What ensures a proper seal in threaded hydraulic connections?

The use of thread tape or sealant is essential for ensuring a proper seal in threaded hydraulic connections. This is because hydraulic systems rely on pressure to function correctly, and any leaks due to improper sealing can lead to a loss of efficiency, fluid leakage, or even system failure. Thread tape, also known as Teflon tape, or other types of sealants fill the gaps between the threads of the connection, preventing fluid from escaping. They create a barrier that effectively seals the joint, making it particularly important in high-pressure and high-temperature applications where standard mechanical tightening alone may not suffice.

On the other hand, while locking washers can help maintain the integrity of a mechanical connection, they do not specifically address the sealing function required in hydraulic applications. Wrench tightening is an important step to ensure that connections are securely fastened, but it does not inherently create a seal without the additional use of tape or sealant. Nuts and bolts are also part of mechanical fastening but similarly do not contribute to sealing hydraulic fluids unless combined with proper sealing compounds. Thus, the combination of threaded connections with appropriate sealants is the best practice to prevent leaks in hydraulic systems.