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Part of the seat design involves the form on the valve. A 30-degree back cut, such as the one between the 45-degree seat and the back face of the valve, is essential to strong low-lift flow.
Valve Seat Power

 Part of the seat design involves the form on the valve. A 30-degree back cut, such as the one between the 45-degree seat and the back face of the valve, is essential to strong low-lift flow.  View Related Article

 

 

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