NOK Type Hydraulic Piston Seal SPG

NOK Type Hydraulic Piston Seal SPG

SPG is a compact double acting piston seal for medium to heavy duty applications. The reinforced, heat stabilized, thermoplastic sealing face with step-cut joint allows the seal to pass over ports, making it an ideal choice for double acting telescopic cylinders.

It comprises a bronze filled PTFE face ring, which is pre-loaded by a square section NBR ring. The cap ring is precision machined from a compression moulded billet. Compression moulding of the material offers consistently superior physical properties as compared to automatic moulded products. The machined face ring has chamfered corners for easy installation and a surface finish free from the “orange peel” effect associated with automatic moulded products. As only the PTFE face ring is in contact with the sliding surface, friction is very low and stick slip movement is eliminated. The housing width allows the designer to use a narrow width piston, but it is recommended that an adequate bearing be mounted on either side of the seal as shown.

Materials
Standard materials are bronze / PTFE with a NBR square section energizer.

SPG piston seal
MaterialPoer-transmission fluidTemperatureSpeedPressureMax. Gap F
PTFE+bronzeMineral Oil (NBR)-30 – +110≦ 15m/s160 barF ≦ 0.6mm
Mineral Oil (FKM)-30 – +200250 barF ≦ 0.4mm
400 barF ≦ 0.2mm
Chamfers & Rad(mm)ToleranceSurface Finishing
μm Raμm Rt
S ≦3.755.57.510.512.515ØD1H90.1-0.4≦ 4
C ≧2357.588.5Ød1h9≦ 1.6≦ 10
r1 ≧0.40.81.21.61.62.0L+0.2 – 0≦ 3.2≦ 16

SPG PISTON SEAL LIST

ITEM NO.SIZE
SPGdDhHC
3020.5304.34.52
31.52231.54.34.53.5
3222.5324.34.53.5
3525.5354.34.53.5
35.52635.54.34.53.5
4030404.34.53.5
4535454.34.53.5
5040504.34.54
5545554.34.54
5646564.34.54
6050604.34.54
6348637.37.54
6550657.37.54
6954697.37.54
7055707.37.55
7156717.37.55
7560757.37.55
8065807.37.55
8570857.37.55
9075907.37.55
9580957.37.55
100851007.37.55
105901057.37.55
108921087.37.55
110941107.37.55
112961127.37.56.5
1201041207.37.56.5
1251091257.37.56.5
1301141307.37.56.5
1351191357.37.56.5
1401241407.37.56.5
1451291457.37.56.5
1501341507.37.56.5
1551391557.37.56.5
1601441607.37.56.5
17014817010.8116.5
18015818010.8116.5
19016819010.8116.5
20017820010.8116.5
20418220410.8116.5
21018821010.8116.5
21519321510.8116.5
22019822010.8116.5
22420222410.8116.5
22520322510.8116.5
ITEM NO.SIZE
SPGdDhHC
23020823010.8116.5
24021824010.8116.5
25022825010.8116.5
26023626011.7127.5
27024627011.7127.5
28025628011.7127.5
29026629011.7127.5
30027630011.7127.5
31028631011.7127.5
32029632011.7127.5
3303083309.751010
36033636011.71210
40037640011.71210
48545548514.81510
50047050014.81510
55051555017.217.510
60057060014.81510
65062065014.81515
72069072014.81515
80078580012.71315
90087090024.52515
930890930192015
93592093512.71315
95092595017.71815
1000960100019.72020
10601020106019.72020
11201080112019.72020
11501110115019.72020
11801130118019.72020
121011701210192020
12501210125019.72020
12601220126019.72020
14001350140019.72020
15001460150019.72020
165016001650242520