Showing posts with label Butterfly valve. Show all posts
Showing posts with label Butterfly valve. Show all posts

Wednesday, December 12, 2018

Metal Seated High Performance Butterfly Valves

Neles BW series
Metso Neles BW Series
The Metso Neles BW series metal seated high performance butterfly valve with one-piece body design, is designed for both control and tight shut-off applications. Multiple body options makes it particularly well suited for the refining, power, petrochemical and chemical industries.

DOWNLOAD THE BW SERIES SPECIFICATION SHEET HERE

The BW provides extended operational life in control, tight shut-off and critical applications such as high cycle, high temperature, cryogenic, oxygen and abrasive applications, etc. Rating from ASME 900 to 2500 makes the BW a sound control or shut-off valve in severe service applications.

Excellent on-off capabilities
  • Uniquely functioning full metal seat design assures tightness over long time periods.
  • Contact between disc and seat is mechanically induced and does not rely on assistance from differential pressure.
  • Long term tightness is maintained even in high cycle rate services. Tightness in not compromised by large thermal cycling either.
  • Low friction and excellent wear resistance.
  • Lowered operational torque reduces actuator size
  • Heavy-duty stem and ingenious bearings design extends service life and is insensitive to thermal cycles and impurities.
Excellent flow control capabilities
  • Good controllability via smoothly rising installed characteristic curve at both very small openings and nearly full Cv positions. Series BW provides very wide rangeability in fairly low pressure drop services.
  • Good dynamic stability in both flow directions.
  • Available with a variety of actuators, positioners and accessories for single source responsibility. Mounting face according to ISO 5211.
  • Abrasion resistant construction
  • Solid, sturdy all metal seat design is based on metal-to- metal contact. No resilient parts are needed for seating.

Low emissions

  • The live loaded gland packing is located right after the outer bearing maximizing the tightness. The emissions are well below the international standards.
  • Furthermore, there are no resilient parts exposed to the medium.
Extremely wide pressure and temperature range
  • Differential pressure/temperature ratings in accordance with ASME B16.34.
  • Extremely wide temperature range up to +1150°C / +2100 °F.
  • Low cost of ownership
  • Extremely high cycle life minimizes the need for maintenance, and increases Mean Time Between Failure (MTBF) value.
  • Interchangeable seat can be replaced without disassembling the disc and shaft. Seat replacement does not require any adjustment or special tools.
  • Certified emission and fire safe performance
  • Emission certified according to industry standard, ISO 15848-1 class B in shut-off applications.
  • Fire safe certification according to API 607, 6th edition 
Certified safety performance
  • SIL certification to meet IEC61508 requirements 
  • Capable to SIL 3 level
Applications

The BW series butterfly valve is suitable for the following industries and applications.
  • Chemical Process: Tail gas, waste water, Flue gas, styrene, acrylic acid
  • Refinery: Flammable media, process, gas
  • Off-shore: Flammable media, process, gas
  • Steel: Gas and crude gas
  • Gas: Natural gas, sour gas
  • Nuclear power: Steam, gas, water
  • Conventional power: Steam, gas, water
For more information about the Neles BW Series, contact Mead O'Brien at (800) 892-2769 or visit their web site at https://meadobrien.com.

Monday, November 21, 2016

Triple Eccentric Disc Valve, Metal Seated, with Flow Balancing Trim

Triple Eccentric Disc Valve Metal Seated with Flow Balancing Trim
Neles Triple Eccentric Disc
Valve, Metal Seated with
Flow Balancing Trim

TRIPLE ECCENTRIC SEATING PRINCIPLE

The disc of the valve is machined to close tolerances to create an elliptical shape similar to an oblique slice taken from a solid metal cone. When the valve is closed, the elliptical disc at the major axis displaces the seat ring out- ward, causing it ring to contact the disc at the minor axis. When the valve is opened, the contact is released and the seat ring returns to its original circular shape.

CONTROL STABILITY AND SUPERIOR TIGHTNESS

The S-DISC® control valve unit provides outstanding control performance and excellent long-lasting tightness in the same valve. The very simple and robust construction guarantees long trouble-free operation and maximum reliability.

The S-DISC design consists of a standard NELDISC® triple eccentric disc valve equipped with a flow-balancing trim. The trim has been located on the downstream side of the valve body. The ingenious idea of this design is to transfer fluid forces out of the disc to the body. 
triple eccentric disc valve

triple eccentric disc valveFigures 2 and 3 illustrate the flow treatments with a concentric-type conventional butterfly valve compared to the S-DISC-design. The S-DlSC design offers stable flow control and reduced dynamic torque, noise level and vibrations. The dynamic behavior of the valve is very smooth and stable, which means less load on the shaft bearings, less required torque, smaller actuators and more economical control unit total costs. All of the excellent features of the standard NELDISC are available.

The most standard NELDISC can be easily modified to the S-DISC design, just by changing the flange ring.


FEATURES
  • Excellent flow and control performance.
  • Wide temperature range from -200 ... +600 °C /-330 ... +1110 °F.
  • Reduced dynamic torque and noise.
  • Mechanical and flow dynamic stability allows higher pressure drop service than a conventional disc.
  • ASME 150/PN 20, ASME 300/PN 40 and ASME 600/
  • PN 100.
  • Sizes DN 80...1500/3"...60"
For more information, visit http://www.meadobrien.com or call (800) 892-2769 for immediate service.