Honeywell NK300 Product specification sheet
Construction
The refilling combination consists of:
• Ball valve, up- and downstream
• Complete backflow preventer with discharge connection, valve cartridge (incl. integrated check valve and discharge valve,
upstream), integrated strainer upstream (mesh size approx.
0.6 mm), check valve downstream and three test points with
closing plug
• Complete pressure reducing valve with valve insert (incl. diaphragm and valve seat), spring hood (incl. adjustment screw),
adjustment spring and pressure gauge
Materials
• Dezincification-resistant brass housing
• Discharge connection, valve cartridge, valve insert and spring
hood in high-grade synthetic material
• Fibre-reinforced NBR diaphragm
• Seals in NBR and EPDM
• Spring steel adjustment spring
• Stainless steel fine filter sieve
EN0H-1232GE23 R0506 y Subject to change without notice
NK300
Refilling combination
Product specification sheet
Application
The refilling combination serves filling and refilling of closed heating systems to DIN EN 12828:2003.
It can be connected in accordance to EN 1717 constantly with
the drinking water supply.
The refilling combination combines backflow preventer, pressure
reducing valve and two ball valves in one appliance.
All devices for refilling a heating installation according to conforming standards are contained.
Special Features
• All components DIN/DVGW approved
• Constant connection with the drinking water supply in accordance with EN1717 by hose line or piping is possible
• Optimal protection of the drinking water supply system
• Backflow preventer approved for noise level protection,
class 2
• Pressure reducing valve approved for noise level protection,
class 1
• Triple security - two check valves and a discharge valve separate the backflow preventer into three pressure zones
• Pressure reducing valve with inlet pressure balancing - inlet
pressure fluctuation does not influence the outlet pressure
• Outlet pressure adjustable and directly at the pressure gauge
readable
• Low maintenance effort - cartridge insert and valve insert are
completely replaceable
• Meets KTW recommendations for potable water
Range of Application
Medium Water
Inlet pressure max. 10.0 bar
Outlet pressure 1.5-4 bar adjustable, preset to 1.5 bar
Liquid category
Backflow Preventer BA
Technical Data
Installation position horizontal pipework with discharge
Operating temperature max. 65 °C
Connection ball valve
Backflow preventer
Connection size
Discharge
Connection size
4 (toxic, highly toxic, tumourigenic,
radioactive materials)
connection directed downwards
1
G
/4"
HT 50
1
/2" external threads
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NK300 Refilling combination
Ø50mm
l1
Connection size R
Weight kg 1.4
Dimensions mm
l2
L
1
H 236
1 74
h
h2 162
L 232
1 59
l
l2 114
/2"
h1
h2
Method of Operation
The refilling combination combines backflow preventer, pressure
reducing valve and ball valves in one appliance.
The backflow preventer is a safety device in accordance with
EN 1717 to protect systems against back pressure, back flow
and back syphonage of non-potable water into service pipe,
plants and equipments.
The backflow preventer is separated in three chambers (inlet,
H
middle and outlet chamber).
If no water is drawn from the downstream system, the backflow
preventer is in normal position. The up- and downstream check
valves and the discharge valve are closed.
If water is drawn from the downstream system, the backflow preventer is in flow position. The check valves up- and downstream
are opened and the discharge valve is closed.
The backflow preventer changes to shut-off position (back pressure) if the differential pressure between middle- and inlet chamber falls under 0.14 bar. The check valves are closed and the
discharge valve is opened.
The pressure reducing valve reduces the pressure on the inlet
side (admission pressure) to the level of the desired pressure on
the outlet side (outlet pressure) in individual cases.
The pressure reducing valve functions on a force equalisation
principle. The force of a diaphragm operates against the spring
force of the regulating valve. If the outlet pressure and therefore
diaphragm force fall because water is drawn, then the greater
force of the spring causes the valve to open. The outlet pressure
then increases until the forces between the diaphragm and the
spring are equal again.
The inlet pressure (admission pressure) has no influence on the
regulating valve of the pressure reducing valve. Inlet pressure
fluctuation does not influence the outlet pressure, thus providing
inlet pressure balancing.
TK295
ZR06K
TKA295
3x
WS300NK
3x
Options
NK300-1/2A = Standard version with threaded connection
1
R
/2"
Accessories
TK295 Test kit
Electronic pressure measuring device with digital indicator, runs by a battery.
With case and accessories, ideal for inspection and
maintenance of backflow preventer type BA.
TKA295 Test kit
Analogue pressure measuring device with differential
pressure display.
With case and accessories, ideal for inspection and
maintenance of backflow preventer type BA.
ZR06K Double ring spanner
For removal of spring hood and filter bowl
WS300NK Maintenance set
Maintenance set for refilling combination NK300 for
use with TK295 resp. TKA295
EN0H-1232GE23 R0506 y Subject to change without notice
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