The Type 606 metal bellows mechanical seal is a direct interchange for John Crane® Type 606, designed for high-temperature and chemically aggressive services where conventional O-ring-mounted seals fail due to elastomer degradation. Its edge-welded metal bellows acts simultaneously as the spring element and secondary sealing member, eliminating dynamic elastomeric seals entirely.

The rotating bellows design incorporates drive lugs that transmit torque from the shaft sleeve to the rotary face, reducing torsional stress on the bellows convolutions—making it especially suitable for viscous media and frequent thermal cycling. Flexible graphite static packings provide a gas-tight seal at temperatures up to 425°C (800°F), while the all-metal construction resists coking, crystallization, and shaft fretting.

The 10k27 mechanical seal is a heavy-duty, welded metal bellows face seal designed specifically for top-entry reactor agitators in chemical, pharmaceutical, and petrochemical processes. It serves as a direct OEM replacement for common reactor seals, offering superior resistance to thermal cycling, high pressure, and corrosive media. With a temperature range up to 400°C (752°F) and available in Hastelloy® C276 or Inconel® 625 bellows, this metal bellows mechanical seal ensures leak-free operation even under vacuum or reverse pressure conditions. Whether you need a standard size or custom configuration, the 10k27 seal delivers reliable performance in glass-lined, stainless steel, and alloy reactors.

This wave spring seal is a modern solution for centrifugal pumps, designed for easy replacement. Its primary advantage is the combination of a PTFE bellows and a compact metal wave spring. The PTFE component provides excellent chemical resistance against highly corrosive media, acids, and alkalis, where standard elastomers would fail. 

• Edge-Welded Bellows: We use precision edge-welded leaflets which offer a higher stroke-to-length ratio and better fatigue life compared to formed bellows.

• Damped Vibration: The bellow structure inherently dampens stick-slip vibration, preventing face chattering at high temperatures.

This booster pump mechanical seal is a specialized high-performance solution designed to handle elevated temperatures and demanding operational conditions. As a metal bellows mechanical seal, it replaces traditional elastomer secondary seals with a durable, all-metal welded bellows. This innovative construction eliminates the risk of elastomer failure under thermal stress, ensuring long-term reliability. Engineered specifically as a high temperature mechanical seal, it reliably operates in hot oil, boiler feed, and chemical applications. 

Our metal bellows mechanical seal is available in standard small shaft sizes including 12mm mechanical seal, 14mm mechanical seal, 16mm mechanical seal, and 18mm mechanical seal configurations. The all-welded metal bellows design eliminates dynamic O-ring hang-up, making it suitable for hot water, light hydrocarbon, and chemical services on small centrifugal pumps and lab-scale mixers. Each size follows ISO envelope dimensions for direct OEM replacement. Custom face materials (SiC/TC/Carbon) and elastomers (Viton®/EPDM/Kalrez®) are available.

Direct Interchange: Perfect fit for OEM John Crane Type 606 dimensions.

Extreme Temperature: Reliable performance from -75°C to 400°C with standard Grafoil gaskets.

Stationary Bellows: Metal bellows mechanical seals are ideal for high-speed applications, eliminates centrifugal stress.

Standard Quench Ports: API Plan 62 ready to prevent coking and manage fugitive emissions.

• Direct Torque Transmission: Torque is transmitted directly through the bellow tail or drive collar, eliminating the need for drive pins that can wear out.

• Balanced by Design: The effective diameter of the bellow changes with pressure, providing a naturally balanced face load for varying pressures.

• Vibration Damping: The multi-ply bellow construction dampens the high-frequency vibrations often found in high-speed boiler feed pumps.

• Hydrodynamic Face Grooves (Optional): Faces can be laser-grooved to promote fluid film formation, preventing dry running in hot water.

• Self-Cleaning Rotation: The rotation of the bellow creates a strong centrifugal force that ejects solids from the seal cavity, keeping the faces clean.

• Double-Ply Options: Available in double-ply bellows for higher pressure ratings required in deep-well submersible applications.

As a specialized water pump shaft seal replacement supplier, MiaoYu Seals produces the metal bellows seal as a direct drop-in alternative to Roten Type 37 / Type E on European boiler feed and HVAC water pumps. Built with Inconel welded bellows and TC/SiC vs carbon faces, it eliminates elastomer hang-up in 180–200 °C condensate return, giving routine maintenance crews an OEM-level fit at roughly one-third the Roten brand cost. Shaft coverage 18–150 mm (0.75\"–6\"), ≤2.0 MPa, ≤23 m/s, NBR/EPDM/FKM secondary seals—exactly dimensioned for pump-shaft retrofit without machining the stuffing box.