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Butterfly valve

Double Offset Butterfly Valve

  1. Body material: Carbon steel, Stainless steel, Alloy steel etc
  2.  Size range(s):3″～48″
  3. Type: wafer, Lug, Flange, Butt Weld
  4. Pressure rating: Class150 – Class600
  5. operation: Lever, gearbox, Electric-actuator, Pneumatic- actuator, etc.

Triple Eccentric Butterfly Valve

  1. Body material: Carbon steel, Stainless steel, Alloy steel,ect
  2.  Size range(s):3″～48″
  3. Type: wafer, Lug, Flange, Butt Weld
  4. Pressure rating: Class150 – Class600

  5. operation: Lever, gearbox, Electric-actuator, Pneumatic- actuator, etc.

Cryogenic Butterfly Valve

  1. Body material: Carbon steel, Stainless steel
  2.  Size range(s):3″～48″
  3. Type: wafer, Lug, Flange, Butt Weld
  4. Pressure rating: Class150 – Class300

  5. operation: gearbox, Electric-actuator, Pneumatic- actuator, etc.

Introduction To Butterfly Valve

The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the opening and closing or adjustment of the valve is called the butterfly valve. The butterfly valve is usually less than 90 degrees from full opening to full closing. The butterfly valve and the butterfly rod itself have no self-locking force. In order to position the butterfly plate, a worm gear reducer should be installed on the valve rod. Using worm gear reducer can not only make the butterfly plate have self-locking ability, stop the butterfly plate at any position, but also improve the operating performance of the valve.

The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the opening and closing or adjustment of the valve is called the butterfly valve. The butterfly valve is usually less than 90 degrees from full opening to full closing. The butterfly valve and the butterfly rod itself have no self-locking force. In order to position the butterfly plate, a worm gear reducer should be installed on the valve rod. Using worm gear reducer can not only make the butterfly plate have self-locking ability, stop the butterfly plate at any position, but also improve the operating performance of the valve.

Double Eccentric Structure

1st Offset: The Centerline of the stem and seat deviate from each other for a certain distance to ensure the integrity of the sealing surface

2nd Offset: The Centerline of the stem and body deviate from each other for a certain distance to reduce the friction between the sealing components when opening and closing the valve 

At the initial point of disc opening, the offset disc produces a cam–like action, pulling the disc from the seat. This cam–like action reduces seat wear and eliminates seat deformation when the disc is in the open position. When open, the disc does not contact the seat,therefore seat service life is extended and operating torques are reduced. As the valve closes, the cam–like action converts the rotary motion of the disc to a linear type motion to effectively push the disc onto the seat.The wiping action of the disc against the seat prevents undesirable material build-up from slurries or suspended solids.

Triple Eccentric Structure

Eccentric 1: The Centerline of the stem and seat deviate from each other for a certain distance to ensure the integrity of the sealing surface

Eccentric 2: The Centerline of the stem and body deviate from each other for a certain distance to reduce the friction between the sealing

Eccentric 3: The Centerline of the valve body and conical seat sealing face deviate from each other for a certain angle to ensure the sealing ring of the disc can be separated or touched with seat rapidly so that friction and squeeze will not exist between the sealing components

A triple eccentric butterfly valve adds an angle eccentricity on the basis of a double eccentric butterfly valve. The main function of this angle eccentricity is to make any point between the sealing ring and the valve seat quickly disengage or contact during the opening or closing action of the valve, so as to achieve the real “Non-friction” between the sealing pairs, which greatly extends the service life of the valve

Selection principle of butterfly valve

  1. Because the pressure loss of butterfly valve is relatively large compared with that of gate valve and ball valve, it is suitable for pipeline systems with lax requirements on pressure loss
  2. Since the butterfly valve can be used for flow regulation, it is suitable for selection in the pipeline requiring flow regulation
  3. Due to the limitations of the structure and sealing materials of the butterfly valve, it is not suitable for high-temperature and high-pressure pipeline systems. Generally, the working temperature is below 300 degrees and the nominal pressure is below PN40
  4. Because the structural length of a butterfly valve is relatively short, and it can be made into a large diameter, a butterfly valve should be selected for occasions where the structural length is required to be short or for large diameter valves (above DN1000)
  5. Since the butterfly valve can be opened or closed only by rotating 90 degrees, it is appropriate to choose the butterfly valve in the field with fast opening and closing requirements

industrial valve more than 20 years experience since 1999

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Ball Valve

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Check Valve

Butterfly Valve

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