Skip to content


Conventional dry gas seals are compression seals designed for high-pressure applications. They’re called dry gas seals because of the dry gas that is injected into them to create a dynamic buffer within the seal.

Stein makes dry gas seals for lower-pressure applications involving compressors, turbines, process equipment, gearboxes, etc. Our superior design for these seals incorporates a patented spring-loaded mechanism for greater resilience.

There are different kinds of gas seals. All of them are buffer or dry gas. In a buffer seal, gas is injected into a chamber of the seal. If that chamber is segmented, the gas forms a buffer in the center, creating a dynamic between the outer and inner sides, or processes, of the seal. Different sealing elements, either buffer or dry gas, are used to achieve this.

Buffer seals are designed to leak a controlled amount of gas lubricant, while dry gas seals are designed not to leak at all. The Stein dry gas seals incorporate low- to zero-emissions and dual-buffer gas designs.


Stein offers a fully sealed, buffered gas circumferential–a spoiled joint gas circumferential–which permits one side to leak more than the other. When the two sides of the pump operate at different pressures, the “spoiled” joint permits leakage between the two chambers to equalize the pressure during operation.

The design of Stein’s dry gas seal assembly integrates transition-control technologies; the seal transitions to a contacting seal and back to wet mode during gas disruptions for greater sealing reliability and reacts dynamically to process pressure changes with minimum heat generation.


A traditional dry gas seal can run anywhere from $30,000 to over $100,000. Stein Seal dry gas seals, designed for lower pressure, are generally priced from $7,000 to $30,000.

The Stein company has been custom designing and engineering mechanical sealing systems for over 65 years. Stein dry gas seals are compatible with even the harshest applications, including syngas and ammonia.

Because Stein dry gas seals are custom-designed, they can be made to fit into irregular equipment envelopes that cannot accommodate standard dry gas seals. Stein dry gas seals can be customized to accommodate pressure, temperature, and other operational variants.