Didtek CF3 Stainless Steel Trunnion Mounted Ball Valve

Product Overview

The CF3 stainless steel ear shaft ball valve is a type of ball valve that uses CF3 (304L) stainless steel to cast the main pressure-bearing components and adopts an ear shaft type fixed ball design. It combines excellent corrosion resistance with high reliability and low-torque operation under high-pressure and large-diameter conditions, making it one of the preferred valve types in industries such as chemical engineering, petrochemicals, and LNG.

Didtek CF3 Stainless Steel Trunnion Mounted Ball Valve

Detailed explanation of key features

Material: CF3 stainless steel

What is it? CF3 is a casting stainless steel grade in the American ASTM standard, and its composition is equivalent to the common AISI 304L stainless steel.

Low-carbon advantage: Its core advantage lies in the low carbon content (≤0.03%). This endows it with excellent resistance to intergranular corrosion.

Application scenarios: It is particularly suitable for components after welding processing or environments that may be exposed to corrosive media, effectively preventing corrosion caused by the precipitation of chromium carbide at the grain boundaries.

General corrosion resistance: It has excellent corrosion resistance to the atmosphere, fresh water, and a variety of organic and inorganic chemicals.

Design: Ear shaft type fixed ball

Fixed ball structure: The valve ball is fixed on the valve body through two short shafts (ear shafts) at the top and bottom, and is supported by bearings. A sphere does not shift under pressure.

Low operating torque: The medium pressure will not push the ball towards the valve seat, so the torque required to open and close the valve is much less than that of a floating ball valve, making the operation of large-diameter and high-pressure pipelines more convenient.

Outstanding sealing performance: Adopting a "floating valve seat" design. Under the combined action of the spring preload and the medium pressure, the valve seat is pushed towards the ball, forming a bidirectional seal. Reliable sealing effect can be guaranteed both under high pressure and low pressure conditions.

High pressure resistance: This robust design enables it to withstand higher pipeline pressures, making it an ideal choice for high-pressure applications.

Function: Dual truncation and discharge

Most ear-shaft ball valves are designed for DBB function. When the valve is in the closed state, the two valve seats upstream and downstream can independently cut off the medium. Through the relief valve on the valve body, the accumulated medium between the two valve seats can be discharged, which is used to check the upstream sealing or prevent overpressure in the valve cavity.

Summary of main advantages

Outstanding corrosion resistance: Thanks to CF3 (304L) stainless steel material, it is suitable for corrosive environments.

Outstanding welding performance: The low-carbon composition makes it less prone to intergranular corrosion after welding, facilitating on-site installation and maintenance.

High-pressure capability: The ear shaft design makes it a benchmark for high-pressure and large-diameter applications.

Low operating torque: Facilitates operation using manual levers, gearboxes or actuators.

High sealing performance and long service life: The carefully designed valve seat system and robust structure ensure long-term sealing reliability and service life.

Easy maintenance: Many designs (such as top-mounted) support online maintenance without the need to remove the valve from the pipeline.

Typical application fields

Oil and gas: Long-distance pipelines, refineries, platforms.

Chemical Engineering and Petrochemicals: Transportation of various corrosive chemical media.

Low-temperature applications of liquefied natural gas (usually combined with extended valve covers).

Electric power industry: Power plant process systems.

Water and sewage treatment: Environments containing corrosive media such as chlorides.

Papermaking, food and pharmaceuticals: Applications requiring high hygiene standards or corrosion resistance.

Common designs and standards

Structural form: It can be side-mounted or top-mounted.

Drive mode: manual (lever, gear), pneumatic, electric, hydraulic.

Compliance with standards: Generally, the design and manufacture will comply with international authoritative standards such as API 6D (pipeline valves) or API 608 (flanged wafer connection ball valves).

Design specification: