For most process, Water Treatment, Power
Generation and HVAC duties
Eliminates spindle leakage by (patented) design
Eliminates leakage between disc and seat
| Typical butterfly |
Tomoe performance butterfly |
| As disc approaches 90° the gap between disc and seat narrows |
Waveform seat creates uniform gap right up to moment of closure (at 82°) |
| Fluid velocity increases |
Fluid velocity increases uniformly |
| Erosion takes place |
Negligible erosion takes place |
| Leak path is created |
No leak path is created |
| Disc does not close - even at 90° |
Seat/disc life is extended by over 300% |
Dramatically reduces torque and wear
| Typical butterfly |
Tomoe performance butterfly |
| Closure is dependent on interface fit between disc and seat |
Closure is achieved on tangential contact between disc and seat |
| As disc approaches 90° torque and wear increase |
Torque remains constant as disc approaches initial close position |
| Closure is only obtained at 90° regardless of line pressure |
Full closure is offered from 90° dependent on line pressure |
| Maximum torque must be exerted to guarantee closure and facilitate opening - regardless of line pressure |
Maximum torque is only exerted to obtain closure at maximum line pressure |
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