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Series: N36
Description: Water Service Vacuum Relief Valves
Size Range: 1/2, 3/4 in. (15, 20mm)
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 the water from the system and
damage water heater/tank equipment. It consists of a brass body construction
with NPT male inlet connection, and a protective cap. Series N36 has a low
profile design, is tested and rated to ANSI Z21.22, and is CSA certified. It
is suitable for low pressure steam and water service, and is ideal for use in
domestic water heaters and supply tanks, table top heaters, jacketed steam
kettles, unit heaters, low pressure steam systems, and steam coil heaters.
Maximum Working Pressure: 200psi (14 bar), Maximum Steam Pressure: 15psi
(103.4 kPa).
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Series: 315-M1
Description: Steam Safety Relief Valves
Size Range: 3/4 x 3/4 in. (20x20mm)
Series 315-M1 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 threaded male
inlet and threaded female outlet (drain) connection, stainless steel spring,
a top-guided stem, and a non-stick Teflon disc-to-metal seating. Model 315SC
has satin chrome finish. Model 315L has low pressure setting at 8psi (55 kPa)
for pressure cookers and steam cleaning equipment. ASME section IV at 15psi
(103 kPa) set point.
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Series: 415
Description: Steam Safety Relief Valves
Size Range: 3/4 to 1 1/2 in. (20 to 40mm)
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.), or a bronze body (sizes 1, 1 1/4,
1 1/2 in.) construction with NPT threaded male inlet and threaded female
outlet (drain) connection, stainless steel spring, a top-guided stem, and a
non-stick Teflon disc-to-metal seating. Model 415SC has satin chrome finish.
Model 415L has low pressure setting at 8psi (55kPa) for pressure cookers and
steam cleaning equipment. ASME section IV at 15psi (103.4 kPa) set point.
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Series: Figure 31
Description: Steam Safety Relief Valves
Size Range: 1/2 x 3/4 to 6 x 8 in. (15 x 20 to 150 x 200mm)
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 is a high capacity safety relief valve with a top guide and
full nozzle. It consists of a bronze body (sizes 1/2 to 2 1/2 in.) with NPT
threaded male inlet and threaded female outlet (drain) connections, or a cast
iron body (sizes 1 1/2 to 6 in.) construction with flanged connections. ASME,
Section I rated.
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Series: Figure 41
Description: Steam Safety Relief Valves
Size Range: 1/2 x 3/4 to 6 x 8 in. (15 x 20 to 150 x 200mm)
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 with operating
pressures from 5 to 250psi (.34 to 17.2 bar). Series Figure 41 is a high
capacity safety relief valve with a top guide and full nozzle. It consists of
a bronze body (sizes 1/2 to 2 1/2 in.) with NPT threaded male inlet and
threaded female outlet (drain) connections, or a cast iron body (sizes 1 1/2
to 6 in.) construction with flanged connections. ASME, Section VIII rated.
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Series: Figure 41A
Size Range: 1/2 x 3/4 to 6 x 8 in. (15 x 20 to 150 x 200mm)
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
equipment, dryers and other pressure vessels and piping, that handle air,
gases, and vapors to 250psi. Series Figure 41A is a high capacity safety
relief valve with a top guide and full nozzle. It consists of a bronze body
(sizes 1/2 to 2 1/2 in.) with NPT threaded male inlet and threaded female outlet
(drain) connections, or a cast iron body (sizes 1 1/2 to 6 in.) with flanged
connections. ASME Section VIII rated.
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Series: 210-5
Description: Automatic Gas Shutoff Valves
Size Range: 3/4 in. (20mm)
Series 210-5 Automatic Gas Shutoff Valves are used in gas water heater
applications to protect against overheating water in the domestic hot water
supply heating system. It is an immersion-type valve that automatically shuts
off the gas supply to the heater if the temperature reaches 210°lF (99°C). It
is a self-contained device that consists of Buna-N disc-to-metal seating,
manual reset button to reopen the valve after an automatic shutoff, trip
latch assembly and stainless steel spring seats to close the valve at a
controlled temperature, and thermostat with extension tube which operates
trip latch in response to water temperature. Design certified by CSA. Models
L210-5 M2, LL210-5 M2 and LLL210-5 M2 feature extended shanks for use with
water heaters containing extra thick insulation, up to 3 in.
