The poppet mass in  4.12 is given by 0.01 kg, the spring is compressed 10 mm in the nominal operating mode

Posted: January 9th, 2022


The poppet mass in  4.12 is given by 0.01 kg, the spring is compressed 10 mm in the nominal operating mode, the damping length is 25 mm, the fluid bulk modulus is 1 GPa, and the compressible fluid volume is 5 × 10–4 m3. Is the poppet valve stable? Why or why not?

A gear pump has been designed to displace 19 cm3/rev. When the pump is operating at 14 MPa the torque efficiency is measured to be 92%. What is the input torque to the pump?

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