Inlet Sizes : 1″ through 12″
Ratings : ANSI Class 600 to 2500
Materials : Carbon steel, Stainless steel
Actuators : Model 37/38 spring-opposed diaphragm; model 87/88 multi-spring-opposed diaphragm; cylinder
Trim : axial flow technology; multi-stage, cage-guided, anti-cavitation trim; Class VI available on request
Inherent Characteristics : Linear
Description : The 18400 and 78400 Series valve is used in high-pressure liquid service applications to help eliminate cavitation.
Source : http://www.geoilandgas.com/distributed-gas/production/severe-service-valves