Stainless steel wafer butterfly valve

Overview

Stainless steel wafer butterfly valves are commonly used control devices in industrial pipeline systems and are usually used to regulate and cut off the flow of fluids. Commonly seen are stainless steel three-piece butterfly valves, which have various characteristics and different classification methods and can meet the usage requirements of different scenarios.

Advantages and disadvantages

Advantages

• Operating characteristics: It is convenient, rapid and labor – saving to open and close. It has small fluid resistance and can be operated frequently, which can improve work efficiency and reduce energy consumption.

• Structural characteristics: Simple structure, small size, light weight, easy to install, disassemble and maintain, saving space and cost.

• Medium transportation: It can transport mud, and the liquid accumulated at the pipe opening is minimal. It is suitable for the transportation of some media containing solid particles or viscous media.

• Sealing performance: It can achieve good sealing under low pressure to ensure the normal operation of the pipeline system.

• Regulation performance: It has good regulation performance and can precisely control the fluid flow according to actual needs.

Disadvantages; Drawbacks; Shortcomings; Defects

• Limited scope of use: The applicable pressure and working temperature ranges are relatively small, and it is not suitable for extreme working conditions with high pressure and high temperature.

• Sealing performance limitation: Compared with some special valves, the sealing performance is relatively poor, and it is not very suitable for applications with extremely high sealing requirements.

Classification method

According to the structural form

It can be divided into different types such as offset plate type, vertical plate type, inclined plate type and lever type to meet different fluid control requirements and installation environments.

According to the sealing form

• Soft-sealing type: Generally, a rubber ring is used for sealing. It has a good sealing effect and is suitable for low-pressure and normal-temperature applications.

• Hard-sealed type: Usually, it uses a metal ring for sealing, can withstand relatively high pressure and temperature, and is suitable for relatively harsh working conditions.

According to the connection type

There are connection methods such as flange connection and wafer connection, which facilitate the connection with different pipeline systems.

According to the transmission mode

It can be divided into several types, such as manual, gear – driven, pneumatic, hydraulic and electric. Users can choose the appropriate transmission method according to actual needs.

Common models and specifications

Common stainless steel three-piece butterfly valves include models such as D61F. Most of them are made of 304 stainless steel. The nominal diameters are available in various specifications such as 45, 51, 108, 63, 76, 89, and 57 to meet the size requirements of different pipeline systems.

Application fields

It is mainly used to control the on – off of liquids and materials at pipe connections. In hygienic industries such as beverage machinery, food machinery, and dairy machinery, it is also widely used in fields like water supply, beer, fruit juice, pharmaceutical, and bio – engineering.

Technical parameters

Gasket material

The materials of the gaskets include NBR, VMQ (silicone rubber), FPM (fluororubber), etc. They all comply with the FDA 177.2600 standard, ensuring safe use in the sanitary-grade industry.

Connection method

There are various connection methods, including welding, clamp, thread, single-welding single-thread, flange type, DIN, SMS, RJT, IDF, 3A, etc., which can be selected according to specific installation requirements.

Controller type

There are various types of handles, such as two-position, three-position, and four-position lever handles. Most of them are made of stainless steel, which facilitates users to operate and control the opening and closing positions of valves.

Actuator type

Actuators include stainless steel pneumatic actuators, horizontal pneumatic actuators, electric actuators, etc., which can realize the automatic operation of valves.

Intelligent valve positioner

The intelligent valve positioner supports current signals of 4 – 20mA (0 – 20mA) and voltage signals of 0 – 5V. The bus protocol is DEVICENET, and it can precisely control the opening of the valve.

Pressure and temperature range

The maximum pressure of the welded butterfly valve is 10 BAR, and the minimum pressure is 0.2 BAR. The working temperature range is from -10°C to +120°C, and it can work stably within this range.

Working principle

• Operation mode: It can be automatically operated via the actuator or manually operated using the handle.

• Joystick control: The joystick can control the opening and closing positions of the valve and also adjust the valve to other intermediate positions to meet different flow control requirements.

• Actuator transmission: The actuator converts the axial movement of the piston into a 90 – degree rotational movement and transmits it to the butterfly valve, thereby realizing the opening and closing of the valve.