High-stability valve arrangement for a governor valve

摘要

A valve arrangement ( 10 ) for reducing the instability of fluid flow in a compressible flow governor valve includes a cutoff plug ( 12 ) with a lateral concave surface ( 14 ) and an end portion ( 16 ) having a substantially circular cross section, and a seat ( 30 ) with a convex surface ( 32 ). The lateral concave surface ( 14 ) and the end portion ( 16 ) of the cutoff plug ( 12 ) define an abrupt cutoff corner ( 18 ). The radius (re) of the end portion ( 16 ) of the cutoff plug ( 12 ) is less than the radius (Rs) of the seat ( 30 ). The radius of curvature (R) of the seat ( 30 ) is less than the radius of curvature (rq) of the lateral concave surface ( 14 ) of the cutoff plug ( 12 ). The configuration of the cutoff plug ( 12 ) and seat ( 30 ) enhances the annular flow pattern beneath the cutoff plug ( 12 ) at all lift positions thus reducing flow instability.