Concentric butterfly valve

Concentric butterfly valve introduction

Concentric butterfly valve is a flow control mechanism that uses a rotary disk to control the flow medium in the system. The disk remains in the passage, but since it is so thin, it gives very little resistance to the flow.
Concentric butterfly valve has many benefits over other types of valves, such as economic construction, which consists of fewer components, making it easier to operate and maintain. The wafer design body and the relatively lightweight reduce its costs and installation costs, equipment, pipe support, labor and set – up time.
This type of concentric butterfly valve consist of the stem which travels along the middle line of the disk in the center of the pipe bore and the seat is inside diameter of the body of the valve. This no offset valve configuration is also known as a resilient-seated valve as it depends on the flexibility of the seat rubber when the flow is closed, for the reliability of the seal. In this type of valve, the disk first interacts with the seat at about 85° for a 90° rotation. Concentric butterfly valve is widely used in low-pressure applications.
Concentric butterfly valve can be widely used in water treatment、fire protection、chemical industry、light industry、papermaking industrial、pharmaceutical、car automatic control system on a remote concentrated or local control.

Concentric butterfly valve technical parameter

● Connection Type: Wafer, Lug, Double Flange
● Material: Cast Iron, Ductile iron, Carbon steel. Stainless Steel and others
● Actuator Type: Manual, Electric (on-off or regulating), Pneumatic (spring return or double acting)
● Operating Pressure: 10-16 bar,150LB
● Size Range: 2″ to 100″
● Suitable Medium: Water, Air, Gas, etc.
 

Concentric butterfly valve classification

• Wafer type ends.
• Lug type ends.
• Double flanged ends.

Concentric butterfly valve work principle

Concentric butterfly valve has a relatively simpler design. The body, seal, disc, and stem are the main parts of the concentric butterfly valve. The traditional butterfly valve has a disk located in the middle of the attached pipe and a stem is connected to the actuator or handle on the outside of the valve. When the valve is in a closed position, the disk is perpendicular to the flow and the seat of the valve is shut. The stem is sealed with an O-ring. When the valve makes a turn of 90 degree with the help of actuator or handle, the disk travels away from the valve seat and is located parallel to the flow. The rotation at an angle less than 90-degrees allows the flow to be either throttled or proportional.