McDonnell & Miller TC-4 Valves

For industrial boiler applications requiring precise low water cut-off (LWCO) verification, the McDonnell & Miller TC-4 Test and Check Valves (Part Number 195000) provide a critical interface for maintenance and safety compliance. This 1" NPT dual-valve set is engineered specifically for use with McDonnell & Miller controllers, allowing technicians to isolate the water column and simulate low-water conditions without draining the entire system. Featuring an integrated vacuum breaker, the TC-4 valve set prevents vacuum lock during testing, ensuring accurate buoyancy response from the internal float mechanism. The heavy-duty cast bronze construction is built to withstand high-pressure steam environments, facilitating blow-down maintenance routines that clear sediment and scale. Integrating McDonnell & Miller 195000 components into your steam boiler safety protocol ensures reliable LWCO operation and simplifies the mandatory testing required by jurisdictional boiler codes.

• Streamlined Testing: Simplifies the verification of low water cut-off functionality without requiring a full boiler drain.
• Vacuum Prevention: The built-in vacuum breaker ensures the system returns to atmospheric pressure for accurate level detection.
• Superior Durability: Rugged design suitable for high-temperature HVACR steam systems and industrial hydronic applications.
• Precise Fit: Standard 1 inch NPT connections allow for seamless integration with existing McDonnell & Miller water columns.

What is the primary function of the TC-4 valve set?
The TC-4 allows for the isolation and testing of the LWCO float mechanism, ensuring the burner circuit breaks correctly during a low-water event.

Can the vacuum breaker be serviced independently?
The vacuum breaker is designed to be low-maintenance, but the entire assembly should be inspected during annual boiler teardowns for scale accumulation.

Does this kit include both the upper and lower valves?
Yes, the TC-4 package includes both the upper and lower test valves required for a complete water column installation.

This item is not eligible for free shipping.

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.