Taco heat motor zone valves provide a convenient way to create individual zones or equipment isolation in a hydronic heating system. Utilizing one pump along with multiple zone valves, flow can be started, stopped, or diverted through the system to provide individual room or area comfort control and energy savings. Taco offers many versions and sizes of the heat motor zone valve to meet all your zone valve needs.

• Proven performance
• Rugged dependability
• Silent operation
• Twist off head
• Bellows or globe valve construction ensures positive shut-off and leak proof operation
• Patented construction
• Easy to install
• Manual open bypass lever
• 24 VAC powered with isolated end switch
• 100% factory tested
• Made in USA
• 3-year head, 5-year body warranty on the 570 series

Sid Harvey Item #:B163-77: Replaces Part #:'s : B163-2 | B163-2R | ZVA301-B163-77,

Taco B163-77

Tacos new shut-off Swivel-Flange combines a full-port, ball valve and companion flange to isolate system circulators for easy removal and service, without draining the system. Simplify your next 00 circulator installation while saving material and labor costs. Solid brass uni-body construction, available in 1/2 - 1-1/2" NPT or sweat connections. The Swivel-Flange provides easier installation and positioning of the pump and lever handle in the most convenient location.

• Is a combination full port shut-off ball valve and swivel companion flange
• Easy 1/4-turn open/close operation
• Positive shut-off, leak free design
• Swivel flange allows 360 deg rotation
• High quality teflon seats
• Full port ball valve for unrestricted flow
• The simple quarter turn, lever handle operation allows for easy isolation, removal and service of circulators without draining the system
• Each flange set includes bolts and nuts
• Epoxy powder coated steel flange

Sid Harvey Item #:SF-125T: Replaces Part #:'s : 5W297,
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Taco SFL100T Lead Free Solid Brass Shut-Off Ball Valve and Swivel-Flange Set 1" NPT,
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Taco SFL-075T Lead Free Solid Brass Shut-Off Ball Valve and Swivel-Flange Set 3/4" NPT,
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Taco SFL-075T

Taco SR504-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR504: Replaces Part #:'s : SIDSSR504,
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Taco SR504

Taco SR504-ExP-1 Formed Sheet Metal 4-Zone Switching Relay with Priority, 24 volt Power Input or Output Terminal, 120 VAC Transformer Input, DPDT

• External indicator lights
• Switchable priority
• Simplified wiring
• Fully enclosed snap-out relays
• Compact design
• Fuse protected
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• Plug-in power port card slots
• Add-on power control plug
• Interface with ExP zone valve controls
• Extended 3 years warranty
• (3) power port slots, (1) power control plugs

Sid Harvey Item #:SR504ExP: Replaces Part #:'s : 6C632,
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Taco SR504EXP

Taco 569 Class 2 Transformer, 40 VA, 120 VAC Primary, 24 volt Secondary

• For reducing line voltage to low voltage when used in conjunction with Taco zone valves
• Terminal screws for secondary connections
• 4 x 4" plate mount

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Taco ZVCXFR001RP Transformer ZVC 40 VA

Taco ZVCXFR001RP

Taco Flo-Checks prevent gravity circulation in forced hot water heating systems during periods when the boiler is hot, but the space heating zone is not wanted. This makes it possible to use the heating boiler to maintain domestic hot water year-round. You can also use Flo-Checks in systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. In addition, the thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating.

• In systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat
• Feature a thumb screw to manually open the valve and are available in a cast iron universal body and a bronze sweat in-line configuration
• The thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating
• Open automatically when the circulator starts running, when the room thermostat is satisfied and the circulator is stopped, the flo-checks close immediately, preventing gravity circulation
• Water or glycol media

Sid Harvey Item #:B146-22: Replaces Part #:'s : 21428,
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Taco B146-22

Taco Flo-Checks prevent gravity circulation in forced hot water heating systems during periods when the boiler is hot, but the space heating zone is not wanted. This makes it possible to use the heating boiler to maintain domestic hot water year-round. You can also use Flo-Checks in systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. In addition, the thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating.

• In systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat
• Feature a thumb screw to manually open the valve and are available in a cast iron universal body and a bronze sweat in-line configuration
• The thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating
• Open automatically when the circulator starts running, when the room thermostat is satisfied and the circulator is stopped, the flo-checks close immediately, preventing gravity circulation
• Water or glycol media

Sid Harvey Item #:B146-21: Replaces Part #:'s : 4031,
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Taco B146-21

Taco flo-cheks have dependably stopped gravity circulation in forced hot water heating systems for over 40 years. Flo-cheks open automatically when the circulator starts running. They feature a thumb screw to manually open the valve and are available in a cast iron universal body and a bronze sweat in-line configuration.

• Flo-cheks allow heat to flow only into the zones that are calling for heat
• Thumb screw can be manually opened for gravity feed applications if the main circulator stops operating
• Taco flo-cheks open automatically when the circulator starts running

Sid Harvey Item #:B146-20: Replaces Part #:'s : HYD160-B146-20 | 4030 |,
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Taco B146-20

Taco flo-cheks have dependably stopped gravity circulation in forced hot water heating systems for over 40 years. Flo-cheks open automatically when the circulator starts running. They feature a thumb screw to manually open the valve and are available in a cast iron universal body and a bronze sweat in-line configuration.

• Flo-cheks allow heat to flow only into the zones that are calling for heat
• Thumb screw can be manually opened for gravity feed applications if the main circulator stops operating
• Taco flo-cheks open automatically when the circulator starts running

Sid Harvey Item #:B146-19: Replaces Part #:'s : 21426,

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Taco B146-19