Zwick – Tri-Con Triple Offset ValveEnquire Now

Engineer standing inside large 66 inch Zwick Tri-Con valve, highlighting scale and robust construction

Tri-Con (TOV) Bare Shaft

Zwick Tri-Con triple offset valve with pneumatic actuator and positioner for control and on/off service

Tri-Con (TOV) On/Off & Control

Zwick Tri-Con triple offset valve in manual configuration with gearbox for critical isolation duties

Tri-Con (TOV) Manual Operation

Comparison between DN200 PN25 Zwick Tri-Con triple offset valve and gate valve, showing reduced weight and face-to-face length

Gate Valve vs. Zwick Tri-Con

Zwick Tri-Con 78 inch valve with engineer standing in front, showcasing robust triple offset design for heavy-duty service

Tri-Con (TOV) DN2000 -78"

BRAND: ZwickCATEGORY: Control Valves, Triple Offset Valves,

ZERO Leakage. Lower Maintenance. Long-Term Reliability.

Engineered for absolute shut-off in the most demanding gas and liquid applications.

The Zwick Tri-Con triple offset valve is engineered for zero-leakage performance, even under extreme temperature variations and pressure peaks. With the widest laminated seal ring in the market, it provides unmatched durability and long-term sealing integrity, ensuring leak-free operation in critical gas and liquid services.

For technicians, engineers and production managers, this means:

Longer production runs, with fewer shutdowns
No costly or dangerous leaks, protecting the environment and process efficiency
Reduced seat wear, thanks to frictionless cone-in-cone sealing for smooth, low-torque operation
Lower installation costs—lighter weight and smaller installation envelope, reducing the need for large cranes, extended rigging crews, or costly modifications when replacing older gate valves

The frictionless triple offset seating design eliminates break-away torque, reducing actuator wear and enabling smooth operation—minimising maintenance and extending valve life.

With proven installations across synthetic fuels, oil & gas, chemical, and power generation industries in South Africa, the Tri-Con is available in double flanged, wafer, lug, butt weld and gate valve face-to-face configurations. It’s also ideal for oxygen service and steam-jacketed applications such as molten sulphur.

Our Valve Repair Centres in Secunda and Durban provide full valve reconditioning, automation, and testing services, keeping your Zwick Tri-Con in peak operating condition.

Reduce downtime. Lower Installation Costs. Eliminate leaks.

Download the Zwick Tri-Con Technical Bulletin

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Contact us Today – Tel: 0861 103 103

Valve Repair Services

Specifications

Series	Tri-Con - Triple Offset Valves
Design	Triple Offset / Triple Eccentric Rotary Valve
Features	ZERO-leakage bi-directional shut-off in gas and liquid applications No seat rubbing during operation – thanks to frictionless cone-in-cone design Reduced actuator size and wear from torque-seated disc with no break-away torque Lower downtime with resilient metal-to-metal seats for long-term durability Improved safety and compliance – SIL3 certified and anti-blow-out shaft Simplified installation due to short face-to-face dimensions Smaller footprint and weight compared to gate valves – reduces crane and rigging needs Temperature compensation built into design for shaft/seat alignment at extreme temperatures Suitable for oxygen service, steam jackets, and high-cycling control duty Supported bearing bushings for optimal shaft alignment and extended valve life
Size Range	DN 50 – 2200 / 2” – 88”
Pressure Rating	PN 10 – 160 / ANSI 150 – 1500
Temperatures	-215°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 Materials	Resilient metal to metal
Standards	Material and/or pressure test reports with cert. to EN 10204 / 3.1 Fire Safe acc. API 607 4th ed. and B.S. 6755 for both directions CE-Certificate acc. to 2014/68/EU Anti blow-out shaft API 609 Leakage testing to API 598 and/or DIN EN 12266-1 Fugitive emissions to TA-LUFT 1 & 2 / VDI 2440 BAM-Approval for Oxygen Mounting bracket acc. to ISO 5211
Options & Accessories	Manual, pneumatic actuators or electric actuators Valve Positioners Solid or laminated seal ring High cycle bearings Steam jackets Degreased for oxygen service Tri-Shark throttling trim cartridge
Applications	Where you are looking for an isolation, on/off or control valve that provides zero leakage, and has a proven track record with companies like Sasol, Sapref, Engen, Eskom, Sappi, Mondi and many others for applications like, Steam / gas / process / hydrocarbons Severe service SD & ESD Systems