IFC Butterfly Valves Pressure Assisted Seat Sealing System Advantages

Seat is non-compressed as disc approaches. Disc is closed with no line pressure. Disc in closed position; Line pressure applied from left side. Disc in closed position; Line pressure applied from right side. As the seat cross section is bellow shaped,line pressure exerts an upwards force on the seat independent of which side of the seat is under high pressure. This action forces the seat against the disc. Increased line pressure causes tighter sealing, thus ensuring bubble tight sealing at all differential pressures.

IFC Butterfly Valves Sealing System Advantages

• The IFC Series BH150W/L Butterfly Valve incorporates an innovative seat design that ensures bi-directional bubble tight seating at all differential pressures. Advantages of the IFC sealing system include:
• As system differential pressure increases the seat-disc interface proportionally tightens to maintain an effective seal.
• The IFC Butterfly Valves seat assembly is locked and slightly compressed in the body recess by a full-faced seat retainer, thus ensuring the seat is secure regardless of the disc position.
• The IFC Butterfly Valves seat is self adjusting to temperature changes and wear.
• The full face seat retainer is held in place by a circumferential snap spring constructed from Inconel. Unlike competitive designs that use bolts to retain the seat and seat retainer, the IFC design results in “ZERO” interruption across the full gasket seating surface.
• Since no special tools are required for the removal of the seat retainer, seat replacement is extremely easy. Remove the seat retainer by rotating it counter-clockwise, rotate the disc into the closed position and place a new seat into the seat chamber machined into the valve body.

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