QTM Mast linkST Mast linkPT Mast linkYT Mast linkWT Mast linkXT Masts linkTrailer Mast linkMast Configurator linkAir Supply linkType 73 Mast linkDAF Mast linkSeries 90 Mast linkSCAM Series Mast linkType PU Mast link

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Air Supply For Telescopic Masts

The use of air as a fluid medium for the extension of a telescopic mast offers advantages. The use of air as a fluid medium for the extension of a telescopic mast offers advantages and disadvantages.

Foremost advantage, for a portable mast, is that air is all around us and that does not need to be carried around. Air can be easily pressurised above the ambient pressure by means of a simple handpump as in the QT Series or a power driven compressor for the other Series. It is easily controlled by means of simple valves. Leakage, if it occurs, is clean.

Disadvantages are the water content of atmospheric air which changes with the pressure and temperature. Water can lead to corrosion which Clark Masts overcomes by careful choice of material. The second disadvantage is compressibility itself. This is not a problem when lifting relatively light loads unless the telescoping sections themselves become obstructed when the spring effect of compressed gas can affect smooth extension. The use of low air pressure of 1.5 kg/cm2 (21 lbs/in2g) maximum permits a headload which is proportionate to the mast size. Usually the pressure necessary to lift is much less than the maximum.

In this section is shown the range of equipment available from which to choose for every installation.

Hand Pumps

QT Handpump: - Cat. No. 9256 QT Handpump: - Cat. No. 9256
This is the simplest source of air pressure from Clark Masts. It has a long stroke with a highly efficient internal valve to minimise operator's effort, unlike the unsuitable automobile tyre foot pump. It is complete with integral control valve, making the pump a complete mast control unit.

Wall bracket: - Cat. No. 9330Wall bracket: - Cat. No. 9330
An aluminium bracket which makes mounting the above pump easy.

QT/FM Handpump: - Cat. No. 9611 (not shown)
This is a field-operation version of the QT pump.

SCAM Handpump: SCAM Handpump: - Cat. No. 3508
Originally made for use exclusively with the SCAM Series of masts, its slightly greater capacity makes this handpump suitable for masts up to the WT Series. General characteristics are similar to the above pump.

Power Packs - Air compressors with mast control

Model 30E Power PackModel 30E Power Pack
Cat. No. 11434 (12V), Cat. No. 11435 (24 V)
This battery powered Power Pack / Control is the simplest unit. A switch controls the raising of mast and a separate manual valve controls the retraction. An internal pressure switch of Clark Masts manufacture cuts-out the compressor when the mast is fully extended and automatically cuts-in again should there be air leakage from the system. Output of free air is approximately 30 litres / minute.

Model 30A Power Pack with remote controlModel 30A Power Pack with remote control
Cat. No. 25056 (12 V), Cat. No. 25057 (24 V)
These battery powered Power Packs have a separate control which may be placed remotely up to 2,5 metres. The control is pneumatic for reliability. A pressure switch which when correctly adjusted cuts-out when the mast is fully extended, saves battery power and cuts-in to replace any air leakage in the system. Compressor unit is the same as Model 30E.

Model 30P Power Pack (not shown)
Cat. No. 15490 (12 V), Cat. No. 15491 (24V)
Using the same oil-less compressor as other Model 30 Power Packs, this unit is configured for easily carried portable use.

Model 200 Power PackModel 200 Power Pack
Cat. No. 10937 (12V), Cat. No. 10938 (24V)
The largest of the Clark Masts Power Packs. It features a Vee-twin oil-less piston compressor which pumps about 200 litres/minute of free air. The electrical remote control has a cable 2.5 m long and controls an electric exhaust valve or the
start of the compressor for mast extension. A pressure switch stops the compressor when the mast is fully extended and restarts it in the case of air leakage. Result is single action selection of mast extension or retraction.

Compressors

Model EC200Model EC200
Cat. No. 10502 (2201240V 1 Ph 50 Hz 37 IN)
This compressor is not a system. It provides the compressor unit which must be incorporated in an air system with control, switches and safety feature by the customer / user. The power connection is by a CEC 22 plug. A control valve Type CBR1 is required.

Model PC200Model PC200
Cat. No. 10503
Similar to the above compressor unit, the principal difference is that power is from a petrol engine. If the mast is provided with a bayonet socket B3563 no control valve is necessary for mast extension. A 3 metre hose and bayonet connector is supplied standard.

Control Valves

CBR1 Control Valve
Cat. No. 1741
A single lever control valve for use with any air system using an air compressor. Porting is arranged to relieve the compressor in the mast "hold" or "down" selections.

AB Control Valve AB Control Valve
Cat. No. 14567
This valve gives a single knob control for air to the mast when the air source is an air bottle or vehicle brake reservoir. Has automatic safety relief should the air pressure
be inadvertently too high.

Pressure Regulating ValvePressure Regulating Valve
Cat. No. 16991
This valve is necessary to reduce the air pressure available, to the air pressure required, in the case of air supply at higher pressure.