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Butterfly Valves

Used in industries such as - Water and Wastewater Treatment, and Chemical Processing, Pharmaceuticals and more

Rubber-lined concentric Butterfly valve:

  • Lightweight (wafer)
  • Media isolated from metal.
  • Tight shutoff

High-performance Butterfly valve:

  • High temperatures
  • Higher ratings than concentric rubber lined
  • Tight shutoff even on metal seated/ Graphite lamination on disk

Zwick Armaturen, a renowned German manufacturer, boasts more than four decades of expertise in producing triple offset butterfly valves known as Zwick butterfly valves. These exceptional valves are celebrated for their impeccable performance and a remarkable 100% zero-leakage capability. Zwick butterfly valves are characterised by their precision engineering, groundbreaking design, and robust build, making them the go-to choice for vital industrial applications. They not only enhance productivity but also elevate safety and operational efficiency.

The utility of these triple offset butterfly valves extends across multiple sectors, including oil and gas, petrochemicals, hydrogen, power generation, refining, and water treatment. These valves are predominantly deployed for the critical functions of isolation and control in pipelines that transport a wide array of substances, encompassing gases, liquids, and steam.

Pekos Valves

Size Range2” – 88”
Pressure ClassANSI 150#-1500#
MaterialsWCC / LCC / CF8M / Bronze AB2 / Duplex
ConstructionFlanged / Wafer / Wafer Lugg / Butt / Weld
DesignTrue cone-in-cone seating design for frictionless operation and low torques. Triple eccentric (offset) conical metal seats 100% Zero leakage. Sealed Bearing Options.
CertificationAPI 609, Firesafe Certified, SIL 3, NACE, PED CE/CA, ATEX, Ta Luft

What Is A Zwick Triple Offset Butterfly Valve?

Zwick butterfly valves, have widespread applications in global industrial processes demanding absolute, guaranteed sealing integrity.

These valves are meticulously engineered to deliver consistent and reliable sealing performance, particularly excelling under conditions of high pressure and elevated temperatures. Unlike conventional butterfly valves, which pivot around a centrally aligned axis, Zwick triple offset butterfly valves showcase a unique three-tiered design:

Shaft Offset: The valve’s pivotal shaft, on which the disc is mounted, is strategically positioned off-centre from the valve bore’s central axis. This deliberate offset introduces a cam-like motion during operation, mitigating friction between the disc and the seat. The outcome is a tight and unwavering seal, even under the most demanding high-pressure scenarios.

Laminated Seal Ring Offset: The laminated seal ring, serving as the key sealing interface, is precisely positioned in offset alignment with the valve’s shaft. This offset, combined with the cam-like disc motion, represents the second offset. Zwick’s laminated seal ring stands out with its generous surface area, thanks to its unique angle. This configuration ensures superior sealing reliability compared to other brands with less seal-to-seat contact area.

Conical Seat: The seat, which comes into contact with the seal ring, features a conical and tapered design. The apex of the “cone” aligns in parallel with the valve body on one side, forming the third offset. Zwick’s distinct seat angle, set at 25 degrees, ensures frictionless sealing durability. Notably, there’s no contact between the disc seal and the seat until the moment of closure. This effectively eliminates any wedging of the seal into the seat, reducing wear and minimising torque.

The amalgamation of these three offsets within the triple offset butterfly valve imparts numerous advantages over conventional butterfly valves, such as:

Enhanced Sealing Performance: Zwick’s triple offset design drastically curtails leakage, even in the most challenging high-pressure and high-temperature operational environments. This attribute makes it a top choice for critical processes necessitating impeccable shut-off.

Prolonged Service Life and Minimal Wear: The cam-like motion and friction-reducing mechanisms between sealing components translate to reduced wear and tear, thereby extending the valve’s operational longevity and diminishing maintenance needs.

Reduced Torque Demands: The triple offset valve’s design streamlines the torque required for valve actuation. This feature facilitates the use of smaller and more cost-effective actuators compared to other valve types.

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