Vacuum Catalogue - Edwards

Stokes 61B Series By-Pass Mechanical Booster PumpsStokes 61B by-pass mechanical boosters are designed to be used in conjunction withrotary-piston, dry vacuum, rotary vane and liquid ring pumps to increase pumping speed atworking pressures and shorten pump down time significantly. The Stokes 61B by-passboosters include an integral by-pass valve enabling the booster to start from atmosphere,eliminating the need for a vacuum pressure switch and ensures continuous operationregardless of vacuum level. The Stokes 61B can be mounted separately or on the inlet ofthe backing pump to create a compact integrated package.Features & BenefitsTechnical Data●●●●●Mechanical shaft seal – improved life and serviceabilityRingfeder® keyless gear locking system – stronger, faster timingLarge shaft diameters – allowing improved performance at highpressuresBelt drive or direct drive capabilityVertical or horizontal gas flowDisplacementV belt (2750 rpm) 3375m 3 h -1 / 2000ft 3 min -1Direct drive (1800 rpm) 2210m 3 h -1 / 1300ft 3 min -1Direct drive (3000 rpm) 3685m 3 h -1 / 2170ft 3 min -1Direct drive (3600 rpm) 4420m 3 h -1 / 2600ft 3 min -1Inlet/outlet flanges8” ASA/ANSI flangeMotor power EU/Asia18.5kWMotor power US TEFC 10/25hpBy-pass availableYesCooling methodAir cooledOil capacity (horizontal flow) 1.9 litre / 0.51galOil capacity (vertical flow) 4.1 litre / 1.1galMax temp rise 135°C / 275°FMax discharge temp 191°C / 375°FWeight bare shaft284kg / 625lbsWeight TEFC direct drive 530kg / 1170lbs8Page369DimensionsOrdering InformationProduct Description61B MHR CE, 18.5kW, 400V, 3-ph, 50Hz @ 3000rpm61B MHR CE, 18.5kW, 200-220/380V, 3-ph, 50/60Hz @3000/3600rpm61B MH10, 10hp, 230/460V, 3-ph, 60Hz @ 1800rpm61B MH25, 25hp, 230/460V, 3-ph, 60Hz @ 3600rpm61B MHR (Bare shaft) Horizontal flow61B MV10, 10hp, 230/460V, 3-ph, 60Hz @ 1800rpm61B MV25, 25hp, 230/460V, 3-ph, 60Hz @ 3600rpm61B MVR (bare shaft) Vertical flowOrder No.90061BMHR60190061BMHR60290061BMH1090061BMH2590061BMHR90061BMV1090061BMV2590061BMVR61B MVR CE, 18.5kW, 400V, 3-ph, 50Hz @ 3000rpm90061BMVR60161B MVR CE, 18.5kW, 200-220/380V, 3-ph, 50/60Hz @3000/3600rpm90061BMVR602Accessories & SparesOrder No.Replacement 6" booster Mseal - seal kit 607552001Replacement 6" booster - maintenance kit 607552002A 8'' pipe flange connection 13 1/2'' (343 mm) OD x 8'' (203 mm) ID 8 x 3/4-10 NC-2B x 1 1/8'' (29 mm)holes straddle both CL both flangesB DIA. Holes1. STD Inlet 2. Optional feetShop online at www.edwardsvacuum.com