Fluorine Lined Butterfly Valve

Product Overview

Fluorine lined butterfly valves produced by our company use a disc that rotates together with the stem as the opening and closing element, allowing opening, closing, and flow adjustment. In addition to shut-off capability, sealing performance is very important and is highly valued by users.

The valve is compact and lightweight. Compared with various gate valves, its weight is reduced by about 30%–50%. The butterfly plate rotates 90° to complete opening and closing. The required torque is small because the forces on both sides of the disc are balanced and act in opposite directions.

Product Features

• The centerline butterfly valve features bidirectional sealing and allows pressure and flow regulation, with the disc and seat sharing the same center.

• Class 4 load flexible sealing ensures zero leakage both internally and externally.

• A specially designed transition curve between the shaft and disc provides reasonable interference.

• The shaft surface adopts a circular design combined with a strong washer and flexible rubber.

• The radial axis uses a combination of an O-type structure and metal washer.

• The seat is installed in the slot of the flexible valve body.

• It adopts an adjustable elastic positioning structure, offering precise positioning with a simple design.

Executive Standard

Main Parts Material Specifications

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.

Basic Model

Executive Standard

Main Parts Material Specifications

Main Dimension

PN0.6 MPa

PN1.0 MPa

PN1.6 MPa

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)

Basic Model

Main Dimensions

PN0.6 (MPa)

PN1.0 (MPa)

PN1.6 (MPa)

Manufacturing Process

Applications

The fluorine lined butterfly valve, with its outstanding features such as excellent corrosion resistance, wear resistance, good sealing performance and adaptability to complex working conditions, has been widely applied in various industries including chemical engineering, petroleum and natural gas, power, new energy, biomedicine, information technology, food and beverage, and environmental protection. It can achieve stable, clean and efficient fluid control in complex media environments such as strong acids and alkalis, organic solvents, high-purity media, sewage and waste gas. With the upgrading of the chemical industry, the expansion of new energy, the strengthening of environmental protection governance and the development of high-end manufacturing, its market demand continues to grow and the market size shows a steadily rising trend.

These valves are widely used in:

Factory Environment

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