Slipper ptfe Composite seals | Piston Slipper POK

 
Piston Slipper POK

Slipper composite seals for the most demanding working conditions and the most extensive clearence. Resizing is needed if installed in closed groove.

Housing
class
A
cylinder bore range
F
groove diameter
L
groove width
R S
min
G*
max. radial gap
  suggested available         pressione di esercizio bar
  H8 h9 H12     50 100 200 400 800
P1 50-70,9 50-100 A- 15 10 0,4 7,5 0,65 0,6 0,5 0,4 0,1
P2 80-149,9 80-250 A- 20 10 0,4 7,5 0,7 0,6 0,5 0,4 0,2
P3 150-244,9 150-450 A- 25 12,5 0,4 10 0,8 0,75 0,65 0,5 0,2
P4 245-454,9 200-650 A- 30 15 0,8 12 0,8 0,75 0,65 0,5 0,2
P5 455-759,9 400-1200 A- 35 17,5 1,2 12 0,8 0,75 0,65 0,5 0,2
P6 760-1200 500-1200 A- 40 20 1,2 15 0,9 0,8 0,7 0,55 0,25
G*=G1+G2+G3 G1 = Max. initial clearence
G2 = Clearence by elastic deformation of the components under pressure.
G3 = Clearence due to the forseen wear of the guiding elements.
SLIPPER COMPOSITE SEALS ASSEMBLING INSTRUCTIONS

 

ASSEMBLY ON PISTON IN CLOSED GROOVE AND IN OPEN GROOVE

 

slipper composite seals assembling Assembly in closed groove can be carried out manually, however the use of the appropriate equipment guarantees the integrity of the slipper and time-saving insertion.

Assembly in open groove is suggested for slippers exceeding the dimensions shown in dimensional table.

Correctly carried out introduction blunting and the lubrication of the surfaces make assembly easier.

For an easier assembling in closed groove the preheating of the Slipper in oil or water bath at 90-100°C is suggested.
slipper composite seals assembling

 

INSERTION AND RECALIBRATION EQUIPMENT FOR INSTALLATION IN CLOSED GROOVES ON THE PISTON

 

slipper composite seals assembling The expander cone brings the Slipper to the diameter of the piston, or to the edge of the groove when other existing grooves must be passed over.

The thruster expands sector by sector, or more simply, in single logitudinal cutting.

Both the cone and thruster can be made in acetal resin (POM), polyester (PBTF) or polyamide (PA6)

The prolonged extended permanence of the Slipper during installation could determine a permanent increase in diameter; therefore fast installation is advised.
Recalibration of the slipper may be opportune using a sleeve before insertion of the piston in the cylinder.

The sleeve also allows the passing over of grooves and threads.
slipper composite seals assembling

 

INSTALLATION ON THE CYLYNDER IN CLOSED GROOVE

 

slipper composite seals assembling

The Slipper seal can be introduced in the closed groove imposing a reniform deformation.


The radius R should never be little then 3 times S

Open groove installation is advised for rods exceeding  the diameter shown in dimensional table.

slipper composite seals assembling

The mono-directional R type Slipper is
installed using this method of positioning
the seal-front towards the pressure.

SURFACE FINISH ACCORDING WITH FLUID
application max Ra µm
dynamic surface
max Ra µm
static surface
CRYOGENICS 0,1 0,2
FREON
HELIUM
HYDROGEN
0,2 0,3
AIR
NITROGEN
ARGON
METHANE
FUELS
0.2 0.4
WATER
OIL
0.3 - 04 0.6
ROTOLIP ROTARY SEALS
 Shaft surface

Ra 0.2 - 0.3 micron max.
Rz 1.0 - 2.5 micron max.
R max. < 4 micron
Shaft hardness

55 HRC min. for pressure up to 5 bar
60 HRC min. for pressure > di 5 bar
60 HRC for speed > 4m/sec
Surface treating deep

0.3 mm min.

