Watts Regulators series 530C calibrated pressure relief valves are used in commercial, residential and industrial applications to protect against excessive pressure in systems containing water, oil, or air. It consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, stainless steel spring, brass bonnet, buna-N disc and buna-N O-Ring. Series 530C has a calibrated adjustment feature for setting the valve to the required relief pressure, and is ideal for by-pass thermal expansion pressure relief.

Valves are spring operated brass valves designed for use only as protection from the build up of excessive pressure in systems containing water, oil or air
• Incorporate a calibrated adjustment feature for setting the valve to the relief pressure required
• Adjustable stainless steel spring
• Buna-N disc on machined body seat
• Should not be used in system application
• Brass bonnet, spring washer and disc holder
  
  

  Watts Water B145-20

Watts Regulator series 100xL temperature and pressure relief valves are used in water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105000 BTU. They feature a bronze body with MNPT inlet and FNPT outlet connections, unique thermostat with special thermo-bonded coating, and a test lever.

Features a unique thermostat with special thermo-bonded coating
• Stainless steel spring
• Thermostat is accurate and proven and exclusively designed and manufactured by Watts
  
  

  Watts Water B147-3

Watts Regulators series 40L, 40xL automatic reseating temperature and pressure relief valves are used in commercial water heater applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters. They feature a bronze body with NPT male inlet and NPT female outlet connections, unique thermostat with special thermo-bonded coating, tamper-resistant bonnet screws, automatic reseating feature, and test lever. Model 40L has a short thermostat for installation directly in available tank tapings. Model 40xL has an extension thermostat for installation in the hot water outlet within the allowable distance from the top of the tank. Series 40L, 40xL valves are ASME rated and CSA listed.

Watts Water B147-4

Series LFP3 lead free multi-orifice flow control valves for tankless heaters are for use in commercial and residential hydronic heating systems to limit the flow of water to equipment in tankless heater installations. It has a multi-orifice cylinder design with solder connections that allow you to select a flow adjustment of 2 1/2, 3, 3 1/2, or 4 GPM by turning the cap to the desired setting.

Multi-orifice cylinder adjusts to 3, 3-1/2 or 4 GPM



B49-20

Watts Regulators series LF100xL temperature and pressure relief valves are used in water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105000 BTU. They feature a Lead Free copper alloy body with MNPT and FNPT outlet connections, unique thermostat with special thermo-bonded coating, and a test lever. The combined 2 in 1 temperature and pressure relief valve provides the least expensive and proven means for protection against both excessive temperature and pressure emergency conditions.

Unique thermostat with special thermo-bonded coating
• Stainless steel springs
• Thermostat is accurate and proven and exclusively designed and manufactured by Watts
• 8" length thermostat
  
  

  B147-3A

Watts Regulator series 374A boiler pressure relief valves are used in hot water boiler applications to protect against excessive pressure on all types of hot water heating boiler equipment. It consists of an iron body construction with forged bronze inlet connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. Series 374A resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and shall not be used as an operating control.

Iron body with forged brass inlet
• Seat located above drain, water cant be trapped and sediment cant foul seat
• Non-mechanical seat-to-disc alignment will not stick or freeze
• Each hot water space heating boiler shall be equipped with a pressure relief valve set to relieve below the maximum boiler working pressure
• Non-metallic disc-to-metal seating
• Bronze inlet wetted parts
  
  

  Watts Water B145-9A

Watts 9DM3 Forged Brass Dual Check Backflow Preventer with Intermediate Atmospheric Vent, 1/2", Female Union

It prevent the reverse flow of hot or cold polluted water from entering into the potable water supply
• It consists of a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves
• For continuous pressure, non-health hazard applications in smaller supply lines
• It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing
• A secondary check valve utilizes a rubber disc-to-metal seating
• In the event of fouling of the downstream check valve, leakage would be vented to atmosphere through the vent port thereby safeguarding the potable water system
• True line-sized construction allows the check modules to open further allowing dirt and debris to pass more freely reducing check fouling
• Maximum flow at low pressure drop
• Furnished with union connections to facilitate removal and replacement for maintenance
• Compact for economy combined with performance
• Design simplicity for easy maintenance
• Can be installed vertically or horizontally
  
  

