ADJUSTABLE CHOKE VALVE

摘要

Disclosed is an adjustable choke valve having opposed abutting discs which have apertures passing therethrough for adjustably varying the flow of fluid through the valve as one disc is rotated with respect to the other. The opposed mating surfaces of the discs are covered with coatings of dense impermeable material having a hardness of at least 2,700 on the Knoop scale and are polished to provide an effective fluid seal therebetween. Also disclosed are methods for fabricating steel discs with titanium carbide coated graphite inserts in the opposed mating surfaces.