{"id":1588594,"date":"2025-06-13T17:36:47","date_gmt":"2025-06-13T14:36:47","guid":{"rendered":"https:\/\/steiner.com.ua\/?post_type=product&p=1588594"},"modified":"2026-08-25T17:20:30","modified_gmt":"2026-08-25T14:20:30","slug":"kral-trygvyntovyj-nasos-g-series","status":"publish","type":"product","link":"https:\/\/steiner.com.ua\/en\/catalog\/kral-trygvyntovyj-nasos-g-series\/","title":{"rendered":"KRAL - Triple screw pump (G Series)"},"content":{"rendered":"

The KRAL G Series three-screw pump is a compact unit for the lubrication systems of rotating machinery: compressors, gearboxes and turbines. Manufacturer \u2014 KRAL, Austria. The series is built on a modular principle: a single frame size covers different connection, sealing and mounting options without any change to the hydraulics.<\/p>\n

\u00a0How a three-screw pump works<\/strong><\/h2>\n

The working element consists of a drive screw and two idler screws. They form closed chambers that travel from inlet to outlet at constant volume. Hence the even, virtually pulsation-free delivery, low noise level and absence of any churning of the liquid inside the pump.<\/p>\n

Internal hydraulic balancing relieves axial forces, so the bearings operate under gentle conditions. The screws are made of nitrided steel: the surface hardness maintains the working clearance over long service, and the unit's life is determined mainly by oil cleanliness.<\/p>\n

More about the operating principle \u2014 in the article Features of screw pumps<\/a>.<\/p>\n

KRAL G Series technical specifications<\/strong><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Capacity<\/td>\n5\u2013660 l\/min (6 frame sizes)<\/td>\n<\/tr>\n
Max. differential pressure<\/td>\n25 bar<\/td>\n<\/tr>\n
Operating viscosity<\/td>\n10\u2013500 mm\u00b2\/s<\/td>\n<\/tr>\n
Cold start<\/td>\nup to 1200 mm\u00b2\/s<\/td>\n<\/tr>\n
Fluid temperature<\/td>\n\u221210\u2026+120 \u00b0C (mechanical seal) \u00b7 up to +300 \u00b0C (magnetic coupling)<\/td>\n<\/tr>\n
Inlet pressure<\/td>\nup to 6 bar (mechanical seal) \u00b7 up to 16 bar (magnetic coupling)<\/td>\n<\/tr>\n
Housing material<\/td>\nhigh-strength cast iron EN-GJS-400 or steel<\/td>\n<\/tr>\n
Screws<\/td>\nnitrided steel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Versions and options<\/strong><\/h2>\n

The casing, suction cover and flange covers rotate in 90\u00b0 steps, so the inlet can be made axial or radial right at installation.<\/p>\n