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Shearseal Knifegate Valve

Shearseal Knifegate Valve
Shearseal Knifegate Valve
Shearseal Knifegate Valve
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Shearseal Knifegate Valve

Shearseal Design
Most knife gate valve manufacturers describe their valve as rugged and dependable. In the Shearseal Valve, these qualities are not idle claims. The product has been designed and built in Australia without any cost cutting measures adopted by many mass producers
Compare a Shearseal Knife Gate Valve with any of its competitors. The Shearseal valve is stronger. The additional strength comes from built in reserves where it is most need in full bodied castings, reinforced gland and stuffing box sections extra thickness in the stainless steel gate, heavy duty stainless stem, and bronze drive nut, large diameter hand wheel and ball thrust races in all sizes. Four gland bolts – not two. O-ring sealing standard at no extra cost.
Every component used in the construction of a Shearseal Knife Gate Valve is built to last, as you would expect in any valve having easily replaceable seat rubber for maximum service life. Seat pressure rating 1034 kpa (689 kpa for valves 200mm and bigger up to 750mm)
The superior design and construction of valves follows three decades of development of the o-ring seating principle. Rubber seated knife gates are used around the world in traditional knife gate valve markets, with an increasing number of new users, who have found in this design all the advantages of pocket less knife gate construction without compromising fluid tightness, directionality, bore dimensions and finish.
All valves can be flange drilled either to wafer or lugged/tapped to any specification required for the job such as Table C, D, E, F and H, ANSI 150 and 300, DIN 10, PN10 and 16 as well as S.A.B.S 1123 to name a few. If you require anything else or require special needs it can be accommodated.

Shearseal Series 1 Features

  • Bi directional drop tight sealing at 1034 kpa(689 kpa for sizes 200mm and over)
  • Minimal pressure drop and flow restrictions – resilient seat is fitted into body recess clear of line of flow for extended seat life.
  • Improved gland and stuffing box design. Tapered seating faces direct packing towards gate surfaces, reducing gland compression required for gland sealing.
  • Non rising stem for reduced valve height in open position ideal in confined spaces safer for operators.
  • Split body design – can be easily dismantled for seat replacement.
  • Provision for optional blade scrapers to clean gate faces below packing gland. Helps prevent gland fouling and wear in sticky or highly abrasive line service.
  • Ball thrust faces supplied on all sizes. Single start stem thread for minimum rim pull in valve operation
  • Hexagonal mounting pillars for sizes Ø300mm and smaller with steel channel for sizes Ø300mm and above provide a solid foundation for all actuators including pneumatic, hydraulic, electric and lever operators.
  • Maximum bore clearance. No seat ring projection, gate guides or jams to obstruct flow and cause build up of solids.


Shearseal Fig 20 Polyurethane liner valve

  • Moulded polyurethane bore liner acts as a deflection cone to give extended service life over the standard knife gate valves especially designed for highly abrasive application such as fly ash, mining operations and coal washeries.
  • Bi directional drop tight sealing at 1034 kpa(689 kpa for sizes 200mm and over)
  • Minimal pressure drop and flow restrictions – resilient seat is fitted into body recess clear of line of flow for extended seat life.
  • Improved gland and stuffing box design. Tapered seating faces direct packing towards gate surfaces, reducing gland compression required for gland sealing.
  • Non rising stem for reduced valve height in open position ideal in confined spaces safer for operators.
  • Split body design – can be easily dismantled for seat replacement.
  • Provision for optional blade scrapers to clean gate faces below packing gland. Helps prevent gland fouling and wear in sticky or highly abrasive line service.
  • Ball thrust faces supplied on all sizes. Single start stem thread for minimum rim pull in valve operation
  • Hexagonal mounting pillars for sizes Ø300mm and smaller with steel channel for sizes Ø300mm and above provide a solid foundation for all actuators including pneumatic, hydraulic, electric and lever operators.
  • Maximum bore clearance. No seat ring projection, gate guides or jams to obstruct flow and cause build up of solids


Shearseal Fig 30 Polyurethane lined valve

  • Moulded polyurethane liner that covers the bore, chest and packing gland areas to give maximum protection to give extended service life over standard and Figure 20 knife gate valves especially designed for highly abrasive, highly salty slurry and some chemical areas.
  • Bi directional drop tight sealing at 1034 kpa(689 kpa for sizes 200mm and over)
  • Minimal pressure drop and flow restrictions – resilient seat is fitted into body recess clear of line of flow for extended seat life.
  • Packing gland is a fabricated 316 Stainless Steel design.
  • Non rising stem for reduced valve height in open position ideal in confined spaces safer for operators.
  • Split body design – can be easily dismantled.
  • Ball thrust faces supplied on all sizes. Single start stem thread for minimum rim pull in valve operation
  • Hexagonal mounting pillars for sizes Ø300mm and smaller with steel channel for sizes Ø300mm and above provide a solid foundation for all actuators including pneumatic, hydraulic, electric and lever operators.
  • Maximum bore clearance. No seat ring projection, gate guides or jams to obstruct flow and cause build up of solids


Deflection Cones
Deflection cones are manufactured from abrasion resistant Ni-hard or polyurethane and are available for use on abrasive slurries or dry products.  Deflection cones protect the valve seat and reduce the attrition of the body behind the seat area.
Ni Hard deflection cones range in size from Ø50mm to Ø300mm
Polyurethane deflection cones range in size from Ø50mm to Ø750mm