DPS TB (DOUBLE ACTION PISTONSEAL HD)

product

DPS TB 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 installed in the one-piece piston on the one hand, and special mixture PTFE be mounted with a special installation tool. Then the doorgesnede guide rings should be assembled. It is required that the applied chamfers on the piston and the cylinder bore must be deburred and rounded. It is important that the assembly tool has to be soft material, and no sharp edges. For the installation of the seal element needs to be lubricated with oil system.

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

PERMISSABLE SEALING GAP Smax (mm)
Pressure (Bar) 600 Bar
≤350 mm 0.45
>350 mm 0.25

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/BRONZE / NBR 80 SH / POM

 

OPERATING CONDITIONS 
MEDIA Mineral oils(DIN 51524)  HFA and HFB HFC
TEMPERATURE -30°C +105°C +5°C +60°C -30°C +60°C
PRESSURE ≤600 Bar ≤600 Bar ≤600 Bar
SPEED ≤1.5 m/sn ≤1.5 m/sn ≤1.5 m/sn

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

SURFACE ROUGHNESS Ra Rmax
Sliding Surface ØD ≤0.2 μm ≤2.0 μm
Groove Base Ød ≤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)
zuiger-afdichting/dps-tb DPS TB DPS TB (DOUBLE ACTION PISTONSEAL HD) PISTON PTFE/BRONZE - NBR - POM 600 -30°C +105°C 1.5
PTFE/BRONZE - FPM - POM 600 -20°C +200°C 1.5
TPE-NBR-POM 700 -30°C +105°C 0.3
PTFE/POM/NBR 600 -30°C +105°C 1.5
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