©Johnstone Supply eCatalog 216

HYDRONICS Valves

Pressure Safety Relief Valves For Protection of Hot Water Heating Boilers • Watts series 374A ( R54-684 ) and 174A ( R54 685 , R54-686 , R55-839 and R55-840 ) are designed and recommended for hot water heating and supply boilers • Watts series 740 ( R54-687 and R54-688 ) valves are specially designed for hot water space heating boilers Features: • ASME certified

• Pressure pre-set @ 30 PSI • Maximum temperature: 250°F (121°C) • Meets military spec. MIL-V-18634B, Type I, Class 3A, Style A (bronze body), Style B (iron body) • Product is not approved for potable water usage based on overall lead content • Used in conjunction with temperature relief valves where separate installation of safety devices is required or desired

B

A

Fig. Order #

Mfg. #

Model #

Inlet Conn.

Outlet Conn.

Conn. Size Body Type

Pressure Setting

BtuH

R54-684 358553 374A-BRZ-030 CAN 3/4"

A A A A A B B

3/4" 3/4" 3/4" 3/4"

3/4" 3/4" 3/4" 3/4"

Iron — Bronze Inlet

30

550,000 650,000

R54-685 274428 174A-030 3/4

3/4" 3/4" 3/4"

Bronze Bronze Bronze Bronze

30* 100 150 30* 30* 30*

R55-839 R55-840

274683 174A-100 3/4 274836 174A-150 3/4

1,695,000 2,445,000 1,005,000

R54-686 274934 174A-030 1

1"

1" 1"

1"

R54-687

382008 740-030 3/4

3/4"

3/4"

Iron — Bronze Outlet Iron — Bronze Outlet

925,000

R54-688 382570 740-030 1

1"

1-1/4"

1"

1,300,000

Relief Valves • Installed in systems to discharge water should excessive pressure develop • Can only be used for non-potable applications per the Safe Drinking Water Act • Dual units have a relief valve, diaphragm operated, with low differential between opening and closing pressures and a reducing

valve with a built-in low inlet pressure check valve • L37-316 ASME rated, 790,000 BtuH • L37-317 ASME rated, 1,170,000 BtuH WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. #

Conn. Size

Body Type

PSI Setting Relief

Wt. Lbs.

L37-316 L37-317

110121 110129

3/4"

Bronze Bronze

30 30

1.25 1.50

1"

Pressure Safety Relief Valve Steam Safety Relief Valve

Order # Model #

Inlet Conn.

Outlet Conn.

Conn. Size

Body Type

Pressure Setting

R56-813 315M2-015

3/4"

3/4"

3/4"

Bronze

15

Pressure Reducing Valves • Protects heating and plumbing systems against excessive line pressures • Each valve is equipped with a low inlet pressure check valve and a removable strainer • High pressure valve reduces incoming 125 PSI to 45 PSI • Tested and certified to NSF 372 low lead requirement

• “F” models have manual “fast fill” feature Specifications: • Maximum operating temperature: 225°F • Maximum working pressure: 125 PSIG • Maximum flow: 5-1/2 to 6 GPM at 125 PSIG inlet pressure WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Pressure Range PSIG

Pressure Range PSIG

Fig. Order #

Mfg. # B-38 B7-12

Conn. Size

Fig. Order #

Mfg. # FB-38

Conn. Size

A

B

L47-346 L47-347 L47-348

L47-349 L47-350

A A A

1/2" 3/4" 3/4"

10 to 25 10 to 25 25 to 60

B B

1/2"

10 to 25 10 to 25

FB-38TU 1/2"

7

500

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