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

Sid Harvey Item #:B145-9A: Replaces Part #:'s : B145-9A,

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Watts Water B145-9A

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 not ASME approved. Model 530FP is for use in fire protection systems.

• Calibrated adjustment feature for setting valve to relief pressure required
• Stainless steel spring
• Brass bonnet, disc holder and spring washer

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B145-21

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
• Each hot water space heating boiler shall be equipped with a pressure relief valve set to relieve below the maximum boiler working pressure
• Water seal of high temperature resisting material isolates spring working parts from water during relief

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740-3/4-50

Watts Water 1156F-P Reducing Valve 1/2" FPT,
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1156F-P

Watts Water LF25AUB-Z3 Reducing Valve 1" x 1" FPT x FPT Bronze,
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LF25AUB-Z3

Watts Water 0556035 Relief Valve 1/2" NPT 50-175 Lbs.

0556035

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

Sid Harvey Item #:B147-3: Replaces Part #:'s : B147-3A,
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Watts Water B147-3

Watts Regulator ETX-30 Steel Residential Closed Hot Water Heating Expansion Tank 4.5 Gallon

ETX-30

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

Sid Harvey Item #:B49-20: Replaces Part #:'s : 2K565,
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Watts Water 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

Sid Harvey Item #:B147-3A: Replaces Part #:'s : B147-3,
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Watts Water B147-3A