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Series: BP30
Description: By-Pass Control Relief Valves
Size Range: 1/2 in. (15mm)
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 valve that protects
equipment by opening at the desired setting to allow excess volume to be
by-passed back to the source. Series BP30 consists of a bronze body
construction with NPT threaded male inlet and NPT threaded female outlet,
sensitive rubber diaphragm, Teflon disc, spring and adjustment handle, and a
tee handle. Models available in various pressure ranges.
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Series: 5300A
Description: By-Pass Control Relief Valves
Size Range: 1/2 in. (15mm)
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 valve that
protects equipment by opening at the desired setting to allow excess volume
to be by-passed back to the source. Series 5300A consists of a bronze body
construction with NPT threaded male inlet and NPT threaded female outlet,
sensitive rubber diaphragm, Teflon disc, spring and adjustment handle, and a
tee handle. Pressure Range: 0 to 250psi (0 to 17.23 bar).
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Series: BRV
Description: Combination Ball Valve and Relief Valves
Size Range: 3/4 to 1 in. (20 to 25mm)
Series BRV Combination Ball Valve and Relief Valves are used in commercial
and residential applications on water heater installations. It consists of a
bronze body construction with a full port (reduced port with PEX connection),
nickel-plated brass ball, blowout-proof brass stem, PTFE seats, stem packing,
and stem thrust bearing, Viton relief ball, stainless steel relief spring,
brass adapter, and steel handle (the relief valve outlet includes a drain
tube connection with PEX or compression fitting models). Series BRV has a low
profile design and can be installed in any position. It is for applications
that require a means to shut off the water supply to the water heater and for
providing protection from excess water pressure caused by thermal expansion.
Pressure Rated: 400psi. Relief Valve Pressure Settings: 75, 80, 100 or 125psi
(5.2, 5.5, 6.9 or 8.6 bar).
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Series: 3L
Description: Pressure Relief Valves
Size Range: 1/2 , 3/4 in. (15, 20mm)
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 bronze body
construction with NPT threaded male inlet and NPT threaded female (drain)
outlet connections, stainless steel spring, and test lever. Model 3L-Z9 has a
stainless steel lever and pin for outside solar applications. ANSI Z21.22 approved,
ASME rate, and design certified and listed by CSA. Can be used with Watts
Series 210 gas shutoff valve. Pressure Range: 75 to 150psi (5.27 to 10.34
bar), Standard Pressure Settings: 75, 100, 125, and 150psi (5.17, 6.90, 8.61,
and 10.34 bar).
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Series: 30L
Description: Pressure Relief Valves for Well Systems
Size Range: 1/2 in. (15mm)
Series 30L 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 30L consists of a bronze body
construction with NPT threaded male inlet and NPT threaded female (drain)
outlet connections, stainless steel spring, and test lever. Standard Pressure
Setting: 75psi (5.17 bar), Optional Settings: 100, 125, and 150psi (6.9, 8.6,
and 10.3 bar).
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Series: N30
Description: Pressure Relief Valves for Well Systems
Size Range: 1/2 in. (15mm)
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 N30 consists of a bronze body
construction with NPT threaded male inlet and NPT threaded female (drain)
outlet connections, and stainless steel spring. Pressure Range: 5 to 25psi
(34.5 to 172.4 kPa). Model N30L has a test lever and a pressure range of 30
to 60psi (206.7 to 413.4 kPa) and a standard pressure setting of 30 to 45psi
(206.7 to 310 kPa).
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Series: H32
Description: Pressure Relief Valves with Hose Connection
Size Range: 1/2 to 3/4 in. (15 to 20mm)
Series H32 Pressure Relief Valves with Hose Connection are used in
residential applications to protect against excessive pressures in piping
systems. It connects to the outside hose bibb and consists of a bronze body
construction with 3/4 in. hose inlet connection. Pressure Rating: 80psi or
100psi (5.5 bar or 6.89 bar).
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Series: 53
Description: Pressure Relief Valves
Size Range: 1/2, 3/4 in. (15 to 20mm)
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 with NPT threaded
male inlet and NPT threaded female (drain) outlet connections, and stainless
steel spring. ANSI Z21.22 approved, ASME rated, and design certified and
listed by CSA. Pressure Range: 75 to 175psi (5.2 to 12.1 bar), Standard Pressure
Setting: 75psi (516.7 kPa), Optional Settings: 100, 125, and 150psi (6.9,
8.6, and 10.3 bar); Also available at 50psi (3.45 bar) setting.
