Butterfly Valves

Wafer Pattern Butterfly Valve Cast Iron Body, Ductile Iron Disc, EPDM Liner

Wafer Pattern Butterfly Valve Cast Iron Body, Ductile Iron Disc, EPDM Liner

Regular price £21.35
Wafer Pattern Butterfly Valve WRAS Approved

Wafer Pattern Butterfly Valve WRAS Approved

Sale price £26.45
Save £19.40
Lugged PN16 Pattern Butterfly Valve WRAS Approved

Lugged PN16 Pattern Butterfly Valve WRAS Approved

Sale price £30.45
Save £6.09
PN16 Lugged Butterfly Valve Ductile Iron Body Stainless Steel Disc NBR Liner

PN16 Lugged Butterfly Valve Ductile Iron Body Stainless Steel Disc NBR Liner

Regular price £47.60
Hygienic Butterfly Valves

Hygienic Butterfly Valves

Sale price £55.85
Save £21.00
PVC-U Wafer Butterfly Valve

PVC-U Wafer Butterfly Valve

Sale price £87.64
Save £9.74
Wafer Pattern High Performance Butterfly Valve

Wafer Pattern High Performance Butterfly Valve

Sale price £441.61
Save £237.79



Butterfly Valves

Butterfly valves are simple yet versatile valves. They are quarter turn operated valves which are commonly used in multiple industries for varied applications.  Quarter turn operation ensures quick operating of the valve.  In the open condition there is minimum obstruction to the fluid flow through the valve as the flow passes around the disc aerodynamically.  This results in very low pressure drop through the valve.  Due to its unique mode of operation, the valve can be actuated easily without requiring high torques and wear and tear. 

Butterfly valves work similarly to ball valves, rotating the handle, either manually or with an actuator, turns the disc perpendicular or parallel to the flow of the fluid. Butterfly valves can also be used for regulating flow by adjusting the lever and keeping a close eye on the desired output flow.  Due to lack of friction, use of bulky actuators can be avoided. 

Another advantage offered by butterfly valve is their compact size.  The valve is quite compact, resembling a metal disc.  This makes their installation very easy. They can be used to handle slurries and fluids with suspended solids as there are no cavities for deposition of solid particles inside the valve body.  Butterfly valves are less expensive and generally lighter weight than other types of valves.  A butterfly valve for a large diameter pipe is much smaller than its ball valve equivalent. Butterfly valves, like ball valves, operate with a 1/4 turn. They are generally used for handling large flows of gases or liquids, including slurries, but should not be used for throttling for extended periods of time. They are used as throttling valves to control flow. Butterfly valves offer a rotary stem movement of 90 degrees or less in a compact design. Unlike ball valves, butterfly valves do not have pockets in which fluids and gas may become trapped when the valve is closed.


Butterfly Valves Explained:

Butterfly Valves are simple & yet versatile valves. They enable quick shut off of pipeline flow.

They are quarter turn operated valves which are commonly used in multiple industries for varied applications. Quarter turn operation ensures quick operating of the valve. In the open condition there is a minimum obstruction to the fluid flow through the valve as the flow passes around the disc aerodynamically. This results in a very less pressure drops through the valve.

 Due to its unique mode of operation, the valve can be actuated easily without requiring high torques and wear & tear. Due to lack of friction, use of bulky actuators should be avoided. Butterfly valves work very similarly to ball valves. Rotating the handle, either manually with a pneumatic system, turns the plate perpendicular or parallel to the flow of the fluid. Butterfly Valves can also be used for regulating flow by adjusting the lever & keeping a close eye on the desired output flow.

An advantage offered by Butterfly Valves is their compact size, the valve is quite compact resembling a metal disc. This makes their installation very easy. They can be used to handle slurries & fluids with suspended solids as there are no cavities for deposition of solid particles inside the valve body.

Butterfly valves are less expensive & generally lighter weight than other types of valves. They are made in various materials such as Carbon Steel, Cast iron, Ductile Iron, PVC-U & Stainless Steel & some have specific approvals such as WRAS Approval for example depending on the requirements of what they are going to be used for.

 A Butterfly Valve for a larger diameter pipe is much smaller than its ball valve equivalent. Butterfly Valves like ball valves operate with a ¼ turn. They are generally used for handling large flows of gas or liquids, including slurries but should not be used for throttling for extended periods of time. Butterfly Valves control the flow of steam with a disc which turns on a diametrical axis inside a pipe, or by 2 semi-circular plates hinged on a common spindle, permitting flow in only one direction. They are used as throttling valves to control flow. They offer a rotary stem movement of 90 degrees or less in a compact design. Unlike ball valves, Butterfly Valves don’t have pockets in which gas & fluid may become trapped when the valve is closed.

 

Do Butterfly Valves Need Gaskets?

Even wafer style valves require 2 flanges. These should be the same size as your valve & may be one piece or loose ring style flanges. This will allow the surrounding pipeline to connect snugly with the Butterfly Valve. Most Butterfly Valves don’t require extra gaskets.


Types of Butterfly Valves:

There are various different types of Butterfly Valves, however they fall into 2 basic types: Lug & Wafer. The difference between a Lugged & a Wafer Butterfly Valve is only the mounting scheme.

Lug Type valves as the name suggests has lugs that are used to mount the valve to lugs that are attached to the flanges on the ends of sections of pipe, so that each length of pipe can be removed & replaced independently. Butterfly Valves come with different liner/seal materials depending on the requirements such as EPDM, NBR, Viton, Silicon etc, the most commonly used are:

EPDM – Is one of the liner/seal materials used for a Butterfly Valve, EPDM is used extensively in HVAC Industry due to its resistance to polar compounds such as water. Phosphate, esters, ketones, alcohols & glycols. Generally used in the Water Industry.

NBR- Is the liner/seal material, it provides good abrasion resistance properties & compatibility with solvents, oil, water & hydraulic fluid for temperatures up to 80 degrees Fahrenheit. Generally used in the Oil Industry.

Hygienic Butterfly Valves: Hygienic Butterfly Valves are for use in the Food, Dairy, Brewery Industry & other general hygienic process applications.

     High Performance Butterfly Valves: Can be used for shut off & throttling control. They are designed to handle everything from general applications to viscous & corrosive liquids; corrosive gases and steam.