Text version of the page

M PA S eries

Piston-Cylinder Unit

The MPA piston-cylinder series has been designed in tungsten carbidematerial; the other parts of the unit are made of austenitic stainless steel.Four piston cylinder units are available. MPA P/C models: ✓ from 1,2 to 120 MPa (MPA120) ✓ from 0,6 to 60 MPa (MPA60) ✓ from 0,36 to 36 MPa (MPA36) ✓ from 0,12 to 12 MPa (MPA12) All the piston-cylinders are free deformation units. The top part of the piston has been integrated into another stainlesssteel component that supports the masses carrier. The maximum pressure value for the MPA chassis is equal to 125 MPa(1250 bar).

Piston Fall Rate

The behavior of piston fall rate as a function of pressure is herewith shown for a 60 MPa full scale unit. For all the assemblies, the behavior of the piston's fall rate is linear as a function of the pressure.

Effective Area

The behavior of Ae = f(p), herewith shown for a 120 MPa full scale unit, points out a good linearity of the effective area as a function of pressure, as expected for a free deformation unit. The mean value of effective area of the piston-cylinder unit at atmospheric pres- sure and at reference temperature of 20°C, as well as the pressure distortion coefficient are carried out by Cross-floating with a Reference Pressure Balance. FEM studies by Cassino University have been made to validate the design of the unit.