Watts Datasheets for Pressure Relief Valves

Pressure relief valves are self-actuated safety valves designed to relieve excess pressure upstream from the line.
Pressure Relief Valves: Learn more

Product Name Notes
Ductile Iron Rate-of-Flow Control Valve with Pressure Reducing Feature -- LF951GD
Stainless Steel Rate-of-Flow Control Valve with Pressure Reducing Feature -- 951GS
Designed to automatically limit flow rate to a constant, adjustable, maximum by sensing differential pressure across a remote mounted orifice plate (field installed), and reduce a fluctuating higher upstream pressure...
Ductile Iron Pressure Reducing Control Valve with Downstream Surge Control Feature -- LF910GD-11
Stainless Steel Pressure Reducing Control Valve with Downstream Surge Control Feature -- 910GS-11
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rate, and quickly modulate toward closed when sudden high pressure downstream...
Ductile Iron Pressure Reducing Control Valve with Hydraulic Check Feature -- LF910GD-01
Stainless Steel Pressure Reducing Control Valve with Hydraulic Check Feature -- 910GS-01
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, and close drip-tight when downstream pressure becomes greater than upstream...
Ductile Iron Pressure Reducing Control Valve with Return Flow Feature -- LF910GD-17
Stainless Steel Pressure Reducing Control Valve with Return Flow Feature -- 910GS-17
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, and open for return flow when downstream pressure exceeds inlet...
Ductile Iron Pressure Reducing and Sustaining Control Valve -- LF912GD
Stainless Steel Pressure Reducing and Sustaining Control Valve -- 912GS
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, and throttle to sustain a minimum upstream pressure.
Ductile Iron Pressure Reducing and Sustaining Control Valve with Hydraulic Check Feature -- 912GD-01
Stainless Steel Pressure Reducing and Sustaining Control Valve with Hydraulic Check Feature -- 912GS-01
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, throttle to sustain a minimum upstream pressure, and close drip-tight...
Ductile Iron Pressure Reducing and Sustaining Control Valve with Downstream Surge Control Feature -- LF912GD-11
Stainless Steel Pressure Reducing and Sustaining Control Valve with Downstream Surge Control Feature -- 912GS-11
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, throttle to sustain a minimum upstream pressure, and quickly modulate...
Ductile Iron Pressure Reducing Control Valve with Low Flow By-Pass Feature -- LF910GD-48
Stainless Steel Pressure Reducing Control Valve with Low Flow By-Pass Feature -- 910GS-48
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates. Flow requirements below the range of the main line Pressure...
Ductile Iron Pressure Reducing Control Valve with Solenoid (On-Off) Feature -- LF910GD-15
Stainless Steel Pressure Reducing Control Valve with Solenoid (On-Off) Feature -- 910GS-15
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates. The valve also acts as a Solenoid (On-Off) Control Valve.
Ductile Iron Pressure Reducing Control Valve -- LF910GD
Stainless Steel Pressure Reducing Control Valve -- 910GS
Designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates.
Ductile Iron Pressure Relief and Surge Anticipator Control Valve -- LF925GD
Stainless Steel Pressure Relief and Surge Anticipator Control Valve -- 925GS
Designed to minimize the effects of water hammer and pressure surges resulting from: 1) Normal pump starting and stopping operations or 2) Mechanical or electrical power failure situations. The valve...
Ductile Iron Single Chamber Pump Control Valve with Pressure Reducing Feature -- 981GD
Stainless Steel Single Chamber Pump Control Valve with Pressure Reducing Feature -- 981GS
Designed to minimize the surges associated with the starting and stopping of pumps, and automatically reduce pump outlet pressure to a constant lower downstream pressure regardless of varying flow rates.
Ductile Iron Dual Chamber Deep Well Pump Control Valve with Pressure Relief Feature -- 985GD-20
Stainless Steel Dual Chamber Deep Well Pump Control Valve with Pressure Relief Feature -- 985GS-20
Designed to minimize the surges associated with the starting and stopping of well pumps, and open to relieve excessive pressure during the pumping cycle. The valve closes at an adjustable...
Ductile Iron Pressure Relief, Sustaining or Backpressure Control Valve -- LF920GD
Stainless Steel Pressure Relief, Sustaining or Backpressure Control Valve -- 920GS
Designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and throttle when upstream pressure falls below the adjustable setpoint. When installed "off the...
Temporary By-pass for Water Pressure Reducing Valve -- Jumper Kits Jumper Kits are used in new construction as a temporary by-pass, prior to the actual installation of a water pressure reducing valve on potable water supply systems. The use of...
