Question 1

What is the difference between a 2-way and 3-way globe valve?

Accepted Answer

A 2-way valve controls flow by opening or closing a single flow path — used for on/off or modulating control. A 3-way valve has three ports and can mix or divert flow between two circuits, commonly used in heating/cooling coil bypass applications.

Question 2

Can Schneider Electric globe valves handle steam?

Accepted Answer

Some models can. The VB-7211 Series (bronze body) supports steam, while the VB-8213 and VB-8303 cast iron series are rated for water and glycol only. Always verify the media rating for your specific model before installation.

Question 3

What does Cv mean on a valve?

Accepted Answer

Cv is the flow coefficient — it represents the volume of water (in US gallons per minute) that flows through the valve at a 1 PSI pressure drop. A higher Cv means greater flow capacity. Proper Cv selection is critical for sizing valves to your system.

Question 4

What is the advantage of a pre-assembled ball valve assembly?

Accepted Answer

Pre-assembled assemblies are factory-matched and tested, reducing installation time and eliminating compatibility issues between valve body and actuator. They're ideal for new installations where speed and reliability are priorities.

Question 5

What is the difference between spring return and non-spring return actuators in these assemblies?

Accepted Answer

A spring return actuator (M313A00) drives the valve to a fail-safe position on power loss — useful for safety-critical applications. A non-spring return actuator (M333A01) holds its last position on power loss, suitable for applications where fail-in-place is acceptable.

Question 6

What applications are zone valve assemblies used for?

Accepted Answer

Zone valve assemblies are used for two-position on/off zone control in fan coil units, baseboard heating, and air handlers. They open or close a zone circuit based on a thermostat signal.

Question 7

What is the difference between the VT2313 and VS series?

Accepted Answer

The VS series adds steam compatibility. The VT2313 is rated for water and glycol applications only. If your system uses steam, specify a VS series variant.

Question 8

What is a spring return actuator and why is it used?

Accepted Answer

A spring return actuator uses a mechanical spring to return the valve or damper to a fail-safe position when power is lost. This is critical in HVAC applications where an uncontrolled valve position could cause system damage or safety issues.

Question 9

What is the difference between 2-position and proportional control signals?

Accepted Answer

A 2-position actuator is either fully open or fully closed — used for on/off control. A proportional actuator accepts a modulating signal (2–10VDC or 4–20mA) and positions the valve anywhere in its travel range for precise flow control.

Question 10

What does an auxiliary switch (SPDT) do on an actuator?

Accepted Answer

An SPDT aux switch provides a dry contact output that indicates actuator position — typically used to interlock equipment like fans or pumps so they only run when the valve is open. Models with 2 aux switches allow two independent interlock circuits.

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Schneider Electric Control Valves & Valve Actuators

Globe Valves

Frequently Asked Questions

Ball Valve Assemblies

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Zone Valve Assemblies

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Actuators

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