Xylem 78 3/4" Water Main Vent Valve 150 PSI Cast Brass

The Xylem-Hoffman Specialty Model 78 water main vent valve is designed for automatic air venting in high-pressure hydronic heating and cooling systems. This industrial-grade vent valve features a durable cast brass body construction and is ideal for use on hot or cold water mains, glycol systems, and process applications with specific gravity greater than 0.7.

Key Features:

• Cast brass body construction for long-lasting durability and glycol compatibility
• 3/4" NPT straight shank connection for easy installation
• Built-in check valve prevents air from re-entering the system when pressure drops
• Body unscrews for convenient cleaning and maintenance
• Tapped at top with 1/8" NPT safety drain connection for moisture discharge
• Top-mounted replaceable seat isolated from system debris
• Maximum operating pressure: 150 PSI (10.3 bar)
• Maximum hydrostatic pressure: 450 PSI (31.1 bar)
• Maximum temperature rating: 250°F (121°C)

The Hoffman Model 78 features a unique built-in check valve that ensures vented air cannot return to the system when pressures fluctuate. The threaded 1/8" NPT air outlet allows for connection of a piped drain where water leakage needs to be controlled. Dimensions: 6-1/2" height, 2-11/16" width.