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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Avantor® Hichrom PEEKsil™, Back Pressure Regulator

Supplier: Avantor

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

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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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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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Non-return valve

Supplier: Brand

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

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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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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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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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Air valve anti-return

Supplier: QVF LABORTECHNIK

Air valve anti-return, cone size 14/23 NS, without sidearm, Borosilicate glass 3.3

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Precision sampling valves for vials, Mininert®

Supplier: Restek

Mininert® valves are very convenient for repetitive sampling and limit content exposure to the silicon septum. The crimp-top valve for 20 mm ID glassware slides into the neck of the vial.

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Back pressure regulators

Supplier: Restek

Backpressure regulators can improve detector performance by preventing bubble formation in the detector flow cell. They also are useful in post-column reaction lines and between detectors and fraction collectors in preparatory work. Regulators are superior to more specific alternative solutions like small bore tubing, in which pressure varies with flow rate.