VG7251ET+3008D Johnson Controls Valve / Actuator

Overview

The Johnson Controls VG7251ET+3008D is a 1/2-inch two-way normally open cast bronze control valve and actuator assembly designed to strategically manage fluid flow in a variety of HVAC and commercial building environmental control systems. Equipped with a V-3000-8012 exposed pneumatic actuator, this assembly offers responsive, spring-return control for handling hot water, chilled water, <50% glycol solutions, and low-pressure steam applications.

Features

• Straight-through two-way piping configuration with union globe/union angle end connections.
• Equipped with an exposed V-3000-8012 pneumatic actuator providing spring-return fail-safe operation.
• Cast bronze body construction with a robust standard threaded stem and brass trim (brass plug and elastomer disc seat).
• Tested to withstand over one million cycles for long-term field reliability.
• In-place valve repacking capability allows for straightforward serviceability.

Specifications

• Valve Size: 1/2 inch
• Flow Coefficient (Cv): 1.8 Cv
• Flow Characteristic: Equal percentage
• Control Type / Action: Normally Open / Push-Down-to-Close
• Actuator Spring Range: 4 to 8 psig
• Valve Body Material: Cast Bronze
• Trim Material: Brass
• Connection Type: NPT (Union Globe)
• Pressure Rating: ANSI Class 250 (up to 400 psi for water up to 150°F)
• Maximum Closeoff Pressure Capability: Up to 38 psig for steam; water closeoff dependent on actuator setup (rated up to 191 psig closeoff with this configuration)
• Media Temperature Range: 35°F to 284°F (2°C to 138°C); handles saturated steam up to 35 psig

Applications

• Designed for hot water and chilled water control in commercial and industrial HVAC systems.
• Suitable for demand-based flow management in hydronic heating and cooling systems.
• Ideal for low-pressure steam application control up to 35 psig within building automation setups.