Lead Free* Boiler Pressure Relief Valve -- LF174A Lead Free* cast copper silicon alloy body safety relief valves for pressure protection only of all types of hot water heating boiler equipment. Pressure range 50 to 150psi (3 -...
Pressure Reducing Control Valve with Low-Flow By-Pass -- LF6115-74JM Model 6115-74JM Pressure Reducing Control Valve with Low-Flow By-Pass is constructed the same as 6115-JM with addition of a full 3/4 in. Low-Flow By-Pass, expanding the flow range.
Pressure Reducing and Downstream Surge Control Valve -- LF6115-7JM Model 6115-7JM Pressure Reducing and Downstream Surge Control Valve is constructed same as the 6115-JM with additional downstream surge control pilot. The added surge control pilot ensures positive pressure control...
Pressure Reducing Control Valve -- LF6115-JM Model 6115-JM Pressure Reducing Control Valve is designed to reduce a higher, fluctuating inlet pressure to a constant, lower, outlet pressure.
Lead Free* Temperature and Pressure Relief Valve -- LF10L Model LF10L 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...
Drain Tubes for Side-Mounted T&P Relief Valve -- 100DT Series 100DT Drain Tubes for T&P Relief Valves are used on gas, electric, or oil fired residential water heaters to safely drain water discharged from the heater's temperature and pressure...
Drain Tubes for Top Mounted T&P Relief Valve -- 100DT-A60 Series 100DT-A60 Drain Tubes for T&P Relief Valves are used on gas, electric, or oil fired residential water heaters to safely drain water discharged from the heater's temperature and pressure...
Temperature and Pressure Relief Valve -- 100XL 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...
Automatic Reseating Temperature and Pressure Relief Valve -- 140S, 140X Series 140S, 140X Automatic Reseating Temperature and Pressure Relief Valves are used in commercial water heater applications to provide automatic temperature and pressure protection to domestic hot water supply tanks...
Dual Controls (Regulator and Relief Valve) -- 1450F 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...
Boiler Pressure Relief Valve -- 174A Series 174A Boiler Pressure Relief Valves are used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply...
Temperature and Pressure Relief Valve -- 1L, 1XL Series 1L, 1XL 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...
Direct Operated Water Pressure Reducing Valve -- 2300 Series 2300 Direct Operated Water Pressure Reducing Valves are used in commercial and industrial applications to regulate the flow of water to dead-end services where the flow is intermittent and...
Steam Safety Relief Valve, ASME Section IV -- 315-M Series 315-M2 Steam Safety Relief Valves are used in commercial and industrial applications for low-pressure, steam heating boilers and process equipment. It consists of a bronze body construction with NPT...
Automatic Reseating Temperature and Pressure Relief Valve -- 340, 340X Series 340, 340X 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...
Automatic Reseating Temperature and Pressure Relief Valve -- 342, 342X Series 342, 342X Automatic Reseating Temperature and Pressure Relief Valves are used in commercial water heater applications to provide automatic temperature and pressure protection to domestic hot water supply tanks...
Boiler Pressure Relief Valve -- 374A 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...
Pressure Relief Valve with Test Lever -- 3L Series 3L Pressure Relief Valves are used in residential applications to protect against excessive pressure on domestic storage tanks, tankless water heaters, and solar heating applications. It consists of a...
Automatic Reseating Temperature and Pressure Relief Valve -- 40L, 40XL 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...
Steam Safety Relief Valve, ASME Section IV -- 415 Series 415 Steam Safety Relief Valves are used in commercial and industrial applications for low-pressure, steam heating boilers and process equipment. It consists of a brass body (size 1/4 in.),...
Pressure Relief Valve -- 53 Series 53 Pressure Relief Valves are used in residential applications to protect against excessive pressure on domestic storage tanks and tankless water heaters. It consists of a bronze body construction...
By-Pass Control Relief Valve -- 5300A Series 5300A By-Pass Control Relief Valves are used in commercial, residential and industrial applications to regulate liquid pressure as supplied by a positive pressure pump. It is a poppet-type compact...
Calibrated Pressure Relief Valve -- 530C 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...
Pressure Relief Valve with Test Lever -- 53L Series 53L Pressure Relief Valves are used in residential applications to protect against excessive pressure on domestic storage tanks and tankless water heaters. It consists of a bronze body construction...
Boiler Pressure Relief Valve -- 740 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.
