Ball valve stem

The materials of ball valve stems mainly include:

Carbon steel: When used for water and steam media with low pressure and medium temperature not exceeding 300℃, A5 ordinary carbon steel is generally used. When used for water and steam media with medium pressure and medium temperature not exceeding 450℃, 35 high-quality carbon steel6 is generally used.

Alloy steel: When used for medium and high pressure, water, steam, oil and other media with medium temperature not exceeding 450℃, 40Cr (chrome steel) is generally used. When used for water, steam and other media with high pressure and medium temperature not exceeding 540℃, 38CrMoALA nitriding steel6 can be used.

17-4PH stainless steel: It has sufficient strength. When the torque is increased to twice the normal value, the valve stem will not be twisted off. This material must also ensure sufficient strength and impact toughness at the specified temperature, and have certain corrosion resistance and abrasion resistance5.

The role of the ball valve stem
The ball valve is a common valve type, widely used in various piping systems. The ball valve stem plays a vital role in the ball valve, as follows:

Connection and transmission:The valve stem connects the handle (or actuator) and the ball of the ball valve. When the handle or actuator is operated, the valve stem transmits the rotational motion to the ball, causing the ball to rotate in the valve body, thereby opening and closing the valve.

Sealing:The valve stem also plays a sealing role. When the ball valve is closed, the valve stem ensures the seal between the ball and the valve seat by pressing the valve seat sealing ring to prevent medium leakage. The sealing performance of the valve stem is crucial to the overall sealing of the ball valve.

Support:

The valve stem also plays the role of supporting the ball, ensuring that the ball remains stable during rotation,

Avoid the ball from being offset due to vibration or external force, which affects the sealing performance and service life of the valve.
Operating torque transmission:

The valve stem transmits the operating torque to the ball, allowing the ball to open and close quickly under a smaller torque. This makes the ball valve more labor-saving and efficient during operation.

Preventing medium leakage:The valve stem is usually equipped with devices such as packing seals or bellows seals to prevent the medium from leaking through the gap between the valve stem and the valve body. These sealing devices cooperate with the valve stem to ensure the sealing performance of the ball valve under high pressure and high temperature conditions.
In summary, the ball valve stem plays a role in connection, transmission, sealing, support and protection in the ball valve.

Product advantages

1. Corrosion resistance: The product is made of 420 stainless steel (the material can be customized according to customer requirements). Stainless steel has strong corrosion resistance and can enhance the service life of users;
2. Impact resistance: The raw materials and finished products of the product are tempered to enhance the hardness of the product, so that the product has higher hardness and toughness;
3. Good size and shape tolerance guarantee: All valve accessories are processed by CNC processing equipment, and the product size and shape tolerance have more complete inspection methods;