Flow Switches Made in the U.S.A. · Serving Industry Worldwide
Optional Materials
Teflon-Coated
Flow Switches
Metal-backed flow switches with a factory-bonded Teflon® (PTFE) coating on all wetted surfaces. Higher pressure ratings than solid PTFE — available in flanged and wafer styles. Teflon-coated vane option available on all models.
Teflon-coated ≠ solid Teflon. The coating adds surface protection on a metal body — for highly aggressive acids, caustics, or solvents where bare metal would fail rapidly, consider the all-PTFE N Series instead. View Solid Teflon →
Why Teflon Coating?
Metal Strength. Teflon Surface.
When a process fluid is mildly corrosive, scaling, or prone to fouling bare metal — but not aggressive enough to require a fully solid PTFE body — a Teflon-coated switch is the right call. You keep the structural integrity and higher pressure ratings of the metal body while protecting every wetted surface with a chemically resistant PTFE layer.
The coating is factory-applied and bonded directly to the machined metal surface — not a loose liner or sleeve. Connection styles are limited to flanged and wafer because Teflon coating cannot be applied uniformly to pipe threads without compromising the seal integrity.
Operation
How It Works
Metal Strength, Teflon Surface
The body and wetted surfaces are machined from the standard metal substrate — carbon steel, stainless, or cast iron — then coated with a bonded Teflon (PTFE) layer. You get the pressure and temperature ratings of the base metal with a chemically resistant surface.
Coated Vane Deflects in Flow
Process fluid contacts the Teflon-coated vane and body surfaces. The coating prevents chemical attack and buildup on the paddle, maintaining consistent trip-point sensitivity even in mildly corrosive or scaling media.
Switch Actuates, Isolated Above
The micro-switch and housing remain above the process connection, completely isolated from the media. The Teflon coating handles the wetted zone; the proven PEECO switching mechanism handles the rest.
Full Body Coating
Available Models — Teflon-Coated Body
Flanged and wafer connection styles only. Add suffix -TC when ordering.
| Model | Series | Connection | Housing | Suffix | Notes |
|---|---|---|---|---|---|
| EP-F | E Series | Flanged | Explosion-Proof | -TC | Most common Teflon-coated model |
| NP-F | N Series | Flanged | General Purpose | -TC | Non-explosion-proof flanged |
| HP-F | H Series | Flanged | High Pressure | -TC | High-pressure flanged with coating |
| EP-W | E Series | Wafer | Explosion-Proof | -TC | Wafer-style for tight installations |
| NP-W | N Series | Wafer | General Purpose | -TC | Non-XP wafer with Teflon coating |
Vane-Only Option
Teflon-Coated Vane
When the body material is adequate for the service but the paddle is prone to corrosion, fouling, or chemical attack, the Teflon-coated vane option adds targeted protection without the cost of a full body coating.
Unlike the full body coating, the Teflon-coated vane is available on all PEECO models — including threaded connections. This makes it the most versatile corrosion-protection option across the entire product line.
Ordering Suffix
Add -TV to any model number for a Teflon-coated vane. Example: EP-S-TV (explosion-proof, threaded, Teflon vane).
All Flanged Models
Teflon-coated vane only, standard metal body
All Wafer Models
Teflon-coated vane only, standard metal body
Threaded Models
Vane coating available on threaded connections
What Sets It Apart
Key Features
Bonded PTFE Coating
Factory-applied Teflon coating bonded directly to the metal substrate — not a sleeve or liner that can shift or loosen under pressure.
Higher Pressure Than Solid PTFE
Metal-backed construction supports higher operating pressures than the all-PTFE N Series (100 PSI max). Flanged and wafer models follow the base metal pressure rating.
Flanged & Wafer Only
Teflon coating is not available on threaded connections — the coating cannot be applied uniformly to pipe threads without compromising the seal. Flanged and wafer styles are fully supported.
Teflon-Coated Vane Option
Available on all models — including threaded — the coated vane option adds corrosion resistance to the paddle alone, without coating the body. Ideal when the body material is adequate but vane fouling is a concern.
Mild to Moderate Corrosion
Best suited for mildly corrosive media, scaling fluids, or applications where a solid PTFE body is not required but bare metal would degrade. For highly aggressive acids or solvents, consider the all-PTFE N Series.
Standard PEECO Switching Mechanism
The same proven paddle-and-bellows mechanism used across the PEECO line. Teflon coating is a surface treatment — it does not alter the trip-point adjustment range, micro-switch ratings, or housing classification.
Where It's Used
Typical Applications
Choosing the Right Option
Coated vs. Solid PTFE
Use Teflon-coated when the media is mildly corrosive and you need higher pressure ratings or threaded connections. Use solid PTFE (N Series) when the media is highly aggressive — concentrated acids, strong caustics, or aggressive solvents — and the 100 PSI / 450°F limits are acceptable.
| Coated | Solid PTFE | |
|---|---|---|
| Body material | Metal + PTFE coat | All PTFE |
| Pressure rating | Per base model | 100 PSI max |
| Connection styles | Flanged, Wafer | Threaded (N Series) |
| Corrosion resistance | Mild–moderate | Highly aggressive |
| Vane coating | All models | N/A (all PTFE) |
Technical Data
Specifications
Ready to Specify?
Tell us your connection style, series, and whether you need full body coating (-TC) or vane-only coating (-TV). We'll confirm availability and lead time.