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Non Return Valves

106  results were found
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, with spring loaded, creating a quality product that will remain independent for years with no need for replacement.


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Description:   This polypropylene non-return valve protects tubing and vacuum systems from back flow when pressure falls in the system. The recommended working pressure range for this valve is 1.0 to 28.4 psi. Nominal O.D.: 8/9/10mm. Crest O.D.: 7.8/10.0mm.
Catalog Number: 46600-040
Supplier: VWR International



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Description:   Back pressure regulator
Catalog Number: 76399-160
Supplier: HICHROM LIMITED



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Description:   Cs/6, Sp/1
Catalog Number: 71000-288
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   Cs/6, Sp/1
Catalog Number: 71000-284
Supplier: Ace Glass


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Description:   3-WAY TEFZEL VALVE OMNIFIT.
Catalog Number: 89077-462
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   Cs/6, Sp/1
Catalog Number: 71000-282
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   PTFE VALVE WITH ONE 1/4" MALE MALE-LUER CONNECTION AND ONE 1/4" FEMALE NPT CONNECTION.
Catalog Number: 89052-608
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   CONNECTION VALVE UNIVERSAL PTFE.
Catalog Number: 89077-466
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   8-WAY VALVE TEFZEL OMNIFIT.
Catalog Number: 89077-464
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   Cs/6, Sp/1
Catalog Number: 71000-286
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 1/4" Female NPT
Catalog Number: 10099-050
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 1/8" Female NPT
Catalog Number: 10099-046
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 3/4" Female NPT
Catalog Number: 10099-062
Supplier: Ace Glass


Small Business Enterprise

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Description:   Tefzel Pk2
Catalog Number: 89097-278
Supplier: Ace Glass


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Description:   PTFE Stopcock Valve, Two Way, 3/4" Tube Compression
Catalog Number: 10099-064
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 1/2" Female NPT
Catalog Number: 10099-058
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 1/2" Tube Compression
Catalog Number: 10099-060
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 3/8" Female NPT
Catalog Number: 10099-054
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 3/8" Tube Compression
Catalog Number: 10099-056
Supplier: Ace Glass


Small Business Enterprise

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Description:   PTFE Stopcock Valve, Two Way, 1/8" Tube Compression
Catalog Number: 10099-048
Supplier: Ace Glass


Small Business Enterprise

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Catalog Number: 21528-210
Supplier: Upchurch Scientific



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Description:   Z2 PEEK Caps Ceramic Ball/Seat 2PK
Catalog Number: 97056-514
Supplier: Optimize



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Catalog Number: 77100-280
Supplier: Optimize



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Description:   0-14 drain valve only, 1in beaded pipe with 1/2in swagelock sidearm
Catalog Number: 89209-350
Supplier: Chemglass


Small Business Enterprise

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Description:   Outlet Check Valve for Shimadzu LC-10ADvp, LC-10A Tvp, Similar to Shimadzu# 228-34976-91
Catalog Number: 10853-270
Supplier: Restek



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Description:   Material; Valve - PEEKFittings - PEEK/ETFE Valve, 1-way, 1/4-28 Threads, with 1/16" Flangeless Fittings The following tubing nuts and ferrules are required to make the initial tubing connections to the end fittings of Chromaflex AQ and Chromaflex OR Columns.
Catalog Number: KT420817-3306
Supplier: DWK Life Sciences (KIMBLE)



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Description:   Prime/Purge Valve for HPLC, 1/4-28 Flanged Seat, Material: Stainless Steel, with Tubing and Fittings, low internal volumes and are rated to 15,000 psi (103,421 kPa), two-piece stem assembly in which the rotating upper shank is coupled through a ball joint
Catalog Number: 10853-602
Supplier: Restek



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Catalog Number: 77100-696
Supplier: Optimize



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Catalog Number: 77100-692
Supplier: Optimize



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Description:   For 1/8 inch OD tubing 1/4-28 threads, Tefzel* (ETFE), .040 inch thru-hole, blue
Catalog Number: 21511-232
Supplier: Upchurch Scientific



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Description:   Ball Valve
Catalog Number: 10058-920
Supplier: Restek



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Description:   PEEK* Holder with PEEK/Tefzel* Cartridge, 1/4-28 Tefzel Flangeless Fittings for 1/16 OD Tubing, Wrenches
Catalog Number: 21511-586
Supplier: Upchurch Scientific



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Description:   Ball Valve
Catalog Number: 10855-722
Supplier: Restek



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Description:   For 1/16 inch OD tubing with Delrin*/Tefzel* fittings & wrenches, 100 psi (7 bar)
Catalog Number: 21511-532
Supplier: Upchurch Scientific



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Description:   PTFE VALVE WITH TWO 3/8" FEMALE NPT CONNECTIONS.
Catalog Number: 89052-618
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   For select models from ABI/Kratos, Gilson*, HP/Agilent*, LDC/Milton Roy, PerkinElmer*, Integral 4000, Spectra-Physics*, Isochrom, P-Series, the SSI 200 Series Model 300, Varian* models 2010, 9000 Star, 9010, 9012, Waters* 100, 225uL systems. Stainless steel, 3.2mm.
Catalog Number: 77100-286
Supplier: Optimize



