The Honeywell VRN2F1PX8200 Valve Assembly consists of a 2" NPT normally closed 2-way valve and MS4105A1030 Two-Position SPST Direct Coupled Actuator.  Used to control the flow of hot or chilled water with glycol solutions up to 50% in closed-loop heating, ventilating, and air conditioning (HVAC Division 23) systems. 

The VRN2 two-way pressure independent control valves maintain constant flow regardless of head pressure fluctuations above the minimum specified pressure drop. These valve assemblies can be used with Honeywell non-spring return or spring return direct coupled actuators (DCA).

The built-in differential pressure regulator makes fluid flow through the valve independent of changes in supply pressure, eliminating “hunting” by the control system, even at low coil flow. The pressure regulator virtually eliminates cavitation in the valve, and decouples the control valve from the effects of piping components such as reducers and elbows.

Pressure independent control valves are sized to match design coil flow regardless of coil size. VRN2 valves eliminate the need to balance the system for proper flow, and allow chillers to be operated at design temperature differential for maximum efficiency at every load condition. When used in a system with variable speed pump drives, 3-way valves and coil bypass lines are not required. In new construction, VRN2 valves perform better than reverse return piping designs without the extra materials these systems need.

Pressure-independent control requires less flow, enabling use of smaller piping, pumps, and chillers.

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 flow control accuracy of ±5%.
• Equal percentage flow characteristic using patented flow control ball insert.
• Multiple maximum flow rates available per valve size.
• Patented ball seals for low operating torque.
• Nickel-chrome plated brass or stainless steel trim.
• Choice of factory-installed actuation using Honeywell MVN or MN/MS series direct coupled actuators: Floating, Modulating (2-10 V), Non-Spring Return and Spring Return.
• Spring return actuators field-configurable for normally open or normally closed fail-safe position.
• 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 effect of system pressure fluctuations and entrapped air while improving flow performance.