Brochure

106 63-8702
NK300S-100
The NK300S Boiler Feed Combination serves as a boiler fill valve
used in closed loop heating systems. The NK300S is a (re filling
combination valve that contains an integrated pressure reducing
valve, strainer, double check backflow preventer with air vent (to
protect potable water supply against back flow of heating water
into supply pipe), two shut-off ball valves, pressure gauge, and
conveniently located test ports for easy inspections and check out.
• Low maintenance effort - cartridge insert and valve insert are
completely replaceable allowing inline serviceability. Permanent
connection with the drinking water supply by hose line or piping is
possible
• Optimal protection of the drinking water supply system with use of
DCuV.
• Pressure reducing valve with inlet pressure balancing -inlet
pressure fluctuation does not influence the outlet pressure.
• Outlet pressure adjustable and directly visible on the pressure gauge.
Model: NK300S BOILER FEED COMBINATION
Model Numbers: NK300S-100 (includes sweat, threaded, and Viega
ProPress Connections)
Medium: Water
Regulator Mechanism: Fiber-reinforced EPDM diaphragm
Filter Mechanism: Stainless steel fine filter mesh
Inlet Pressure (Maximum): 150 psi (10.3 bar)
Inlet Pressure (Min): 30 psi (2.0 bar)
Outlet Pressure Range: 10 psi - 58 psi (0.7 bar - 4.0bar)
Outlet Pressure: Factory set at 15 psi (1 bar)
Pressure setting tolerance: ± 4 psi.
Differential: 14.5 psi minimum (inlet to outlet)
Fluid Temperature (Maximum): 180°F (82°C) according ASSE 1081
Ambient Temperature Range: 33°F to 140°F (1°C to 60°C).
Pressure Gauge: 0-60 psi @ max temp 140°F (60°C)
Connection size: 1/2" NPT or sweat
Connection size discharge: 1/4" NPT
Connection size test ports: 1/4" NPT
Installation position: horizontal pipework with discharge connection
directed downwards
Max. flow rate: 16 gpm (60 l/min) @ 22 psi (1.5 bar)
Approvals: ASSE 1081 Listed
Body: Dezincification resistant brass housing
Internal Parts: 1/4" NPT Discharge connection, valve cartridge, valve
insert and spring bonnet in high-grade synthetic material
Seals: NBR and EPDM
Steel Adjustment Spring: Steel
*Boiler Trim Kits available with NK. See Boiler Trim Kit section.
Material Number Description Maximum Safe Operating Pressure (psi) Maximum Safe Operating Pressure (kPa) Connection Type
NK300S-100 NK300S Boiler Feed Combination including
sweat and threaded connections
150 psi 1034 kPa Includes Sweat and
threaded connections
NK300S-100UP NK300S Boiler Feed Combination including
union press fitting connections
150 psi 1034 kPa Includes Union press
fittings connections
NK300 Replacement Parts
Material Number Description
0901443 X10 SEAL RING SET PRV/FILTER/SG/NK 1/2
0903733 CARTRIDGE INSERT COMPL. BA/NK 1/2-1
0904181 PRESSURE GAUGE 1/4" NPT 0-87PSI (0-6BAR)
0904182 CHECK VALVE INSERT NK300S-100
D04FMA-1/2 PRV CARTRIDGE D04FM F NK300S+SE
S06K-1/4NPT (BP5) PLASTIC PLUG NPT
Boiler Fill Valves