Knife Gate Valve - RC - ROUND SQUARE | Zubi | Philippopoulos s.a.
Knife Gate Valve - RC - ROUND SQUARE | Zubi | Philippopoulos s.a.

Knife Gate Valve - RC - ROUND SQUARE | Zubi

Zubi RC Round / Square Knife Gate Valve

The Zubi RC Round/Square is a wafer-type knife gate valve designed for challenging discharge, recycling, pulp, and bulk solids applications. Its geometry features a circular inlet and a larger square outlet to minimize material jamming during the passage of solids or fibers.

Construction and Operation

The body is cast, split, two-piece, with internal machining and reinforcement ribs for larger diameters. Replaceable internal guides support the knife movement, while the oversized knife is polished on both sides to reduce friction on guides, seat, and packing.

Applications

Typical installation locations:

  • sand traps and rubbish traps in pulpers,
  • high consistency cleaners,
  • silo outlets with solid materials,
  • recycling, pulp, mining, and bulk handling,
  • water/wastewater, chemical industry, food, and power plants.

Pressure, Connections, and Sealing

  • DN50–DN250: 10 bar
  • DN300–DN450: 6 bar
  • DN500–DN600: 4 bar
  • Higher pressures: upon application review
  • Flanges: PN6/10/16/25/40, ANSI 125/150, BST D/E, JIS 5K/10K, AS-2129 D/E
  • Sealing: metal/metal, PTFE, or watertight execution

Materials and Seat Selection

Body: GG25, GGG40, A216 WCB, CF8, CF8M, CF3M, 254SMO, 654SMO, AISI310, 904L, Duplex SAF2205, Superduplex SAF2507.
Seats: EPDM, NBR, Silicone, Viton, Graphite, Flucast, or PTFE.
Packing: Synt+PTFE, pure PTFE, graphite, ceramic, or greased cotton. Selection based on temperature, pH, abrasiveness, and leakage requirements.

Actuation

Available with handwheel, lever, gearbox, chain wheel, pneumatic, hydraulic, or electric actuator. Optional: limit switches, proximity sensors, solenoid valves, positioner 4–20 mA, locking devices, cleaning holes, bonnet, and regulation V-ports.

FAQ

When is it chosen over a circular knife gate?
When the line connects a circular inlet to a square discharge or when the material tends to bridge/jam.

Is it a control valve?
Primarily used as on/off isolation or discharge. For throttling, flow rate control, seat wear, and potential use of V-port must be considered.

Description

Main Features

  • The two piece body with round inlet and square outlet (larger than the inlet) assures non-jamming.
  • Cast two-part bolted body, internally machined and with reinforcing ribs in larger diameters for extra body strength.
  • The internal replaceable gate guides allow for smoother gate traveling.
  • Oversized knife polished on both sides.
  • Long-life packing with several impregnated Synt+PTFE strips.
  • Suitable to work with the most severe applications.

DIRECTIVAS

  • DIR 2006/42/CE (machinery)
  • DIR 2014/68/EU (PED) Fluid Group 1(b), 2 (Cat. I. mod. A)
  • DIR 2014/34/EU (ATEX) Area 2&22

Technical Data

FLANGE CONNECTION

  • PN6/PN10/PN16/PN25/PN40
  • ANSI125/150
  • BST E / BST D
  • JIS 5K JIS10K
  • AS-2129-D/E

SIZES & PRESSURES

  • DN50 to DN250: 10 bar
  • DN300 to DN450: 6 bar
  • DN500 to DN600: 4 bar

(Higher design pressures on request)

TIGHTNESS

  • Metal/Metal
  • PTFE
  • Watertight

MATERIALS

BODY  GG25, GGG40, A216 WCB, CF8 (AISI304), CF8M (AISI316), CF3M (AISI316L), 254SMO, 654SMO, AISI310, AISI904, DUPLEX SAF2205, SUPERDUPLEX SAF2507, AISI316Ti.

SEAT EPDM, NITRILE (NBR), SILICONE, VITON, GRAPHITE, FLUCAST, PTFE.

GATE AISI304L, AISI316L, 254SMO, HARDOX, AISI310, AISI904L, DUPLEX SAF2205, SUPERDUPLEX SAF2507, AISI316Ti.

PACKING SYNT+PTFE, Pure PTFE, GRAPHITE, CERAMIC, Greased COTTON.

ACTUATORS

Manual, pneumatic, hydraulic, electric, gear box, hand lever, square end, chain-wheel, pneumatic with security hand wheel, pneumatic with security gear box.

ACCESSORIES AND OPTIONS

Limit switches, proximity sensors, solenoid valves, positioner 4/20mA, sleeves, locking devices, extension, regulation v-ports, cleaning holes, bonnet, etc.