Page 329 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 5 Cold water systems

Rising spindle
Tap wheel head
Packing gland
Packing
Head workings

Jumper and washer

p Figure 5.102 BS 1010 pillar tap

Taps with a non-rising spindle to BS 5412
Unlike BS 1010 taps, these taps do not have a rising spindle. Instead, the spindle
has a thread at the end that lifts a hexagonal barrel, with a rubber washer attached,
inside the valve head workings. The spindle is fixed in the head workings by a circlip.

Non-rising spindle
Tap wheel head
Circlip
Spindle seals
Head workings
Barrel rises inside
the tap head

Washer

p Figure 5.104 BS 5412 pillar tap
p Figure 5.103 BS 5412 pillar tap head workings

There are many different styles and types of BS 5412 tap and each manufacturer
has its own style of conforming to the British Standard. The result of this is that
very few of the head workings are interchangeable between manufacturers.

BS 5412 taps are available as pillar taps for washbasins and bidets, high-necked
pillar taps for kitchen sinks, mixer taps for baths (¾-inch thread) and kitchen
sinks (½-inch threads), monobloc mixer taps and bib taps.

Ceramic disc taps
Unlike washer-type taps, ceramic disc taps use two thin, close-fitting, slotted
ceramic discs in place of rubber washers. One of the discs is fixed, while the
other is turned by the handle of the tap a quarter of a turn through 90°.
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