{"id":1588565,"date":"2025-06-12T11:58:57","date_gmt":"2025-06-12T08:58:57","guid":{"rendered":"https:\/\/steiner.com.ua\/?post_type=product&p=1588565"},"modified":"2026-08-31T16:38:48","modified_gmt":"2026-08-31T13:38:48","slug":"kral-trygvyntovyj-nasos-c-series","status":"publish","type":"product","link":"https:\/\/steiner.com.ua\/en\/catalog\/kral-trygvyntovyj-nasos-c-series\/","title":{"rendered":"KRAL - Triple screw pump (C Series)"},"content":{"rendered":"

The KRAL C-series high-pressure pump is a self-priming triple-screw pump designed for pressures up to 100 bar. Manufacturer: KRAL, Austria. The series is divided into three sub-series: CK for simple applications with easy installation, CL for stable operation at high pressure, and CG with the widest viscosity range \u2014 up to 1,000,000 mm\u00b2\/s.<\/p>\n

What are the differences between the CK, CL and CG sub-series?<\/h2>\n

CK<\/strong> \u2014 a basic high-pressure version for various media, designed for easy installation. A pressure rating of 100 bar is available for the smallest size; for sizes ranging from 15\u201326 to 370\u2013450, the pressure rating is 70 bar, whilst for the largest sizes (550\u2013880), it is 40 bar.<\/p>\n

CL<\/strong> \u2014 Designed for consistently high pressure: 100 bar across the entire range, except for the two largest sizes, where the limit is 80 bar. A full range of seals is available, including a magnetic coupling.<\/p>\n

CG<\/strong> \u2014 the most flexible solution. The same pressure of 100 bar, but with a flow rate of up to 3,550 l\/min and a viscosity of up to 1,000,000 mm\u00b2\/s. This is the solution for very viscous fluids, which other triple-screw series cannot handle.<\/p>\n

On the principle of operation of a screw pair \u2014 how a screw pair works<\/a>.<\/p>\n

Technical specifications by sub-series<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nCK<\/th>\nCL<\/th>\nCG<\/th>\n<\/tr>\n<\/thead>\n
Qth flow rate (1450 min\u207b\u00b9, 0 bar)<\/td>\n5\u2013880 l\/min<\/td>\n5\u2013880 l\/min<\/td>\n15\u20133,550 l\/min<\/td>\n<\/tr>\n
Max. discharge pressure<\/td>\n100 bar (5\u201310) \u00b7 70 bar \u00b7 40 bar (550\u2013880)<\/td>\n100 bar \u00b7 80 bar (the two highest)<\/td>\n100 bar<\/td>\n<\/tr>\n
Maximum viscosity<\/td>\n10,000 mm\u00b2\/s<\/td>\n10,000 mm\u00b2\/s<\/td>\n1,000,000 mm\u00b2\/s<\/td>\n<\/tr>\n
Temperature, cuff seal<\/td>\n90 \/ 150 \u00b0C<\/td>\n150 \u00b0C<\/td>\n150 \u00b0C<\/td>\n<\/tr>\n
Temperature, standard end face<\/td>\n\u2014<\/td>\n150 \u00b0C<\/td>\n\u2014<\/td>\n<\/tr>\n
Temperature, end-face of solid materials<\/td>\n\u2014<\/td>\n180 \u00b0C<\/td>\n180 \u00b0C<\/td>\n<\/tr>\n
Temperature, magnetic clutch<\/td>\n\u2014<\/td>\n300 \u00b0C<\/td>\n300 \u00b0C<\/td>\n<\/tr>\n
Max. inlet pressure, gauge pressure<\/td>\n10 bar<\/td>\n10 bar<\/td>\n10 bar<\/td>\n<\/tr>\n
Max. inlet pressure, end face<\/td>\n\u2014<\/td>\n30 bar<\/td>\n30 bar<\/td>\n<\/tr>\n
Max. inlet pressure, magnetic coupling<\/td>\n\u2014<\/td>\n16 bar<\/td>\n100 bar<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The minimum viscosity for CK is 1.1 mm\u00b2\/s; for the largest size, it is 1.4 mm\u00b2\/s according to the series data sheet; the manufacturer\u2019s brochure specifies 1.5 cSt. When calculating at the limits of the range, it is advisable to use the higher value.<\/p>\n

Common to the series:<\/p>\n

\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Type<\/td>\nthree-phase, self-priming<\/td>\n<\/tr>\n
Housing material<\/td>\nspheroidal graphite cast iron, steel or aluminium<\/td>\n<\/tr>\n
Screws<\/td>\nnitrided steel<\/td>\n<\/tr>\n
Temperature range<\/td>\n\u221220\u2026180 \u00b0C \u00b7 up to 300 \u00b0C with a magnetic coupling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

What are the benefits of choosing a seal from the C series?<\/h2>\n

The C series is available in four variants: lip seal, standard face seal, face seal made from hard materials, magnetic clutch<\/a> and gland packing.<\/p>\n

This choice affects not only the temperature but also the permissible pressure at the suction flange \u2014 and this is often a decisive factor when operating against a head. A mechanical seal provides 10 bar at the inlet, a face seal 30 bar, and a magnetic coupling in the CG model 100 bar. For circuits with high supply pressure, this is the determining factor in the choice.<\/p>\n

Certificates and explosion protection<\/h2>\n

Classification societies: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA, KR.
\nExplosion protection: ATEX II 2 GD b\/c, Group II, Category 2.
\nThe manufacturer\u2019s brochure also refers to API 676, 614, 682 and 685, and EN 13445 \u2014 the specific set is confirmed upon request.<\/p>\n

A full list of models in the series can be found on the manufacturer\u2019s website KRAL<\/a>.<\/p>\n

Where are C-series pumps used?<\/h2>\n

The manufacturer lists the uses specifically as follows:<\/p>\n