PKTBA-SP

Lapping (polishing) machines

Machines for lapping (polishing)

LAPPING (POLISHING) MACHINES

PURPOSE:

• the machines are designed for lapping (polishing) of the flat sealing surfaces of the gate valve wedges, valve spools, and Christmas-tree wedges.
• the special-configuration PKTBA-SP-5 and PKTBA-SP-5-1 machines are 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:

• PKTBA-SP-4-2: Ø 1000 mm (40'') (1200 mm (48'') - by order). Approximately: for wedges of gate valve DN 50…500 mm (2...20''), for valve spools DN 40…200 mm (2...8'').
• PKTBA-SP-5: Ø 510 mm
(20''). Approximately: for wedges of gate valves DN 15…150 mm ( 1/2...6'').
• PKTBA-SP-5-1: Ø 620 mm
(25''). Approximately: for end seal rings.

EQUIPMENT ADVANTAGES:

• Thanks to the special design, 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 envisaged in the machine structure.
• A timer automatically controls lapping time.
• 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).

TECHNICAL CHARACTERISTICS:

Parameter

PKTBA-SP-4-2

PKTBA-SP-5

PKTBA-SP-5-1

Nominal diameter of valve, DN, mm ('')

50…500 (600*)(2...20 (24*))

15…200 (1/2...8)**

-

Lapping plate diameter, mm ('')

1000(1200*) (40 (48*))

510 (20 3/8)

620 (25)

Number of cartridges

3/1

3

3

Internal diameter of the cartridges, mm ('')

478/672 (19/27)

216(9)

266 (11)

Machined-surface roughness, micron ('')

0,2…0,4 (7,9x10-6...15,7x10-6)

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

0,01 (3,9x10-4)

Capacity, pcs/hour

3…40

3...9

3...9

Lapping plate speed, rpm

13…45

16

13...29

Motor power, kW

3

0,75

0,75

Electric power supply, V/Hz

380/50 (480/60*)

Working pressure of network air, bar (psi)

6,3 (91)

-

-

Overall dimensions, mm ('')

1400 х 1400 х 890 (56 x 56 x 36)

840 х 750 х 780 (34 x 30 x 31)

750 х 860 х 960 (30 x 34 x 38)

Weight, kg (lbs)

1470 (3241)

400 (882)

480 (1058)

* By customer's order and completed questionnaire.
** Valve spools.