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The Road Vehicles (Construction and Use) Regulations 1986

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This is the original version (as it was originally made). The electronic version of this UK Statutory Instrument has been contributed by Westlaw and is taken from the printed publication. Read more

PART IISPECIFICATION FOR BRASS OR BRONZE VALVES

Manufacture of valves

1.  The stamping or pressing from which each valve is manufactured shall be made from bars produced by (a) extrusion, (b) rolling, (c) forging, (d) extrusion and drawing, or (e) rolling and drawing.

Heat treatment

2.  Each stamping or pressing shall be heat treated so as to produce an equiaxed microstructure in the material.

Freedom from defects

3.  All stampings or pressings and the bars from which they are made shall be free from cracks, laminations, hard spots, segregated materials and variations in composition.

Tensile test

4.  Tensile tests shall be made on samples of stampings or pressings taken at random from any consignment. The result of the tensile test shall conform to the following conditions—

  • Yield Stress.—Not less than 231.6 N/mm 2.

  • Ultimate Tensile Stress.—Not less than 463.3 N/mm 2.

  • Elongation on 50 mm gauge length.—Not less than 25%.

Note.—When the gauge length is less than 50 mm the required elongation shall be proportionately reduced.

The fractured test piece shall be free from piping and other defects (see paragraph 3 of this Part of this Schedule).

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