K 19 is a four piece double acting heavy duty compact seal which consists of one PTFE bronze profile ring, one elastomeric nitrile rubber pre-load sealing element and two thermoplastic back-up rings.

PRODUCT ADVANTAGES

  •  High sliding speed

  • Low friction , free of stick-slip

  • Simple groove design

  • Long service life

  • Very good sealing performance even with pressure peaks

  • High resistance to abrasion

  • Increased clearance possible

APPLICATION

Mining equipment, construction machinery and earth moving equipment.

INSTALLATION

The elastomeric ring should be assembled into the one-piece piston firstly, and then special mixture PTFE should be assembled with a special assembly tool, lastly the split guide rings should be installed. The required insertion chamfers on the piston and cylinder bore should be de-burred and rounded. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the sealing element must be oiled with system oil.

NOTES

For special applications that require high temperatures, piston seal is being manufactured with FKM pre-load component , pure PTFE back-up rings and special mixture PTFE profile ring. Due to the design, K19 can be used up to shock pressures of 600 bar safely. The permissible sealing gap values of K19 heavy duty piston seal is given in the below table.

MaterialCode
NBR 80 SHORE ANBR8001
PTFEPT6003
POMPM9901
Surface roughnessRaRmax
Sliding Surface Ød≤0.2 μm≤2.0 μm
Groove Base ØD≤1.6 μm≤6.3 μm
Groove Flanks≤3.2 μm≤16 μm

PERMISSIBLE SEALING GAP

Pressure(Bar)Smax (mm)
P≤3500.45
350<P≤6000.25

OPERATING CONTITIONS

MediaMineral oils (DIN 51524)HFA HFBHFC
Temperature-30 °C
+105 °C		+5 °C
+60 °C		-30 °C
+60 °C
Pressure≤400 bar≤400 bar≤400 bar
Speed≤1.5 m/sec≤1.5 m/sec≤1.5 m/sec

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