Butterfly valves are used in both heavy and light uses. Butterfly valves are flow regulating, pivoted disc valves. the circular disc or plate, having the same radial dimensions as the pipe is pivoted exactly in the centre of the pipe, perpendicular to the direction of the flow.

 

Construction:

Butterfly valves belong to a family of valves known as " quarter turn valves" because of this type valve fully close or open with only a quarter of a turn.

the disc if the butterfly valve is mounted perpenticular to the flow stream, the disc turns to open/block the flow stream when the actuator turns, Though the valve gives an unrestricted flow of fluid, it induces a pressure drop in the flow as the disc is always present within the flow.

When the valve is closed the disc turns so that the disc block the flow, When the valve is open, the disc turns quarter turn, so that to allow unrestricted flow. the valve may also open incrementally to regulate flow.

the discs in butterfly valves can have different shapes. Different shape discs can improve throttling characteristics and provide a tight shut-off

Different position of dics is shown below.

There are three popular types of butterfly valve based on the actuators used:

Manual gear reducer: Manually operated by hand wheel

Electric motor: Electrical motor enables the roatation, widely used type in automation.

Pneumatic cyclinder: pneumatic system enable the roation of the actuator.

Advantages:

Low pressure drop

Small and light weight

Disadvantages:

High leakage

Need high actuation force so limited to low pressure.

Series VFS Butterfly Valves (14 matching Items)

 

Model:V1FS400SN V1FS350SN V1FS300SN V1FS300SN V1FS250SN V1FS200SN V1FS150SN V1FS100SN V1FS400GBN V1FS350GBN V1FS300GBN V1FS250GBN V1FS200GBN V1FS150GBN V1FS100GBN V2FS400SN V2FS350SN V2FS300SN V2FS300SN V2FS250SN V2FS200SN V2FS150SN V2FS100SN V2FS400GBN V2FS350GBN V2FS300GBN V2FS250GBN V2FS200GBN V2FS150GBN V2FS100GBN

Model	100-400	Working Pressure	0.4-0.7Mpa MAX1.0Mpa
Drive Mode	Pneumatic,electric,manual,worm gear	Temperature	-20℃-+80℃
Medium	Cement, dust etc powder medium	Body	Die casting aluminum alloy
Vale plate	Aluminum, Polyurethane(plastic), cast iron, Stainless steel
Valve Seat	Wear-resistant rubber	Vale stem	Stainless steel