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  • Products
    Products:
    • Air and dirt separation devices
      Air and dirt separation devices:
      • Air vents for radiators
        Air vents for radiators:
        • Accessories for manual air vents
        • Drain cock for radiators
        • Hygroscopic air vents for radiators
        • Manual air vents for radiators
      • Automatic air vents
        Automatic air vents:
        • Accessories for automatic air vents
        • Air vents for radiators
        • Automatic air vents with high discharge capacity
        • Compact automatic air vents
        • Standard automatic air vents
      • Deaerators for boiler systems or chiller, with technical room
        Deaerators for boiler systems or chiller, with technical room:
        • Brass deaerators
      • Deaerators for heat pumps
        Deaerators for heat pumps:
        • High-efficiency deaerator
      • Deaerators for large systems
        Deaerators for large systems:
        • Steel deaerators
      • Deaerators for medium-large systems
        Deaerators for medium-large systems:
        • Brass deaerators
        • Steel deaerators
      • Deaerators for wall-hanging boiler systems
        Deaerators for wall-hanging boiler systems:
        • Technopolymer deaerators
      • Dearators-dirt separators
        Dearators-dirt separators:
        • Deaerators-dirt separators for boiler systems or chiller, with technical room
        • Deaerators-dirt separators for large systems
        • Deaerators-dirt separators for medium-large systems
        • Dearators-dirt separators for heat pump systems
      • Dirt separators for boiler systems or chiller, with technical room
        Dirt separators for boiler systems or chiller, with technical room:
        • Dirt separator with double magnet for high flow rates
        • Technopolymer dirt separators with magnet
        • Water treatment kit
      • Dirt separators for heat pump systems
        Dirt separators for heat pump systems:
        • Multifunction device in technopolymer with dirt separator and strainer
        • Semi-automatic self-cleaning magnetic filter
      • Dirt separators for large systems
        Dirt separators for large systems:
        • Self-cleaning magnetic filters dirt separators
        • Steel dirt separators with magnet
      • Dirt separators for medium/large systems
        Dirt separators for medium/large systems:
        • Brass dirt separators with magnet
        • Steel dirt separators with magnet
        • Technopolymer magnetic filters dirt separators
      • Dirt separators for wall-hanging boiler systems
        Dirt separators for wall-hanging boiler systems:
        • Accessories for magnetic filters dirt separators
        • Under-boiler dirt separator strainer with magnet
        • Under-boiler magnetic filters dirt separators
        • Water treatment kit
      • Domestic hot water treatment
        Domestic hot water treatment:
        • Polyphosphate dispenser
        • Water treatment kit
      • High-efficiency deaerators at air collection points
        High-efficiency deaerators at air collection points:
        • High-efficiency deaerators at air collection points
      • Water treatment
        Water treatment:
        • Chemical additives
        • Compact water treatment units
        • Demineralisation cartridges
        • Softening cartridges
    • Backflow prevention devices
      Backflow prevention devices:
      • Backflow prevention devices
        Backflow prevention devices:
        • BA type backflow prevention devices
        • BA type backflow prevention devices with cartridge
        • CAa type backflow prevention devices
        • CAb type backflow prevention devices
        • Pre-assembled group with ba type backflow prevention device
        • Spare parts for backflow prevention devices
      • Check valves
        Check valves:
        • Ball valves with built-in check valves
        • Check valves for removable connection
        • EA type check valves
        • EA type check valves with built-in shut-off valve
        • EB type check valves
        • EC type double check valve
      • Strainers
        Strainers:
        • Flanged filters for domestic hot water systems
        • Threaded filters for domestic hot water/heating systems
    • Balancing and control devices
      Balancing and control devices:
      • Automatic flow rate regulator (AUTOFLOW®)
        Automatic flow rate regulator (AUTOFLOW®):
        • Automatic flow rate regulator and ball valve
        • Automatic flow rate regulator
        • Automatic flow rate regulator with stainless steel cartridge and ball valve
        • Automatic flow rate regulator with stainless steel cartridge
        • Automatic flow regulator with stainless steel cartridge, flanged
        • Compact automatic flow rate regulator
        • Compact automatic flow rate regulator, in line
