Butterfly Valves

Curtiss-Wright Valves Division offers butterfly valves from its Solent & Pratt and Valve Group - Korea product brands. Butterfly Valves isolate or regulate the flow of fluid by using a closing mechanism with a rotating disc. These valves allow for a cost-effective and lightweight solution. 

Among the valves on offer are Double Block & Bleed, Triple Offset Segment Values that provide absolute shut-off and PTFE Sealed Fire-safe Valves. These systems, as well as an absolute commitment to outstanding quality and reliability, have assisted our successes in supplying engineering projects globally. 

We offer high-performance butterfly valves (HPBV) with a variety of custom features:

  • Soft seating or ebonite-lined designs in sizes 2" (50 mm) to 138" (3400 mm)
  • Metal-seated
  • Zero leakage
  • Bi-direction triple offset segment valves (TOSV) in sizes 2" (50 mm) to 84" (2100 mm) in pressure classes up to ANSI 1500# with fully rated trims. 

Our range also includes cryogenic, double block & bleed and our unique triple offset gate valve series.

View our full range of valves below:


 

Butterfly Valves: The Basics: Operation & Functionality

Butterfly Valves isolate or regulate the flow of fluid by using a closing mechanism with a rotating disc. These valves allow for a cost-effective and lightweight solution. Curtiss-Wright Valve Group offer butterfly valves from its Solent & Pratt and Valve Group - Korea product brands.

The operation of a butterfly valve is very similar to a ball valve. The ‘butterfly’ is a metal disk positioned in the centre of the pipe, mounted onto a rod that passes through the disk to an actuator on the outside of the valve. However, unlike a ball valve, the disk is always present within the flow, resulting in a slight drop pressure drop even when fully open, this is offset by lower costs and smaller size when used in larger diameter pipes.

Turning the disk once the valve is closed blocks off the passageway, but doesn't create as complete a seal as some alternatives, making options such as globe valve's a better fit for controlling gas flows. A full open valve allows the disk to rotate at a quarter turn giving unrestricted passage for the fluid.


Zero-Offset Butterfly Valve

Known for their concentric design, zero-offset butterfly valves rely on the flexibility of rubber to create a seal. The valves have the lowest pressure rating and include a stem and disk which are centred in the seat and body of the valve. The fully protected seat is used to reduce the risk of any solids damaging the seating surface.

Applications Zero-Offset Butterfly Valve

A zero-offset butterfly valve is commonly used in applications such as handling:

 

  • Chemicals
  • Coatings
  • Abrasive 
  • Food

High-Performance Double Offset Butterfly Valves

Used mainly for their shut off and throttle control, high-performance double offset butterfly valves are designed to handle anything from general applications to corrosive liquids and gases. A double offset is used for higher pressures than the zero offset valves.

 

Valve Design

The valve has two stems offset from the centre creating a cam action when in use. One is offset from the centre line of the disk seat and body seal. The seat is lifted out of the seal reducing friction resulting in less wear. The other is offset from the centre line of the bore.

Applications Zero-Offset Butterfly Valve

A double offset butterfly valve is commonly used in:

 

  • Power generation
  • Chemical
  • Oil
  • Gas
  • Wastewater treatment
  • Shipbuilding

Triple Offset Butterfly Valve

Similar to the positioning of a double offset valve, the triple butterfly valve also has a third offset due to the positioning of the seating surface. Using this method allows the disc to seal against the seat without causing any friction.

The uniform sealing allows for a tight shutoff in a metal seat design, and is popular for its low cost and low torque requirements.

Applications Triple-Offset Butterfly Valve

A triple offset butterfly valve is commonly used for:

 

  • High-pressure steam
  • Superheated steam
  • High-temperature gases and oils

Curtiss-Wright Butterfly Valve Products

TOSV - QUARTER TURN - TOSV™, TOGV - QUARTER TURN - TOGV™, TOSV - DOUBLE BLOCK & BLEED TOSV, R-SERIES - RESILIENT SEAL BUTTERFLY VALVES, E-SERIES - EBONITE LINED BUTTERFLY VALVES,3000C1-BV - C1 BUTTERFLY VALVE, T-SERIES - PTFE SEALED FIRESAFE VALVE


FAQ

What are the differences between check valves, gate valves and butterfly valves?

  • A check valve is a two-port valve allowing the flow of liquid or gas, to flow in only one direction, most work automatically with no control.
  • A gate valve can be fully open or fully closed by a barrier (gate) which lifts up and down, the flow can’t be adjusted. 
  • A butterfly valve uses a closing mechanism with a rotating disc to isolate or regulate the flow of fluid. 

 

What are butterfly valves used for?

Butterfly valves are used in chemical, pharmaceutical and food industries, the valve is used to interrupt product flow causing separation of a solid, liquid or gas. If a valve is used in these industries it is often manufactured according to cGMP guidelines (current good manufacturing practices).