ash valveUnlike most knifegate valves our bonneted ash valve has a round gland sealing area, this will stop gland leakage experienced with conventional knifegate valves.

The gate is fully guided and pressed firmly on to the seat by the gate jams located on the center line of the bore, these jams are located outside of the flow path.

The large bonnet area allows process fluid to flow out freely not allowing build up or to jam the gate.

Unlike conventional knifegate valves, Normal flow is from the seat side of the valve so when the valve is closed there is no pressure on the gland packing or build up in the chest / bonnet area.

Unfortunately to allow this design work properly the face to face of the valve cannot comply with MSS-SP81.

Amv ash valves were first developed to handle ash discharge from a boiler on board a bulk handling ship. The requirements were:

  • Bi-directional shut off
  • No gland leakage
  • No clogging or jamming

The ash valve has been used in many applications including under hoppers, pump suction and discharge isolation.

The option list has grown to include but not limited too the following.

Body materials

  • Mild steel
  • Stainless steel
  • Duplex stainless steel

Gate materials

  • Mild steel
  • Stainless steel
  • Duplex stainless steel
  • Tool steel
  • Bisalloy
  • Thicker for higher pressure

Seat and Inlet Bore

  • Mild Steel
  • Stainless Steel
  • Duplex Stainless Steel
  • Tool Steel
  • Bisalloy
  • Ceramic Lined
  • Basalt Lined
  • Polyurethane
  • Rubber


  • Drilled To Suit Standard Or Non Standard Patterns
  • Drilled To Match Lined Pipe I.E. 250 Bore With 300 Drilling
  • Drilled To Suit Odd Flanges; Small Inlet / Large Outlet
  • Square To Suit Hoppers


  • Handwheel
  • Pneumatic Cylinder
  • Hydraulic Cylinder
  • Electric Actuator

Typical Uses Are

  • Wet And Dry Ash
  • Pre Mix Concrete
  • Mine Tails
  • Pallets
  • Sewage