        • Spare polymer cartridges, for 121 and 126 series
        • Spare polymer cartridges, for 127 series
        • Spare polymer cartridges, for 128 series
        • Spare stainless steel cartridges
      • Butterfly valves
        Butterfly valves:
        • Accessories for butterfly valves
        • Butterfly valves - lug type
        • Butterfly valves - wafer type
        • Rotational actuator for butterfly valves
      • Differential pressure control devices
        Differential pressure control devices:
        • Differential by-pass valve
        • Differential pressure control valve (DPCV)
        • Measurement and control accessories
      • Dynamic balancing and control devices
        Dynamic balancing and control devices:
        • Cast iron pressure independent control valves (PICV)
        • Connection and regulation kit
        • Pressure independent control valves (PICV)
      • Regulating globe valves
        Regulating globe valves:
        • Brass regulating valve
        • Cast iron regulating valve
        • Linear actuator for regulating valves
      • Regulating mixing valves
        Regulating mixing valves:
        • Actuators
        • Brass mixing regulation valves
        • Cast iron mixing regulation valves
        • Regulators
      • Static balancing devices
        Static balancing devices:
        • Balancing valve with flow meter
        • Balancing valves
        • Measurement and control
    • Components for central heating systems
      Components for central heating systems:
      • Charging units
        Charging units:
        • Boiler filling loop
        • Charging unit with BA type backflow preventer
        • Charging unit with CA type backflow preventer
        • Compact charging unit with BA type backflow preventer
        • Standard filling units
      • Check valves
        Check valves:
        • Standard ball valves with built-in check valves
      • Components for heat pump systems
        Components for heat pump systems:
        • Antifreeze valve
        • Antifreeze valve with air sensor
        • Balancing valve with flow meter
        • Buffer tank - hydraulic separator
        • Changeover and distribution unit radiant panel fan-coil - system
        • Differential by-pass valve
        • Diverter valves for heat pump systems
        • High-efficiency deaerator for heat pump systems
        • Instrument holder kit in technopolymer
        • Technopolymer Deaerators-dirt separators
        • Technopolymer magnetic filters dirt separators
      • Control devices and accessories
        Control devices and accessories:
        • Accessories
        • Air separators
        • Flow switches
        • Pressure and float switch
        • Pressure gauges
        • Temperature gauges
        • Temperature/pressure gauge
        • Thermostats
      • Differential pressure control devices
        Differential pressure control devices:
        • Differential by-pass valve
      • Expansion vessels
        Expansion vessels:
        • Accessories for expansion vessels
      • Hydraulic separators
        Hydraulic separators:
        • Multifunction hydraulic separator
        • Standard hydraulic separator
      • Hydraulic separators-manifolds
        Hydraulic separators-manifolds:
        • Accessories for SEPCOLL
        • SEPCOLL (outlet centre distance 125 mm)
        • SEPCOLL (outlet centre distance 90 mm)
      • Instrument holders
        Instrument holders:
        • Brass instrument holder
        • Instrument holder kit in technopolymer
      • Manifolds for central heating system
        Manifolds for central heating system:
        • Accessories for manifold for central heating system
        • Compact manifold for central heating system DN 25
        • Compact manifold for central heating system DN 32
      • Safety relief valves for domestic water systems
        Safety relief valves for domestic water systems:
        • Safety relief valves
        • Temperature and pressure relief valves
      • Safety relief valves
        Safety relief valves:
        • Accessories for safety relief valves
        • NF safety relief valves
        • Standard safety relief valves
        • TUV safety relief valves
      • Strainers
        Strainers:
        • Flanged filters for heating systems
        • Threaded filters for domestic hot water/heating systems
      • Supply units
        Supply units:
        • Accessories for units
        • Direct supply units
        • Motorised regulating units
        • Spare parts for regulating units
        • Temperature regulators
        • Thermostatic regulating units
    • Components for domestic water system
      Components for domestic water system:
      • Check valves
        Check valves:
        • Check valves for removable connection
        • EC type double check valve
        • Standard ball valves with built-in check valves
      • Control devices for domestic water systems
