10
Product description
4.2
Function
The water cooled rotary vane pumps of the UnoLine
Plus series are fitted with an op-
erating fluid collecting vessel with return line which ensures constant and slow circulation
of the operating fluid. Condensates, dirt and other particles are separated from the oper-
ating fluid and deposited in the sump of the vessel. This system provides the pumps with
a very large supply of operating fluid (BA 251 approx. 17 l, BA 501 approx. 45 l).
The spring loaded pump valves are of wear-resistant stainless steel. The pump is "V" belt
driven. Pump and motor are mounted together in a base frame.
A cooling water controller regulates, contingent on the pump temperature, the cooling
water flow level so that the pump operating temperature is maintained.
Fig. 2:
Rotary Vane Pump BA 251 / BA 501
Range of application
Being of a robust design, the pumps are especially suitable for vacuum generation in in-
dustrial applications. The pumps can be used as stand-alone units or as the pre-stage to
roots pumps.
1
Operating fluid collecting vessel
with return line
5
Gas ballast valve
17
Connection (G1/2") for external
oil filter (optional)
34
Level switch connection
39
Oiler
40
Sight glass
41
Cooling water controller
43
Motor
50
Venting or measuring
connection
53
Temperature sensor
62
Cooling water drain
90
Operating fluid and
condensate drain valve
91
Operating fluid filler screw (G 1")
98
Vacuum connection
99
Exhaust connection
100 Needle valve
50
98 100
40 34
91
99
1
53
5
62
41
43
39
90
17
