©Johnstone Supply eCatalog 216

HYDRONICS Valves

Flo-Chek Valves • Used to prevent gravity circulation • Allows use of the heating boiler to maintain domestic hot water • In multiple zone systems, allows circulation only to the zone(s) calling for heat • Thumb screw allows for manual opening for gravity feed applications

Specifications: • Maximum operating temperature: 277°F • Maximum operating pressure: 125 PSI WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Fig. Order #

Mfg. # 220-6 221-6 218-3

Conn. Size Body Type 1" NPT Cast Iron 1-1/4" NPT Cast Iron 3/4" NPT Cast Iron

Fig. Order #

Mfg. # 222-6 223-5

Conn. Size Body Type 1-1/2" NPT Cast Iron 2" NPT Cast Iron

L43-730 L43-731 L46-627

L46-628 L46-629

A A B

B B

A

B

Two-Way Flow Check Valves • Designed to provide positive gravity shutoff when circulator is not running • Easily opened for gravity circulation

• Iron body or brass body • Tapping can be utilized for expansion tank

Order # Mfg. # R54-586 856760 R54-588 856763 R54-589 856764 R54-587 856761

Model #

Conn. Size

Body Type

2000-M5 2000-M5 2000S-M5 2000S-M5

3/4" x 3/4" NPT

Iron Iron

1" x 1" NPT

3/4" x 3/4" Sweat

Bronze Bronze

1" x 1" Sweat

Hydrotrol™ Flow Control Valves • Prevents rooms (zones) from overheating due to gravity circulation • Straight-angle configuration allows for quick and easy installation

• Brass body and non-ferous internals with elastomer seals that provide a positive check, eliminating the need for an isolation valve WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. #

Model # HT-3/4

Conn. Size 3/4" NPTF

Order #

Mfg. #

Model # HT-1-1/4

Conn. Size

L39-675 L39-676

L39-677

107035 107037

107038

1-1/2" NPTF

HT-1

1" NPTF

Pressure Relief Valves Series 335 • Stainless steel spring • High heat resisting silicone disc • Bronze seat

• R55-746 has a male inlet connection • Product is not approved for potable water usage based on overall lead content

Order # Model #

Inlet Conn. 3/4" Male

Outlet Conn. 3/4" Female 3/4" Female

Conn. Size 3/4" Male

Body Type

Pressure Setting

BtuH

R55-746 M335M2-030 3/4

Bronze Bronze

30 30

510,000 510,000

R55-747

335M2-030 3/4

3/4" Female

3/4" Female

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