Gear Pumps Gear Pumps

Construction / Function / Working notes / Product features Valve options Shaft seals Variants / Options Direction of rotation and flow Technical data / Type key KF 2.5 ... 630 without valve / with D-valve / with T-valve Technical data / Type key 2.5 ... 112 with universal valve U / U2 Sealing types Special numbers Operating characteristics / Differential pressure Characteristics shaft seals / Permissible temperatures Technical data (discharge flow / input power) Calculation of input power ATEX versions Dimensions / Weights – Pumps without / with D-valve Dimensions / Weights – Pumps with mounting...

1 End cover 2 Plain bearing bushes 3 Gear unit 4 Housing 5 Shaft seal 6 Drive shaft end KF series gear pumps are external gear pumps that operate according to the positive displacement principle. Here, the fluid is transported from the suction to the discharge end by rotation of the two gear shafts in the tooth gaps along the housing wall. The geometric displacement volume Vg is displaced per wheel revolution. A value that is stated in technical documentation as the nominal volume Vgn to identify the pump size. Gear pumps are in principle self-priming - extremely high viscosities may require...

Valve options I Valves that can be attached to gear pumps Pressure relief valves D15/D25 Gear pumps of the KF series can optionally be equipped with a directly controlled pressure relief valve (D-valve D15/D25) to protect the pump from impermissibly high-pressure peaks. The valve has an adjustment facility within the permitted pressure range and is designed for a brief overflow of the discharge flow. Special pressure relief and pressure control valves (SPV, DV B, DV R, T) with an external outflow are available for permanent discharge of a volume flow. The KF gear pumps can be optionally equipped...

Single radial lip-type seal Single radial lip-type seal with outboard bearing Double radial lip-type seal with connection possibility for quench Example: for the absorption of radial forces Example: for crystallising media Sealing materials: NBR = Sealing type 1 FKM = Sealing type 2 PTFE = Sealing type 3 Sealing materials: NBR = Sealing type 19 FKM = Sealing type 7 PTFE = Sealing type 4 EPDM = Sealing type 32 Double radial lip-type seal for vacuum operation with connection possibility for quench Mechanical seal Mechanical seal and connection possibility for quench Example: for vacuum applications...

Variants / Options I Noise optimized for medias with increased air percentage The noise optimized pumps in the KF series are available from nominal size 4 and are designed for conveying for medias with increased air content. Special measures prevent the otherwise normally increased noise present in auriferous gear oil. The noise levels do not exceed or only barely exceed the measurements with non-auriferous oils. Also, there is no noise spectrum shift to higher, unpleasant frequencies. In applications without auriferous portions in the media, it is not recommended to use this version as it will...

Direction of rotation and flow I Gear pump without valve when looking at the pump shaft end, the direction of pumping is from left to right if the shaft rotates clockwise. when looking at the pump shaft end, the direction of pumping is from right to left if the shaft rotates counterclockwise. Suction side Suction side Pressure side Pressure side I Gear pump without valve / Direction of rotation B Direction of rotation right and left, direction of flow changing, without valve option I Gear pump with pressure relief valve when looking at the pump shaft end, the direction of pumping is from left...

Direction of rotation and flow I Gear pump with T-valve Pump running cw Pressure side Pressure side Tank connection Tank connection Suction side Suction side I Gear pump with U / U2 valve Direction of rotation right and left, direction of flow constant Universal valve U for KF 2.5 … 25 Pump right / left running Pump right / left running Pressure side Pressure side Suction side Suction side

Technical data KF 2.5 … 630 without valve / with D-valve / with T-valve I Materials Housing pump Grey cast iron – EN-GJL-250 (GG 25) Spheroidal cast iron – EN-GJS-400-15 (GGG 40) Housing D-valve Grey cast iron – EN-GJL-250 (GG 25) Spheroidal cast iron – EN-GJS-400-15 (GGG 40) Housing T-valve Spheroidal cast iron – EN-GJS-400-15 (GGG 40) Plain bearing bushes Standard: Multi-layer plain bearing Optional: Plastic plain bearing White metal bearing bushes Shaft seals Single radial lip-type seal, double radial lip-type seal, mechanical seal, magnetic coupling Sealing materials NBR, FKM, PTFE, EPDM,...

Type key KF 2.5 … 630 without valve / with D-valve / with T-valve I Type key KF 1 1 Product 2 Nominal size 2.5 · 4 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 25 · 32 · 40 · 50 · 63 · 80 · 100 · 112 · 125 · 150 · 180 · 200 · 250 · 315 · 400 · 500 · 630 3 Direction of rotation R right L left B right and left (only possible without valve) 4 Mounting F DIN flange without outboard bearing G DIN flange with outboard bearing W Mounting angle without outboard bearing (KF 2.5 … 200) X Mounting angle with outboard bearing (KF 2.5 … 200) 5 Sealing types See table sealing types (page 14) 6 Special number See table...

Technical data KF 2.5 … 112 with universal valve U / U2 I Materials Housing pump Grey cast iron – EN-GJL-250 (GG 25) Spheroidal cast iron – EN-GJS-400-15 (GGG 40) Housing valve Spheroidal cast iron – EN-GJS-400-15 (GGG 40) Plain bearing bushes Standard: Multi-layer plain bearing Optional: Plastic plain bearing White metal bearing bushes Shaft seals Single radial lip-type seal, double radial lip-type seal, mechanical seal, magnetic coupling Sealing materials NBR, FKM, PTFE, EPDM, FKM low temperature, HNBR, CR (other sealing materials on request) Corrosion protection Standard painting C2m - RAL...