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Soil mechanics

Air/Water pressure system and controls panels

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General description
General description
Bladder air/water pressure cylinders
The Bladder air/water cylinders are used to deliver pressurized water up to 1000 kPa to triaxial cells by the pressure distribution panels. The main advantages from using this apparatus are:
  • High degree of accuracy
  • Extremely simple to operate
  • Future expansion of system very easy and relatively low cost
  • Bladder enables the use of de-aired water
  • Large reservoir to cope with long term tests and large samples
The cell, made from transparent acrylic tube, flanged between two light alloy discs, incorporate a rubber membrane and can operate continuously at a pressures up to 1000 kPa. The unit acts as a reservoir/interface between compressed air, used as a pressure source and water used as the pressurizing medium in the triaxial cell. The Bladder air/water cylinders have to be completed with the 28-WF4330 or 28-WF4331 two or three lines distribution panel depending on the application.
  • Dimensions: 178 mm dia. x 410 mm high
  • Weight approx.: 5.8 kg

Pressure distribution panels
Two models available: 28-WF4330 for two pressure lines and 28-WF4331 for three pressure lines. They include precision air regulators, pressure outlets and quick release fittings.
They have to be completed with a digital gauge (see accessories, model 28-WF4330/2).
  • Dimensions/weight approx.:
    510x454x184 mm (28-WF4330)/10 kg
    690x454x184 mm (28-WF4331)/15 kg
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Ordering info

28-WF4320 
Bladder air/water pressure cylinder

28-WF4330 
Two lines pressure distribution panel, complete with air regulators and pressure outlets.

28-WF4331 
Three lines pressure distribution panel, complete with air regulators and pressure outlets.

Accessories

Bladder air/water pressure cylinders

28-WF4191 
Nylon tubing 8x6 mm dia. 10 m coil

28-WF0490 
Nylon tubing 6x4 mm dia. 20 m coil

86-D2015 
Laboratory air compressor, 10 bar max. pressure, 50 l cap. 230 V, 50 Hz, 1 ph

28-WF2016/2
Air filter/water trap for air compressors

28-WF4320/1 
Spare rubber membrane for 28-WF4320 Bladder

Pressure distribution panels

28-WF4330/2
Digital pressure gauge, 1 kPa resolution

28-WF4330/3
Spare air pressure regulator, 150 p.s.i., 1000 kPa, with fittings for 8 mm dia. OD tube.

Note:  Digital gauge can be supplied, on request, with traceable calibration certificate. The models are identified adding the suffix Cat the end of the code number. Ex. 28-WF4330/2C

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