Expansion caps are a practical and reliable solution in hydraulics. In particular, in the construction of hydraulic cylinders, expansion caps (or end caps) close the openings in the bottoms of the most complex cylinders, where the cartridge valves are housed. In this article we will explain what expansion plugs are, what the advantages of using them, and what the most common applications are.
 

What are expansion caps?
Expansion caps, also known as expansion plugs or end caps, are mechanical components designed to seal or close openings in cylinders and other tubular components. Depending on the specific application requirements, these caps can be made of various materials, including steel, stainless steel, brass and plastics.

 
How do expansion caps work?
The operating principle of expansion caps is relatively simple but extremely effective. When inserted into a hole, the ball is punched through a special tool, causing the cap to expand against the inner walls of the opening. This expands the cap and creates an airtight seal that prevents leakage of fluids or gases and protects the inside of the cylinder from external contamination.


Advantages of expansion caps
  • Reduced costs
  • Efficient sealing. Compared to other sealing methods, the sealing provided by expansion caps is significantly more efficient and ensures the reliability and efficiency of hydraulic cylinders.
  • Easy and fast installation. Expansion caps are relatively easy to install. They do not require complex tools (a hand punch or machine insertion punch  is sufficient) and can be installed quickly, reducing assembly time. 
 
Applications of Expansion caps
Expansion caps find application in various industries, including:
  • Hydraulic cylinders. They are essential for ensuring fluid tightness and internal pressure in cylinders.
  • Hydraulic valves
  • Manifold
  • Hydraulic distributors


Expansion caps - Conclusions
Expansion plugs are a reliable and efficient solution for cylinder manufacturers. Their ability to create hermetic seals, ease of installation, versatility and durability make them a preferred choice in many industrial applications. Understanding the importance and benefits of these components can help cylinder manufacturers improve the performance and durability of their products, while ensuring the reliability and safety of the systems in which they are used.



Need more information on expansion plugs and how they can improve construction processes? Contact our technicians or visit the expansion caps page.