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Series: 53L
Description: Pressure Relief Valves
Size Range: 1/2 in. (15mm)
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 with NPT threaded
male inlet and NPT threaded female (drain) outlet connections, stainless
steel spring, and test lever. ANSI Z21.22 approved, design certified and
listed by CSA, and UL listed. Pressure Range: 75 to 175psi (5.2 to 12.1 bar),
Standard Pressure Setting: 75psi (516.7 kPa), Optional Settings: 100, 125,
and 150psi (6.9, 8.6, and 10.3 bar); Also available at 50psi (3.45 bar)
setting.
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Series: FP53L
Description: Pressure Relief Valves for Fire Protection Applications
Size Range: 1/2 in. (15mm)
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 line surge.
It consists of a bronze body construction with NPT threaded male inlet and
NPT threaded female (drain) outlet connections, stainless steel spring, and
test lever. Series FP53L is UL listed and has a standard 175psi (12.25 bar)
pressure relief setting.
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Series: 174A
Description: Boiler Pressure Relief Valves
Size Range: 3/4 to 2 in. (20 to 50mm)
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 boiler equipment. It consists of a
bronze body construction with NPT threaded female inlet and NPT threaded
female outlet (drain) connections, non-metallic disc-to-metal seating,
stainless steel spring, and test lever. Series 174A 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. Standard Pressure Setting: 30psi (206.9
kPa), Pressure Range: In 5psi (34.5 kPa) increments from 30 to 150psi (2 to
10 bar) with corresponding high ratings from 650,000 to 14,370,000 BTU/hr.
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Series: 374A
Description: Boiler Pressure Relief Valves
Size Range: 3/4 in. (20mm)
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. Standard Pressure Setting: 30psi (206.9
kPa), Pressure Range: In 5psi (34.5 kPa) increments from 30 to 150psi (2 to
10 bar) with corresponding high ratings at 550,000 BTU/hr.
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Series: 530C
Description: Calibrated Pressure Relief Valves
Size Range: 1/2 to 3/4 in. (15 to 20mm)
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. Maximum Pressure: 300psi (20.67 bar). Adjustable Pressure
Ranges: Sizes 1/2, 3/4 in. - 50 to 175psi (3.45 to 12.06 bar), Size 3/4 in. -
100 to 300psi (6.89 to 20.67 bar).
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Series: 740
Description: Boiler Pressure Relief Valves
Size Range: 3/4 to 2 in. (20 to 50mm)
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. Pressure Range: 30 to 75psi (2
to 5 bar) with corresponding high ratings from 925,000 to 10,700,000 BTU/hr.
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Series: 1L, 1XL
Description: Temperature and Pressure Relief Valves
Size Range: 1/2 in. (15mm)
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 tanks and hot water
heaters up to 15,000 BTU/hr. They feature a bronze body with NPT threaded
male inlet and NPT threaded female outlet connections, unique thermostat with
special thermo-bonded coating and test lever. Series 1L, 1XL are CSA listed.
Model 1L has 2 in. (50mm) thermostat and a test lever. Model 1XL has an
extension thermostat. Temperature Relief: 210°F (99°C), Pressure Relief
Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure Settings: 75, 100,
125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: 10L
Description: Temperature and Pressure Relief Valves
Size Range: 3/4 in. (20mm)
Model 10L 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
80,000 BTU/hr. It features a bronze body with NPT threaded male inlet and NPT
threaded female outlet connections, unique thermostat with special
thermo-bonded coating and a test lever. Model 10L is ASME rated and CSA listed.
Temperature Relief: 210°F (99°C), Pressure Relief Range: 75 to 150psi (5.2 to
10.3 bar), Standard Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03,
8.79, or 10.55 bar).
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Series: 100XL
Description: Temperature and Pressure Relief Valves
Size Range: 3/4 in. (20mm)
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
100,000 BTU/hr. They feature a bronze body with NPT male inlet and NPT female
outlet connections, unique thermostat with special thermo-bonded coating, and
a test lever. Model 100XL-8 is also available with 8 in. (200mm) extension
thermostat. Series 100XL is ASME rated and CSA listed. Temperature Relief:
210°F (99°C), Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bar), Standard
Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: SL100XL,
L100XL, LL100XL and LLL100XL
Description: Extended Shank Temperature and Pressure Relief Valves
Size Range: 3/4 in. (20mm)
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 protection to hot
water supply tanks and hot water heaters up to 100,000 BTU/hr (L100XL and
LL100XL) and up to 105,000 BTU/hr (SL100XL and LLL100XL). They feature an
extended shank for installation on water heaters with extra thick insulation
as well as a bronze body with NPT male inlet and NPT female outlet
connections, unique thermostat with special thermo-bonded coating, and a test
lever. Model SL100XL is suitable for water heaters with up to 1-3/4 in.
