a pneuma c pressure regulator knob, which is part of a compressed air pressure regulator assembly. This knob allows manual adjustment of air pressure within a pneuma c system.
 Regulates air pressure by adjustingthe spring tension inside the
pressure regulator.
 Usually mounted on a modular pneumatic control system.

A pressure relief valve or regulator is a safety and control device designed to maintain or relieve excess pressure in fluid systems.
Maintaining constant back pressure in fluid dispensing
systems
Protecting components (like pumps or hoses) from overpressure
Controlling flow rates by keeping a system under a controlled pressure range

It’s a repair kit containing the core measuring element of a helical gear flow meter along with replacement parts like seals and possibly a specialized nozzle or component. This kit contains critical internal components, suggesting that the main body shown is likely the measuring chamber of the flow meter, and the smaller parts are replacements for wear-prone elements.

It’s a collection on of various seals, O-rings, and packing elements, likely intended as a maintenance
or replacement kit for a specific piece of machinery or component. These parts are crucial for preventing fluid (liquid or gas) leakage, maintaining pressure, and protecting internal components from contamination.

Stacked Rings (Left Side)
Smaller Stacked Rings (Middle-Left )
Individual White O-rings (Top Right)
Individual White Formed Seals/Bushings (Middle Right)
Large White O-ring (Bottom Right)
Single Black O-ring (Bottom om Middle)