the spherical valve industry valve manufacturers design standards regulating elements and a lot of butterfly valve regulating elements: 1/4 rotation, rotation movement of the actuator and the lower ( Wipe the) Stuffing box packing. Ball valve has a basic form, such as 4. 4. Mentioned in section 1: all hatch ball valve and ball valve features. All hatch net body assembly adjustment features is to use one of two methods to support ball sphere. The first method is floating seal structure ( Figure 4. 30) , similar to most of the manual ball valve structure, that is, two full contact yan in population and exports hatch, sphere contact with the two seal on the hatch, noodles don't direct contact with the valve body.

a sphere with a sliding fit or other similar institutions and shaft connection, these institutions must be particularly abundant solid to avoid mechanical hysteresis, especially by the continuous friction Angle of the structure. The basic advantage of this structure is not wither to use blind side chamber air shaft jing to prop up the sphere. Its advantage is that the ball must have a very tight tolerance matching to ensure sealed ends a long-term contact. Because seal must seal logistics and support a sphere, so the industrial valve manufacturer should be designed to be suitable for accurate and heavy load conditions. Because of this structure with the sealed bearing surface, it is often used in medium voltage and temperature conditions.

characterization ball valve without the use of spherical ball, and replace it with hollow spherical segment. When opened entirely, rotating fan form and leave the logistics, industrial Industrial Valves manufacturer to make appropriate smooth flow through the valve body, although the body shape and characteristics of the sphere geometry will produce small pressure drop and may produce some turbulence. When the valve movement to the middle of throttle position, characterization sphere in flow channel. Flow characteristics is a v-notch or parabolic curve for the flow of the required for each position. When the valve is to continue the 1/4 rotation movement, this gap or curve became smaller, until the entire surface of the ball is exposed to the logistics, and achieve fully closed position. V-notch has a natural linear flow to sex, but when installing a Marine valve, it can become close to equal percentage flow characteristics. Parabolic flow gap can improve to meet the requirements.

the size of the spherical valve typical 1 ~ 12 (in DW25 to DW300) , the pressure level can reach ANSI600 ( PN100) 。

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