Flow Switches Made in the U.S.A. · Serving Industry Worldwide
Optional Materials
Teflon®
Flow Switches
All wetted parts — body, bellows, and paddle — in Teflon® (PTFE) for complete resistance to corrosive acids, caustics, and aggressive solvents. Also offered in KYNAR® (PVDF).
Why Teflon?
Built for Corrosive Media
Standard carbon steel or stainless steel flow switches fail quickly in aggressive chemical environments. Teflon® (PTFE) is virtually inert to nearly all industrial chemicals — acids, bases, solvents, and oxidizers — making it the material of choice when the process fluid would attack any metal.
The PEECO Teflon switch uses the same proven paddle-and-bellows mechanism as the standard N Series — but with every wetted component replaced with PTFE. The aluminum NEMA 4X housing and micro-switch remain above the process connection, completely isolated from the corrosive media.
How It Works
Corrosion-Proof Detection
Corrosive Media Enters
Process fluid — acid, solvent, or aggressive chemical — contacts only Teflon-lined wetted surfaces. No metal-to-media contact occurs in the flow path.
Teflon Paddle Deflects
The all-Teflon paddle and bellows flex in response to flow velocity. The PTFE material resists chemical attack while maintaining the mechanical sensitivity needed for accurate trip points.
Switch Actuates
Deflection travels through the sealed stem to the micro-switch housed in the NEMA 4X aluminum enclosure — completely isolated from the corrosive media below.
Key Features
What Sets the Teflon Switch Apart
Full Chemical Resistance
All wetted parts — body, bellows, and paddle — are Teflon (PTFE). No metal contacts the process fluid.
Teflon Bellows Seal
The Teflon bellows provides a hermetic, chemically inert seal between the process fluid and the switch mechanism.
Special O-Ring Groove
A precision O-ring seal is fitted into a machined mechanical groove in the body for a leak-free connection at the process connection point.
NEMA 4X Enclosure
0.062" thick heat-treated aluminum T-356 housing provides weatherproof protection for the electrical components above the process connection.
KYNAR® Alternative
Also offered in KYNAR® (PVDF) for applications where PTFE is not suitable — including certain solvents and high-purity semiconductor processes.
Teflon-Lined Option
Teflon-lined body variants are also available for applications requiring a metallic body with corrosion-resistant interior surfaces.
Typical Applications
Where Teflon Switches Are Specified
Also Available
KYNAR® (PVDF) Option
For applications where PTFE is not suitable — including certain ketones, esters, and high-purity semiconductor processes — PEECO also offers the same switch configuration in KYNAR® (polyvinylidene fluoride). KYNAR provides excellent resistance to chlorinated solvents and UV radiation, and is approved for use in many semiconductor and pharmaceutical applications.
Specifications
Technical Data
Operating Specifications
Materials of Construction
Ready to Specify a Teflon Switch?
Submit your application details — media, pressure, temperature, and flow rates — and our sales team will confirm the right Teflon or KYNAR configuration for your process.