GLS 250 3Ph 230/460 V 60 Hz (North American version, ANSI connections)

Atlas Copco GLS 250 – robust rotary piston pump for harsh processes

The GLS 250 delivers 234 m³/h (Pneurop 6602, displacement 255 m³/h) and reaches below 3.3 × 10⁻² mbar without gas ballast. Motor 5.5 kW (50 and 60 Hz), dimensions 667 × 581 × 1195 mm (L × W × H), weight 431 kg, inlet ASA/ANSI 3", outlet ASA/ANSI 2". The pump is water-cooled; a water-saving regulator keeps the operating temperature constant.

Proven Stokes technology

With over 10,000 units sold in 80 years, the rotary piston pump from Stokes Vacuum – now part of the Atlas Copco Group – is a standard for reliability. The low speed of around 500 rpm, the automatic lubrication and the new valve design ensure long service lives and little downtime – important in the automotive and aviation industries, for example. In combination with a ZRS booster pump, the pump reaches, according to Atlas Copco, below 3.3 × 10⁻³ mbar (GLS 250 with ZRS 500, 500 m³/h, or ZRS 1200, 1200 m³/h: in each case < 3.3 × 10⁻³ mbar).

Applications of the range

Atlas Copco lists the automotive and aerospace industries, chemical processing, heat treatment, leak detection, metallurgy, PET processing, pharmaceuticals, transformer drying and cable oil treatment, vacuum coating and vacuum melting.

Version

Ehrler & Beck lists the GLS 250 under part number 8153311348 in the version for 3Ph 230/460 V 60 Hz with ANSI flanges and NPT water connections (North American standard).

Features of the GLS range

• Robust construction of cast iron and ductile iron, few moving parts, large clearances
• Low speed (around 500 rpm) for high reliability and low life-cycle costs
• Automatic lubrication of bearings and sealing surfaces; oil solenoid valve (230/460 V coil) prevents flooding in the event of a power failure or loss of vacuum
• New valve design: valve maintenance and valve noise virtually eliminated
• Gas ballast as standard against condensation of water vapour
• Water-saving regulator for low water consumption and optimum operating temperature
• Space-saving – according to Atlas Copco up to 50 % less footprint; complete, ready-to-connect unit

Pumping speed 50Hz	234
Pumping speed 60Hz	234
Ultimate pressure	0.033
Rated motor power 50Hz	5.5
Rated motor power 60Hz	5.5
Weight	431
Length	66.7
Width	58.1
Height	119.5
Inlet connection flange	ASA/ANSI 3"
Outlet connection flange	ASA/ANSI 2"
Noise level	77 dB(A)
Cooling method	Water cooling
Oil type	V-Lube F

Additional technical data