The S66 is a concentric lug butterfly valve with a PTFE lined seat, designed for pipelines where standard elastomer seats like EPDM/NBR are insufficient due to chemical compatibility issues. Primarily used as an isolation valve in chemical networks, treated water, dilute acids/alkalis, and industrial fluids, following fluid, concentration, and temperature checks.
Technical sheets indicate pressure up to 16 bar and temperature range from -20 to +180 °C. The product page mentions a general range of -40 to +200 °C, thus procurement should confirm permissible limits based on seat, disc, pressure, and chemical medium.
Available constructions:
The lug design is selected when mechanical retention with bolts per flange or line section maintenance is required. End-of-line operation capability should not be assumed without confirming pressure, DN, and load direction.
Is it suitable for continuous regulation?
Not as a primary use. Throttling requires checking Kv, differential pressure, velocity, and PTFE seat wear.
When is S66 PTFE chosen?
When a PTFE contact surface with the fluid is needed and common elastomer liners are not chemically acceptable.
Range: Size DN50 to DN600 - other upon request
End connection: Lug type
Flange connection: EN 1092 PN 10/16 - ASME Class 150
Temperature range: -40°C to +200 °C
Face to face: acc. EN 558 series 20/13 - ISO 5752 Series 20/13 - API 609 Cat. A - Design EN 593
Accessories & Compatibility
