China Butterfly valve manufacturer,factory and supplier-Butterfly valve
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Butterfly valve

Butterfly valve introduction

A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start flow.Butterfly valve is easy and fast to open. A 90° rotation of the handle provides a complete closure or opening of the valve. Large Butterfly valves are usually equipped with a so-called gearbox, where the handwheel by gears is connected to the stem. This simplifies the operation of the valve, but at the expense of speed.
A butterfly valve is a mechanism that regulates the flow of materials within large pipe diameters by the quarter-turn rotation of a disc.
A rod feeds through the center of a disc and this rod is connected to an actuator that controls the motion of the disc. The disc position is either parallel or perpendicular to the flow of media. A butterfly valve differs from other valves because the disc is always in the flow causing a pressure change for any position of the valve.


A butterfly valve regulates flow by starting, slowing, or stopping media. The disk opens and closes with a low-torque rotation of 90 degrees and works for any compatible application. Because they cost less and are lighter weight, the butterfly valve is often preferred over other types of valves.
For some processes, extreme temperatures and corrosion are factors that would easily compromise a valve’s seal. The butterfly valve withstands extreme cold or extreme heat. This means the seal maintains its integrity which is critical for high-stakes applications such as energy production and petroleum processing (as one leak could threaten public safety or the environment).

 

Butterfly valve working principle

The butterfly valve is classified as a quarter-turn valve. It works like a ball valve for quick shutoff, but unlike a ball valve, the butterfly valve can also open and close incrementally. This difference means that the disc is always present in the flow and allows for a drop in pressure.
This disc is mounted at the center of the pipe. Disc movement is controlled by a rod inserted through the disc and an actuator, located outside the valve. Turning the actuator positions the disc either perpendicular or parallel to the flow. 

The butterfly valve is installed with the valve stem oriented vertically with the actuator directly above it, but in some cases, the stem is situated horizontally instead. When connected to a pump or check valve, there must be clearance for the disc so it doesn’t interfere with other parts nearby.


Butterfly valve types

Concentric 

This is the most basic kind of butterfly valve. Sometimes called the centric valve or the zero offset butterfly valve, the stem passes through the centerline of the disc and through the center of the pipe. Also known as the resilient-seated butterfly valve, sealing depends on how efficient the seat is during closing. This kind of butterfly valve is used for low-pressure applications.
 

Eccentric

The stem of the eccentric type does not pass through the centerline of the valve. Rather, it is placed behind the face of the disc which is opposite of the flow direction. 
1 Single Offset
The single offset only has the stem attached at the back of the disc. This enables lesser disc-to-seal contact before full closure. This is to ensure a better and longer life service of the disc.
2 Double Offset
A double offset type has the stem located at the back of the disc. There is an offset present on the other side of the disc. This further limits the contact of the disc and the seat to about 1-3 degrees. The double offset butterfly valve is suitable for high-pressure applications that need a bubble-tight sealing.
3 Triple Offset
The triple offset butterfly valve has an additional offset located at the axis of the disc and seat, apart from the ones already mentioned in the double offset design. This creates a valve with a slightly tilting disc and seat. TOVs are often used for highly critical applications. It often has a metal-to-metal seat design.

 

Butterfly valve end connection

Flanged type :This type is the common end for the butterfly valve.
Wafer type  :This type is attached between two flanges using bolts that lock the entire valve body
Lug type :This type has lugs outside of the body. Bolts connect the valve to the pipe system. Commonly with low-pressure ratings, this is usually attached to dead-end services.

 

Butterfly valve actuation

Hand Lever: Is common for small butterfly valves and is capable of being locked into a position of open, partially open, or closed.
Gear: These are designed for slightly larger butterfly valve and utilize a gearbox to increase torque at the expense of decreased speed of opening/closing. Gear operated butterly valves are also self-locking (cannot be back driven) and can be equipped with position indicators.
Electric: Use an electric motor to turn the butterfly valve stem
Pneumatic: Requires compressed air to move a piston or diaphragm to open/close the butterfly valve.
Hydraulic: Requires a hydraulic pressure to move a piston or diaphragm to open/close the butterfly valve.

 

  • Wafer triple eccentric butterfly valve

    Wafer triple eccentric butterfly valve

    • Port size:2″ to 48″,DN50-DN1200
    • Pressure:PN10-100 bar,150LB-900LB
    • Structure:Triple eccentric,metal seated
    • Medium:Water,steam,oil,etc.
    • Temperature :-40 ~ 450℃
    • Body material:Carbon steel,stainless steel,etc.
  • Flanged triple eccentric butterfly valve

    Flanged triple eccentric butterfly valve

    • Port size:2″ to 100″,DN50-DN2400
    • Pressure:PN10-100 bar,150LB-900LB
    • Structure:Triple eccentric,metal seated
    • Medium:Water,steam,oil,etc.
    • Temperature :-40~450℃
    • Body material:Carbon steel,stainless steel,etc.
  • Flanged FEP lined butterfly valve

    Flanged FEP lined butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full FEP lined
    • Medium:Corrosive medium
    • Temperature :-20~150ºC
    • Body material:Carbon Steel, Stainless Steel+FEP lined
  • Wafer FEP lined butterfly valve

    Wafer FEP lined butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full FEP lined
    • Medium:Corrosive medium
    • Temperature :-20~150ºC
    • Body material:Carbon Steel, Stainless Steel+FEP lined
  • Gear operated lug butterfly valve

    Gear operated lug butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Lug style butterfly valve with lever handle

    Lug style butterfly valve with lever handle

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Ductile iron lug type butterfly valve

    Ductile iron lug type butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Ductile iron or other material
  • Lever Cast iron lug butterfly valve