        Control devices for domestic water systems:
        • Anti-freeze safety devices
        • Expansion vessels for domestic water systems
        • Flow limiter
        • Housing and strainer cartridges
        • Vacuum breaker device
        • Water hammer arrester
      • Electronic mixing valves
        Electronic mixing valves:
        • Electronic mixing valve with thermal disinfection - 230 V
        • Electronic mixing valve with thermal disinfection - 24 V
        • Hybrid electronic mixing valves
        • Spare parts for electronic mixing valve with thermal disinfection, flanged connections - 230 V
        • Spare parts for electronic mixing valve with thermal disinfection, flanged connections - 24 V
        • Spare parts for electronic mixing valve with thermal disinfection, threaded connections - 230 V
        • Spare parts for electronic mixing valve with thermal disinfection, threaded connections - 24 V
        • Spare parts for hybrid electronic mixing valves
      • Manifolds for domestic water systems
        Manifolds for domestic water systems:
        • Accessories for manifolds 359 series
        • Accessories for modular manifolds
        • Accessories for standard manifold
        • Distribution manifolds with individual shut-off valves
        • Distribution manifolds with main shut-off valves
        • Inspectable distribution manifolds with main shut-off valves
        • Inspectable unit with main shut-off valves
        • Pressfittings with fixing clips
        • Spare parts for manifolds 359 series
        • Standard distribution manifold with individual shut-off valves
        • Unit with main shut-off valves
      • Pressure reducing valves
        Pressure reducing valves:
        • Accessories for combined group for pressure control
        • Combined group for pressure and temperature control
        • Combined group for pressure control
        • Compact pressure reducing valves for high temperature
        • Compact pressure reducing valves
        • Micro pressure reducing valves
        • Pre-adjustable pressure reducing valves for high temperature
        • Pre-adjustable pressure reducing valves
        • Pressure reducing and regulating valves
        • Pressure reducing valves for first stage control
        • Spare parts for pressure reducing valves
        • Standard pressure reducing valves for high temperature
      • Safety groups for domestic water systems
        Safety groups for domestic water systems:
        • Expansion groups for hot water storage heaters
        • Safety groups for hot water storage heaters
      • Safety relief valves for domestic water systems
        Safety relief valves for domestic water systems:
        • Temperature and pressure relief valves
      • Thermostatic mixing valves
        Thermostatic mixing valves:
        • "L" pattern adjustable thermostatic mixing valve
        • Anti-scald thermostatic mixing valves at the point of use
        • Combined group for pressure and temperature control
        • Thermostatic mixing valves for commercial applications
        • Thermostatic mixing valves for installation at the point of distribution
        • Thermostatic mixing valves for small applications
        • Thermostatic mixing valves with thermal disinfection
      • Thermostatic regulator for domestic hot water recirculation circuits
        Thermostatic regulator for domestic hot water recirculation circuits:
        • Multifunction thermostatic regulators
        • Standard thermostatic regulators
        • Thermostatic regulator with built-in check valve
    • Components for renewable energy systems
      Components for renewable energy systems:
      • Automatic air vents and deaerators for solar thermal systems
        Automatic air vents and deaerators for solar thermal systems:
        • Automatic air vents for solar thermal systems
        • Deaerators for solar thermal systems
        • Manual air separator for solar thermal systems
      • Control devices for biomass systems
        Control devices for biomass systems:
        • Anti-condensation recirculation and distribution unit
        • Anti-condensation valve
      • Direct heat meter
        Direct heat meter:
        • Turbine heat meter for solar systems
      • Fittings for solar thermal systems
        Fittings for solar thermal systems:
        • Mechanical O-ring seal for solar thermal systems
        • Three-piece union fitting
      • Geothermal manifold
        Geothermal manifold:
        • Accessories for geothermal manifold
        • Geothermal modular manifold
        • Preassembled geothermal manifold
        • Shut-off and balancing valves for geothermal manifold
      • Motorised diverter valve for solar thermal systems
        Motorised diverter valve for solar thermal systems:
        • Thermostatic diverter valves for solar thermal systems
      • Pump stations for solar thermal systems
