Gems Piston Type Flow Switches
For Low Flow Rates in Liquids and Gases
Models for liquid flow rates as low as 50 cc/min. and gas flow rates as low as 2 SCFH.
Small, compact housings with port sizes from 1/4" NPT
Precision built for superior accuracy
Applications:
Protect your expensive electronic equipment from coolant flow failure on:
Laser Heads • Welders • Power Supplies • High Speed Spindles • X-Ray Tubes • Semiconductor Equipment
Assure proper lubrication flow to critical bearings or gears to prevent system downtime on:
Presses • Rotating Equipment • Conveyors • Machine Tools • Robotics
Ensure system integrity in processing and dispensing equipment on:
Water Purification and Filtering • Beverage Dispensing • Chemical Additives • Gas Sampling • Distilling
| Part Number | Flow Setting | Body Material | Port Size | Switch TypeSPST, N.O. = Normally Open dry | |
| (GPM) | SPST, N.C. = Normally Closed dry | ||||
| SPDT = Single-pole Double Throw | |||||
| 168433 | 0.5 | Brass | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 168434 | 1 | Brass | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 168435 | 1.5 | Brass | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 177592 | 0.25 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 177593 | 0.5 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 177594 | 1 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 177595 | 1.5 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 178353 | 2 | Brass | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 179992 | 0.25 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 179993 | 0.5 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 179994 | 1 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 179995 | 1.5 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 179996 | 2 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 181130 | 0.15 | Brass | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 192562 | 0.25 | Brass | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 192563 | 0.5 | Brass | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 192564 | 1 | Brass | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 192566 | 1.5 | Brass | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 192567 | 2 | Brass | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 193482 | 0.15 | 316 Stainless Steel | 3/8" NPT Male | SPST, N.O. (20VA) | |
| 204710 | 0.5 | 316 Stainless Steel | 1/2" Tube Compression | SPST, N.O. (20VA) | |
| 204711 | 1 | 316 Stainless Steel | 1/2" Tube Compression | SPST, N.O. (20VA) | |
| 204712 | 1.5 | 316 Stainless Steel | 1/2" Tube Compression | SPST, N.O. (20VA) | |
| 204713 | 2 | 316 Stainless Steel | 1/2" Tube Compression | SPST, N.O. (20VA) | |
| 204714 | 3 | 316 Stainless Steel | 1/2" Tube Compression | SPST, N.O. (20VA) | |
| 204715 | 0.5 | 316 Stainless Steel | 3/4" NPT Male | SPST, N.O. (20VA) | |
| 204716 | 1 | 316 Stainless Steel | 3/4" NPT Male | SPST, N.O. (20VA) | |
| 204717 | 1.5 | 316 Stainless Steel | 3/4" NPT Male | SPST, N.O. (20VA) | |
| 204718 | 2 | 316 Stainless Steel | 3/4" NPT Male | SPST, N.O. (20VA) | |
| 204719 | 3 | 316 Stainless Steel | 3/4" NPT Male | SPST, N.O. (20VA) | |
| 206915 | 0.5 | 316 Stainless Steel | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 206916 | 1 | 316 Stainless Steel | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 206917 | 1.5 | 316 Stainless Steel | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 206918 | 2 | 316 Stainless Steel | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 206919 | 3 | 316 Stainless Steel | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 212136 | 0.15 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 225525 | 2 | 316 Stainless Steel | 3/8" Tube Compression | SPST, N.O. (20VA) | |
| 239688 | 2 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 239689 | 1.5 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 239690 | 1 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 239691 | 0.5 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 239692 | 0.25 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 239693 | 0.15 | 316 Stainless Steel | 1/2z' Barb | SPST, N.O. (20VA) | |
| 25357 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 25358 | 0.50 - 20 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/2" NPT Female | SPDT (20VA) |
| 25359 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 25360 | 0.50 - 20 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/2" NPT Female | SPDT (20VA) |
| 25363 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 25364 | 0.50 - 20 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/2" NPT Female | SPDT (20VA) |
| 25365 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 25366 | 0.50 - 20 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/2" NPT Female | SPDT (20VA) |
| 26914 | 0.1 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26915 | 0.25 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26916 | 0.5 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26917 | 0.75 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26918 | 1 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26919 | 1.5 | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26926 | 0.1 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26927 | 0.25 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26928 | 0.5 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26929 | 0.75 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26930 | 1 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26931 | 1.5 | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26938 | 0.013 (50 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26939 | 0.025 (100 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26941 | 0.045 (150 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26942 | 0.055 (200 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26943 | 0.065 (250 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26944 | 0.075 (300 cc/min) | Air flow settings available (please consult factory). | Brass | 1/4" NPT Female | SPDT (20VA) |
| 26951 | 0.013 (50 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26952 | 0.025 (100 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26953 | 0.045 (150 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26954 | 0.055 (200 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26955 | 0.065 (250 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26956 | 0.075 (300 cc/min) | Air flow settings available (please consult factory). | 316 Stainless Steel | 1/4" NPT Female | SPDT (20VA) |
| 26969 | 0.1 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 26970 | 0.25 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 26971 | 0.5 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 26972 | 0.75 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 26973 | 1 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 26974 | 1.5 | 316 Stainless Steel | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 49073 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 51582 | 0.1 | Brass | 1/4" NPT Female | SPDT (20VA) | |
| 51586 | 0.25 | Brass | 1/4" NPT Female | SPDT (20VA) | |
| 51590 | 0.5 | Brass | 1/4" NPT Female | SPDT (20VA) | |
| 51594 | 0.75 | Brass | 1/4" NPT Female | SPDT (20VA) | |
| 51598 | 1 | Brass | 1/4" NPT Female | SPDT (20VA) | |
| 61205 | 0.50 - 20 | Air flow settings available (please consult factory). | Brass | 1/2" NPT Female | SPDT (20VA) |
| 70820 | 0.1 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70821 | 0.25 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70822 | 0.5 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70823 | 0.75 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70824 | 1 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70825 | 1.5 | Brass | 1/4" NPT Female | SPST, N.O. (20VA) | |
| 70826 | 0.1 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 70827 | 0.25 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 70828 | 0.5 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 70829 | 0.75 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 70830 | 1 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 70831 | 1.5 | Brass | 1/4" NPT Female | SPST, N.C. (20VA) | |
| 122340 | 0.1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122341 | 0.25 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122342 | 0.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122343 | 0.75 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122344 | 1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122345 | 1.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.O. (20VA) |
| 122346 | 0.1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122347 | 0.25 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122348 | 0.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122349 | 0.75 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122350 | 1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122351 | 1.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPST, N.C. (20VA) |
| 122352 | 0.1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 122353 | 0.25 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 122354 | 0.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 122355 | 0.75 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 122356 | 1 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 122357 | 1.5 | 90º Flow Path | Ryton | 9/16"-18 UNF-2B | SPDT (20VA) |
| 129660 | 0.5 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129661 | 1 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129662 | 2 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129663 | 3 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129664 | 4 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129665 | 5 | Polypropylene | 1/2" NPT Male | SPST, N.O. (20VA) | |
| 129666 | 0.5 | Polypropylene | 1/2" NPT Male | SPST, N.C. (20VA) | |
| 129667 | 1 | Polypropylene | 1/2" NPT Male |
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