Click compound's code to download the .PDF data sheet. Registration required.

HD Slippers
code
Composition Approvals ΔT °C Description
N-020 Virgin PTFE FDA
NORSOK
-268 +260 All pourpose, low friction coefficient, extrusion withstanding.
N-009 Ptfe-oxides FDA -268 +260 All pourpose on soft surfaces
N-031 Ptfe-bronze   -268 +260 High wear resistance, hidraulic seals
N-032 Ptfe-carbon   -268 +260 High wear resistance, pneumatic and hydraulic seals
N-059 Ptfe-carbographite   -268 +260 High wear resistance, hydraulic and pneumatic seals, hard surfaces
N-197 Ptfe-carbographite NORSOK -268 +260 High wear resistance, hydraulic and pneumatic seals
N-043 Ptfe-graphite FDA -268 +260 High wear resistance, low friction coefficient.
N-103 Ptfe-carbon fibre FDA -268 +260 High wear resistance, low friction coefficient, hard surfaces.
N-077 Ptfe-glass fibre-MoS2   -268 +260 Of general use, in lubricated applications, rotary seals
N-060 Ptfe-glass fibre FDA -268 +260 All pourpose on hard surfaces
N-067 Ptfe-glass fibre FDA
NORSOK
-268 +260 High wear and creep resistance
N-102 Ptfe-Liquid crystal polymer FDA - EU
-268 +260 Food & Pharma, soft surfaces
N-088 Ptfe-poliimmide   -268 +260 High wear resistance. Soft surfaces
N-074 PEHMW FDA -140 +80 High wear and extrusion resistance
P95-A112 Polyurethane     -30 +105 Extrusion withstanding, low friction coefficient

P95-G114

Polyurethane FDA -30 +105 Extrusion withstanding, lower friction coefficient

 


 

 

CHOOSING Neuflon-ptfe compound ACCORDING WITH FLUID AND SURFACE
  SURFACES
  Steel HEC>=30-45
Temp. Mart. Inox Steel
Cast Iron HRB<=200
Steel HRC>=45
Cast Iron HRB>200
Galvanic or chemical surfacing HV>=700
Chromium Bronze
Bronze
Brass
Treated Aluminium Aust. Inox Steel
Glass
FLUIDS NEUFLON-ptfe compounds (standard in bold)
Hydraulic oil
Transmission oil
Fire resistant syntetic hydraulic oil
N-031
N-032 N-060 N-077 P95-A112
N-031
N-032 N-060 N-077 P95-A112
N-009
N-043 N-032 P95-A112
N-032
N-074 P95-A112
N-009
N-032 N-074 P95-A112
Water and oil/water emulsions N-032
N-060 N-077 N-074
N-032
N-060 N-077 N-074
N-009
N-043 N-074
N-032
N-074
N-009
N-032 N-074
Drugs and food N-009
N-102 N-020 N-043 N-060 N-074 N-088 P95-B113
N-009
N-074 P95-B113
N-102
N-009 P95-B113
N-009
N-074 P95-B113
N-009
N-074 P95-B113
Air N-032
N-031 N-043 N-074 P95-A112
N-032
N-043 P95-A112
N-032
N-009 N-043 N-074 P95-A112
N-032
N-074 P95-A112
N-032
N-009 N-043 N-074 P95-A112
Steam N-032
N-043
N-032 N-009
N-032 N-043
  N-032
N-009 N-043
Acids and Bases N-032
N-059 N-074
N-032
N-043 N-074
    N-009
N-032 N-043 N-074

 


 

 

ELASTOMER ACCORDING WITH FLUID

FLUID ELASTOMER
HYDRAULIC OIL - TRANSMISSION OIL NBR
FIRE RESISTANT SYNTETIC HYDRAULIC OIL EPDM
WATER AND WATER/OIL EMULSIONS NBR
FOOD AND DRUG MVQ
AIR NBR
STEAM EPDM - FFKM
ACIDS AND BASES FKM - FFKM