1/2" Two-Way Sweat Zone Valve

Taco 570-2 Hydronic Zone Valve – 1/2" Sweat, 2-Way, 24V Heat Motor Actuator

The Taco 570-2 is a 1/2" sweat connection, 2-way zone valve engineered for use in hydronic heating systems. It utilizes a 24V heat motor actuator with spring return to provide automatic flow control in response to a thermostat or relay signal. The valve is normally closed and opens when powered, isolating individual zones for precise temperature management.

Part of the 570 Gold Series, this model is designed for closed-loop heating systems and features a twist-off actuator head for fast service without disturbing the valve body. Its durable construction and silent operation make it suitable for residential and light commercial installations requiring reliable zone control.

Product Features

• Valve Type: 2-way, normally closed, sweat connection
• Size: 1/2 inch nominal
• Connection: Sweat (solder) ends
• Voltage: 24 VAC, 60 Hz
• Actuation: Heat motor with spring return
• Cv Rating: 3.5
• Maximum Pressure: 125 psi
• Maximum Water Temperature: 240°F (116°C)
• Manual Open Lever: Included for fill and purge operations
• Twist-Off Actuator Head: Allows service without draining the system

Application

Designed for zoning in hot water hydronic systems including baseboard, panel radiator, and radiant floor applications. The 570-2 valve provides automatic control over flow to individual heating zones, increasing system efficiency and occupant comfort.

Installation Notes

• Install with flow in the direction of the arrow on the valve body.
• Actuator head can be removed without cutting pipe or draining system.
• Control circuit must provide 24 VAC to open the valve; it closes automatically when power is removed.
• Use with compatible Taco or third-party zone controls rated for 24V.

Professional Use

This model is suitable for field installation by licensed plumbers and HVAC contractors. It is commonly used in zone valve systems controlled by low-voltage thermostats or integrated zoning relays. Its compact body and serviceable head design streamline maintenance and replacement in confined mechanical rooms.