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t-NEXT DF DX
OPTIONAL ACCESSORIES: P021 – 2-WAY BALL BY-PASS VALVE
UNDER Version
T1
HE
T2
PF
Air flow
Water Inlet / Outlet
Main circuit
T_tNEXTDFDX_0719_EN
The optional is available for main chilled water circuit only.
2-way motorized valve with 0÷10 VDC control actuator and emergency manual control for the third way
(by-pass) of the hydraulic circuit.
The valve is in combination with the main 2-way water flow control valve.
The optional accessory is factory installed and don't modify the overall dimensions of the unit.
The coupling to the main 2-way control valve of a second modulating valve, connected in by-pass,
allows to obtain the same control system of a 3-way mixing valve for plant with constant water flow.
At the same time the appropriate sizing of these valves allows hydraulic balancing of the by-pass way.
This type of valve offers the following series of benefits:
•
Equal percentage flow control.
•
No peaks initial flow.
•
Excellent stability control thanks to the integrated characterizing disc.
•
Excellent characteristic in partialisation.
•
Stability in control.
•
Maintenance free.
•
Self-cleaning.
CHARACTERISTICS OF THE 2-WAY BALL VALVE
•
Closing seal with leakage rate in Class A (EN 12266-1)
•
Maximum fluid pressure Ps=1600kPa
•
Maximum closing pressure (Close-off) ∆Ps=1400kPa
The rotative actuator is controlled by a signal 0 ... 10VDC from the microprocessor controller. The
actuator is equipped with an emergency button for manual operation and is maintenance-free.
LEGENDA
M1
Air flow
M3
HE
PF
T1
T2
Tin
M3
M1
Tin
2-way modulating valve for
main coil
2-way modulating valve for by-
pass
Main coil
Plug Fan.
Air return temperature probe
Air supply temperature probe
Chilled water inlet temperature
probe
Air flow
39
OVER Version
T2
HE
T1
M3
M1
Water Inlet / Outlet
Main circuit
Air flow
PF
Tin
MEHITS S.p.A.
DATA BOOK
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