Weil McLain 635-100-022 Valve

The Weil McLain 635-100-022 3-way valve body is a professional-grade replacement engineered specifically for the Weil McLain CGt Series 1 and 2 residential gas boilers. Designed to replace the VCZMS6100/U, this brass 3-port valve body is critical for maintaining precise boiler water flow control and ensuring thermal balance within hydronic heating systems. As a direct-fit HVAC replacement part, it integrates seamlessly with your existing Weil McLain boiler trim, matching the performance specifications required for high-efficiency system regulation. This hot water boiler valve is built to withstand the rigors of high-temperature service and domestic heating cycles, minimizing pressure drops while maximizing the response time of your boiler control system. For contractors and service technicians, utilizing this OEM-equivalent valve body ensures consistent compatibility with standard 24V actuators and traditional piping layouts found in CGt gas boilers, effectively resolving issues related to flow bypass or improper zone distribution.

• Direct OEM Compatibility: Engineered as a drop-in replacement for Weil McLain 635-100-022 and VCZMS6100/U, reducing field modification time.
• Enhanced Flow Regulation: Precision-machined 3-way configuration allows for reliable water trim and temperature stabilization across the heat exchanger.
• Contractor-Grade Durability: Robust brass construction delivers long-term resistance to mineral buildup and corrosion in closed-loop systems.
• Optimized Efficiency: Restores factory-spec bypass and mixing functions to prevent short-cycling and maintain CGt series boiler performance.

Is the 635-100-022 compatible with the CGa series?
No, this specific valve body is designed and calibrated for the flow requirements of the Weil McLain CGt Series 1 and 2. Always verify your specific boiler model before installation.

Does this include the actuator or just the body?
This is the 3-way valve body only. If you are experiencing electrical failure or the motor is not turning, you may also need to source the compatible 24V actuator separately.

Which part numbers can this replace in the field?
This component is the designated replacement for 635-100-022, 381-357-000, 381-357-936, and VCZMS6100/U valve bodies.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.