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Automatic Pressure Unit for Lateral Pressure in Hoek Triaxial Cell


The TR-0450.PVPR Automatic Pressure Unit is used to apply lateral pressure in the Hoek Cell during the triaxial testing of rock specimens. The power pack is equipped with a proportional valve to provide a sensitive control of the loading rate and to maintain a constant confining pressure to within 0.1 bar. Pressure is controlled using the PID closed loop controlled electronics. The user can define the set lateral pressure and display the lateral pressure through the U-Touch PRO Control Unit.

Any capacity which depends on the rigidity and sizes of rock specimens to be tested, EN or ASTM automatic compression testing machines can be used for applying the vertical loads required for the triaxial and uniaxial tests. Options for weaker rock specimens, the compression machines can be upgraded with option ‘TC-0210 special calibration procedure’ to have Class 1 starting from 1% of the full capacity range.

To see the details of Hoek Triaxial Cells required for triaxial testing of rock specimens, please look at the ‘Rock Triaxial Test Accessories’ page.


  • EN 1926
  • EN 14580
  • ASTM D2664
  • ASTM D2938
  • ASTM D3148
  • ASTM D5407

Safety Features of TR-0450.PVPR

  • Maximum pressure valves to avoid machine overloading
  • Emergency stop button
  • Software controlled maximum load valve


Accessories are not included in the price of main device (unless stated otherwise) and may be purchased separately if required.

TR-0455 Hoek Triaxial Cell BX Ø42.04mm Dia.
TR-0457 Hoek Triaxial Cell NX Ø54.74mm Dia.
TR-0460 Hoek Triaxial Cell HQ Ø63.5mm Dia.
TR-0400 Compression Jig Assembly
TC-0210 High Precision Pressure Transducer and Electronics


Technical specifications are subject to change without notice.

Max. Working Pressure 420 bar
Min. Controllable Pressure 3 bar
Pressure Accuracy 0.1 bar
Dimensions mm (W x D x H) 400 x 450 x 1000
Weight (approx.) Kg 80
Power W 750