6" RIV Cast Iron Knife Gate Valve Unidirectional Double Acting Hydraulic Actuator AGRI Standard and ANSI 150. RIV134This 6" RIV Cast Iron Knife Gate Valve is designed with a unidirectional double acting hydraulic actuator, making it suitable for both AGRI Standard and ANSI 150 industrial applications. Crafted with durable cast iron, this valve offers reliable performance and efficient control. To suit ANSI 150 and AGRI Standard Square Flanges 4 Hole Cast Iron Body Stainless Steel Blade NBR Gaskets Fully Enclosed for Safety, with Position Indicator Double Acting