Leybold 960 250 SOGEVAC SV 25 B Vacuum Pump

Name: Leybold 960 250 SOGEVAC SV 25 B Vacuum Pump | Seven Star LLC
Brand: Leybold
SKU: 960 250

A compact 26 m3/h rotary vane pump for rough vacuum duty

The Leybold 960 250 is the SOGEVAC SV 25 B fitted with a three-phase motor and no gas ballast valve. Its nominal pumping speed is 26.0 m3/h (15.3 cfm) at 50 Hz and 31.0 m3/h (18.3 cfm) at 60 Hz, from a 0.9 kW motor. The oil-sealed single-stage vane design is meant for continuous running from atmospheric pressure down to the ultimate pressure, so it suits small furnaces, packaging machines, degassing stations and as a backing pump behind a Roots blower.

Part numbers in this family differ by motor, gas ballast and flange thread rather than by size, which makes the code important: 960 250 is the plain three-phase pump for dry gases, while 960 251 adds a permanent gas ballast for vapour duty. A pump on an order list that only says SV 25 B can therefore be any of six different codes.

Technical specification from the Leybold catalogue

Parameter	Specification
Part number / type	960 250 / SOGEVAC SV 25 B, three-phase motor, without gas ballast
Motor voltage on this code	200-240 / 346-415 V at 50 Hz and 200-277 / 346-480 V at 60 Hz (CEI wide-range motor)
Nominal pumping speed	26.0 m3/h (15.3 cfm) at 50 Hz; 31.0 m3/h (18.3 cfm) at 60 Hz
Pumping speed (DIN 28 400)	22.5 m3/h (13.3 cfm) at 50 Hz; 25.0 m3/h (14.7 cfm) at 60 Hz
Ultimate total pressure, without gas ballast	0.5 mbar or less (0.4 Torr or less)
Ultimate total pressure, with gas ballast	0.8 mbar or less (0.6 Torr or less), for variants that carry a ballast
Water vapour tolerance	10.0 mbar (7.5 Torr)
Water vapour capacity	85 g/h at 50 Hz; 100 g/h at 60 Hz
Oil capacity	0.5 l (0.53 qt)
Noise level	64 dB(A) at 50 Hz; 67 dB(A) at 60 Hz, free field at 1 m, at ultimate pressure without gas ballast
Motor power / speed	0.9 kW (1.2 hp) at 3000 rpm for 50 Hz; 1.1 kW (1.5 hp) at 3600 rpm for 60 Hz
Protection	IP 55-F
Admissible ambient temperature	12 to 40 degrees C (54 to 104 degrees F)
Weight with oil	26 kg (57.4 lbs) three-phase; 27 kg (60.0 lbs) for the single-phase versions
Dimensions L x W x H	315 x 281 x 199 mm (12.4 x 11.06 x 7.83 in)
Connections	Intake 3/4 inch plus 1/2 inch adapter supplied; exhaust 3/4 inch; G thread on European and Japanese motors, NPT on NEMA versions
Materials in contact with gas	Steel, cast iron, aluminium, bronze, FPM (FKM), glass, polyamide 6.6, filter material, epoxy resin and glass fibre

Which SV 25 B code to order

The ordering table of the catalogue lists the complete SV 25 B group. Pick by motor supply first, then by whether condensable vapours are present.

Part No.	Motor	Gas ballast	Note
960 250	Three-phase, 200-240/346-415 V 50 Hz and 200-277/346-480 V 60 Hz	None	This page
960 251	Three-phase, same wide range	Permanent	For vapour duty
960 253	Three-phase, same wide range	Permanent	NPT flanges
960 255	Single-phase 230 V, 50/60 Hz	None
960 256	Single-phase 230 V, 50/60 Hz	Permanent
960 257	Single-phase 230 V, 50/60 Hz	Permanent	NPT flanges

Versions for 110-120 V at 60 Hz, 100 V at 50/60 Hz, other voltages and special oil fillings are listed as upon request, and the catalogue asks that the choice is stated when ordering. The three-phase motor on 960 250 covers both 50 Hz and 60 Hz networks, which is useful when the pump is bought for a skid that will be shipped between sites.

Operation and installation points printed in the catalogue

The oil circuit is rated for continuous operation at high intake pressure, up to 1000 mbar absolute, so the pump can start at atmosphere and run as a general rough vacuum source.
An anti-suckback valve with a metal wire-mesh filter closes the intake when the pump stops; it works below 800 mbar even with the gas ballast open and prevents oil from being drawn back into the vacuum system.
An integrated exhaust filter with an oil return line holds the oil mist; the catalogue states a separation efficiency above 99.9 percent, so the exhaust gas is free of oil mist.
SV 10 B to SV 65 B pumps are delivered with the oil in a separate canister, unlike the SV 100 B and larger pumps which are shipped filled. Fill the 0.5 l before the first start.
Admissible ambient temperature is 12 to 40 degrees C, and the dimensional drawing asks for free space at the exhaust filter and at the motor fan for cooling and filter change.

Applications in industrial plants

Typical uses printed for the SOGEVAC range include furnaces and plants, packaging, the food industry, metallurgy, power engineering, laser and medical technology. For an Omani or GCC site, a pump of this size fits laboratory degassing, small impregnation or drying chambers, vacuum holding fixtures and the backing line of an analytical instrument. Keep the cooling air path clear in a hot plant room: the 40 degrees C ceiling applies to the surrounding air, not to the cabinet temperature after a long summer day.

Accessories and spare parts

Item	Part No.
Exhaust filter cartridge AFE SV25B	714 16 340
Maintenance kit	971 423 450
Repair kit	971 423 100
Seal kit FPM (FKM)	714 19 490

For larger duty the same SOGEVAC B family continues with the SV 40 B, SV 65 B and SV 100 B. Ask for a quotation quoting the full code 960 250, and we will check motor supply, thread type and gas ballast against your duty first. The pumps category lists related equipment.

Frequently asked questions

What is Leybold 960 250?

It is the part number for the SOGEVAC SV 25 B oil-sealed rotary vane pump with a three-phase motor and no gas ballast, nominal 26.0 m3/h at 50 Hz.

Which voltages does the motor accept?

The catalogue lists 200-240/346-415 V at 50 Hz and 200-277/346-480 V at 60 Hz for the CEI three-phase motor on this code.

What ultimate pressure does it reach?

The ultimate total pressure without gas ballast is 0.5 mbar or less. A variant with gas ballast is listed at 0.8 mbar or less.

Is the oil included in the delivery?

The catalogue states that SV 10 B to SV 65 B pumps are delivered with the required oil quantity in a separate canister, 0.5 l for this model.

Does Seven Star LLC build this pump?

No. Seven Star LLC is an independent supplier based in Muscat, and a requested code is checked with you before any order.

Leybold is a German vacuum technology company, founded in Cologne in 1850 by Ernst Leybold and part of the Atlas Copco Group since 2016. Its catalogue covers oil-sealed rotary vane pumps, two-stage pumps and screw vacuum pumps for industrial and laboratory processes.

Oil-sealed vacuum pumps

The range includes SOGEVAC single-stage rotary vane pumps, NEO D and TRIVAC two-stage pumps and VACUBE variable-speed screw pumps, with ATEX versions for areas where explosive gases can occur.

Industries served

Leybold lists coating, packaging, food processing, metallurgy, power engineering, chemistry and analytical applications among the uses of its pumps.

Supply from Muscat

Seven Star LLC supplies selected Leybold pumps to industrial customers in Oman and the GCC, with the official catalogue pages attached to each product page.

Frequently Asked Questions