Didtek CF8M Full Bore Flange Pneumatic Ball Valve

Product Overview

The CF8M flanged pneumatic ball valve is an industrial valve specially designed for automatic control, corrosive working conditions and medium and high pressure environments. It can quickly and precisely open or cut off corrosive fluids in pipelines by receiving pneumatic signals.

Didtek CF8M Full Bore Flange Pneumatic Ball Valve

Analysis of Core Concepts

To understand this product, we can break down its name into three parts:

CF8M - Valve body material

This is the stainless steel casting grade in the American ASTM standard, equivalent to CF8M in the Chinese national standard. Its forgings correspond to 316 stainless steel.

Core features: Due to the presence of molybdenum (Mo), it has excellent corrosion resistance, especially in resisting chloride pitting and crevice corrosion, which is superior to ordinary 304 stainless steel. It can withstand a variety of acid, alkali and salt solutions very well.

Applicable medium: It is highly suitable for handling corrosive media such as phosphoric acid, acetic acid, nitric acid, alkaline solutions, seawater, and various chemical raw materials.

Flange - connection method

It refers to the valve with flange plates at both ends, which are connected to the flanges on the pipeline system through bolts.

Advantages: Firm connection, reliable sealing, strong pressure-bearing capacity, easy to install, disassemble and maintain. It is one of the most commonly used connection forms in industrial pipelines.

Pneumatic ball Valve - Drive Mode and Structure

Ball valve: It refers to a valve whose opening and closing part is a ball, which can be fully opened or fully closed by rotating 90 degrees.

Pneumatic: It refers to the use of compressed air as the power source to drive a pneumatic actuator (commonly known as a "pneumatic head") to open and close the ball valve.

Advantages: It achieves rapid opening and closing (usually within just a few seconds) and remote automated control, making it an ideal choice for automated production lines and process control.

Overall Product Overview

The CF8M flanged pneumatic ball valve is an industrial valve specially designed for automatic control, corrosive working conditions and medium and high pressure environments. It can quickly and precisely open or cut off corrosive fluids in pipelines by receiving pneumatic signals.

Basic working principle

Compressed air (typically 0.4 to 0.8MPa) enters the pneumatic actuator, pushing the internal piston or rack and pinion structure to generate torque, which drives the valve stem and ball to rotate 90 degrees. When the through hole of the sphere is parallel to the pipe, the valve opens and the medium flows through. When the through hole of the sphere is perpendicular to the pipe, the valve closes and cuts off the medium.

Main Features and Advantages

Outstanding corrosion resistance: The CF8M (316 stainless steel) material makes it the preferred choice for corrosive environments such as chemical, petrochemical, and Marine industries.

Fast automated response: Pneumatic drive switches are fast and highly suitable for applications that require frequent opening and closing or emergency shut-off.

Outstanding sealing performance: The valve seat is usually made of high-performance polymers such as PTFE (polytetrafluoroethylene) and PPL, which have good sealing performance and low friction coefficient.

Smooth fluid channel: When designed with Full Port, the flow resistance is extremely small, almost zero, and has little impact on the pressure loss of the pipeline.

High reliability and security

Fireproof structure: In the event of a fire, after the non-metallic sealing parts are burned out, the ball valve can form a secondary seal through metal contact to prevent a large amount of medium leakage (conforming to API 607/API 6FA standards).

Anti-static design: Ensure that the static electricity between the ball and the valve stem and valve body can be discharged, avoiding the accumulation of static electricity that may cause sparks.

Valve stem anti-flying design: Even in the event of abnormal pressure in the valve chamber or damaged valve stem seal, the valve stem will not be pushed out by the medium pressure, ensuring the safety of the operator.

Easy to integrate and install

Flange connection standards are universal (such as GB/T, HG/T, ANSI, DIN, JIS).

The actuator complies with the ISO 5211 international standard and is designed on a high platform. It can be conveniently installed with pneumatic or electric actuators of different brands and various accessories can be attached.

Typical Application Industries

Chemical engineering and petrochemicals: Transportation and cut-off of various corrosive media such as acids, alkalis, and solvents.

Pharmaceuticals and bioengineering: Process piping with requirements for hygiene and corrosion resistance.

Water treatment and environmental protection: Dosing and fluid control in sewage treatment and seawater desalination systems.

Food and beverages: Processes that meet high hygiene standards and may contain corrosive components (such as acids and cleaning agents).

Metallurgy and power: Boiler feed water, cooling systems, flue gas desulfurization, etc.

Ships and Marine Engineering: Various systems resistant to seawater corrosion.

Commonly Used Attachments

To achieve more complex functions, the following accessories are usually equipped for pneumatic actuators:

Solenoid valve: Controls the on and off of compressed air to achieve remote control by electrical signals.

Limit switch: It feeds back the open or closed position signal of the valve to the central control room.

Air source treatment three-piece set: filter compressed air, regulate pressure, and lubricate the air with oil.

Handwheel mechanism: In case of air source failure, manual emergency operation can be carried out.