Category: V-Belts

Understanding V-Belts

HVAC Systems use many different sizes and styles of V-Belts. The 2 main styles used on HVAC System is the Standard V-Belts and Cogged v belts. Standard v-belts are more commonly used as these are more price effective. Cogged V-Belts may run better on smaller diameter pulleys because of the belts flexibility.

How to Interpret the Prefix of any Belt Part Number:

The prefix offers dimensional standards, and somewhat defines the purpose of the belt. Understanding this allows you to know which belts can be substituted, and which cannot.

2L, 3L, 4L, and 5L prefix – The “L” stands for light duty, and is designed for use with fractional horsepower motors (less than 1 HP). “L” style belts are often designated as light duty industrial.

A, B, C, D, E, And AX, BX, CX, and DX size belts are for industrial applications. They are sometimes referred to as “Conventional” belts. The “X” is a standard specification for inside perforations also known as notched or cogged belts. Although “Conventional” belts can be substituted for “L” style belts which appear to be the same, “L” style belts should never be used as replacements for “Conventional” belts.

Sources says that “X” designation belts last longer than those without it. Notched or cogged belts are also more efficient for the motor because of reduced slippage.

3V, 5V, 8V, AVX, BVX, CVX, DVX, V and VX belts are specifically designed for higher horsepower and longer center distance applications. For example, most applications up to 7.5 HP where a single belt is being utilized, an A or B belt is more than adequate to do the job. The V and VX belts, on the other hand, may be better for 10HP and larger.

Contact our Sales Team if you need more information on the right V-Belts for your HVAC System.