Inlet Sizes : 2” x 3” through 8” x 10″
Ratings : ANSI Class 900 to 2500
Materials : Carbon steel; Stainless steel; Chrome-moly
Actuators : Model 37/38 spring-opposed diaphragm; cylinder
Trim : Axial flow technology; multi-stage trim (expanding area type); anti-cavitation, flashing, de-gassing, and low noise
Inherent Characteristics : Linear
Description : The 77000 Series multi-stage, expanding-area control valve is primarily for high-pressure compressible fluid or two-phase flow applications.
Source : http://www.geoilandgas.com/distributed-gas/production/severe-service-valves