1.Modeling design According to the current casting process technology, it is decided to adopt the precision core assembly molding of cold box with high dimensional accuracy and good surface quality, and the core is made manually without the need for sand box fixation. According to the structure of the...
The casting process design of the flange ball valve was simulated by AnyCasting. The solidification sequence of the flange ball valve casting was obtained through simulation as shown in Figure 1. The solidification sequence of the flange ball valve casting was analyzed as follows: top, runner → middle of...
With the improvement of the transportation requirements for water, liquefied petroleum gas, natural gas and other media, the performance requirements for ball valves are becoming higher and higher. In order to improve the performance of ball valves, a set of casting process plan with higher performance must be designed....
As the ball valve can be opened and closed only by turning the ball 1 / 4 circle, it belongs to the partial rotary angular stroke valve, so the pneumatic actuator used in it also selects the partial rotary type. At present, the commonly used partial rotary pneumatic actuator...
Ball valve has the advantages of small flow resistance, quick opening and closing and easy pigging, which makes it widely used in oil, natural gas and other industries. When the ball valve is closed, it is completely sealed by the medium force without the forced sealing force exerted by...
The influencing factors of ball valve torque mainly include pressure, temperature, medium type, property and quantity of suspended substance in fluid and operation frequency, as well as the structure and processing quality of ball valve. Therefore, when selecting the pneumatic actuator of the ball valve, the maximum output torque...
The built-in fork type pneumatic actuator (Fig. 1) replaces the gear rack of the traditional rack pneumatic actuator with the fork assembly, which is also divided into double action and single action. Compared with the rack and pinion type, the cylinder diameter of the built-in fork type pneumatic actuator...
The external fork type pneumatic actuator is also divided into double acting type and single acting type, which is composed of two split cylinders and has the characteristics of large output torque. The structure of double acting external fork type pneumatic actuator is shown in Figure 1. When the...
Rack and pinion actuator is the most commonly used pneumatic actuator. The middle of the cylinder is connected with the rack and pinion. Rack and pinion type can be divided into double acting type and single acting type. At present, the inner diameter of the rack and pinion actuator...
The structure and operation characteristics of the ball valve determine that the opening torque of the ball valve is unbalanced, and its opening torque decreases with the increase of the opening degree, which has its special torque characteristic curve. The torque of the ball valve is the maximum at...