrictors

Supplier: Agilent

Old style restrictor, 0 - 20 ml/min, red/silver colour

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Back pressure regulator

Supplier: Agilent

Back pressure regulator, 1 - 15 psi

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Non-return valve

Supplier: Lenz Laborglas

DURAN®, borosilicate glass, clear. Prevent pressure loss or backflow. Simple design, cannot be dismantled.

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Back pressure regulator

Supplier: VICI JOUR RESEARCH

This regulator installs on the detector drain line and prevents bubble formation in the flow cell during outgassing. It has an adjustable back pressure from 0 to 20 bar (15 to 300 psi) without disconnecting from the system. Other sizes available.

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Inline cartridge check valves, Upchurch Scientific®

Supplier: UPCHURCH SCIENTIFIC

Inline cartridge check valves are designed to limit flow in one direction and deliver a low cracking pressure. Ideal placement for these valves would be on the effluent side of the column to prevent post-column derivatisation agents from flowing back and poisoning the column if the HPLC mobile phase pump were to shut down.