Author: Site Editor Publish Time: 2019-04-24 Origin: Site
The structural characteristics of the high temperature and high-pressure hard seal ball valve is difference from soft seated ball valve, following features we could figure out the differences and help know more about the hard seal industrial ball valve.
lWhat is the material of hard sealing ball valve body?
lWhat is the end connection form of the hard seal ball valve?
lWhat is the structural characteristics of hard-sealed ball valves?
Hard seal ball valve, manual cast steel hard seal ball valve body surface adopts advanced spraying technology, through the treatment of various working conditions, the highest hardness can reach HRC78. The seat sealing surface is treated to a maximum hardness of HRC72.
The ball and the valve seat are paired and ground, and all sealing areas of the entire sealing surface of the ball valve are precisely ground. Suitable for high temperature and high pressure water, steam, petroleum, coal, fiber, thick and corrosive media, and media with particles. The metal sealing ball valve has a floating ball and a fixed ball. The two metal seat rings are in contact with the spherical surface, and the valve seat ring and the spherical surface are sealed by a uniform spring load acting on the seat ring.
Due to the spring load, the auxiliary seal expands to achieve the seal between the valve body and the valve seat. The spring load is sufficient to provide a reliable seal between the valve seat and the ball. Under low pressure conditions, it can be designed between the seat sealing surface and the ball. There is a sealing grease injection system.
Body material is made of stainless steel forging, it has excellent oxidation resistance at high temperature, high-temperature strength limit and corrosion resistance under long-term high temperature, and has a long service life. 15CrMo, 1Cr5Mo forged steel can also be selected according to the specific conditions used.
The elastic components made of special materials, the selection of suitable elastic component materials and suitable heat treatment techniques and methods to ensure the consistency and stability of the elastic components under high temperature and high-pressure conditions, is to ensure the long-term stable operation of high
special spherical materials, processing and heat treatment, because high temperature and high-pressure ball valve and ordinary ball valve have different requirements and characteristics, the selection of its key parts - spherical material, processing methods, and processing technology is very important, according to the site The specific working conditions use different materials and processing and heat treatment methods to meet different process requirements.
The material of the ball valve sealing pair (ie, the seat sealing surface and the ball sealing surface) is paired with a metal-to-metal ball valve. The structure of the ball valve is divided into a floating ball type and a fixed ball type, and the connection form is a flange connection, a welded connection and a screw connection.
The valve body connection form is divided into flange end and welded end, especially the nominal pressure ANSI1600# or above, or high temperature, high-pressure occasions recommended welding end.
Ensure the proper hardness difference between the ball and the valve seat (generally HRC10~20, which can be achieved by different heat treatment or different alloying methods), and the appropriate seat pressing force and its key. It is necessary to ensure the sealing between the ball and the valve seat and to ensure the proper torque. Only by using reasonable processing methods, the processing technology and the heat treatment process can meet the technical requirements.
According to the user's specific requirements and process conditions, the ball and valve seat can be hardened by heat treatment hardening, surfacing welding, spray welding, stellite alloy, nickel-based alloy and other methods.
Special elastic compensation structure (spring of different forms) is adopted to ensure reliable sealing of the valve. The high temperature and high-pressure hard seal ball valve have much higher requirements on the elastic compensation structure than the ordinary ball valve, so it is important to use the elastic compensation of the appropriate structure.
Temperature and high-pressure ball valves. Its key technical difficulties.The sphere adopts a solid overall ball structure to reduce the slight deformation of the sphere caused by temperature changes and pressure changes, thereby ensuring good sealing performance under high temperature and high-pressure conditions.
According to the working temperature of the medium, different heat dissipation lengths are used to ensure reliable operation of the actuator.Adopt strict inspection and testing methods to ensure the quality of valve products.
The above is a detailed description of the structural characteristics of the high temperature and high-pressure hard seal ball valve.Industrial ball valves are widely used in petroleum refining, long-distance pipelines, chemical, paper, water conservancy, electric power, municipal, steel and other industries. It is mainly used in the pipeline to cut, distribute and change the flow direction of the medium.
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