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2. Hydraulic clearance - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_clearance

   A tight clearance minimizes fluid loss, while a clearance that is too small can lead to increased friction and wear. The piston's design and the material used influence the optimal clearance. [2] Hydraulic spool valves: These valves rely on precise clearances to control the flow of hydraulic fluid. The clearance between the spool and valve body ...

3. Tappet - Wikipedia

   en.wikipedia.org/wiki/Tappet

   A hydraulic tappet, also known as a "hydraulic valve lifter" and "hydraulic lash adjuster", contains a small hydraulic piston that becomes filled with pressurised engine oil. [4] [11] The piston acts as a hydraulic spring that automatically adjusts the tappet clearance according to the oil pressure. Although the movements of the piston are ...

4. Hydraulic tappet - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_tappet

   A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower. This clearance prevents the parts ...

5. Piston ring - Wikipedia

   en.wikipedia.org/wiki/Piston_ring

   Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image. A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are:

6. Hydraulic seal - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_seal

   A hydraulic seal is a relatively soft, non-metallic ring, captured in a groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in machinery. Their use is critical in providing a way for fluid power to be converted to linear motion.

7. Cylinder (engine) - Wikipedia

   en.wikipedia.org/wiki/Cylinder_(engine)

   In an engine, the cylinder is the space in which a piston travels. [1]The inner surface of the cylinder is formed from either a thin metallic liner (also called "sleeve") or a surface coating applied to the engine block.