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valve is set to the 'Pump' position movement of the tank assembly relative to the elevation tube causes the
ram cylinder to operate as a pump. When the tank assembly is raised air at atmospheric pressure is drawn
into the ram cylinder through a non-return valve in the head of the piston. During the downstroke the air is
compressed by the piston and admitted to the tank through the non-return valve in the tank top plate to build
up pneumatic pressure.
16 A steering ring (1) is located at the top of the tank assembly. It may, as its name suggests, be used for
steering the pedestal, but is intended primarily for use as a handle, when pressurizing the pedestal or altering
its height (Section 2).
17 The safety latch (2) and control valve are located close to the steering ring and are positioned in such a
way as to minimise the risk of accidental operation.
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