Hose Connection Vacuum Breakers with Freeze Relief Feature, Brass -- 8FR Series 8FR Hose Connection Vacuum Breakers permit the attachment of portable hoses to hose thread faucets and prevent the reverse flow of polluted water from entering into the potable water...
By-Pass Control Relief Valve -- BP30 Series BP30 By-Pass Control Relief Valves are used in commercial, residential and industrial applications to regulate liquid pressure as supplied by a positive pressure pump. It is a diaphragm-operated type...
Steam Safety Relief Valve, ASME Section I -- Figure 31 Series Figure 31 Steam Safety Relief Valves are ASME section I valves used on steam boilers with operating pressures from 5 to 250psi (.34 to 17.2 bar). Series Figure 31...
Steam Safety Relief Valve, ASME Section VIII -- Figure 41 Series Figure 41 Steam Safety Relief Valves are ASME section VIII valves used for over-pressure protection of unfired pressure vessels, steam pressure reducing valve stations, and other steam service equipment...
Safety Relief Valve for Air, Gas, and Vapors, ASME Section VIII -- Figure 41A Series Figure 41A Safety Relief Valves for Air, Gas, and Vapors are ASME section VIII valves used for compressors, intercoolers, aftercoolers and receivers, air makeup units, gas burners, pneumatic conveying/elevating...
Pressure Relief Valve for Fire Protection Applications with Test Lever -- FP53L Series FP53L Pressure Relief Valves for Fire Protection Applications are designed for use in fire protection grid systems to provide protection against excessive water pressure caused by thermal expansion or...
Lead Free* Temperature and Pressure Relief Valve -- LF100XL 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...
Lead Free* Low Water Pressure Reducing Valve -- LF123LP Series LF123LP Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series is suitable...
Lead Free* High Capacity Water Pressure Reducing Valve -- LF127W Series LF127W High Capacity Water Pressure Reducing Valves are used in commercial and industrial applications to reduce incoming water pressure for protection of plumbing system components and to reduce water...
Lead Free* Automatic Re-seating Temperature and Pressure Relief Valve -- LF140 Series LF140L 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...
Lead Free* Temperature and Pressure Relief Valve -- LF1L, LF1XL Series LF1L, LF1XL 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...
Lead Free* High Capacity Water Pressure Reducing Valve -- LF223, LF223S Series LF223, LF223S Lead Free* High Capacity Water Pressure Reducing Valves are used in commercial, industrial, and institutional applications to reduce incoming water pressure for protection of plumbing system components...
Lead Free* Water Pressure Reducing Valve -- LF25AUB-Z3 Series LF25AUB-Z3 Lead Free* Water Pressure Reducing Valves are used in commercial and residential applications to reduce incoming water pressure for protection of plumbing system components and to reduce water...
Lead Free Automatic Re-seating Temperature and Pressure Relief Valve -- LF340, LF340X Series LF340, LF340X 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...
Lead Free* Poppet Type Pressure Relief Valve for Protection Against Excessive Pressure -- LF53L
Lead Free*Poppet Type Pressure Relief Valve for Protection Against Excessive Pressure -- LF3L
Series LF3L and LF53L are used for protection against excessive pressure on domestic storage tanks or tankless water heaters. Similar in construction to Watts Model LF10L, the Model LF3L has...
Lead Free* Automatic Re-seating Temperature and Pressure Relief Valve -- LF40L, LF40XL Series LF40L, LF40XL 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...
Lead Free* Poppet Type Pressure Relief Valve for Protection Against Excessive Pressure -- LF4L Series LF4L is used to protect against excessive pressure in tankless water heaters. Similar in construction to Watts Model LF3L, the LF4L has no temperature relieving element. Series LF4L is...
Lead Free* non-Calibrated Pressure Relief Valve -- LF53 Series LF53 Lead Free* ressure Relief Valves are spring operated Lead Free* brass relief valves designed to be used only as protection from the build up of excessive pressure in...
Lead Free* Calibrated Pressure Relief Valve -- LF530C Series LF530C Lead Free* 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...
Lead Free* Diaphragm Operated Bypass Control Relief Valve -- LFBP30 Series LFBP30 Lead Free* Diaphragm Operated Bypass Relief Valves regulate liquid pressure as supplied by a positive pressure pump. These relief valves protect equipment by opening at desired setting and...
Combination Ball Valve and Relief Valve -- LFBRVM1 Series LFBRVM1, Combination Ball Valve and Relief Valve is an easy to install two-in-one device. Designed to be used as water heater shutoff valves to provide both a means to...
