Takes into account along with the compressibility of the pressure fluid also the elasticity of the surrounding components as well as the connection line between the valve and .
The equivalent bulk modulus is not a constant magnitude, but instead a function of the pressure. This situation applies above all for the low pressure range. The reason for this relationship is the mostly unavoidable undissolved air content of the oil as well as the non-linear expansion of hoses (Figure E 35).
![2db076ecb8b9b889eeb86ca229d06f4644fde4ef ersatzkompressionsmodul_e___oe_l_01.gif](/fileadmin/smc/files/2db076ecb8b9b889eeb86ca229d06f4644fde4ef.gif)
![8e4411bebf043f3a745a33d797432e573445533c 0001_ersatzkompressionsmodul_e___oe_l.gif](/fileadmin/smc/files/8e4411bebf043f3a745a33d797432e573445533c.gif)
Figure E 35: Equivalent bulk modulus for a pipe and hose