NP E NT CONCENTRIC BUTTERFLY VALVE SERIES

NP E NT CONCENTRIC BUTTERFLY VALVE SERIES

The NP and NT Concentric Butterfly Valves have been specially developed for applications with corrosive fluids with a PTFE seat, with excellent performance, easy maintenance and interchangeability of components.

NP Series: 1½” to 12” (40 to 300mm)

NT Series: 14” to 24” (350 to 600mm)

Catalog

description

> Construction Standard

API 609 Category A.

> Face to face

API 609 Category A

ISO 5752 Col. 20

MSS SP-67 (Except DN 16″ and 18″)

> Body Connection

Wafer, Lug and Flanged body cast in monoblock with a ring integrated into the body in the Wafer type in the NP series or semi-lugs in the NT series, which allow the correct centering of the valve between flanges. Its long neck allows the thermal insulation of the pipe.

> Disc

The disc's thin profile provides a higher Cv than those with a through shank, resulting in less pressure drop. The disc edge is hand polished, producing low torque, tight sealing and a longer seat life.

> Upper and lower rod

The disc x rod connection is made through a square fitting. The result is a system that uses no pins, plugs or screws, eliminating the possibility of leakage through these components.

The top stem and top flange in compliance with ISO 5211 and DIN 3337 standards, provide secure connection with manual, pneumatic, electric and other actuators. A rod retention system guarantees the rod's anti-expulsion feature.

> Bearings

Polypropylene (NP) and bronze (NT) bearings eliminate friction between the body and the rod, providing low torque and a long rod life.

> Seat  

The seat completely covers the body, preventing fluid contact with the body. A gasket is not required for the installation between flanges. The seat extends face-to-face from the body, sealing the body and the pipe flanges.

The elastomer is vulcanized to a rigid ring, forming a “cartridge” that provides:

• Easy installation, no specific disc position is required
• Eliminates high torque and premature seat failure caused by elastomer distortions
• Simplifies seat replacement as no special tools are required
• High strength for vacuum services. The stem seal is made through the disc contacting the seat and through two semi-o'rings molded into the stem bore