        Pump stations for solar thermal systems:
        • Accessories and spare parts for pump stations for solar thermal systems
        • Expansion vessels for solar thermal systems
        • Pump stations for solar thermal systems
        • Regulator for solar thermal systems
      • Safety devices for solar thermal systems
        Safety devices for solar thermal systems:
        • Anti-freeze devices
        • Safety relief valves for solar thermal systems
        • Temperature and pressure relief valves for solar thermal systems
      • Safety relief valves for biomass systems
        Safety relief valves for biomass systems:
        • Draught regulating valve
        • Temperature relief valves with automatic filling
        • Temperature safety relief valves
      • Shut-off and balancing valves for solar thermal systems
        Shut-off and balancing valves for solar thermal systems:
        • Balancing valves for solar thermal systems
        • Shut-off valves for solar thermal systems
      • Solar storage-to-boiler connection kit
        Solar storage-to-boiler connection kit:
        • Solar storage-to-boiler motorised connection kit
        • Solar storage-to-boiler thermostatic connection kit
      • Spare parts for circulation units
        Spare parts for circulation units:
        • Spare parts for circulation units for 255 series
        • Spare parts for circulation units for 278-279 series
      • Thermostatic mixing valve for solar thermal systems
        Thermostatic mixing valve for solar thermal systems:
        • Solar thermostatic mixing valve for commercial applications
        • Solar thermostatic mixing valve for domestic applications
        • Solar thermostatic mixing valve for point of use
      • Zone/diverter valves
        Zone/diverter valves:
        • Zone/diverter ball valves (three-way)
    • Expansion vessels, chrono-thermostatic, thermostats
      Expansion vessels, chrono-thermostatic, thermostats:
      • Control devices for autoclaves
        Control devices for autoclaves:
        • Pressure switch and float switch
      • Expansion vessels
        Expansion vessels:
        • Accessories for expansion vessels
        • Expansion vessels for domestic water systems
        • Expansion vessels for heating systems
      • Temperature regulators, thermostats and chrono-thermostats
        Temperature regulators, thermostats and chrono-thermostats:
        • Chrono-thermostats
        • Temperature regulators
        • Thermostats
    • Fittings
      Fittings:
      • Fittings for solar thermal systems
        Fittings for solar thermal systems:
        • Accessories and spare parts for deca-fittings
        • Compression fittings with O-ring seal
        • Fittings for PE-X pipes
        • Fittings for iron pipes
        • Fittings for polyethylene pipes
        • Spare parts for mechanical fittings with O-ring seal
        • Three-piece fittings
        • Unions
    • Gas safety
      Gas safety:
      • Gas control devices and accessories
        Gas control devices and accessories:
        • Gas accessories
        • Gas detector
        • Signal and alarm accessories
      • Gas filters and regulators
        Gas filters and regulators:
        • Gas filters
        • Strandard gas filters and regulators
      • Gas solenoid valves
        Gas solenoid valves:
        • Solenoid valves for gas NC with automatic reset
        • Solenoid valves for gas NC with manual reset
        • Solenoid valves for gas NO with manual reset
        • Spare parts for gas solenoid valves
    • Heat systems
      Heat systems:
      • Direct heat meter
        Direct heat meter:
        • Options
        • Turbine heat meter
        • Ultrasonic direct heat meters
      • Mechanical wall mounted heat interface unit
        Mechanical wall mounted heat interface unit:
        • Completion codes for mechanical heat interface units
        • Mechanical wall mounted heat interface unit
      • Plurimod user modules
        Plurimod user modules:
        • 2-3 way plurimod user module
        • Pre-assembled unit for three users
        • Self-balanced plurimod user module
        • User module with automatic flow rate control
      • Recess PLURIMOD user module with distribution manifold
        Recess PLURIMOD user module with distribution manifold:
        • Recess 2-3 way user module with distribution manifold
        • Recess self-balanced user module with distribution manifold
      • Recess mounted heat interface unit with electronic regulation
        Recess mounted heat interface unit with electronic regulation:
        • Recess mounted direct heat interface unit with basic regulation
        • Recess mounted indirect heat interface unit with basic regulation
      • Recess user modules with metering
        Recess user modules with metering:
        • Recess user module with 2 way zone valve
        • Recess user module with 3 way zone valve
