A precision stack of thin shims used to control fluid flow and pressure in hydraulic and pneumatic valving systems.
A shim stack is an assembly of multiple thin, precisely manufactured shims (typically metallic discs or washers) stacked together within a valve body. It functions as a critical flow-control element in hydraulic and pneumatic systems, where the collective thickness, number, arrangement, and orifice patterns of the shims determine the valve's pressure-flow characteristics, response time, and damping behavior. The stack is often compressed between valve plates or seats and can be customized by adding or removing shims to tune system performance.
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A shim stack precisely controls fluid flow and pressure by flexing under pressure to open orifices, enabling adjustable damping, pressure relief, and flow modulation in hydraulic/pneumatic systems.
Performance is tuned by changing the number, thickness, arrangement, or orifice patterns of shims in the stack. Adding shims increases stiffness and pressure threshold; removing shims reduces it.
Shim stacks are generally replaced as an assembly if worn or damaged, as reuse can compromise sealing and performance. Individual shims may be replaced during maintenance if specifications allow.
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