(45mm) of insulation. Model L100XL is suitable for water heaters with up to 2
in. (51mm) of insulation. Model LL100XL is suitable for water heaters with up
to 2-1/2 in. (64mm) of insulation. Model LLL100XL is suitable for water
heaters with up to 3 in. (76mm) of insulation. Series SL100XL, L100XL,
LL100XL and LLL100XL are ASME rated and CSA listed. Temperature Relief: 210°F
(99°C), Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bars), Standard
Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bars).
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Series: 40L, 40XL
Description: Automatic Reseating Temperature and Pressure Relief Valves
Size Range: 3/4, 1 in.. (20, 25mm)
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. Temperature Relief: 210°F
(99°C), Pressure Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure
Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: LL40XL,
LLL40XL
Description: Extended Shank Automatic Reseating Temperature and Pressure
Relief Valves
Size Range: 3/4, 1 in.. (20, 25mm)
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
tanks and hot water heaters. They feature an extended shank for installation
on water heaters with extra thick insulation as well as 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 LL40XL is available in sizes 3/4 and
1 in. (20 and 25mm). Model LLL40XL is available in size 3/4 (20mm) with an
extra long extended shank. Series 40L, 40XL valves are ASME rated and CSA
listed. Temperature Relief: 210°F (99°C), Pressure Range: 75 to 150psi (5.2
to 10.3 bar), Standard Pressure Settings: 75, 100, 125, or 150psi (5.27,
7.03, 8.79, or 10.55 bar).
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Series: 140S, 140X
Description: Automatic Reseating Temperature and Pressure Relief Valves
Size Range: 3/4, 1 in. (20, 25mm)
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 and
hot water heaters. They feature a bronze body with NPT female inlet and NPT
female outlet connections, unique thermostat with special thermo-bonded
coating (3/4 in.) or stainless steel thermostat (1 in.), tamper-resistant
bonnet screws, automatic reseating feature, and test lever. Model 140S has a
short thermostat for installation directly in available tank tappings. Model
140X has an extension thermostat for installation in the hot water outlet
within the allowable distance from the top of the tank. Series 140S, 140X
valves are ASME rated and CSA listed. Temperature Relief: 210°F (99°C),
Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure
Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: N240X, N241X
Description: Automatic Reseating Temperature and Pressure Relief Valves
Size Range: 1, 1 1/4 in. (25, 32mm)
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 and
hot water heaters. They feature a bronze body, stainless steel spring and
thermostat tube, tamper-resistant bonnet screws, automatic reseating feature,
and test lever. Model N240X has a NPT female inlet and NPT female outlet.
Mode N241X has a NPT male inlet and NPT female outlet. Series N240X, N241X
are ASME rate and CSA listed. Temperature Relief: 210°F (99°C), Pressure
Relief Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure Settings: 75,
100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: 340, 340X
Description: Automatic Reseating Temperature and Pressure Relief Valves
Size Range: 1 1/2 in. (38mm)
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 hot water
heaters. They feature a bronze body with NPT male inlet and NPT female outlet
connections, stainless steel spring and thermostat tube, tamper-resistant
bonnet screws, automatic reseating feature, and test lever. Model 340 has a 3
in. (80mm) thermostat. Model 340X has an 8 in. (200mm) thermostat. Series
340, 340X are ASME rated and CSA listed. Temperature Relief: 210°F (99°C),
Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure
Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar).
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Series: 342, 342X
Size Range: 2 in. (50mm)
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 and
hot water heaters. They feature a bronze body with NPT male inlet and NPT
female outlet connections, stainless steel spring and thermostat tube,
tamper-resistant bonnet screws, automatic reseating feature, and test lever.
Model 342 has a 3 in. (80mm) thermostat. Model 342X has an 8 in. (200mm)
thermostat. Series 342, 342X are ASME rated and CSA listed. Temperature
Relief: 210°F (99°C), Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bar),
Standard Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or
10.55 bar).
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