Lead Free* Flanged High Capacity Water Pressure Reducing Valve -- LFF127W Series LFF127W Flanged High Capacity Water Pressure Reducing Valves are used in commercial and industrial applications to reduce incoming water pressure for protection of plumbing system components and to reduce...
Lead Free* Extended Shank Automatic Re-seating Temperature and Pressure Relief Valve -- LFLL40XL, LFLLL40XL Series LFLL40XL, LFLLL40XL Extended Shank 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...
Lead Free* High Capacity Water Pressure Reducing Valve -- LFN223B, LFN223BS Series LFN223B, LFN223BS Lead Free* High Capacity Water Pressure Reducing Valves are used in commercial, industrial, and institutional applications to reduce incoming water pressure for protection of plumbing system components...
Flanged Super Capacity, Lead Free* Water Pressure Reducing Valve -- LFN223F Series LFN223F and LFN223FS Super Capacity Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption.
Lead Free* Automatic Re-seating Temperature and Pressure Relief Valve -- LFN240X Series LFN240X 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...
Lead Free* Water Pressure Reducing Valve -- LFN250 Series LFN250 Iron Body Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series...
Lead Free* Water Service Vacuum Relief Valve -- LFN36 Series LFN36 Lead Free* Water Service Vacuum Relief Valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions that...
Lead Free* Water Pressure Reducing Valve -- LFN45B
Lead Free* Water Pressure Reducing Valve -- LFN45B-L
Series LFN45B Lead Free* Water Pressure Reducing Valves are used in commercial and residential applications to reduce incoming water pressure for protection of plumbing system components and to reduce water...
Lead Free* Water Pressure Reducing Valve -- LFN45B-EZ Series LFN45B-EZ Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series is suitable...
Lead Free* Water Pressure Reducing Valve -- LFN55B Series LFN55B Lead Free* Water Pressure Reducing Valves are used in commercial and residential applications to reduce incoming water pressure for protection of plumbing system components and to reduce water...
Lead Free* Water Pressure Reducing Valve -- LFN55B-M1 Series LFN55B Water Pressure Reducing Valves are used in commercial and residential applications to reduce incoming water pressure for protection of plumbing system components and to reduce water consumption. It...
Lead Free* Water Pressure Reducing Valve -- LFRC105 Series LFRC105 Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. The LFRC105 features Lead...
Lead Free* High Performance Water Pressure Reducing Valve -- LFU5B-Z3 Series LFU5B-Z3 Lead Free* High Performance Water Pressure Reducing Valves are used in commercial, industrial, and residential applications to reduce incoming water pressure for protection of plumbing system components and...
Lead Free* Cartridge Style Water Pressure Reducing Valve -- LFX65B Series LFX65B Lead Free* Water Pressure Reducing Valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. The LFX65B...
Extended Shank Automatic Reseating Temperature and Pressure Relief Valve -- LL40XL, LLL40XL Series LL40XL, LLL40XL Extended Shank 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...
Automatic Reseating Temperature and Pressure Relief Valve -- N240X, N241X Series N240X, N241X Automatic Reseating Temperature and Pressure Relief Valves are used in commercial water heater applications to provide automatic temperature and pressure protection to domestic hot water supply tanks...
Pressure Relief Valve for Well Systems -- N30 Series N30 Pressure Relief Valves for Wells are used to protect against excessive pressures in well systems. It is not diaphragm actuated and is used for pressure-relief service only. Series...
Water Service Vacuum Relief Valve -- N36 Series N36 Water Service Vacuum Relief Valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions that could siphon...
Extended Shank Temperature and Pressure Relief Valve -- SL100XL, L100XL, LL100XL and LLL100XL Series SL100XL, L100XL, LL100XL and LLL100XL Extended Shank Temperature and Pressure Relief Valves are used in water heater and hot water storage tank applications to provide automatic temperature and pressure...
Fire System Pressure Reducing Valve -- 910AF / 910GF The Ames 910GF (Globe) and 910AF (Angle) Pressure Reducing Valves meet all requirements for UL listed fire protection service. Automatically reduces a higher inlet pressure to an adjustable lower outlet...
Fire Pump Relief Valve -- 920A-UL / 920G-UL The Ames ACV 920A-UL (Angle) Relief Valve meets all requirements for UL listed, FM Approved fire protection service. The design and features incorporated in the Ames ACV valves assure accurate...
Fire Pump Relief Valve -- 920GF / 920AF The Ames ACV 920GF (Globe) and 920AF (Angle) Relief Valve meets all requirements for UL listed, FM Approved fire protection service. The design and features incorporated in the Ames ACV...
