A hollow hydraulic ram, also known as a hollow hydraulic cylinder or hollow plunger cylinder, is a type of hydraulic cylinder with a hollow center. Unlike traditional hydraulic cylinders where the piston rod extends from one end, in a hollow hydraulic ram, the piston rod extends through the center of the cylinder, creating a hollow space.

Here are some key features and characteristics of hollow hydraulic rams:

Hollow Center: The primary feature of a hollow hydraulic ram is the presence of a hollow center or cavity. This hollow space allows for the passage of fluids, gases, or other materials through the center of the cylinder. The hollow design provides flexibility for various applications where a through-hole or passage is required.

Dual-Acting Capability: Hollow hydraulic rams can be designed to operate as dual-acting cylinders. This means that hydraulic fluid can be supplied to either end of the cylinder to extend or retract the piston, allowing for bidirectional movement and force generation.

Force Output: The force output of a hollow hydraulic ram is determined by factors such as the cylinder size, operating pressure, and piston area. The force generated can be utilized for pushing, pulling, lifting, or holding applications, depending on the specific design and application requirements.

Application Flexibility: Hollow hydraulic rams find applications in various industries and scenarios. They are often used in situations where a hollow passage is required, such as in hydraulic presses, tensioning systems, hydraulic jacks, and other applications where a through-hole is needed for passing cables, rods, or other components.

Mounting Options: Hollow hydraulic rams can be designed with various mounting options, such as threaded holes, flanges, or other connection methods, to facilitate easy integration into different systems or equipment.

Material Selection: Hollow hydraulic rams are typically constructed using materials such as steel or other high-strength alloys to withstand high pressures and provide durability. The choice of material depends on factors such as the operating conditions, load requirements, and environmental considerations.

Customization: Hollow hydraulic rams can be customized to meet specific application requirements, including stroke length, mounting options, and port sizes. This allows for tailored solutions that align with the intended use and system specifications.

When considering a hollow hydraulic ram, it is important to consider factors such as the required force output, stroke length, operating pressure, and compatibility with the hydraulic system. Consulting with a hydraulic system engineer or cylinder manufacturer can help in selecting the appropriate hollow hydraulic ram for your specific application needs.