    Lever Cast iron lug butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron or other material
  • Concentric lug type butterfly valve

    Concentric lug type butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Center line lug butterfly valve

    Center line lug butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Lever operated wafer butterfly valve

    Lever operated wafer butterfly valve

    • Port size:DN50-DN200;2''-8''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Centric wafer style butterfly valve

    Centric wafer style butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Stainless steel wafer type butterfly valve

    Stainless steel wafer type butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:CF8 CF3 CF8M CF3M or other stainless steel
  • Resilient seated wafer butterfly valve

    Resilient seated wafer butterfly valve

    • Port size:DN15-DN600;1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • China centerline wafer butterfly valve

    China centerline wafer butterfly valve

    • Port size:DN15-DN600;1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Concentric wafer type butterfly valve

    Concentric wafer type butterfly valve

    • Port size:DN15-DN600;1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Gear operated flanged butterfly valve

    Gear operated flanged butterfly valve

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB according to structure
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Lever handle flanged butterfly valve

    Lever handle flanged butterfly valve

    • Port size:DN40-DN200;1 1/2''-8''
    • Pressure:PN16 ~ 64,150LB ~ 600LB according to structure
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Flanged butterfly valve manufacturer and supplier

    Flanged butterfly valve manufacturer and supplier

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Rubber lined flanged butterfly valve

    Rubber lined flanged butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Soft seated flanged butterfly valve

    Soft seated flanged butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • China flanged butterfly valve factory

    China flanged butterfly valve factory

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Stainless steel flanged butterfly valve

    Stainless steel flanged butterfly valve

    • Port size:DN50-DN2000;2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Stainless steel or others
  • Carbon steel flanged butterfly valve

    Carbon steel flanged butterfly valve

    • Port size:DN50-DN2000;2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Carbon steel or others
  • China double flanged butterfly valve

    China double flanged butterfly valve

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 64,150LB ~ 600LB according to structure
    • Structure:soft seated or metal seated structure
    • Medium:Water,air,etc.
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Concentric double flanged butterfly valve

    Concentric double flanged butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric,rubber lined body
    • Medium:Water,air,etc.
    • Temperature :-20~150ºC (according to rubber material)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Electric actuator actuated butterfly valve

    Electric actuator actuated butterfly valve

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 100,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Electric motor operated butterfly valve

    Electric motor operated butterfly valve

    • Port size:DN40-DN2000;1 1/2''-80''
    • Pressure:PN16 ~ 100,150LB ~ 600LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • China electric actuated butterfly valve

    China electric actuated butterfly valve

    • Port size:DN50-DN2000;2''-80''
    • Pressure:Different structure,different pressure
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Lug style electric butterfly valve

    Lug style electric butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:soft seated or metal seated structure
    • Medium:Water,air,etc.
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Wafer sandwich electric butterfly valve

    Wafer sandwich electric butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:soft seated or metal seated structure
    • Medium:Water,air,etc.
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Double flanged electric butterfly valve

    Double flanged electric butterfly valve

    • Port size:DN50-DN1200;2''-48''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Concentric or eccentric structure
    • Medium:Water,air,etc.
    • Temperature :-20~120ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
  • Lug PFA lined butterfly valve

    Lug PFA lined butterfly valve

    • Port size:DN40-DN600;1 1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PFA lined
    • Medium:Corrosive medium
    • Temperature :-20~200ºC
    • Body material:Carbon Steel, Stainless Steel+PFA lined
  • Wafer PFA lined butterfly valve

    Wafer PFA lined butterfly valve

    • Port size:DN40-DN600;1 1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PTFE lined
    • Medium:Corrosive medium
    • Temperature :-20~200ºC
    • Body material:Carbon Steel, Stainless Steel+PFA lined
  • Flanged PFA lined butterfly valve

    Flanged PFA lined butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PFA lined
    • Medium:Corrosive medium
    • Temperature :-20~200ºC
    • Body material:Carbon Steel, Stainless Steel+PFA lined
  • Lugged end PTFE lined butterfly valve

    Lugged end PTFE lined butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PTFE lined
    • Medium:Corrosive medium
    • Temperature :-20~150ºC
    • Body material:Carbon Steel, Stainless Steel+PTFE lined
  • Wafer type PTFE lined butterfly valve

    Wafer type PTFE lined butterfly valve

    • Port size:DN15-DN600;1/2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PTFE lined
    • Medium:Corrosive medium
    • Temperature :-20~150ºC
    • Body material:Carbon Steel, Stainless Steel+PTFE lined
  • Flanged end PTFE lined butterfly valve

    Flanged end PTFE lined butterfly valve

    • Port size:DN50-DN600;2''-24''
    • Pressure:PN10/16,150LB,JIS5K/10K
    • Structure:Split body, full PTFE lined
    • Medium:Corrosive medium
    • Temperature :-20~150ºC
    • Body material:Carbon Steel, Stainless Steel+PTFE lined
  • Stainless steel pneumatic butterfly valve

    Stainless steel pneumatic butterfly valve

    • Port size:DN40-DN1200;1 1/2''-48''
    • Pressure:PN10 ~ 15,150LB
    • Structure:Concentric or eccentric structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~180ºC(soft seated)-46~450ºC(metal seated)
    • Body material:CF8 CF3 CF8M CF3M or other stainless steel
  • Lug type pneumatic butterfly valve

    Lug type pneumatic butterfly valve

    • Port size:DN40-DN600;1 1/2''-24''
    • Pressure:PN10 ~ 16,150LB
    • Structure:soft seated or metal seated structure
    • Medium:Water,steam,oil,gas
    • Temperature :-20~180ºC(soft seated)-46~450ºC(metal seated)
    • Body material:Cast iron, ductile iron, carbon steel,stainless steel
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