Orbinox Uni-Directional Heavy Duty Knife Gate Valve (EW Series)

The Orbinox Uni-Directional Heavy Duty Knife Gate Valve, EW range is a heavy-duty, Uni-Directional, fully lugged, fully ported, non-clog knife gate valve, with Non-Rising Stem and designed according to AWWA C520-14. Typically used for isolation duties in municipal sewage and general industrial service applications, the knife gate valve can be supplied with a Metal/Metal seat or a unique, replaceable, resilient seat design with a reinforced, Stainless Steel retainer ring that mechanically locks the seal into the body. Various material options and seat arrangement designs can be selected including material deflection cones, high performance rings and for high temperature and high-density media applications. All ensure secure Uni-Directional shut-off and the internal design of the body ensures a non-clog performance with a media of suspended solids, including Pulp & Paper, Food & Beverage, Raw Sewage, Sludges and Slurries. Supplied with an AISI 430 Stainless Steel, Rising Stem as standard and a compact and extremely robust, Carbon Steel Yoke with AISI 304 Stainless Steel option, it can be supplied with DIN (EN 1092-2) PN10, PN16 or ANSI 150 flange connections, in sizes from DN50 up to DN900. Larger sizes are available as are alternative flange connections and a Rising Stem option. Available in Ductile Iron as standard, the Uni-Directional Heavy Duty Knife Gate Valve EW model 'monoblock' cast body, reinforced with ribs in larger diameters, includes internal cast-in guides and gate wedges allowing for a tighter gate/seat shut-off. This results in a fully guided gate and assured Uni-Directional shut-off, minimising the chance of gate seizure due to a build-up of solids over time. For finer solid applications, flushing ports can be added and depending on the process, purging can be achieved using steam, air or other liquids. All sizes of bodies are full ported for maximum flow capacity and minimal head loss. 60° or pentagonal V-Port design options, dependent on the type of fluid control required are also available on request The Stem is Stainless Steel whilst the gate, in AISI 304 as standard, is polished on both sides, lapped and supplied with a bevelled edge, specifically to cut through solids. This avoids seat damage, jamming of the gate and optimises the seal between the gate, seat and packing. The packing, as standard, is PTFE impregnated synthetic fibre with an EPDM O-ring for long-life performance and is easily adjustable with an accessible Gland Follower. A bonnet with atmospheric sealing and Stem packing options for greater packing protection is available along with other Stem, Gate & Packing Materials so please contact the Office to discuss your particular application for design optimisation.

Orbinox Uni-Directional Heavy Duty Knife Gate Valve Features

  • Uni-Directional Heavy Duty Knife Gate Valve
  • Sizes DN50 up to DN900
  • Up to 10 Bar Maximum Working Pressure (13 Bar on request)
  • Standard Flange Connection DIN (EN1092-2) PN10/16 & ANSI150
  • Designed to AWWAC520-14
  • A range of operators and Rising Stem available
  • Ductile Iron Body as standard
  • Polished Gate with Bevelled edge in 304 Stainless Steel with 316 & Duplex options
  • Metal to Metal or Multile Resilient Seat options
  • A wide range of long life packing materials
  • Protective Bonnet, V-Port & Flush Ports options available
Technical data



Bevel Gear & Hand Wheel (Non-Rising Stem), Bevel Gear & Hand Wheel (Rising Stem), Chain Wheel (Non-Rising Stem), Chain Wheel (Rising Stem), Double Acting (Non-Rising Stem), Electric Actuator – ISO Top (Non-Rising Stem), Electric Actuator – ISO Top (Rising Stem), Hand Wheel (Non-Rising Stem), Hand Wheel (Rising Stem), Hydraulic Actuator (Non-Rising Stem), Lever (Rising Stem), Single Acting Air to Close Pneumatic Actuator (Non-Rising Stem), Single Acting Air to Open Pneumatic Actuator (Non-Rising Stem), Square Nut/Cap Top (Non-Rising Stem)

Seal Material

EPDM, Metal to Metal, Other materials available on request


DN50 up to DN900

Download data sheet

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