YH604/YH609系列

The Type YH604 is the leading seal of choice for demanding, high temperature applications. Available in either AM350 or Alloy 718, its high-strength design provides maximum reliability. The stationary bellows design accommodates high shaft-to-seal-chamber misalignment.

Unlike rotating seals that must flex on every revolution to accommodate shaft-to-seal-chamber misalignment, the stationary YH604 adapts to this condition by flexing only once during installation. This reduces seal movement, resulting in increased seal life.

The Type YH609 incorporates all of the rugged features of the Type YH604, but is intended for those demanding applications where a dependable, high-strength, rotating seal is preferred. A narrow cross-section design enables the Type YH609 to fit in the most popular pumps without expensive and time-consuming seal chamber modifications. This makes it the ideal seal for heat transfer, hydrocarbon, and other applications that commonly use pumps with limited seal chamber clearances.

Performance Capabilities

Pressure:   Vacuum to 25 bar / 360 psi

Vacuum to 69 bar / 1,000 psi with DOUBLE-PLY bellows

Speed:  Up to 25 m/s / 5,000 fpm for Types YH606 and YH609

Up to 50 m/s / 10,000 fpm for Type YH604

Temperature:        -75°C to +425°C / -100°F to +800°F

Materials of Construction

Bellows:   Heat-Treated AM350 (UNS S35000), Alloy 718 (UNS N07718)                         

Shell/Primary Ring:  Alloy 42 (UNS K94100)                     

Adapter ::    Alloy 625 (UNS N06625) with Alloy 718 bellows

347 Stainless Steel (UNS S34700) with AM350 bellows

Faces: Carbon, Tungsten Carbide, Silicon Carbide

Static Seals: Flexible Graphite

DOUBLE-PLY for High-Pressure Applications

The Yonghua High-Temperature Series seals also come with DOUBLE-PLY bellows for high-pressure applications. For more information, contact Yonghua Group Engineering.