CWT Butterfly Valve

When the handwheel or lever is operated, the motion is transmitted through the shaft and opens the butterfly disc.

For a lever-operated butterfly valve, a 90-degree turn opens the valve, with the lever then parallel to the pipe. If the lever is perpendicular to the pipe, the valve is open

• Advantages

• Butterfly valves have many advantages, which is why they are so common in plant piping today.
• The compact design needs less space than other valve types such as globe and gate valves.
• Butterfly valves are generally cheaper than other industrial valves, because the design needs less material. The cheapest type on the market is the wafer butterfly valve, fitted between two flanges.
• Quick, easy opening and closing
• Simpler, easier maintenance
• Light weight.
• Low pressure drop and high pressure recovery.

• Disadvantages:

• Only performs well in low-pressure service. At high pressure the valve is easily damaged and over time becomes prone to leakage.
• Butterfly valves are limited when throttling between 30 and 80 degrees open.

1. CWT butterfly valve types (Butterfly valve CWT)

• By construction
  • Concentric butterfly valve (Concentric Buttefly valve)
  • Eccentric butterfly valve

+ Doubel Offset

+ Triple Offset

1. Butterfly valve features

• Design standard ASME 16.34, API 609
• ASME 16.34, API 609
• Working pressure Class 150 ~ 600
• Size NPS 2” ~ 36”
• End connections Flange, BW, Lug, & Wafer Ends

1. Industrial applications of butterfly valves

Concentric or low-pressure, low-temperature butterfly valves and high-performance butterfly valves cover a wide range of applications. These include:

• Cooling water, air, gas and similar applications, such as fire protection and circulating water
• Corrosive services requiring lined valves
• Food, chemical and pharmaceutical processing
• Slurry and similar services
• Steam and high-pressure, high-temperature applications
• Throttling applications with low differential pressure, such as water supply or cooling air systems

1. Valve coding

To make classifying and ordering valves easier, CWT, drawing on many years of experience, has optimized and assigned codes to its valves and each valve accessory according to CWT’s standard as follows:

CAD supplies genuine CWT valves for industrial systems.

CAD’s staff are trained in depth by the manufacturer’s specialists. We provide technical consulting, repair and maintenance, and replacement of consumables right at your plant.

Please contact CAD’s specialists and sales team via:

Hotline: 0917.414.008

Email: cs@cads.vn

Choosing the type from the CWT catalogue

The CWT “Butterfly Valve” catalogue has three groups. The valve code is built from these fields: valve type, size, pressure, construction, ends, body material, trim material, seat material and operator.

Size, pressure and operation

• ASME Class 150, 300 and 600 (the triple offset flanged type has all three classes by size).
• Sizes in the code system: NPS 2 to 42; the specification on this page states NPS 2 to 36.
• Ends: flanged RF / FF / RTJ, butt weld (BW), lug and wafer.
• Operation: lever, gear, bare stem (for an actuator), handwheel, electric, pneumatic, hydraulic or solenoid. The catalogue tables use a gear operator from NPS 6 up.

What to send for a quote

• Valve type (concentric, double offset, triple offset), NPS size and Class rating.
• Medium, temperature, working pressure and differential pressure when closed.
• End type (flanged, lug, wafer, butt weld) and flange standard.
• Body and seat material and the operator (lever, gear, electric, pneumatic).
• Fire safe or zero-leakage requirements, if any, and quantity.

CAD replies with a quote within 24 working hours of receiving the details.