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GIR (SINGLE ACTION PTFE BRONZE OR PU STEPSEAL)

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GIR is a two piece single acting rod seal which consists of one special mixture PTFE profile ring (stepseal) and an o-ring as energizing element.

 PRODUCT ADVANTAGES

  • ​Low friction , free of stick-slip
  • Due to the special profile it can be used in pair or in front of the u-ring.
  • Long service life
  • High sliding speed
  • Wide range of temperature and chemicals depending on the o-ring material
  •  Minimum static and dynamic friction coefficient for a minimum energy loss and operating temperature
  • Simple groove design and low axial housing heights

APPLICATION
Injection moulding machines , fork-lift trucks , loading platforms , cranes , agricultural machinery , hydraulic breakers and servo cylinders.

INSTALLATION
We recommend using special assembly tool (See section; Hydraulic Sealing Elements General Installation Information). 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: GIR type of rod seal can be also used with double lip wipers (VNISO). For special applications that require high temperatures or resistance to chemicals , piston seal is being manufactured with special mixture PTFE and FPM material. For heavy duty applications and high pressures the tolerances should change to H8/f8 and please contact the customer service to choose the suitable sealing element. The permissible sealing gap values of GIR rod seal is given in the below table.

PERMISSIBLE SEALING GAP   Smax(mm)
t=(D-d)/2 150 Bar 250 Bar 600 Bar
2.2 0.25 0.15 0.10
3.2 0.35 0.20 0.10
4.2 0.35 0.20 0.15
6.3 0.45 0.30 0.20
8.1 0.50 0.35 0.25
9.5 0.60 0.50 0.40

Note: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers. 

MATERIAL: PTFE / NBR 70 SH

 

OPERATING CONDITIONS
MEDIA Mineral oils(DIN 51524)  HFA and HFB HFC
TEMPERATURE -30°C +100°C +5°C +60°C -30°C +60°C
PRESSURE ≤600 Bar ≤600 Bar ≤600 Bar
SPEED ≤15.0 m/sn ≤15.0 m/sn ≤15.0 m/sn

 Note: The above data are maximum values and cannot be used at the same time.

SURFACE ROUGHNESS Ra Rmax
Sliding Surface ØD-Ød ≤0.2 μm ≤2.0 μm
Groove Base ØDb-Ødp ≤1.6 μm ≤6.3 μm
Groove Flanks B ≤3.2 μm ≤15 μm

 Note: It is recommended to have 50% to 90% of the working surface material contact area value.

 

 

 

 

 

 

 

 

 

 

 

 

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# Vota code Name Application Material Pressure
(bar)		 Temperature °C Sliding Speed (m/s)
hydraulic-seals-rod-seal/gir GIR GIR (SINGLE ACTION PTFE BRONZE OR PU STEPSEAL) ROD/AXLE PTFE/BRONZE NBR 600 -35°C +100°C 15
PTFE/BRONZE FPM 600 -20°C +200°C 15
PU-NBR 600 -35°C +100°C 5.0
UHMWPE+OR 250 -35°C +100°C 1.0
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