Theory of Machine
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

80°- 90°
60°-70°
70°- 80°
50°- 60°

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Theory of Machine
The contact ratio is given by

(Length of the arc of contact)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)
(Length of the arc of approach)/cosφ

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