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Description:   Outlet housing. Stainless steel cartridge. Red 3.2mm ball. For use with Hewlett-Packard* HPLC systems, models 1050, 1100.
Catalog Number: 77100-702
Supplier: Optimize



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Description:   Hitachi* 655, L-600, L-6200/L-6200A, L-7100 (LaChrom), LKB 2150, 2248, Shimadzu LC-600, LC-9A, LC10AD (and ESA 580), LC-10ADVP, LC-10AT, LC-10ATVP, Waters* 2690/Alliance, Varian 616. Stainless steel, 1.6 mm.
Catalog Number: 77100-278
Supplier: Optimize



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Catalog Number: 77100-292
Supplier: Optimize



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Description:   Angle Valve for HPLC, 1/16 inch Fittings, 1/4-28, Material: Stainless Steel, Includes: Nuts and Ferrules, low internal volumes and are rated to 15,000 psi (103,421 kPa), two-piece stem assembly in which the rotating upper shank is coupled through a ball joint to a static lower stem
Catalog Number: 10853-750
Supplier: Avantor



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Description:   Ball Valve
Catalog Number: 10855-016
Supplier: Restek



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Description:   Ball Valve
Catalog Number: 10855-720
Supplier: Restek



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Description:   Back Pressure Regulator, 100 psi (7 bar) PEEK*/Tefzel*, Tan/Red, for Upchurch Scientific Back Pressure Regulator Holders
Catalog Number: 21511-588
Supplier: Upchurch Scientific



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Description:   For HP/Agilent* 1050, 1100. Stainless steel.
Catalog Number: 77100-700
Supplier: Optimize



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Description:   Prime/Purge Valve Repair Kit for Prime/Purge Valve, Includes: soft seal (2), PTFE O-ring (2), 7/32 hex key
Catalog Number: 10853-752
Supplier: Restek



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Description:   with 1000 psi (69 bar) Cartridge
Catalog Number: 53521-124
Supplier: Upchurch Scientific



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Description:   PTFE VALVE WITH ONE 1/4" OD TUBE CONNECTION AND ONE 1/4" FEMALE NPT CONNECTION.
Catalog Number: 89052-612
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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Description:   Material; Valve - ETFEFittings - ETFE Valve, 1-way, 1/4-28 Threads, with 1/8" Flangeless Fittings The following tubing nuts and ferrules are required to make the initial tubing connections to the end fittings of Chromaflex AQ and Chromaflex OR Columns.
Catalog Number: KT420817-2313
Supplier: DWK Life Sciences (KIMBLE)



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Description:   PEEK* Holder with PEEK/Tefzel* Cartridge, 1/4-28 Tefzel Flangeless Fittings for 1/16 OD Tubing
Catalog Number: 21001-206
Supplier: Upchurch Scientific



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Description:   1/4-28 threads, .02 inch thru-hole, Perfluoroelastomer O-ring
Catalog Number: 53501-028
Supplier: Upchurch Scientific



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Description:   Ultra-Low Volume, Low Flow, 500 psi (34 bar) With Flangeless Fittings & 1/16 OD PEEK* Tubing (.010 ID)
Catalog Number: 53501-020
Supplier: Upchurch Scientific



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Description:   Back Pressure Regulator, 500 psi (34 bar) PEEK*/Tefzel*, Tan/Green, for Upchurch Scientific Back Pressure Regulator Holders
Catalog Number: 21511-590
Supplier: Upchurch Scientific



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Description:   with Stainless Steel Holder with PEEK/Tefzel* Cartridge, 1/4-28 Delrin*/Tefzel Flangeless Fittings for 1/16 OD Tubing
Catalog Number: 21511-596
Supplier: Upchurch Scientific



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Description:   For use with Upchurch Scientific Back Pressure Regulator hardware, useful for applications where more efficient pump performance is needed through provision of strong pre-load pressure
Catalog Number: 97055-106
Supplier: Upchurch Scientific



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Description:   PerformancePLUS Check Valve Housing, for HPLC Systems, Model No: 1515, 1525, 510, 515, 525, 600, 610
Catalog Number: 10853-686
Supplier: Restek



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Description:   For Waters* 625/626 systems. Stainless steel, 1.6mm.
Catalog Number: 77100-282
Supplier: Optimize



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Description:   For Dionex DQP, GPM-1, GPM-2, DXP, AGP (Analytical), DRP, 2000, 4000, GP40/IP20*. PEEK*, 3.2mm.
Catalog Number: 77100-290
Supplier: Optimize



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Catalog Number: 77100-704
Supplier: Optimize



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Catalog Number: 77100-296
Supplier: Optimize



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Description:   PEEK cartridge. Red 1.6mm ball. For Bischoff 2200, Anspec SM909, and Alcott Micromeritics 760 microbore type HPLC systems.
Catalog Number: 77100-284
Supplier: Optimize



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Description:   Ball Valve, 2-Way, Straight
Catalog Number: 10854-528
Supplier: Restek



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Description:   Ball Valve
Catalog Number: 10855-718
Supplier: Restek



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Description:   Ball Valve
Catalog Number: 10855-636
Supplier: Restek



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Description:   PTFE VALVE WITH TWO 1/2" FEMALE NPT CONNECTIONS.
Catalog Number: 89052-620
Supplier: Ace Glass


Product available on GSA Advantage® Small Business Enterprise

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