Design

Dry gas seals provide contactless sealing solution for rotating shafts in high-speed equipment. Clean and dry air or inert gases are injected into a precise clearance between the shaft and seal housing, forming a stable gas film that serves as a non-contact barrier against external environment.

Without liquid or additional magnets, our dry gas seals feature simple and compact structure, adaptive sealing, and frictionless operation. The non-contact gas film eliminates wear and leakage issues associated with mechanical seals. Cooling effect and long service life are also achieved.

Our dry gas seals are customizable with multiple tandem seal stages for enhanced sealing performance. Various dimensions and mounting configurations are available to fit diverse equipment needs in aerospace, oil and gas, food and pharmaceutical, electronic and semiconductor industries.

Providing reliable, maintenance-free and environmentally clean sealing, our dry gas seals are ideal solutions for high-speed rotating machinery. Contact us today to find the optimal sealing for your application!

Dry Gas Seal Components
Dry gas seals are a dry gas seal types predominantly used in rotary equipment such as compressors and turbines, where they seal the shafts against gas leaks. They are called "dry" because they operate without lubricating oil in the sealing environment, relying instead on a gas (often the process gas itself) as a lubricant. This design helps minimize contamination and is particularly beneficial in applications where environmental regulations restrict emissions.

Key Components of Dry Gas Seals:
Seal Faces:
Primary Seal Ring (Rotating Seal Face): This component is attached to the shaft and rotates with it. It is typically made from hard materials like silicon carbide or tungsten carbide to withstand the operational conditions.

Mating Ring (Stationary Seal Face): This ring remains stationary and is mounted to the seal housing. It is made from similar hard materials as the primary seal ring to ensure durability and resistance against wear.

Secondary Seals:
O-rings or Bellows: These provide a static sealing function between the moving parts of the seal and the stationary parts. Materials used for secondary seals include elastomers like Viton, PTFE, or other polymers, depending on the temperature and chemical properties of the gas.

Seal Housing:
This component holds the stationary parts of the seal and is connected to the casing of the machine. It is designed to withstand the pressure and chemical environment of the application.

Spring (or Springs):
These are used to maintain the force needed to keep the seal faces together. Springs can be a single coiled spring, multiple springs, or a wave spring, depending on the design.

Gas Panel (Control System):
The gas panel regulates the supply and pressure of the gas used in the seal. It ensures that the seal operates under optimal conditions by providing a clean, dry, and appropriately pressurized gas barrier between the seal faces.

Labyrinth Seals:
These are non-contacting seals that prevent the migration of gas from high-pressure areas to low-pressure areas. They work by creating a tortuous path for the gas, reducing its pressure through a series of ridges and grooves.

Sleeve or Shaft Sleeve:
This component fits over the shaft to provide a smooth and compatible surface for the rotating seal face to run against. It protects the shaft from wear and corrosion.

Distance Piece:
This part separates the process gas side from the atmospheric side, helping to maintain the integrity of the seal environment.

Functioning of Dry Gas Seals:
The operation of a dry gas seal involves a thin film of gas (usually the process gas itself) that is maintained between the rotating and stationary seal faces. The gas film is controlled in thickness by the gas panel system, which injects gas at a pressure slightly higher than the process pressure. This film not only acts as a lubricant to reduce wear and heat generation but also effectively seals the high-pressure gas within the machinery, preventing leaks.

Dry gas seals are highly efficient, reduce emissions, and are crucial in applications where environmental safety and operational efficiency are paramount. They are especially favored in the oil and gas industry, chemical processing, and places where the purity of the process medium is critical.