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Zwick - Tri-Con Triple Offset / Triple Eccentric Valves

The Zwick Tri-Con triple offset valve is a metal seated valve with the widest laminated seal ring in the market today. These triple offset valves are also known as triple eccentric valves or triple offset butterfly valves. The most popular configuration is double flanged even though wafer, lug and but weld are also readily available. The unique design offers zero leakage which is made possible by true cone-in-cone seating design which ensures frictionless opening and closing with lowest torques and without a break-away torque. The robust design makes the Tri-Con triple offset valve the ideal rotary solution for isolation, on/off and control in today’s demanding process industry. Zwick’s proven design provides 100% tightness in gas services enabling it to be used for critical liquid and gas services. Full repair and reconditioning facilities are available at our Vereeniging and Durban branches. There are hundreds of valves installed in South Africa today in industries like synthetic fuels, oil & gas, chemical and power generation.  Contact one of our technical specialists for a quote today or download the brochure to learn more!

Tri-Con - Triple Offset Valves
Triple Offset / Triple Eccentric Rotary Valve          butterfly valves
  • SIL3 Certified
  • ZERO leakage bi-directional shut-off
  • Resilient metal to metal seats
  • Quarter turn friction free operation - No seat rubbing
  • Self-centering torque seated disc - True cone in cone sealing
  • Temperature compensating - No shaft to disc pins
  • Supported bearing bushing for optimal shaft support
  • Fire test to API 607 4th edition and BS 6755 both directions
  • Anti blow-out shaft API 609
  • Leakage testing to API 598 / API 607 / DIN EN 12266
  • Fugitive emissions to TA-LUFT II
Size Range
50mm to 2200mm / 2” to 88”
Pressure Rating
PN16 - 100 / ANSI 150 - 900
-196°C to +815°C
End Connections
Double flanged / Lug / Wafer / Buttweld / Gate valve face to face
Body Materials
Carbon steel / Stainless Steel / Alloy steels / Special alloys
Disc Materials
Carbon steel / Stainless Steel / Alloy steels
Seat MaterialsResilient metal to metal
Options & accessories