HDN (Heavy Duty Narrow Mechanical Seal)

Single Rotary Seals

The SEPCO HDN seal is an inside balanced rotary seal designed for general service. Its beefy cross-section resists distortion at higher operating parameters, yet fits narrow stuffing boxes. Various stationary seat ring designs and materials allow for ease of interchangeability.

Dynamically Balanced: The hydraulic balance is achieved within component parts of the unit. This eliminated the need for special shaft sleeves or costly shouldered shafts.

No Shaft Fretting: Static O-ring eliminated shaft / sleeve wear.

Reusable Sleeves: Since you can reuse your old pump sleeves, this seal can save on the cost of sleeve replacement.

Repairable in the Field: O-rings, springs and new seal faces can be installed in your own shop. This reduces costly inventory while providing consistency and performance of repaired seals.

Isolated Springs: Springs are located out of the fluid away from clogging particles and corrosive penetration.

Ease of Installation: One working dimension common to all HDN seals.

Metal Parts:
Standard Metal Parts: 316 SS
Standard springs and drive pins: Hastelloy C
Standard set screws: 316 SS

Face Materials:
Standard face: High quality chemical grade carbon / graphite.
Also available: Solid nickel bound tungsten carbide and SEPCO carsil.
Standard O-ring materials: Vitron and EPR

Pressures: 300 p.s.i. (g) / 21 Kg/cm Maximum delta P

Temperatures: To 400°F / 204°C