Marine ball valve's main drawback is that: although the ball valve of the straight line type to provide smaller pressure drop through the logistics, but in ball valve throttle when a significant change in geometry, Marine valve with low pressure difference and high pressure drop and increase the chance to produce cavitation, despite the ball straight through flow type produces minimal pressure drop. Holes may be produced if the operation condition, can use a larger size of the net have higher differential, and prevent the surface with smaller size and a big C, the value of the valves produced by high pressure drop. Using larger ball valve means for working condition of throttling, fujian door the best part of the trip has not been used, and only use the schedule part of the closest to the closed position.

today USES two Marine valve basic structure is: all hatch ball valve and ball Industrial Valves features. Open - with manual operation Similar partition ball Industrial Valves closed, all hatch ball valve using spherical sphere as regulating elements, sphere with pipe diameter of the same boring as characteristics ( Figure 4. 30) 。 When all open all hatch ball valve, logistics to continue unimpeded through the hole, so logistics is not good at regulating elements or the core and small pressure drop ( If there is one) And tiny craft Zi flow. Although the open - Closing operation is the selection of the best, but all hatch rarely used for pure throttling valve working condition, because of the spherical bore Angle edge will produce noise, hole, wear and increase the pressure drop.

although all hatch Marine valves - often used to open Close operation, but it has also been used to need to adopt clean pigs or lever to clean up the pipeline internal clean place ( Requires the use of a straight line through and no regulating elements in logistics flow Industrial Valves) 。 Because of the limitation of the whole hatch sphere structure, can't design flow characteristics on the sphere. Industrial valves processing cast outside of the orifice shape is difficult and expensive. All hatch the valve's inherent flow characteristics close to equal percentage flow characteristics, flow characteristics and any changes, must be completed by the locator CAM.

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