Overview The VRN2 two-way dynamic pressure-regulating control ball valves maintain constant flow of hot/chilled water in closed loop heating, ventilating, and air conditioning (HVAC) systems regardless of head pressure fluctuation above minimum pressure drop. Features Sizes from 1/2 to 3 in. with internal (female) NPT connections. Controls hot or chilled water with up to 50% glycol. Regulated flow rates available from 1 to 95 gpm. Differential pressure regulator for constant pressure drop across valve seat. Positive pressure, rolling diaphragm regulator design for long service life for flow control accuracy of ±5% over specified control range. Equal percentage flow characteristic using patented flow control ball insert. Multiple regulated flow rates available per valve size. Patented ball seals require low operating torque. Nickel-chrome plated brass or stainless steel trim. Choice of factory-installed actuation using Honeywell N05/S05-series direct-coupled actuators: Floating, Modulating (2-10 V), Spring Return Modulating/Floating. Spring return actuators field-configurable for normally open or normally closed fail-safe position. Actuators available with optional auxiliary switches. Removable, manual operating handle to control valve during installation or in an event of power failure. Upstream Test Port for venting or pressure gauge attachment. Three actuator orientations on the valve for cramped spaces. Integral snubber eliminates affect of system pressure fluctuations and entrapped air while improving flow performance. Product Specifications ApplicationPressure-regulating in closedloop heating, ventilating, and air conditioning systems Dimensions (in.)8-9/16 in. x 3 in. x 8-3/8 in. Dimensions (mm)218 mm x 76 mm x 213 mm Maximum Safe Operating Pressure (psi)360 psi Maximum Safe Operating Pressure (kPa)2500 kPa Comments2 - 10V position feedback signal Operating Temperature Range (F)Maximum Safe Operating--248 F Operating Temperature Range (C)Maximum Safe Operating--120 C Ambient Temperature Range (F)14 F to 131 F Ambient Temperature Range (C)-10 C to 55 C Accuracy±5% over specified pressure range Maximum flow rate (gpm)2.0 gpm Connection TypeFemale-NPT Body Pattern2-way, straight-through Pipe Size (inch)1/2 in. Pipe Size (DN)DN15 Fluid Temperature (C)-30 C to +121 C Fluid Temperature (F)-22 F to +250 F Maximum Differential Pressure Ratings (Close-off) (psi)100 psid Maximum Differential Pressure Ratings (Close-off) (kPa)690 kPa Valve ActionQuarter-turn rotary Valve TypeDynamic pressure-regulated control valve Controlled FluidChilled or hot water with up to 50% Glycol. Not for use with steam or fuels. Materials (Body)Forged Brass ASTM B584 Materials (Seat)Teflon seals / EPDM O-rings Materials (Stem)Stainless Steel Flow CharacteristicEqual Percentage with flow control insert ActuationMN7505 Modulating DCA Stem Travel (in.)90 deg. rotation Materials (Plug/Ball/Disc)Stainless Steel Materials (Packing)Teflon seals / EPDM O-rings Materials (Diaphragm)Hydrogenated Acrylonitrile Butadiene Rubber Materials (Regulator)Stainless Steel Head Loss Range (psi)3.0 psid to 35 psid Head Loss Range (ft)6.5 ft to 76 ft Head Loss Range (kPa)21 kPa to 240 kPa Maximum flow rate (m3/h)0.45 m3/h