      • Supply and regulating units ready for heat metering
        Supply and regulating units ready for heat metering:
        • Supply and regulating units ready for heat metering
      • Wall mounted heat interface units with electronic regulation
        Wall mounted heat interface units with electronic regulation:
        • Completion codes for heat interface units with electronic regulation
        • DHW only heat interface unit
        • Direct heat interface unit with advanced electronic regulation
        • Direct heat interface unit with basic electronic regulation
        • Indirect heat interface unit for storage DHW production
        • Indirect heat interface unit with advanced electronic regulation
        • Indirect heat interface unit with basic electronic regulation
      • Wall mounted indirect cooling interface unit
        Wall mounted indirect cooling interface unit:
        • Wall mounted indirect cooling interface unit
      • Water meter for domestic water systems
        Water meter for domestic water systems:
        • Domestic water meter kit for PLU
        • Domestic water meter kit with shut-off ball valves
        • Water meters for domestic cold and hot water
    • Radiant panel system control
      Radiant panel system control:
      • Distribution manifolds for radiant panel systems
        Distribution manifolds for radiant panel systems:
        • Accessories for distribution manifolds
        • Accessories for manual distribution manifolds in technopolymer
        • Brass distribution manifolds for radiant panel systems, 1" connections
        • Brass distribution manifolds for radiant panel systems, connections 1" and 1 1/4"
        • Changeover and distribution unit radiant panel fan-coil - system
        • Distribution manifolds for radiant panel systems, 1" connections
        • Dynamic distribution manifolds in brass
        • Manual distribution manifolds in technopolymer
        • Spare parts for distribution manifolds
      • Inspection wall boxes and wall ports
        Inspection wall boxes and wall ports:
        • Boxes for distribution manifolds (110 - 140 mm)
        • Boxes for distribution manifolds (110 - 150 mm)
        • Boxes for distribution manifolds (80 - 120 mm)
      • Regulating units for radiant panel systems
        Regulating units for radiant panel systems:
        • Accessories and spare parts for modulating temperature regulating unit
        • Accessories for set point thermostatic regulating unit
        • Modulating temperature regulating unit with digital regulator
        • Set point thermostatic regulating unit with medium distribution kit for primary circuit
        • Set point thermostatic regulating units
        • Thermostatic mixing valve for radiant panel systems
      • Thermo-electric actuators
        Thermo-electric actuators:
        • Control bar
        • Thermo-electric actuator (with push fit connection)
        • Thermo-electric actuator (with threaded connection)
    • Valves and accessories for radiators
      Valves and accessories for radiators:
      • Accessories and spare parts for radiator valves
        Accessories and spare parts for radiator valves:
        • Accessories for radiator valves
        • Spare parts for radiator valves
      • Accessories and spare parts for radiators
        Accessories and spare parts for radiators:
        • Accessories for radiators
        • Drain cock for radiators
      • Convertible radiator valves
        Convertible radiator valves:
        • Convertible radiator valves (for copper pipe)
        • Convertible radiator valves (for steel pipe)
      • Convertible radiator valves with pre-setting
        Convertible radiator valves with pre-setting:
        • Convertible radiator valves with pre-setting (for copper pipe)
        • Convertible radiator valves with pre-setting (for steel pipe)
      • Convertible radiator valves, control head and lockshield valves HIGH-STYLE
        Convertible radiator valves, control head and lockshield valves HIGH-STYLE:
        • Control head for convertible radiator valves, black finish
        • Control head for convertible radiator valves, chrome finish
        • Control head for convertible radiator valves, white finish
        • Convertible radiator valve and lockshield valve for heating systems
        • Convertible radiator valves, black finish
        • Convertible radiator valves, chrome finish
        • Convertible radiator valves, white finish
      • Fittings
        Fittings:
        • Accessories for fittings
        • Fittings with standard threaded connections
        • Fittings with threaded connections 23 p. 1.5
      • Lockshield valves
        Lockshield valves:
        • Lockshield valves for copper pipe
        • Lockshield valves for steel pipe
      • Manual radiator valves
        Manual radiator valves:
        • Lockshield valves for copper pipe
        • Lockshield valves for steel pipe
