The V46 Pressure-Actuated Modulating Valves Come In Two Types Of Control Action: Direct Acting Or Reverse Acting. Direct-Acting V46 Valves Are Typically Used For Regulating Refrigerant Head Pressure In Water-Cooled Condensers. Reverse-Acting V46N Valves Are Typically Used For Bypass Service On Refrigeration Systems And Heat Pump Applications. Commercial V46 Valves May Be Used With Standard Non-Corrosive Refrigerants. V46 Models Are Also Available For Ammonia Refrigerant. For Applications Where The Coolant May Be Corrosive To The Valve Trim, Maritime Models Are Available, Which Have Nickel Copper (Monel) Valve Trim. Made in United States. Manufactured by Johnson Controls.