spotting drills

NWZ/PE NT water pipeline spotting drill for PVC and PE pipes with replaceable stem

  • Type 1600
  • Working pressure PN16
  • Gate valve ductile iron GJS 500-7
  • Clamp ductile cast iron GJS 500-7
  • Diameters DN90 – DN315
  • Outlets 25mm, 32mm, 40mm, 50mm
  • Temp. max. 40°C – for water

NWZ water pipeline spotting drill with replaceable stem sealing for PVC and PE pipes used mainly in water supply systems to drill under pressure with drilling jig and coated with top quality epoxy resin anti-corrosion coatings.


National Hygiene Institute Warsaw.


Threaded connection acc. to PN-EN 228-1.
Requirements and tests according to PN-EN 1074 – 1 and 2


  • Drilling under pressure using a drilling machine.
  • Integrated with a gate valve cat.-no 2655, 2665, 2675. 2655, 2665,2675.
  • Outlets with threads G 1″, G 1 1/4″, G 1 1/2″ and G 2″.
  • Can be assembled on PVC and PE pipes.
  • Full, smooth, equal-flow and cavity-free passage.
  • The valve stem sealing may be replaced under full pressure in any position of the wedge.
  • A stainless steel stem with cold rolled thread, without notches in the sealing zone, which makes it possible to work with o-rings placed in the screw.
  • Triple sealing system of the stem: top seal, set of 5 o-rings (4 o-rings inside and outside the screw), bottom seal, lip seal.
  • Gate body, bonnet and wedge made of ductile cast iron EN-GJS 500-7 grade.
  • Foot with internal thread and clamp made of ductile cast iron EN-GJS 500-7 lined with rubber.
  • Wedge suspension nut on the stem – non-replaceable, made of brass, hot-dipped in the wedge of the gate valve.
  • Wedge made of spheroidal cast iron, vulcanized inside and outside with EPDM rubber with hardness of 70±5°Sh.
  • Bolts connecting the cover to the body – blind threads, fully protected against corrosion with paraffin-wax compound.
  • Internal and external corrosion protection by epoxy powder paint RAL 5005 with a thickness of min. Epoxy powder paint RAL 5005 with minimum thickness 250μm and 3kV resistance.