Flat lapping (polishing) machine


  • machine is designed for lapping (polishing) of the flat sealing surfaces of the gate valve wedges, valve spools, and сhristmas-tree wedges; 
  • special-configuration is used for lapping the end-seal rings.

Types of machined parts

  • wedges of the gate and christmas-tree valves; 
  • valve (global valve) spools; 
  • end-seal rings of the pumps; 
  • other flat-surface parts.

Lapping-plate diameter

  • Ø 620 mm (24″). For the wedges of the gate valves DN 50…150 mm (2...6″).



Nominal diameter of the valve, DN, mm (″)

15...150 / 50...150 (1/2...6 / 2...6)

Lapping-plate diameter, mm (″)

620 (24)

Number of cartridges


Internal diameter of the cartridges, mm (″)

266 (10)

Machined-surface roughness, μm


Machined-surface nonflatness (accuracy), mm (″)

0,0006 (0,00024)

Lapping-plate speed, rpm


Installed power, kW


Electric power supply, V/Hz

400/50 (480/60*)

Working pressure of network air, bar (psi)


Overall dimensions (LхWхH), mm (″)

1160х916х990 (46x38x41)

Weight, kg



  • Each point of the lapped surface of the parts makes complex plane-parallel motion on the lapping-plate surface. 
  • The machine is equipped with the polishing-compound supply device. 
  • The spent compound is collected in a special tank. 
  • The lapping time is automatically controlled by the timer.
  • The machine is equipped with the smooth start device with the lapping-plate speed adjustment. 
  • The machine is designed so that the lapping disc can be adjusted during its operation. 
  • The "loading" mode ensures the cartridge supply to the part-installation area on the lapping plate (as required by operator).