VG7251CS+3801B Johnson Controls Valve / Actuator

Overview

The Johnson Controls VG7251CS+3801B is a 1/2-inch, 2-way normally open (push-down-to-close) cast bronze control valve assembly equipped with a V-3801 compact pneumatic actuator. It features a union globe connection and brass trim, designed for the accurate modulation of fluids in commercial HVAC and building automation systems. The assembly uses an integrated pneumatic actuator to precisely position the valve plug in response to pressure signals from a controller.

Features

• Compact footprint allows for easy installation in restricted spaces like baseboard radiators and convectors.
• Sturdy die-cast aluminum actuator housing with an enclosed spring for enhanced durability.
• Single set screw design enables simple field mounting to the valve bonnet.
• Rolling synthetic rubber diaphragm provides a constant effective area throughout the stroke for stable force output.

Specifications

• Valve Size: 1/2 inch
• Flow Coefficient: 0.73 Cv
• Configuration: 2-Way Normally Open (Push-Down-to-Close)
• Actuator Type: V-3801-8001 Pneumatic Actuator
• Spring Range: 3-6 PSI (21-42 kPa)
• Close-off Pressure: 186 PSI
• Maximum Control Pressure: 30 psig
• Materials: Cast bronze body, brass trim, and synthetic rubber diaphragm
• Connection: Union Globe

Applications

This assembly is engineered for use in commercial building automation systems to control the flow of hot water, chilled water, glycol solutions, and low-pressure saturated steam up to 15 psig. It is ideal for tight mechanical configurations, perimeter heating applications, and zone temperature control.