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Throughput in mass flow rate
Even if the volumetric flow rate is quasi unchanged with falling pressure level, the number of molecules in that
pumped volume is not. By definition: the deeper the vacuum, the lower the amount of molecules in the same volume
of air. This means that the mass flow will decrease with decreasing (absolute) pressure. It is clear that a flow rate
must be stated at a certain vacuum level when using this denotation.
2.2 Introduction
The DZS series claw pumps are single-stage, dry vacuum and over-pressure pumps driven by an electric motor. The
vacuum and over-pressure pumps are air-cooled.
The pump is designed to be run as a vacuum pump or an over-pressure pump dependent upon its configuration.
The pump is specifically designed to work with clean air, inert gas or small amounts of water vapor. The ambient
temperature must be between 0 °C to 40 °C.
These pumps are enclosed in a sound-insulated bodywork to aid noise reduction, cleanliness and heat transfer.
The DZS claw pump robust design ensures complete flexibility and quick access to all parts. The claw pump mainly
includes dry claw element, gearbox, electric motor and drive train all mounted on a common base frame.
Element
The pumping chamber consist of duplex set of rotating claws / rotors on cantilevered shafts. The two claws and the
cylinder are all non-touching but have accurate clearances to allow a very efficient performance.
The main chamber is completely lubrication free and designed with corrosion resistant materials. The whole assembly
is referred to as an element.
Inlet non-return valve
Inlet non-return valve prevents reverse flow of inlet air and thus prevents reverse rotation of the pump.
Gearbox
The element is driven through an oil lubricated gearbox housing synchro-meshing gears which in-turn is coupled to
a direct drive motor.
Electric motor
Electric motors are 3 phase ‘multi voltage/multi frequency’. For 60Hz supplies they are cUL/UL approved. The main
motor options are:
200/230V 50/60Hz
400V 50Hz
380V 60Hz
500V 50Hz and 575 60Hz
460V 60Hz
230/460V 60Hz (Optional)
The motors are suited to operate with Variable Speed Drive to have complete controllability and to reduce power
consumption. This efficiency improvement leads to power reduction and consequently a lower carbon footprint.
Following standard features provided with the pump:
Vacuum relief valve (In case of vacuum pump)
The relief valve is designed to open at a predetermined set pressure to protect the pump from damage.
When the vacuum level is exceeded, the relief valve opens and allows air to enter the pumping chamber. This
has the effect of internal cooling.
Intake filter (In case of over-pressure pump)
Intake filter prevents foreign material from entering the pump. Abrasive, bulky material will damage the pump’s
internal parts and could cause catastrophic failure.
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