Pressure Reducing Pilot -- 263RS The Model 263RS is a remote sensed, direct acting, diaphragm actuated Pilot that is used on various configurations of Automatic Control Valves. It is normally held open by the force...
Pressure Reducing Pilot -- 263SS The Model 263SS is a direct acting, diaphragm actuated Pilot that automatically reduces a higher upstream (inlet) pressure to a constant downstream (outlet) pressure. It is normally held open by...
Pressure Reducing Pilot -- CP15-1SS The Model CP15-1SS is a remote sensed, direct acting, diaphragm actuated Pilot that is used on various configurations of Automatic Control Valves. It is normally held open by the force...
Pressure Reducing Pilot -- CP15SS The Model CP15SS is a direct acting, diaphragm actuated Pilot that automatically reduces a higher upstream (inlet) pressure to a constant downstream (outlet) pressure. It is normally held open by...
Pressure Reducing Pilot -- LF263AP The Model LF263AP is a direct acting, diaphragm actuated control pilot that automatically reduces a higher upstream (inlet) pressure to a constant downstream (outlet) pressure. It is normally held open...
Pressure Reducing Pilot -- LFCP15 The Model LFCP-15 is a direct acting, diaphragm actuated Pilot that automatically reduces a higher upstream (inlet) pressure to a constant downstream (outlet) pressure. It is normally held open by...
Pressure Relief, Sustaining or Backpressure Pilot -- LFPV20C The Model LFPV20C is a remote sensed direct acting, diaphragm actuated Pilot that is used on various configurations of Automatic Control Valves. It is normally held closed by the force...
Pressure Relief Pilot -- LFPV20CB The Model LFPV20CB is a direct sensed direct acting, diaphragm actuated Pressure Relief pilot. It is normally held closed by the force of the adjustable spring setting above the diaphragm.
Pressure Relief, Sustaining or Backpressure Pilot -- SSPV20C The Model SSPV20C is a remote sensed direct acting, diaphragm actuated Pilot that is used on various configurations of Automatic Control Valves. It is normally held closed by the force...
Pressure Relief, Sustaining or Backpressure Pilot -- SSPV20DP The Model SSPV20DP is a remote sensed, diaphragm actuated Pilot that is used for maintaining a constant differential. It is normally held closed by the force of the adjustable spring...
Fire Pump Relief Valve - Globe Pattern -- 116FM The WATTS ACV 116FM (Globe) Relief Valve meets all requirements for UL listed, FM Approved fire protection service. The design and features incorporated in the WATTS ACV Valves assure accurate...
Pressure Reducing with Hydraulic Check - Reduced Port -- LFM6115-3, LFM61115-3 The Watts ACV Combination Pressure Reducing and Check Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure, and close drip-tight when downstream...
Pressure Reducing with Downstream Surge Control - Reduced Port -- LFM6115-7, LFM61115-7 The Watts ACV Combination Pressure Reducing and Surge Control Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure, and will quickly modulate...
Pressure Relief and Surge Anticipator -- LFM116-52, LFM1116-52
Pressure Relief and Surge Anticipator -- S116-52, S1116-52
Pressure Relief and Surge Anticipator Control Valve -- LFF116-52, LFF1116-52
The WATTS ACV Combination Surge Anticipator and Pressure Relief Control Valve is designed to minimize the effects of water hammer and pressure surges resulting from: 1) Normal pump starting and...
Dual Chamber Deep Well with Pressure Relief -- LFM513-14, LFM1513-14
Dual Chamber Deep Well with Pressure Relief -- S513-14, S1513-14
The Watts ACV Deep Well Pump Control Valve with Pressure Relief Feature is designed to minimize the surges associated with the starting and stopping of well pumps, and open, relieving...
Pressure Reducing with Hydraulic Check - Full Port -- LFM115-3, LFM1115-3
Pressure Reducing with Hydraulic Check -- LFF115-3, LFF1115-3
Pressure Reducing with Hydraulic Check -- S115-3, S1115-3
The WATTS ACV Pressure Reducing and Check Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates, and...
Pressure Reducing with Downstream Surge Control - Full Port -- LFM115-7, LFM1115-7
Pressure Reducing with Downstream Surge Control -- LFF115-7, LFF1115-7
Pressure Reducing with Downstream Surge Control -- S115-7, S1115-7
The WATTS ACV Pressure Reducing and Downstream Surge Control Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow...
