Honeywell VP512A1726 Pneumatic Unit Vent Control Valve 1" Straight 10 Cv Normally Open

The Honeywell VP512A1726 is a pneumatic unit ventilator valve with actuator featuring a 1" NPT straight pattern, 10 Cv flow capacity, 3-8 psi spring range, and 13 psi main pressure. This normally open, single-seated valve is designed for proportional control of steam and hot water in unit ventilator applications, making it ideal for HVAC systems requiring precise temperature regulation.

Key Features:

• Equal percentage, high lift throttling guide provides accurate control over wide load variations
• Molded replaceable composition disc for tight shut-off with replaceable brass seat
• Self-adjusting, spring-loaded Teflon packing for reliable sealing
• Back-seating allows repacking without shutting down or draining system
• Rotatable actuator for aligning air connection with control air piping
• Integral union connection to simplify installation and service
• Rolling diaphragm for long life and low hysteresis

Technical Specifications:

• Connection Size: 1" External NPT
• Flow Coefficient (Cv): 10
• Spring Range: 3-8 psi
• Main Pressure: 13 psi
• Body Pressure: 150 psi maximum
• Valve Action: Normally Open (N.O.)
• Configuration: 2-way, straight-through body
• Control Type: Proportional

This valve is suitable for proportional control of steam/hot water in unit ventilator applications, with replacements available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices. The VP512A1726 replaces obsolete model VP520A1007, offering improved performance and serviceability for commercial and institutional heating systems.