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6 Cards in this Set
- Front
- Back
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Frictionless Guided valve parts
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Seat
Valve guard Valve plate Lift washer Lift washer Damper plate Closing springs Damping springs Nut |
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Frictionless Guided Plates
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Valve Plate
Damper Plate |
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Princilpe of Duble Damping – Princípio do amortecimento duplo
Advantages |
Advantage 1: Increase in spring force
Advantage 2: Reduction of Tumbling - Movimento de rotação Advantage 3: Reduction of opening impact. |
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Effect of Duble Damping – efeito do amoretecimento duplo
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Reduction of opening impact
Strong damping springs against sticktion on the guard Reduction of closing impact velocity Reduction of tumbling motion of valve plate |
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Impulse Law – Aplicação da lei do impulso ao principio de amortecimento em válvulas
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Damper plates mass: Mdp
Valve plate mass: Mvp Valve plate velocity: Vb Plate pack velocity: Pa Va = Vb * Mvp / ( Mvp + Mdp ) |
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Tumbling mtion– Movimento de rotação
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The valve plate normally impacts with at an angle onto the seat.
With the first impact the velocity of the centre of gravity is reduced, the plate starts to rotate with angular velocity w The 2nd impact is harder than the first Impact velocity: V2 = Vt + w*r |
