tunable fluid ends reduce valve - generated vibration to increase fluid - end reliability . tunable fluid end embodiments comprise a family , each family member comprising a fluid end housing with at least one installed tunable component chosen from : tunable check valve assemblies , tunable valve seats , tunable radial arrays and / or tunable plunger seals . each tunable component , in turn , contributes to blocking excitation of fluid end resonances , thus reducing the likelihood of fluid end failures associated with fatigue cracking and / or corrosion fatigue . by down - shifting the frequency domain of each valve - closing impulse shock , initial excitation of fluid end resonances is minimized . subsequent damping and / or selective attenuation of vibration likely to excite one or more predetermined fluid end resonances represents further optimal use of fluid end vibration - control resources .