ZZ-V-25 Valves And Valve Spuds Caps And Cores, Pneumatic Tire \(S/S By A-A-52611\)

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ZZ-V-25E

The Tire and Rim Association (T&RA) , Inc. :

Yearbook.

(Application for copies should be addressed to the Tire and Rin Association, Inc,. 3200 West Market

Street Akron, OH 44313. )

3. REQUIREMENTS

3.1 Preproduction sample. When required (see 6.2), and as specified by the contracting of office, the

products furnished under this specification shall be those which have been inspected and which have pased

the preproduction inspection specified herein (see 4.2) .

3.2 Materials. Materials shall be as specified herein.

When not specifically covered, materials

shall be suitable for the intended use.

3.2.1 Valve materials.

Metal valve stems shall be of brass.

3.2.1,1 Valve stems.

3.2.1.2 Rubber valve covers and bases. Rubber covers end bases of valves shall be made from compounds

containing isobutylene-isoprene synthetic rubber (butyl ), synthetic natural, natral rubber,

styrene-butadiene synthetic rubber (SBR), or ethylene-propylene-diene terpolymer (EPDM).

3.2.1.3 Base preparation of valves for replacement use. Tire valves With a rubber base shall have a

layer of uncured gum stock cemented to the baas to permit their air-tight application to the buffed and

cleaned valve-hole locations, and cemented when necessary on the inner tubes when cured with commercially

available field vulcanizers (Refer to manufacturer's recommendations.)

3.2.3 Cap materials. Cap shells shall be made of brass, nylon, or polyethylene. Unless otherwise

specified (see 6.2), and TR-VC-3 cap seats shall be of sealant material.

3.2.3 Core materials. Core barrels, swivels, stems, and gasket cups shall be of brass or equipment.

Core seal spring shall be of stainless steel. Materials characterisitcs of the cores shall not change

sufficiently so as to affect valve performance when subject to the operational environment.

Spud materials.

3.2.4

3.2.4.1 Spud stems. Spud stems shall be of brass.

3.2.4.2 Rubber base spuds. Rubber bases of spuds for application to Inner tubes conforming to

22-1-550 shall be of the ssame materials shown in 3.2.1.2.

3.2.4.3 Base preparation spuds for replacement use. Spuds with a rubber base

shall have the same preparation as rubber valve bases for replacement use (see 3.2.1.3} .

Grommets shall be of rubber compound type EPDM (ethykne-propylene) or

3.2.5 Grommet materials.

equivalent.

3-2.5.1 Ozone resistance. All grommets and rubber valve parts, as part of production, shall have

resistance to weather ing as accepted in standard commercial practice.

3.3 Desi gn and construction.

3.3.1 Valve.

3.3.1.1 Valve components. Unless otherwise specified (see 6 .2) , valves shall conform to the

applicable reference (see 1.2.1). Each valve shall consist of a cap, a core, and when required a spud,

all as specified herein as well as a metal stem, *r-cove*, when required. All caps, cores, and

spuds used as valve components shall meet all applicable requirements. -

3.3.1.: Valve interior design. Valve interior design shall be such that when the core AS properly

installed , the tip of the core plunger pin shall position .035 below, to .010 above, the valve hp.