  Watts Water B146-70

Watts Water 9DM2 Forged Brass Dual Check Backflow Preventer with Intermediate Atmospheric Vent, 3/4", Female Union

It prevent the reverse flow of hot or cold polluted water from entering into the potable water supply
• It consists of a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves
• For continuous pressure, non-health hazard applications in smaller supply lines
• It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing
• A secondary check valve utilizes a rubber disc-to-metal seating
• In the event of fouling of the downstream check valve, leakage would be vented to atmosphere through the vent port thereby safeguarding the potable water system
• True line-sized construction allows the check modules to open further allowing dirt and debris to pass more freely reducing check fouling
• Maximum flow at low pressure drop
• Furnished with union connections to facilitate removal and replacement for maintenance
• Compact for economy combined with performance
• Design simplicity for easy maintenance
• Can be installed vertically or horizontally
  
  

  Watts Water B146-71

Watts Regulator series 40L, 40xL automatic reseating temperature and pressure relief valves are used in commercial water heater applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters. They feature a bronze body with NPT male inlet and NPT female outlet connections, unique thermostat with special thermo-bonded coating, tamper-resistant bonnet screws, automatic reseating feature, and test lever. Model 40L has a short thermostat for installation directly in available tank tapings. Model 40xL has an extension thermostat for installation in the hot water outlet within the allowable distance from the top of the tank. Series 40L, 40xL valves are ASME rated and CSA listed.

The combined 2-in-1 temperature and pressure relief valve provides the least expensive and proven means for protection against both excessive temperature and pressure emergency conditions
• Fully automatic temperature and pressure relief protection for domestic hot water supply tanks and heaters
• Includes test lever and extension thermostat for installation in hot water outlet within the allowable distance from the top of the tank
• Non-mechanical seat-to-disc alignment
• Thermostat is accurate and proven and exclusively designed and manufactured by Watts
• Tamper-resistant bonnet screws
  
  

  Watts Water B147-103

Watts Regulators series 1450F dual controls regulator and relief Valve are for use in commercial and residential hydronic heating systems to fill the boiler and piping system with water, and to maintain water pressure in the system at all times. It also provides make-up water to the system in the event of system leaks. It consists of an iron and bronze body construction with NPT threaded inlet and outlet connections, an attached iron body, diaphragm relief valve, a tight seating check valve, purge lever for manual purging, and a stainless steel strainer. Series 1450F has high capacity performance and simplified servicing design. It is suitable for use in the boiler feed lines of hydronic heating systems.

Combination fill valve and safety pressure relief valve
• Tight seating check valve
• Purge lever for manual purging
• High capacity
• Stainless steel strainer to protect the valve disc from fouling
• 15 psi set and 30 psi relief valve setting
  
  

  Watts Water B144-1

Watts Regulators series 1450F dual controls regulator and relief Valve are for use in commercial and residential hydronic heating systems to fill the boiler and piping system with water, and to maintain water pressure in the system at all times. It also provides make-up water to the system in the event of system leaks. It consists of an iron and bronze body construction with NPT threaded inlet and outlet connections, an attached iron body, diaphragm relief valve, a tight seating check valve, purge lever for manual purging, and a stainless steel strainer. Series 1450F has high capacity performance and simplified servicing design. It is suitable for use in the boiler feed lines of hydronic heating systems.

Combination fill valve and safety pressure relief valve
• Tight seating check valve
• Purge lever for manual purging
• High capacity
• Stainless steel strainer to protect the valve disc from fouling
• 100 psi working , 15 psi set and 30 psi relief valve setting
  
  

  B144-2

Watts Regulators series 740 boiler pressure relief valves are used in hot water space heating boiler applications to protect against excessive pressure on all types of hot water space heating boiler equipment. It consists of a iron body construction with expanded outlet drain connections for hot water space heating boilers, non-metallic disc-to-metal seating, stainless steel spring, and test lever. Series 740 offers large discharge capacity, resists corrosive water conditions, resists sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and shall not be used as an operating control.

Iron body with expanded outlets for hot water space heating boilers
• Seat located above drain, water can't be trapped and sediment can't foul seat
• Non-mechanical seat-to-disc alignment will not stick or freeze
• Water seal of high temperature resisting material isolates spring working parts from water during relief
  
  

  Watts Water B145-5