Bi Directional Knife Edge Gate Valve
Specification & Standard
Size Range
50MM To 300MM
Temperature Range
Upto 200°C
Pressure Class
Min.5 Bar-max.10 Bar
Design & Manufacturer
MSS SP - 81
Valve Face To Face Dimension
MSS SP - 81
Inspection & Testing
MSS SP - 81
Body Material
C.I / S.G.I / D.I / WCB
Disc Material
SS 304 / SS 316 / SS 316L / SS 310 / DUPLEX 2205
Seat Material
NBR / EPDM / VITON / PTFE
Body Style
Single Pc, Semi Lug and Wafer Type
Flange Drilling
ANSI B 16.5 (150#) EN 1092 - 2 PN 10
Leakage Class
Class - VI
Media
Mining & Mineral Processing, Pulp & Paper, Cement, Water, Sugar, Carbon Black, Material Handling, Fossil Fuel Power
Features & Benefits
1 – STEM : The standard stainless steel stem offers a long corrosion resistant life. For rising stem handwheel actuators only, a stem protector is provided for additional protection against dust while the valve is in the open position.
2 – GATE : Standard AISI 304 stainless steel gate. The gate is polished on both sides for a greater seal between the gate with both packing and seat. The gate is fully guided in the body allowing for bi-directional service. The material of the gate can be changed on request for higher pressure requirements.
3 – PACKING : Standard PTFE impregnated synthetic fiber (st) with EPDM O-ring for better shut off, with an easy access packing gland ensuring a tight seal. Long-life braided packing is available in a wide range of materials.
4 – SEAT : (RESILIENT) : Completely new design sleeve, slotted in the top half to allow the gate travel. guaranteeing full fitness with low friction. The sleeve is held by means of two seat rings which support it and also guide the gate. The resilient seat is an elastomer sleeve, also available in different materials.
5 – YOKE OR ACTUATOR SUPPORT : Made of EPOXY coated steel (stainless steel available on request). Compact design makes it extremely robust even under the most severe conditions.
6 – BODY : Wafer-style cast monoblock faces and reinforcing ribs in large diameters for extra body strength. Full part design for greater flow capacity and minimal pressure drop. The internal body design avoids any accumulation of solids that would prevent the valve from closing.Flush ports may be added to allow for the cleaning of solids trapped within the body cavities that can obstruct the flow or prevent the valve from closing (purging can be made with air, steam, liquids, etc)These bi-directional knife gate valves are not suitable for dead-end service without a slight modification or acounter flange. please contact the Technical Department at aira.
7 – EPOXY COATING : The epoxy coating on all “aira” cast iron & carbon steel valve bodies and components is applied by means of an electrostatic process, making the valves corrosion-resistant with a high quality finished surface. The “aira” standard color is RAL-5015 blue.
