{"id":1588573,"date":"2025-06-12T14:44:21","date_gmt":"2025-06-12T11:44:21","guid":{"rendered":"https:\/\/steiner.com.ua\/?post_type=product&p=1588573"},"modified":"2026-08-31T14:29:11","modified_gmt":"2026-08-31T11:29:11","slug":"kral-trygvyntovyj-nasos-z-magnitnoyu-muftoyu","status":"publish","type":"product","link":"https:\/\/steiner.com.ua\/en\/catalog\/kral-trygvyntovyj-nasos-z-magnitnoyu-muftoyu\/","title":{"rendered":"KRAL - Three screw pump with magnetic coupling"},"content":{"rendered":"

A pump with a magnetic coupling is a design in which torque is transmitted from the motor to the impellers via a magnetic field, without a shaft passing through the casing. There is no mechanical seal, and therefore no point through which the fluid can escape. KRAL offers magnetic drive pumps for the K, L, C, F and W series, as well as for single and twin pump stations.<\/p>\n

How does a magnetic coupling work, and why is there no leakage?<\/h2>\n

The outer rotor, with permanent magnets, is mounted on the motor shaft, whilst the inner rotor is mounted on the pump shaft. Between them is a sleeve made of non-magnetic stainless steel, which hermetically seals the flow path. The magnetic field passes through the sleeve, torque is transmitted, and the fluid remains sealed inside.<\/p>\n

There are three practical implications. No mechanical seal means no more of the most common cause of unscheduled downtime. No contact between the rotors means no friction or wear in this assembly. No air can reach the product, so substances that oxidise or crystallise when exposed to oxygen retain their properties.<\/p>\n

The screw pair itself operates in the same way as in the standard version \u2014 how a screw pair works<\/a>.<\/p>\n

For which KRAL series is the version with a magnetic clutch available?<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
The series<\/th>\nModels with a magnetic clutch<\/th>\n<\/tr>\n<\/thead>\n
KRAL K Series<\/a><\/td>\nKF, KV, KFT<\/td>\n<\/tr>\n
KRAL L Series<\/a><\/td>\nLFT, LVI, LVT, LFI<\/td>\n<\/tr>\n
KRAL C Series<\/a><\/td>\nCGF, CG, CL<\/td>\n<\/tr>\n
KRAL F Series<\/a><\/td>\nstandard magnetic clutch<\/td>\n<\/tr>\n
KRAL W Series<\/a><\/td>\nmagnetic clutch (optional)<\/td>\n<\/tr>\n
EK \/ EL stations<\/a><\/td>\nEKL\/EKS 11\u201314, ELL\/ELS 11\u201314<\/td>\n<\/tr>\n
Twin DKC \/ DLC \/ DS-L stations<\/a><\/td>\nDKC, DLC, DS1, DS3, DS4, DL2, DL3, DL4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Technical specifications by series<\/h2>\n

The operating limits for models with a magnetic coupling are determined by the basic series, not by the coupling itself. Consequently, there is no single table covering all series \u2014 the data below is taken from the manufacturer\u2019s documentation, with the source cited.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
The series<\/th>\nCapacity<\/th>\nPressure<\/th>\nTemperature<\/th>\nViscosity<\/th>\nSource<\/th>\n<\/tr>\n<\/thead>\n
K<\/td>\n5\u2013668 l\/min<\/td>\n16 bar<\/td>\nup to 300 \u00b0C<\/td>\n2\u201310,000 mm\u00b2\/s<\/td>\nthe table on the \u2018with magnetic clutch\u2019 page<\/td>\n<\/tr>\n
L<\/td>\nnot specified separately<\/td>\nnot listed separately<\/td>\nnot specified separately<\/td>\nnot specified separately<\/td>\nThe page lists only the models<\/td>\n<\/tr>\n
C (CG)<\/td>\n15\u20133,550 l\/min<\/td>\nup to 40 bar with a relief valve; up to 100 bar with a steel casing<\/td>\n180 \u00b0C standard coupling \u00b7 250 \u00b0C high-temperature coupling<\/td>\n3\u20137,000 mm\u00b2\/s<\/td>\nCG manufacturer\u2019s instructions<\/td>\n<\/tr>\n
F<\/td>\n25\u2013180 l\/min<\/td>\n120 bar<\/td>\n\u221240\u2026+300 \u00b0C<\/td>\n0.2\u2013500 mm\u00b2\/s<\/td>\nF series page<\/td>\n<\/tr>\n
W<\/td>\n15\u2013118 litres per minute<\/td>\n120 bar<\/td>\nup to 300 \u00b0C<\/td>\n1\u2013100,000 mm\u00b2\/s<\/td>\nW series page<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Materials according to the manufacturer: housing \u2014 high-strength EN-GJS-400 cast iron, steel or aluminium; screws \u2014 nitrided steel; coupling sleeve \u2014 non-magnetic stainless steel. In the F series, the wetted parts are made of stainless steel.<\/p>\n

K-series size range with magnetic coupling<\/h4>\n
\n\n\n\n\n\n\n\n\n\n
Size<\/th>\nQth flow rate (1450 min\u207b\u00b9, 0 bar)<\/th>\nPressure<\/th>\nInlet pressure<\/th>\nFrequency: 50 Hz<\/th>\n60 Hz<\/th>\n<\/tr>\n<\/thead>\n
5-42<\/td>\n5\u201343 l\/min<\/td>\n16 bar<\/td>\n16 bar<\/td>\n2,900 rpm<\/td>\nup to 3,500 min\u207b\u00b9<\/td>\n<\/tr>\n
55-118<\/td>\n59\u2013119 litres per minute<\/td>\n16 bar<\/td>\n16 bar<\/td>\n2,900 rpm<\/td>\nup to 3,500 min\u207b\u00b9<\/td>\n<\/tr>\n
160-275<\/td>\n166\u2013282 l\/min<\/td>\n16 bar<\/td>\n16 bar<\/td>\n2,900 rpm<\/td>\nup to 3,500 min\u207b\u00b9<\/td>\n<\/tr>\n
370-450<\/td>\n368\u2013448 litres per minute<\/td>\n16 bar<\/td>\n16 bar<\/td>\n2,900 rpm<\/td>\nup to 3,500 min\u207b\u00b9<\/td>\n<\/tr>\n
550-660<\/td>\n543\u2013668 litres per minute<\/td>\n16 bar<\/td>\n16 bar<\/td>\n1,450 rpm<\/td>\nup to 1,750 min\u207b\u00b9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

For the entire range: temperatures up to 300 \u00b0C, viscosity 2\u201310,000 mm\u00b2\/s.<\/p>\n

Up to what temperature does a magnetic coupling pump operate?<\/h2>\n

The answer depends on the design of the coupling, and the manufacturer\u2019s documentation specifies different limits.<\/p>\n