Fluorine Lined Butterfly Valve

1. Flanged Fluorine Lined Butterfly Valve

Technique Standard

Basic Model

Form of Main Parts Materials

Main Outline and Connecting Flange Size

ZTD641F(F4/F46)-PN10(1.0MPa)

ZTD641F(F4/F46)-PN16(1.6MPa)

Fluorine Lined Butterfly Valve Series

(1).The basic types include ZTD671F4 and ZTD671F46 (center-line) fully lined wafer-type butterfly valves. The valve body adopts a two-piece split structure, and the valve seat is integrally lined with the valve body. During operation, only the fully lined plastic seat and the butterfly disc come into contact with the medium. The valve can withstand corrosion from almost all media (except molten metal and elemental fluorine).

In the D71F46 type, the valve stem and butterfly disc (forged) are integrated as one piece, and the surface is fully coated with FEP. The inner surface of the valve body flow channel is smooth, resulting in low fluid resistance, high Cv value, strong flow capacity, and moderate operating torque. A four-stage sealing structure is adopted, and a temperature-resistant and aging-resistant silicone rubber elastic seat is arranged outside the sealing surface, achieving zero leakage of the medium.

(2).Based on the above models, the ZTD641F4 and ZTD641F46 flange-connection butterfly valves are developed. The valve body is fully lined, while the butterfly disc is made of stainless steel with a semi-lined structure.

Structural Features

(1).The center-line butterfly valve design ensures that the butterfly disc and seat are concentric (centered) within a 360° circumference, providing bi-directional sealing performance. Pressure and flow rate can be adjusted freely.

(2).A four-stage loaded elastic sealing structure ensures absolute zero leakage both internally and externally: A. A specially designed transition curve between the shaft head and the circumference of the butterfly disc ensures smooth transition with the valve seat. B. The shaft end face adopts a combination of elastic O-ring, rigid steel washer at the shaft shoulder, and elastic rubber gasket. C. The radial sealing of the shaft adopts a combination of O-ring and metal gasket. D. The valve seat is embedded in the elastic groove of the valve body.

(3).An adjustable elastic pin positioning structure is adopted, ensuring accurate positioning and a simple structure.

2. Wafer Fluorine Lined Butterfly Valve

The wafer Butterfly Valves (center line-type):

Design and manufacture in accordance with the basic form of China's national standards, which means that disc shaft coincident with body or seat center.

Butterfly valve is with the stem together with the rotation of the butterfly plate as the opening and closing parts, to achieve the valve open, close and adjust.

Butterfly valve is a kind of valve to open, close, and adjust by on–off switch. And the on–off switch is composed with the stem and rotating disc.

Except from truncation and interception in the pipeline, butterfly valve has been the sealing performance in recent years. In addition, the butterfly valve has the advantages of small volume, light weight, simple structure, etc.

Compared with the same parameters gate valve, when the flat height is up to 30–50%, the butterfly plate can rotate 90° and can open or close valve. The force is approximately equal, the torque is opposite, so the opening and closing force distance is small.

a. ZTD671F46 – The lining type, which means lining body, lining butterfly plate, butterfly plate and butterfly plate shaft are integrated.

b. ZTD671F4 – The lining type, which means lining body, lining butterfly plate, butterfly plate and butterfly plate shaft are assembled.

c. ZTD671F/P – The half lining type, which means lining body, stainless steel of butterfly plate (not lined), butterfly plate and butterfly plate are assembled.

Technique Standard

Reference Table of Butterfly Valve Driving Torque

Form of Main Parts Materials

Main Outline and Connecting Flange Size

ZTD671F(F4/F46)-PN6(0.6MPa)

ZTD671F(F4/F46)-PN10(1.0MPa)

ZTD671F(F4/F46)-PN16(1.6MPa)