Flat lapping (polishing) machine

Purpose

  • machine is designed for lapping (polishing) of the flat sealing surfaces of the gate valve wedges, valve spools, and сhristmas-tree wedges; 
  • special-configuration SP-600 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

  • SP-1200: Ø 1250 mm (40″). Approximately, DN 50…600 mm (2...24″) for the wedges of the gate valves, and DN 40…200 mm (2...8″) for the spools of the valves.
  • SP-600: Ø 620 mm (24″). For the wedges of the gate valves DN 50…150 mm (2...6″).

Parameter

SP-1200

SP-600

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

50…600 (2...24)

15...150**/50...150** (½...6**/2...6)

Lapping-plate diameter, mm (″)

1250 (49)

620 (24)

Number of cartridges

3/1

3

Internal diameter of the cartridges, mm (″)

550/830 (22/33)

266 (10)

Machined-surface roughness, μm

0,08...0,1

0,08...0,1

Machined-surface nonflatness (accuracy), mkm

0,6

0,6

Lapping-plate speed, rpm

5…40

10...50

Installed power, kW

8

4

Electric power supply, V/Hz

400/50 (480/60)

Working pressure of network air, bar (psi)

6,3 (91)

-

Overall dimensions (LхWхH), mm (″)

1976х1645х1325 (78x65x52)

1160х916х990 (46x38x41)

Weight, kg

1410

625

     
 * Upon customer request.
** Valve spools.
   

Advantages

  • Each point of the lapped surface of the parts makes complex plane-parallel motion on the lapping-plate surface.
  • The machines are 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 machines are equipped with the smooth start device with the lapping-plate speed adjustment.
  • The machines are designed so that the lapping disc can be adjusted during its operation.

Video