A compressor packing case is a component used in reciprocating compressors. Reciprocating compressors are devices that compress gas through reciprocating motion. The packing case is a critical part of the compressor's sealing system. It houses the packing elements which create a seal around the compressor piston rod as it moves back and forth.

The purpose of the packing case is to prevent gas from leaking out of the compressor cylinder during the compression process. It also keeps contaminants from entering the cylinder, ensuring the compressor operates efficiently and reliably.

The packing case typically contains multiple layers of packing materials, such as rings or seals, which are compressed against the piston rod to create a tight seal. These packing materials may be made of various materials, including synthetic rubbers, plastics, or metals, depending on the specific requirements of the compressor and the gases being compressed.

Overall, the compressor packing case plays a crucial role in maintaining the integrity of the compression process and preventing leakage, which is essential for the efficient operation of reciprocating compressors in various industrial applications.

Compressor Packing Case
Compressor Packing Case Drawing

Compressor Packing Case

Description
Packing case design and manufacturing are crucial for reliable and efficient reciprocating compressor operation. Packing cases house a series of packing rings and seal high-pressure gas from exiting the cylinder along the path of the piston rod. DONGYI offers pressure, intermediate, and wiper assemblies tailored for all reciprocating compressor applications, utilizing a wide material range, reliable ring design, and top-notch engineering. Design considerations include gas type, operating pressure, temperature, compressor size, and stroke.

Compressor Packing Assembly
Compressor Packing Assembly
Compressor Packing Assembly

Compressor Packing Assembly

Description
Maximize your compressor’s performance with reliable packing cases and assembly from a trusted manufacturer and supplier. DONGYI’ high standards and expertise in precision manufacturing provide heavy duty, reduced-wear and corrosion-resistant packing cases with optimal heat conductivity for the most efficient operation. Our packing cases are painstakingly engineered to protect your cylinders from environmental contaminants and to prevent debris from entering the cylinder.

Our company designs and manufactures a full line of compressor packing cases, intermediate partition packing cases and wiper cases for your reciprocating compressor’s piston rod sealing system.

Precision machined from cast iron, bronze alloy steel or stainless steel.

All packing and wiper cases are designed to be easily reconditioned when needed to maximize service life.

Available in cooled or non-cooled for use in both oil-free and lubricated applications to satisfy the full spectrum of temperatures, pressures and corrosive conditions.

Designed to meet all environmental concerns and regulations including available vent and purge designed assemblies for fugitive emissions reductions.

The packing case assembly is critical to the proper operation of the piston rod packing and the sealing of the cylinder. The packing case has several important features that help to maximize your compressor’s performance:

  • Cylinder-end gasket to prevent process gas from bypassing the packing rings
  • Precision-machined mating and sealing surfaces to prevent leakage
  • Provides passages for lubrication, vent, coolant and buffer gas as required
  • Flange with adequate bolting to maintain gasket seating and seal between cups at operating pressure
  • Recess in each cup to contain free floating seal rings

With the ever increasing concern for the effects upon the global environment, systems to control emissions are becoming even more important. As part of its commitment to its customers and the environment, our company has a range of purge control systems that maintain buffer pressure and monitor gas flow and packing condition to eliminate emissions from packing cases used in reciprocating compressors. The purge-gas system prevents your process gas from escaping through the packing case by introducing an inert buffer gas into the assembly.

Packing case conversion

We can convert your existing case to a purge design. Converting your packing case to a purge-gas system allows you to monitor your packing ring life and comply with tough emissions regulations. Our standard purge design employs a two groove T-cup. If the length of the assembly is limited, a single groove cup arrangement is used.

Each Dongyi packing case consists of a flange and a series of annular cups containing recesses for the packing rings. The type and material of the rings varies based on service conditions.

For up to about 2,000 psi (140 bar), the case material is normally cast iron, or Ni-Resist iron if the application involves corrosive gases. Steel or stainless steel is most common for higher pressures.

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