DSV 1 and DSV 2 change-over valves, designed to meet all industrial refrigeration application requirements. DSV valves are designed specifically for use with double safety valve systems. The valves are designed to give favourable flow characteristics and are easy to dismantle for servicing. The valve cone is designed to ensure perfect closing, and even with minimum torque the valve closes effectively. All valves are equipped with vented cap and nipple/flange connections, for easy inspection or replacement of safety relief valves. Are supplied complete with DSV inlet connection fittings, DSV outlet connection fittings, and SFV outlet connection fittings. Refrigerants: Applicable to HCFC, non flammable HFC, R717 (Ammonia) and R744 (CO2). Flammable hydrocarbons are not recommended. The valve is only recommended for use in closed circuits. Temperature range: -50 - +100°C (-58 - +212°F). Max. operating pressure: 40 bar g (580 psi g). Fluid Group 1. Category: see code no.