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.
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.
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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, 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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Check valves for Shimadzu HPLC systems
Supplier: Restek
Replacement parts for Shimadzu HPLC systems.
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Valves for HPLC
Supplier: Restek
These valves have low internal volumes and are rated to 15000 psi. They feature a two-piece stem assembly in which the rotating upper shank is coupled through a ball joint to a static lower stem.
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Air valve anti-return
Supplier: QVF LABORTECHNIK
Air valve anti-return, cone size 14/23 NS, with sidearm, Borosilicate glass 3.3
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Check valves, ASI
Supplier: Restek
Outlet check valve, sapphire and ruby ball and seat, includes cartridge and housing
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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.