Pressure Reducing with Solenoid (On-Off) - Full Port -- LFM115-4, LFM1115-4
Pressure Reducing with Solenoid (On-Off) -- LFF115-4, LFF1115-4
Pressure Reducing with Solenoid (On-Off) -- S115-4, S1115-4
The WATTS ACV Pressure Reducing and Solenoid (On-Off) Control Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow...
Pressure Reducing and Sustaining -- LFF115-2, LFF1115-2
Pressure Reducing and Sustaining -- S115-2, S1115-2
Pressure Reducing and Sustaining Control Valve - Full Port -- LFM115-2, LFM1115-2
The WATTS ACV Pressure Reducing and Sustaining Control Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates,...
Pressure Reducing and Sustaining with Downstream Surge Control - Full Port -- LFM115-43, LFM1115-43
Pressure Reducing and Sustaining with Downstream Surge Control -- LFF115-43, LFF1115-43
Pressure Reducing and Sustaining with Downstream Surge Control -- S115-43,S1115-43
The WATTS ACV Pressure Reducing and Sustaining Control Valve with Downstream Surge Control Feature is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure...
Pressure Reducing and Sustaining with Hydraulic Check - Full Port -- LFM115-11, LFM1115-11
Pressure Reducing and Sustaining with Hydraulic Check -- S115-11, S1115-11
Pressure Reducing and Sustaining with Hydraulic Check -- T214603
Pressure Reducing and Sustaining with Hydraulic Check -- T214903
The WATTS ACV Pressure Reducing and Sustaining Control Valve with Hydraulic Check Feature is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless...
Pressure Reducing Control Valve - Full Port -- LFM115, LFM1115
Pressure Reducing Control Valve - Reduced Port -- LFM6115, LFM61115
Pressure Reducing Control Valve -- LFF115, LFF1115
Pressure Reducing Control Valve -- S115, S1115
The WATTS ACV Pressure Reducing Control Valve is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates.
Pressure Reducing with Low Flow By-Pass - Full Port -- 8711-13
Pressure Reducing with Low Flow By-Pass - Reduced Port -- LFM6115-74, LFM61115-74
Pressure Reducing with Low Flow By-Pass -- LFF115-74, LFF1115-74
Pressure Reducing with Low Flow By-Pass -- S115-74, S1115-74
The WATTS ACV Pressure Reducing Control Valve with Low Flow By-Pass is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying...
Pressure Reducing with Return Flow Feature - Full Port -- LFM115-58, LFM1115-58
Pressure Reducing with Return Flow Feature -- LFF115-58, LFF1115-58
Pressure Reducing with Return Flow Feature -- S115-58, S1115-58
The WATTS ACV Pressure Reducing Control Valve with Return Flow Feature is designed to automatically reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying...
Pressure Relief, Sustaining or Backpressure -- LFM116, LFM1116
Pressure Relief, Sustaining or Backpressure -- S116, S1116
Pressure Relief, Sustaining or Backpressure Control Valve -- LFF116, LFF1116
The WATTS ACV Pressure Relief, Sustaining or Backpressure Control Valve is designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and throttle toward...
Single Chamber with Pressure Reducing -- LFF113-29, LFF1113-29
Single Chamber with Pressure Reducing -- LFM113-29, LFM1113-29
Single Chamber with Pressure Reducing -- S113-29, S1113-29
The WATTS ACV Pump Control Valve with Pressure Reducing Feature is designed to minimize the surges associated with the starting and stopping of pumps, and automatically reduce pump outlet pressure...
Rate-of-Flow Control Valve with Pressure Reducing -- LFF114-2, LFF1114-2
Rate-of-Flow Control Valve with Pressure Reducing -- LFM114-2, LFM1114-2
Rate-of-Flow Control Valve with Pressure Reducing -- S114-2, S1114-2
The WATTS ACV Rate of Flow Control Valve with Pressure Reducing Feature is designed to automatically limit flow rate to a constant, adjustable, maximum, and reduce a fluctuating higher upstream...
Fire System Pressure Reducing Valve -- M115F, M1115F The Watts M115F (Globe) and M1115F (Angle) Pressure Reducing Valves meet all requirements for UL listed fire protection service. Automatically reduces a higher inlet pressure to an adjustable lower outlet...
Fire Pump Relief Valve -- M116FM, M1116FM The WATTS M116FM (Globe) and M1116FM (Angle) Relief Valve meets all requirements for UL listed, FM Approved fire protection service. Automatically maintains a constant pressure in the fire protection system...