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Relief Valve Dynamics

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Simulation of a direct operated hydraulic relief valve

RV_PUMP_Dynamics_data.m
%Damping spool diameter (m)
Dd=0.006
% Damping spool area (sq m)
Ad=3.14156*Dd*Dd/4
% Spring stiffness (N/m)
krv=210000
% Damping spool length (m)
L=0.005
% radial clearance of damping spool (m)
c=20e-6
cc=55e-6
ccc=80e-6
% Equivalent seat material stiffness (N/m)
ks=1e6
%Equivalent seat material damping
Rs=10000
% Piston friction coefficient
f=50
%Bulk Modulus of oil
B=1.5E9
% Initial volume of the damping spool chamber (Cub. m)
Vo=2e-6
% Reduced mass of moving parts (kg)
m=0.3
% Return pressure
Pr=0
% Discharge coefficient
Cd=0.6
% oil density (kg/cub.m)
Ro=867
% Dynamic viscosity (Pa s)
Mu=0.02
% Pump exit line volume
Vp=200e-6
%Pump resistance to leakage
RL=1e12
% Pump theoretical flow rate
Qth=0.0002

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