Butterfly Valves

ZWICK TRI-CON Triple Offset, Metal Seated, Butterfly Valves

tri-con-size11 butterfly valve


The number of unique technical attributes of the product, as the cone-in-cone seating design with the multiple laminations and the metal seat makes the series TRI-CON to an allrounder for many different industrial applications.

Zwick valves are used for industrial and exhaust gases, liquids, hot water or steam at lowest as well at high temperature zones up to 815°C. The TRI-CON is utilized extensively in the chemical, petro-chemical, oil & gas, offshore and district heating markets.


ZWICK loves big challenges. And big means big. Valves can be manufactured in maximum dimensions of over 200 cm in diameter.


The series TRI-CON contains nominal sizes from 2” to 88”and pressure classes from ANSI 150 lbs to 1500 lbs.

The complete range of standard body styles like lug type,double flange, and gate valves face to face dimensions are available in various raw materials.

Triple Offset Metal-Seated State-of-the-Art

The triple offset geometry and the special features guarantee 100% zero-leakage performance even during extreme temperature variation and pressure peaks.

TRI-CON valves offer the widest laminated seal ring in the market today, made possible by true cone-in-cone seating design which assures a frictionless opening and closing with lowest torques and without break-away torque. Zwick’s design provides 100% tightness in gas services.

Zwick valves are used for critical services in many global industries for liquids and gases. The triple offset valves are designed for temperatures up to 815°C and for cryogenic services.


The construction guarantees the optimal position of the laminated seal against the seat. Jamming due to thermal expansion is eliminated.


The disc is keyed to the shaft not pinned, providing balanced torque transmission and eliminating the danger of pins shearing off.


The strong disc with its eliptical supporting surface offers the best fixing of the lamination. Bubble tightness is given as a result of the special machining of the lamination.


The optimal position of the bearing reduces the risk of the shaft bending. This guarantees bi-directional tightness at maximum differental pressure.



  • Triple eccentric design
  • Metal seating
  • Pressure classes according ANSI 150/300/600/900 and PN 10/16/25/40/63/100/160
  • Full bi-directional shutoff as per API 598 and/or DIN EN 12266-1
  • Temperature range up to 815°C
  • Size range 2″ – 88″ (DN 50-2200)
  • Friction free opening and closing
  • Vacuum tight
  • Laminated seal and seat made of stainless steel
  • Anti blow-out shaft API 609
  • Steel casting, stainless steel, special alloys
  • Fire-safe acc. to BS 6755 and API 607 4th ed. for both flow directions
  • Fugitive emission control acc. to “TA-Luft II”
  • Optional Double Block & Bleed Design
  • Special customer requirements on request
  • SIL 3
  • EPA 21

ECONTROL Butterfly Valves

ECONTROL Butterfly Valve

ECONTROL VM-100 (concentric) is the most competitive range of Butterfly Valves for all standard services wth the highest quality standards keeping the most competitive costing.

ECONTROL VM-200 (double or triple eccentric) is a highly appreciated range of High Performance Butterfly Valves for all critical services and high-pressure services (up to rating ANSI 900#) with great availability of special materials and configurations.

ECONTROL VM-300 (double or triple eccentric)is our range of large, over-sized (up to DN 200″) and made-to-measure designed butterfly valves and dampers.


All VM-100, VM-200 and VM-300 valves are available in manual or actuated version (pneumatic, electric, hydraulic, electro-hydraulic, pneumo-hydraulic…) and are compliant to the main European Union and international industry standards including fire-safety, immersion testing, gas testing, cryogenic testing, helium leakage testing, etc…

ECONTROL has furthermore applied all the expertise of the Valve Engineering Unit (V.E.U.) in enforcing the butterfly valve range as one of its strongest flow control solution and a wide range of materials is available from ductile iron to highest grade and exotic super duplex stainless steels, monel, inconel, titanium that are proven and certified for all kinds of industry from potable water transmission to highly corrossive mining applications.

VM-100, VM-200 and VM-300 butterfly valves family provide an integral flow control solution for customers from small diameters to large 200″ valves with all types of operation and actuation possibilities and engineered, designed, built, tested and guaranteed by ECONTROL professionals.

Manufactured sizesDN 25 thru DN 6000 / NPS 1″ thru NPS 240″. Higher or special sizes may be developed upon request, please enquiry
Pressure ratingsPN2, PN6, PN10, PN40, PN100 / ANSI 150#, ANSI 300#, ANSI 600#. ANSI 900#. Please enquiry for higher or lower ratings
Valve connectionsASME B16.5 (FF, RF, RTJ), ASME B16.47 Series A or B, MSS SP-44, Wafer, Lugged. Please enquiry for special connections
StandardizationAPI 609, ASME B16.34, API 607, BS 6755 Part 2, ASME B16.10, API 598, NACE 01-MR-0175. Please enquiry for other standards
BodyASTM A216, A126, GGG-40, A350, A182, A351, A352, A890, A995, C95300, C95800, MONEL, INCONEL. Please enquiry for different material configurations
TrimASTM A216, A126, GGG-40, A350, A182, A351, A352, A890, A995, C95300, C95800, MONEL, INCONEL. Please enquiry for different material configurations
Seat(s)PTFE, NYLON, PEEK, NBR, KELF, ENP (Electroless nickel plating), HC (Hard chrome), TC (Tungsted carbide). Please enquiry for different material configurations
SealingBUNA-N, EPDM, VITON, Flexible graphite, FKM, Nitrile, Neoprene. Please enquiry for different material configurations



  • storage tanks
  • on- and offshore
  • LNG and LPG
  • ethylene extraction
  • desulphurization
  • FSPO
  • ESD-HIPPS-valves


  • steam
  • hot water
  • condensate
  • power plant (nuclear, coal, gas, steam, biomass)
  • solar heat (thermal oil, molten salt)
  • geothermal energy
  • shale gas
  • water- and pump-storage / hydro power plant
  • waste incineration and processing plant district heat


  • steam
  • hot water
  • condensate


  • power plants
  • process media (critical applications such as butadiene, styrene, ethylene, propylene, etc.)
  • process cooling (cold box)
  • supply and storage


  • exhaust gases
  • coke oven
  • steam, water
  • oxygen
  • energy recovery
  • blast furnace


  • steam
  • hot water
  • condensate


  • technical gases (e.g. oxygen, nitrogen) flammable gases (e.g. natural gas)
  • carbon capture & storage
  • mole sieve switching valves dehydration
  • gas to liquids processing


  • water
  • corrosive cases