Universal use up to 16 bar
K series pumps are universal screw pumps, making them the most sold KRAL pump. The pump has a housing made from nodular cast iron. They are approved for use on board ships. In addition, they are equipped with sealed external bearings that are pre-lubricated for their lifetime so they are not stressed by the material being pumped and require no maintenance.
Operation, materials, components
- Delivery rate: 5 to 2,900 l/min
- Delivery rate KFT: 5 to 510 l/min
- Max. differential pressure: 16 bar
- Temperature range: -20 °C to 180 °C, magnetic coupling to 300 °C
- Housing: Nodular cast iron EN-GJS-400
- Screws: Steel, nitrided
- Approvals: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA
- ATEX: II 2 GD b/c group II, category 2
- Heating: Electrical, fluid media or steam
How the K series screw pump fits into the KRAL product program
The screw pump is available with DIN flanges in an inline configuration, and the KFT series screw pump is available with DIN flanges at the top. Various installation methods are possible for flange-mounting, pedestal and base screw pumps.
Advantages of three screw pumps
Compared to other types of pumps, KRAL screw pumps offer high capacity without taking up much space. This applies in particular at high differential pressure. The screw pumps are self-priming, with low pulsation delivery and can be easily regulated. The single screw pumps, single stations and double stations are extremely compact. All K series screw pumps have an internal safety valve.
Stop coupling damage
With some liquids, residue can build up, which may cause the pump to fail. A typical spot for residue to build up is at the mechanical seal. The residue damages the ball bearing, which runs hot, melts the elastomeric ring and damages the coupling. With the K series screw pump, there is a weep hole next to the mechanical seal, to prevent the fluid from collecting and building up as residue.
KRAL offers the advanced quality of SiC mechanical seals, which contain graphite, as a solid lubricant to reduce the coefficient of friction in dry running conditions. The O rings with high fluorine content are suitable for higher temperatures and are chemically stable. The K series screw pump offers innovative seal concepts. A proven selection of radial rotary shaft seals, mechanical seals and a hermetically sealed magnetic coupling are available as standard. A robust and compact design rounds off the profile.
- Technical data
Technical data 15-42 55-118 160-275 370-450 550-660 851-1301 1500-1700 2200-2900 Qth (1450 min-1, 0 bar) l/min 15-42 55-118 160-275 370-450 550-660 851-1301 1500-1700 2200-2900 Max. pressure at pressure flange bar K 16 16 16 16 16 16 16 16 KFT 16 16 16 Temperature °C with NBR rotary lip seal 90 90 90 90 90 90 90 90 with FKM rotary lip seal 150 150 150 150 150 150 150 150 with mechanical seal standard 150 150 150 150 150 150 150 150 with mechanical seal hard material 180 180 180 180 180 180 180 180 with magnetic coupling 300 300 300 300 300 300 300 300 Viscosity mm²/s min. 1.1 1.1 1.1 1.4 1.4 1.4 1.4 1.4 max. 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 Max. pressure at suction flange bar with rotary lip seal 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 with mechanical seal standard 6 6 6 6 6 6 6 6 with mechanical seal hard material 10 10 10 10 10 10 10 10 with magnetic coupling 10 10 10 10 10 10 10 10
- ModelsKF flange screw pump
Universal pump for horizontal installation, other mounting positions possible.KH foot screw pump
Mounted horizontal onto base frames.KV pedestal screw pump
The right choice if the installation area is narrow or if there is not enough space available.KFT screw pump with overhead DIN flanges
For horizontal or vertical installation.
- Operating instructions