The NS-1 (NS-DN) is a simple and cost-effective Conical Spring Mechanical Seal, designed primarily for light working conditions in water supply systems. It is widely recognized as the standard replacement seal for Lowara centrifugal pumps.

This seal features an unbalanced, direction-dependent conical spring design. It is manufactured to meet fitting dimensions according to DIN 24960 (EN12756), ensuring easy installation and reliable performance in clean water applications.

Seal faces materials:

Rotating part:

• ceramics Al O (V)
• silicon carbide (Q1, Q2)

Stationary seat:

• carbon (B)
• silicon carbide (Q1, Q2)

Operation limits:

• p = 10 bar
• t = -20 … 180 °C
• v = 20 m/s
• Axial movement ±0,5 мм

Type: Conical spring mechanical seal
For pumps: Lowara
Replacement: Burgmann BT-FN (BT-FN.NU), AES T04 / T04D, Lowara