Gear Pumps

Transfer Gear Pumps BT, BTH Construction Basic construction of BT (rear bearing cover removed) Driving shaft Shaft sealing by packed gland / Mechanical seal Stuffing-box cover Gearing with journals Transfering medium inlet or outlet Basic construction of BTH (rear bearing cover removed) Heating liquid outlet Housing Heating chamber Driving shaft Shaft sealing by packed gland Pumping chamber Stuffing-box cover Gearing with journals Transfering medium inlet or outlet Heating liquid inlet (left or right optional)

Function Pumps series BT and BTH are low speed gear pumps for transfering medium and high viscosity fluids, provided they have certain minimum amount of lubricating property, do not contain any solids and are chemically compatable with the materials of construction. The standard material of construction for housing, bearing cover and stuffing box cover is grey cast iron. The shafts and gears are manufactured from case hardening steel, hardened and ground. The shafts are carried in plain bearings manufactured in bronze, with an option of sintered iron. The rotary shaft seal is a packed gland consisting...

General Characteristics Fixing type Foot mounting Pipe connection BT: Whitworth-Pipe thread BTH : Whitworth-Pipe thread flange, flange with counterflange BT = clockwise and anticlockwise BTH = clockwise or anticlockwise Fitting position Ambient temperature Operating Characteristics Operating pressure Inlet port Outlet port * max. pressure in the heating jacket Temperature range Viscosity range = 30 000 mm 2/s Viscosities other than within this range on request Discharge flow Power input speeds see table page 9, 10 nmin nmax Suitable Fluids Lubricating-, Cutting oils Soluble-, Steel hardening-,...

. Code-No. for special construction 04 Wear and corrosion protected model Kind of sealing (Packing) 51 Arolan Construction of gear unit C Steel shafts and gear unhardened K Steel shafts and gear hardened F Steel shafts and gear hardened S Stainless steel shaft (material No. 1.4057) bronze gear T Stainless steel shafts and gear heat treated (material No. 1.4057) Construction of housing and friction bearing A Cast iron without bearing bush B Cast iron with Bz bearing bush C Iron bearing bush U Bronze without bearing bush R Stainless steel with carbon-bearing bush (mat. No. 1.4308) Design code Pipe...

Identification in accordance with EC Directive RL 94/9/EG Gear Pumps BT – ATEX Pumps of the series BT are also available in ATEX design. The pumps can be used as follows: Kracht GmbH 58791 Werdohl, Germany Type designation: a. In Zone 2 (Gas- , Category 3G) in explosion groups IIA and IIB and IIC Job No., Production Date: xxxxxx/xx-xxx xx.xx Tech. File Ref.: b. In Zone 1 (Gas- , Category 2G) in explosion groups IIA and IIB and IIC Ignition protection designation: Qualification with regard to surface temperature is T4. For all gases, vapours, mists with an ignition temperature > 135 °C, the pumps...

Gear Pumps BT – ATEX General Characteristics Design External gear pump Pipe connection Fixing type Foot mounting Ambient temperature Filter fineness 60 µm (If required, install a suction filter to prevent the pump from being jammed by foreign particles). Whitworth-Pipe thread Mounting position Permissible media Inflammable and non-inflammable liquids without abrasive ingredients which are compatible with the materials of which the pump is made. The liquid must not be static charged. Flame point and minimum ignition temperature must be observed by the operator. Media-specific characteristics must...

Seals 59 Mechanical seal with liquid seal Shaft seal: FKM 76 Mechanical seal with liquid seal Shaft seal: PTFE 97 Double-acting mechanical seal with sealing liquid (available from size 4) Construction of gear unit K Steel shafts and gear hardened Construction of housing and friction bearing B Cast iron with Bz bearing bush Design code 0 (specified by KRACHT) Pipe connection Z Whitworth pipe thread Direction of rotation B Clockwise and anticlockwise Series Product code BT (without heating jacket) KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · Phone +49 23 92.935-0 · Fax +49 23 92.935...

Power Consumption n = 100 1/min Pump type Viscosity ν (mm2/s) 76 760 3800 7600 required power input P (kW) Viscosity ν (mm2/s) 76 760 3800 7600 required power input P (kW) Viscosity ν (mm2/s) 76 760 3800 7600 required power input P (kW) Power input required at high viscosities Viscosities above values specified in the table require a higher power input. In such cases the power input of the pump P1Pu can be determined by means of the viscosity factor fν (see table page 10) as follows: Example: BT 4 n = 200 1/min; ν = 10 000 mm2/s; p = 8 bar with Ptab 76 = 0.6 kW, table data at ν = 76 mm2/s fν...

Power Consumption n = 400 1/min Pump type Viscosity ν (mm2/s) 76 760 3800 req. power input P (kW) Viscosity ν (mm2/s) 76 760 3800 req. power input P (kW) Viscosity ν (mm2/s) 76 760 3000 req. power input P (kW) Viscosity factor fν 10-3 kW min/l Spread of output: ± 5 % of table values Q. Viscosities below 76 mm2/s effect a decrease of output flow values, Q. The power output of driving motor must exceed the table values P by about 20 %. Important: When determining the power input required always consider the max. operating viscosity. (e. g. in the starting situation) ! KRACHT GmbH · Gewerbestr....

Groove for retaining ring acc. to standard DIN 471 Pump type Inlet and outlet ports equally sized. KRACHT GmbH · Gewerbestr. 20 · 58791 Werdohl, Germany · Phone +49 23 92.935-0 · Fax +49 23 92.935 209 · Email [email protected]

• Z 0 • K 51 Outlet port for heating liquids ** Inlet port for heating liquids Clockwise or anticlockwise by choice unused connection is to be sealed • F 0 • K 51 Outlet port for heating liquids ** Parallel key acc. to DIN 6885 Inlet port for heating liquids Clockwise or anticlockwise by choice unused connection is to be sealed • G 0 • K 51 Outlet port for heating liquids ** Counterflange: Flange C 15 x 21.3 DIN 2633 approx. Weight (kg) 1/ 55 = 45 kg BTH 1/105 Z; F= 46 kg 1/ 55 = 48 kg BTH 1/105 G = 49 kg ** Clockwise or anticlockwise by choice unused connection is to be sealed Parallel key acc....