Disc and Stem Connection
Features a high-strength through stem design. The close tolerance connection that drives the valve disc is a special feature of the FLSmidth valve. It eliminates stem retention components being exposed to the line media, such as disc screws and taper pins, which commonly result in leak paths, corrosion, and vibration failures. Disc screws or taper pins, due to wear and corrosion, often require difficult machining for disassembly. Disassembly of the FLSmidth stem is just a matter of pulling the stem out of the disc. Without fasteners obstructing the line flow, the Cv values are higher than many other valves, turbulence is reduced, and pressure recovery is increased. The stem ends and top mounting flange are standardized for interchangeability with FLSmidth actuators.

Disc
Casting is spherically machined, hand polished to provide a bubble-tight shut off, minimum torque, and longer seat life. The disc O.D. clearance is designed to work with all standard piping.

Stem Retaining Assembly
The stem is retained in the body by means of a unique Stainless Steel retaining ring, a thrust washer and two C-rings, manufactured from brass as standard, stainless steel upon request. The retaining ring may be easily removed with a standard hand tool. The stem retaining assembly also prevents accidental removal of stem during field service.

Stem Bushing
Non-corrosive, heavy duty acetal bushing absorbs actuator side thrusts

Stem Seal
Double "U" cup seal design is self adjusting and gives positive sealing in both directions. Prevents external substances from entering stem bore.

Neck
Extended neck length allows for 2” of piping insulation and is easily accessible for mounting actuators.

Primary and Secondary Seals
The Primary Seal is achieved by an interference fit of the unique molded seat flat with the disc hub. The Secondary Seal is created because the stem diameter is greater than the diameter of the seat stem hole. These seals prevent line media from coming in contact with the stem or body.
Type SB & USB Maximum Temperature 250°F (121°C)
Type SB & USB wafer-style Butterfly Valve for gas service only, reduced diameter disc, ANSI class 125/150, 80% vacuum to 50 PSI differential pressure, cast iron body, phosphatecoated D.I. disc, 416 stainless steel shaft, EPDM seat
Type HB & UHB Maximum Temperature 400°F (205°C)
Type HB & UHB wafer-style Butterfly Valve for gas service only, reduced diameter disc, ANSI class 125/150, 80% vacuum to 50 PSI differential pressure, cast iron body, phosphatecoated D.I. disc, 416 stainless steel shaft, VITON seat

FLSmidth Unique Seat Design
One of the valve's key elements is the unique tongue-and-groove seat design. This resilient seat features lower torque than many valves on the market today and provides complete isolation of flowing media from the body. The tongue-and-groove seat to body retention method is superior to traditional designs, making field replacement simple and fast. The seat is specifically designed to seal with slip-on or weld-neck flanges. The seat features a molded O-ring which eliminates the use of flange gaskets. An important maintenance feature is that all resilient seats for FLSmidth butterfly valves are completely interchangeable.

Actuator Mounting Flange and Stem Connection
Universally designed to ISO 5211 for direct mounting of FLSmidth power actuators and manual operators.

Flange Locating Holes
Provides quick and proper alignment during installation.

Body
One-piece wafer style. Polyester coating for excellent corrosion resistance. FLSmidth valve bodies meet ANSI pressure ratings for hydrostatic shell test requirements.

Design Features
The FLSmidth Butterfly valve is a wafer version with flange locating holes. All FLSmidth valves are tested to 110% of full pressure rating before shipment. A major design advantage of FLSmidth valve product lines is international compatibility. The same valve is compatible with most world flange standards - ANSI Class 125/150, BS 10 Tables D and E, BS 4504 NP 10/16, DIN ND 10/16 AS 2129 and JIS 10. In addition, the valves are designed to comply with ISO 5752 face-to-face and ISO 5211 actuator mounting flanges. Therefore, one valve design can be used in many different world markets. Due to a modular concept of design, all FLSmidth handles, manual gear operators, and pneumatic and electric actuators mount directly to FLSmidth valves. No brackets or adapters are required. The standard FLSmidth design includes the pneumatic actuator. FLSmidth interchangeability and compatibility offers you the best in uniformity of product line and low-cost performance in the industry today.

Polyester Corrosion Protective Coated
FLSmidth’s standard product offers valve bodies with a polyester coating, providing excellent corrosion and wear resistance to the valve’s surface. The FLSmidth polyester coating is a hard, gloss finish. Chemical Resistance - resists a broad range of chemicals including: dilute aqueous acids and alkalies, petroleum solvents, alcohols, greases, and oils. Offers outstanding resistance to humidity and water Weatherability - outdoor tested, resistant to ultra-violet radiation Abrasion Resistance - excellent resistance to abrasion Impact Resistance - withstands impact without chipping or cracking
 
Butterfly Valves @ FL Smidth.com