Section 16
of Water Supply Regulations 1961 Reprinted 1999
Section 16
(1)
Every ball tap or valve of the “Portsmouth” type, and of a nominal size not exceeding two inches, shall comply with B.S.S. 1212: 1953 for such a tap or valve.
(2)
Every ball tap or valve, not being of the “Portsmouth” type, shall comply with the following requirements –
(a)
every high pressure ball tap shall close against a test pressure of two hundred pounds to the square inch; every medium pressure ball tap against a test pressure of one hundred pounds to the square inch; every low pressure ball tap against a test pressure of forty pounds to the square inch; and every such fitting shall have the letters “H.P”, “M.P.”
or “L.P.”, respectively cast or stamped on the body of the fitting;
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(b)
the valve shall be provided with a washer of good quality rubber, or some other equally suitable material, enclosed in an internally flanged cap screwed to the piston;
(c)
the body and the piston shall be of a corrosion-resisting alloy; the lever shall be of corrosion-resisting alloy or copper and shall be of sufficient rigidity not to bend permanently under working conditions; and the float shall be of copper or some other equally suitable material;
(d)
if the float is a copper sphere, its minimum thickness when finished bright shall be not less than twenty-six standard wire gauge in cases where the external diameter of the sphere does not exceed six-and-a-half inches, and not less than twenty-four standard wire gauge in cases where the external diameter of the sphere exceeds six-and-a-half inches. If the float is of copper of some other shape, it shall be of adequate thickness; and the joining of copper float shall, in any case, be effected by means of an efficient, solderless, compression seam, or by brazing.
Storage cistern.