VG7251PT+3008B Johnson Controls Valve / Actuator

Overview

The Johnson Controls VG7251PT+3008B is a high-performance valve and actuator assembly designed to regulate the flow of water and steam in commercial HVAC and building automation systems. This unit combines a 1-1/4 inch union globe valve with a V-3000-8011 exposed pneumatic actuator, operating with a 3 to 6 psi spring range. Built with a cast bronze body and brass trim, it provides reliable, long-lasting modulation and a spring-return fail-safe mode that defaults to normally open upon loss of pneumatic pressure.

Features

• Combined assembly featuring a 1-1/4″ union globe valve and an exposed pneumatic actuator
• Spring-return fail-safe mechanism ensures the valve defaults to a normally open state
• High-durability cast bronze body construction equipped with dependable brass trim
• Utilizes an inherent equal percentage flow characteristic for precise modulating control
• Proven design tested to withstand over one million cycles for extended operational longevity
• Designed with convenient serviceability features including in-place valve repacking

Specifications

• Manufacturer: Johnson Controls
• Part Number: VG7251PT+3008B
• Product Series: VG7000 Series Pneumatic Control Valves
• Pipe Size: 1-1/4 inches (1.25″)
• Flow Capacity: 18.5 Cv
• Body Pattern: Two-Way
• Configuration: Union Globe
• Actuator Model: V-3000-8011
• Control Signal / Spring Range: 3 to 6 psi
• Fail-Safe Mode: Spring Normally Open
• Medium Temperature Range: 35°F to 248°F (2°C to 120°C) for water; maximum 284°F (138°C) at 35 psig for steam
• Maximum Pressure Rating: 400 psi up to 150°F, decreasing to 365 psi at 248°F for water; 35 psi for steam
• Valve Stroke: 1/2 inch (13 mm)
• Pressure Class: ANSI Class 250 (ANSI B16.15)
• Leakage Rating: ANSI Class IV (0.01% of maximum flow)

Applications

• Designed primarily for demand-responsive regulation of hot water, chilled water, and glycol solutions (up to 50%) in commercial environmental control applications.
• Suitable for low-pressure steam control up to 35 psig within industrial and institutional heating networks.
• Ideal for seamless integration into commercial HVAC equipment, hydronic heating networks, cooling systems, and localized building automation systems.