Belimo ZG-M4 Retrofit Screws

The Belimo ZG-M4 Retrofit Screws are essential mechanical components designed for field-mounting Belimo actuators onto existing Characterized Control Valve (CCV) assemblies. This hardware kit provides the precise threading and structural integrity required to secure non-spring return actuators like the TR, LRB, NRB, and ARB series, as well as spring return actuators including the TF, LF, and AF models. By utilizing these HVAC retrofit mounting screws, technicians can maintain the proper alignment between the actuator and the valve stem, ensuring the equal percentage flow characteristic in 2-way valves and linear flow in 3-way mixing or diverting applications is preserved.

Engineered for compatibility with valve sizes ranging from 1/2" to 3", the ZG-M4 kit is built to withstand demanding hydronic environments. These screws support assemblies rated for close-off pressures up to 200 psi and static body pressures reaching 600 psi in smaller diameters. Whether you are servicing chilled water systems or hot water loops with up to 60% glycol, this CCV valve hardware ensures a zero-leakage seal (Port A to AB) by maintaining consistent downward force. For contractors performing Belimo actuator replacement or system upgrades, these screws are the professional standard for ensuring a reliable mechanical interface without modifying the original valve body.

• Universal CCV Compatibility: Simplifies inventory by providing a standard mounting solution for Belimo B2 and B3 valve series from 1/2" to 3".
• Maintains System Integrity: Provides the necessary torque resistance to handle high close-off pressures and high-temperature media up to 250°F.
• Fast Field Installation: Eliminated the need for custom brackets or improvised hardware, reducing labor time during HVAC actuator retrofitting.
• Precision Fitment: Designed specifically for Belimo TR, LR, and AR series actuators to prevent slipping or mechanical failure under high cycle rates.

Which actuators work with the ZG-M4 kit?
This kit is designed for a broad range of Belimo actuators. It is compatible with non-spring return (TR, LRB, NRB, ARB) and spring return (TF, LF, AF) models when mounting to CCV valve bodies.

Can these be used on valves larger than 3 inches?
No, the ZG-M4 is specifically engineered for Characterized Control Valves within the 1/2" to 3" range. Larger valves or different valve types (like Globe or Butterfly valves) require specific retrofit linkages or larger screw sets.

Are these screws corrosion resistant for cooling tower applications?
Yes, the hardware is designed for standard commercial HVAC environments and is suitable for use in high-humidity mechanical rooms and with glycol-treated water systems.

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.