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Introduction

The common applications in HVAC valve control, each of which uses slightly different selection and sizing methods, are defined in the section headings in the table of contents. In addition to sizing, it is necessary to check specifications to ensure correct selection. Special conditions are possible which may make selection more demanding than the common applications. Glycol or other additives may make the specific gravity necessary to include in calculations. NEMA 3 or higher applications will require a enclosure. A combination of medium or ambient temperatures may make a special valve or protection of the actuator by thermal isolation necessary. Space constraints may dictate choice of valve type. Other special conditions may exist. The information necessary to properly size a valve is the same in all cases. If full information is not available, there will be cases where the valve will be incorrectly sized or the wrong valve will be selected. The pressure drop through coil and piping at design is usually unknown. Without this information correct sizing and selection cannot be assured. An adequate estimate is usually possible. See Belimo’s Valve Application Guide Doc V4.2 for a detailed discussion of basics of valves, coil characteristics, valve authority, actuator considerations, loop tuning, and heat transfer calculations. Sizing information: • Pipe size • Flow rate in GPM or # of steam • Density of medium (water = 1) • Pressure drop through coil and piping at design • Desired pressure drop through valve in full open position Selection information: • 2-way or 3-way • Allowable leakage • Temperature of medium and ambient • Environment (Nema 4 required, ambient temperature, etc.) • Space constraints • Actuator selection requires control signal definition and any special needs.

 

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PRICE:

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