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MÔ TẢ SẢN PHẨM :
VRN2 Dynamic Pressure Regulating Control Ball Valves
Van điều khiển chênh áp tự và lưu lượng động kết hợp với van điện điều khiển
The VRN2 two-way dynamic pressure-regulating control ball
valves maintain constant flow of hot or chilled water in closedloop heating, ventilating, and air conditioning (HVAC Division
23) systems 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) with minimum torque of 35 lbin (4 Nm) on valve sizes up to 3 inches (DN80).
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 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. • 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.
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