Knife Gate Valve - SQUARE MODEL VALVE | Zubi

Knife Gate Valve Zubi Square Model

The Zubi Square Model is a square-section knife gate valve designed for low-pressure applications involving solid loads. It is primarily used at silo outlets, hoppers, and bulk handling lines where the flow involves powders, granules, or solid materials, rather than clean liquid pressure networks. The body is a single-piece welded body, featuring a polished stainless steel knife and rounded edges to minimize wear on the seat and packing.

Operating Range

• Dimensions: 150×150 to 1200×1200 mm
• Design Pressure: 1 bar
• Higher pressures: subject to technical review
• Flange connection: per Zubi standard or according to installation dimensions
• Sealing: metal/metal, PTFE, or watertight execution

Installation Orientation

The valve is unidirectional. The highest pressure should be applied towards the seat, regardless of the nominal flow direction. When used under silos or hoppers, where pressure is low and material falls by gravity, installation is typically reversed for better discharge and reduced material retention in the body.

Materials and Sealing

Body: carbon steel, AISI304L, AISI316L, 254SMO, 654SMO, AISI310, 904L, Duplex SAF2205, Superduplex SAF2507, AISI316Ti.
Seat: EPDM, NBR, Silicone, Viton, Graphite, Flucast, or PTFE.
Knife: AISI304L, AISI316L, Hardox, 904L, Duplex, or Superduplex.
Packing: Synt+PTFE, pure PTFE, Graphite, Ceramic, or greased cotton.

Actuation and Options

Available with gearbox, gearbox with chain-wheel, electric or hydraulic actuator. Optional: limit switches, proximity sensors, locking devices, stem extension, regulation V-ports, and cleaning holes. In pneumatic systems, air must be filtered/lubricated and operate around 5–6 bar.

Standards / Guidelines

Compliance with 2006/42/CE Machinery, 2014/68/EU PED, and suitability for ATEX Area 2 & 22.