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Valve Stems | Coyote Accessories

The Valve Stem Assembly is a self-contained valve which opens to admit gas to a chamber (such as air to inflate a tire), and is then automatically closed and kept sealed by gas pressure and/or spring to prevent the gas from escaping.  Valve Stems a.k.a Tubeless Tire Valve, are available in many different configurations and sizes.  

 

 

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The Valve Stem Assembly has 3 major components:

Valve Stem
Valve Core
Valve Cap

 

 

 Valve Stem Sizes

Depending on the application, valve stems holes in wheels will be typically 0.453” for cars / light duty trucks and 0.625” for heavy duty / commercial truck applications.

Based on application, valve stems are available to fit 0.453” or 0.625” holes.  Some clamp in models are configured to work in either size hole by simply changing the supplied grommet to different size.

 

 

 Valve Stem Types

Coyote Valve Stems

 

Coyote offers three basic types of valve stems used in tubeless tire applications are:

Snap-In

Snap-in valves allow a maximum cold tire inflation pressure of 65 psi and are designed for passenger car, light-duty trailer and light trucks. Valve snaps into a small diameter hole in the wheel. Stems available in 0.453” or 0.625” hole stem hole configurations.

High-Pressure Snap-In

High-pressure snap-in valves are designed for medium and heavy-duty trucks and trailers and must be used when recommended cold tire inflation pressures exceed 65 psi. Stems available in 0.453” or 0.625” hole stem hole configurations.

High-Pressure Metal Clamp-In

High-pressure metal clamp-in valves can be used with virtually any wheel and are highly recommended for all track activities, as well as when vehicle speeds may exceed 130 mph. Metal clamp-in valves use a rubber grommet to seal against the wheel when their retaining nut is tightened. Metal clamp-in valves allow a maximum operating pressure of 200 psi.

TPMS Valve Stems

Coyote Accessories offers snap-in and bolt-in style valve stem assemblies for TPMS applications. 

Valve Cores

Brass and Nicle Valve Cores

Regardless of the valve type, the valve core is the fundamental sealing device and should be snugly screwed into the valve core chamber. Valve cores come in short and long lengths, with the short length being preferred for high performance applications.

Valve cores are available in both nickel-plated and brass-plated varieties. Nickel-plated valve cores are used in the aluminum valve stems of tire pressure monitoring sensors because using a standard brass valve core in an aluminum valve stem will often cause galvanic corrosion. 

All valve cores feature a seal attached to a movable, spring-loaded pin that allows pressurized air to pass when inflating a tire, or to allow air to escape when the pin is depressed to unseat the seal. Valve cores have a working pressure of 300 psi.  It is important to protect them from grit, sand and moisture. Grit and sand might prevent valve cores from sealing completely, and moisture can freeze in cold temperatures and defeat the seal.

Valve Caps 

Valve Caps are available in plastic and metal. The plastic caps are fine for normal driving whereas  metal valve caps to designed to withstand the high temperatures applications. Valve caps are knurled to make it easier to tighten or loosen them, while some metal caps feature hex head designs tools are available for easier removal and installation. Valve caps use a rubber washer or o-ring to seal the valve completely.

High-speed pressure loss and core contamination are reasons why valve caps should always be used. In the event anything disrupts the valve core's seal, the valve cap provides a backup seal that prevents air from escaping.

Coyote Quality

Valve Stem – Snap In

Snap In Valve Stems are constructed of a threaded hollow cylindrical brass tube and covered with 30% EPDM rubber molding. EPDM, (ethylene propylene diene monomer) is a type of synthetic rubber that exhibits resistance to hydraulic fluids, similar to the characteristics of brake fluid, and outstanding resistance to heat, ozone, and weather. Our competitors often use a threaded hollow cylindrical aluminum tube and covered a lower grade of EPDM rubber. All our valve stem assemblies offered are manufactured to SAE requirements.

Valve Stem – Metal Bolt In

Bolt In Valve Stems are constructed of a threaded hollow cylindrical tube and chrome plated.  Rubber grommets used for sealing are made of 30% EPDM rubber molding. EPDM, (ethylene propylene diene monomer) is a type of synthetic rubber that exhibits resistance to hydraulic fluids, similar to the characteristics of brake fluid, and outstanding resistance to heat, ozone, and weather   All Coyote valve stem assemblies offered are manufactured to SAE requirements.

Valve Stems

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