TESCO STEP is a two piece single acting rod seal which consists of one special mixture PTFE profile ring (stepseal) and an nbr ring as energizing element.
Injection moulding machines , fork-lift trucks , loading platforms , cranes , agricultural machinery , hydraulic breakers and servo cylinders.
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.
TESCO STEP 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 TESCO STEP rod seal is given in the below table.
|PERMISSIBLE SEALING GAP Smax(mm)|
|t=(D-d)/2||150 Bar||250 Bar||400 Bar|
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 80 SH
|MEDIA||Mineral oils(DIN 51524)||HFA and HFB||HFC|
|TEMPERATURE||-30°C +105°C||+5°C +60°C||-30°C +60°C|
|PRESSURE||≤400 Bar||≤400 Bar||≤400 Bar|
|SPEED||≤5.0 m/sn||≤5.0 m/sn||≤5.0 m/sn|
Note: The above data are maximum values and cannot be used at the same time.
|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||≤16 μm|
Note: It is recommended to have 50% to 90% of the working surface material contact area value.
CB = Custom build (price on request)
* = Stock item
Stock = 0 (and not a Stock* or CB product) -> minimum item value € 10.00