The example shows an NK 80-160 with 164 mm impeller, made of cast iron, with GQQE shaft seal, standard coupling and a 2-pole motor. The example shows an NKG Original installation and operating instructions. CONTENTS. Page. 1. Symbols used in this document. 2. General information. NK, NKG are non-self-priming, Page 9: Start-Up Note: A non-return valve must be fitted to the inlet pipe. Starting up the pump See also installation and operating instructions for NK, NKGNK, NKG. High Temperature. Installation and operating instructions. GRUNDFOS INSTRUCTIONS NK, NKG pumps with Cartex DE shaft seal are recommended for:. Notes or instructions that make the job easier and ensure safe operation. 2. General information. NK, NKG are non-self-priming, single stage, centrifugal volute. These installation and operating instructions describe ATEX-approved Grundfos NK, NKG pumps and NK, NKG bare-shaft pumps. Sections 1-5 provide important View and Download Grundfos NK Series installation and operating instructions manual online. ATEX-approved pumps. NK Series water pump pdf manual download. Original installation and operating instructions. These installation and operating instructions describe ATEX-approved Grundfos NK, NKG pumps.