3 Product description
3.1 Functional description
The operating principle of the roots pump is based on 2 synchronous pistons that rotate in a housing
without touching. The pumping effects arise as a result of the opposing rotation of the 2 figure-of-eight
shaped rolling pistons. While suction chambers are formed between the rolling pistons and the housing,
the rolling pistons continuously form a mutual seal without touching each other or the housing. A pair of
gears positioned on the extended shaft ends, causes the opposing, synchronous running of the roots
pistons. Lubrication is limited to the two bearing and gear chambers which are arranged separately from
the suction chambers. Operation with a backing pump connected upstream enables compressing
against atmospheric pressure.
Roots pumps from the ATEX series are equipped with a magnetic coupling and a thermometer.
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Fig. 2:
Okta 500 ATEX design
1 Blank flange (mounted on the vacuum flange)
7
Thermometer
2 Eye bolts
8
Fore-vacuum flange
3 Valve for inert gas filling (mounted on the measurement connection)
9
Drain screw
4 Motor (ATEX design)
10
Sight glass
5 Magnetic coupling (hidden by the lantern)
11
Filler screw
6 Sealing gas connections (4×)
12
Overflow valve
3.2 Product identification
To ensure for a clear identification of the product when communicating with Pfeiffer Vacuum, always
keep all of the information on the rating plate to hand.
The following information is shown on the rating plate:
● Pump model
● Model number
● Type and quantity of the lubricant
● Max. allowable pump rotation speed
● Date of manufacture
● Input voltage range
3.3 Scope of delivery
● Roots pump with motor / motor provided by the customer
● Connection flanges produced in accordance with PN 16
● Seal for the connection flange
● Protective cover for the connection flange
Product description
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