        • Radiator valves for copper pipe
        • Radiator valves for steel pipe
      • Radiator valves for one-pipe and two-pipe systems
        Radiator valves for one-pipe and two-pipe systems:
        • Convertible radiator valves for one-pipe and two-pipe designer heating systems
        • Convertible radiator valves for one-pipe and two-pipe systems
        • Convertible radiator valves for one-pipe systems
        • Manual valve for one-pipe systems
        • Manual valve for two-pipe systems
        • Spare parts for one-pipe and two-pipe radiator valves
      • Remote thermal regulation system (CALEFFI CODE®)
        Remote thermal regulation system (CALEFFI CODE®):
        • Accessories for remote thermal regulation system for radiators
        • Remote thermal regulation system, black
        • Remote thermal regulation system, white
      • Thermo-electric actuators
        Thermo-electric actuators:
        • Thermo-electric actuator (with push-fit connection)
        • Thermo-electric actuator (with threaded connection)
      • Thermostatic control heads
        Thermostatic control heads:
        • Accessories for thermostatic control heads
        • Thermostatic control head with remote adjusting knob
        • Thermostatic control heads with built-in sensor
        • Thermostatic control heads with contact probe
        • Thermostatic control heads with remote sensor
      • Thermostatic valves
        Thermostatic valves:
        • Dynamic thermostatic radiator valves (for copper pipe)
        • Dynamic thermostatic radiator valves (for steel pipe)
        • Thermostatic valves (for copper pipe)
        • Thermostatic valves (for steel pipe)
      • Valves for panel radiators
        Valves for panel radiators:
        • Valves for panel radiators - double fitting
        • Valves for panel radiators - single fitting
      • Wall-covering plates
        Wall-covering plates :
        • Double wall-covering plates
        • Single wall-covering plates
    • Zone and motorised valves, distribution manifolds, boxes and accessories
      Zone and motorised valves, distribution manifolds, boxes and accessories:
      • Accessories
        Accessories:
        • Accessories
      • Distribution manifolds with shut-off and pre-regulating valves
        Distribution manifolds with shut-off and pre-regulating valves:
        • Accessories for manifolds - 1 1/4" connections
        • Accessories for manifolds - 1" connections
        • Pre-assembled distribution manifolds with shut-off and pre-regulating valves - 1 1/4" connections
        • Pre-assembled distribution manifolds with shut-off and pre-regulating valves - 1" connections
        • Single distribution manifolds with shut-off and pre-regulating valves - 1 1/4" connections
        • Single distribution manifolds with shut-off and pre-regulating valves - 1" connections
      • Dual distribution manifolds
        Dual distribution manifolds:
        • Accessories for dual distribution manifolds
        • Dual distribution manifolds
      • Fittings
        Fittings:
        • Fittings with standard threaded connections
        • Fittings with threaded connections 23 p. 1.5
      • Inspection wall boxes and wall ports
        Inspection wall boxes and wall ports:
        • Brackets for inspection wall boxes
        • Plastic inspection wall box
        • Sheet steel inspection wall boxes (110 - 140 mm)
        • Sheet steel inspection wall boxes (80 - 120 mm)
      • Single distribution manifolds
        Single distribution manifolds:
        • Blind single distribution manifolds
        • Single distribution manifolds - female outlet
        • Single distribution manifolds - male outlet
        • Single distribution manifolds for air conditioning systems
        • Single distribution manifolds with shut-off valves
      • Thermo-electric actuators
        Thermo-electric actuators:
        • Thermo-electric actuator (with push to fit connection)
        • Thermo-electric actuator (with threaded connection)
      • Zone/diverter valves
        Zone/diverter valves:
        • Motorised ball zone valves
        • Motorised ball zone valves with insulation
        • Motorised three-way ball valves for high flow rates - "L" drilling
        • Motorised three-way ball valves for high flow rates - "T" drilling
        • Motorised two-way ball valves for high flow rates
        • Motorised zone valves with spring return
        • Piston zone valves thermo-electric
        • Thermo-electric piston zone valves
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    • Sustainable comfort for HVAC systems
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Safety relief valves
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NF safety relief valves
See all products of

NF safety relief valves

311431

Safety relief valve.

313433

Safety relief valve.

512131

Safety relief valve.

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