U 4.20

Becker U 4.20 – oil-lubricated rotary vane vacuum pump

The U 4.20 delivers 18 m³/h at 50 Hz and 21 m³/h at 60 Hz (tolerance ±5 %) and reaches an ultimate pressure below 1 mbar at 50 Hz or below 1.5 mbar at 60 Hz. Three-phase motor 0.55 / 0.66 kW at 50 / 60 Hz (motor number 4141725340398), single-phase motor 230 V with 0.60 / 0.72 kW (motor number 4152722740398, capacitor 30 µF). Sound pressure level 63 / 67 dB(A) at 50 / 60 Hz. Weight approx. 20 kg, dimensions 334 × 250 × 227 mm. Suction connection G 1/2" with integrated non-return valve, exhaust connection G 3/4"; oil filling 0.5 l (Becker Lube M 100, S 100 or SL 100). Becker lists a gas ballast valve and an external inlet filter as options. Data according to the Becker data sheet of 30.08.2017.

Availability

The U 4.20 is no longer in the international Becker product range catalogue 01/2026, and its data sheet is in the archive of the Becker download centre. Becker Pumps in the USA still lists it in its U series (as of October 2026). Ehrler & Beck checks availability on request. Alternatives in the current Becker range are the Becker O 5.16 (XL) with 16 m³/h and the Becker O 5.21 (XL) with 23.5 m³/h at 50 Hz; both reach an ultimate pressure of 2 mbar.

Advice and service

Ehrler & Beck supports you in the selection, supplies oil, filters and spare parts and carries out maintenance and repair.

Pumping speed 50Hz	18
Pumping speed 60Hz	21
Ultimate pressure	1
Rated motor power 50Hz	0.55
Rated motor power 60Hz	0.66
Weight	20
Length	33.4
Width	25
Height	22.7
Inlet connection flange	G 1/2"
Outlet connection flange	G 3/4"
Noise level	63 dB(A)
Cooling method	Air cooling