WCV choke valves are supplied in two types: Positive and Adjustable. ●Designed as per API 6A, API 16C, NACE MR0175 ●Structure Type: needle, barrel, cage, orifice and wedge ●Working Pressure: 3,000 psi, 5,000 psi, 10,000 psi, 15,000 psi ●Nominal Bore: 2-1/16”, 2-9/16”, 3-1/16”, 3-1/8”, 4-1/16” POSITIVE CHOKE Positive chokes allow external adjustment in orifice size 5/64” through 48/64” in 1/64” increments. ADJUSTABLE CHOKE Adjustable chokes Indicator sleeve reveals orifice size in 1/64” increments needed for conversion to an equivalent positive choke size.