for process automation of the system, and used on throttle valve actuator and - in the manual Close the Industrial Valves with actuator system has been significantly increased. Usually, determine the actuator size is a complex science, involving many factors and must take an examination of actuators and valve matched correctly. For the valve opening and closing force and/or adjustment process, appropriately selects the executing agency and determine size is key.

some users equates the body size and actuator size. For example, is a false assumption 3 valves forever in a certain size of actuator, its standard of yoke connection shaft connection and valve actuator. If all the process operating conditions and cabinet door structure is the same, it is possible. However in the stress process. Pressure drop, temperature and parking demand is very big, valves with the movement ( A straight line and rotation) , packing friction, balance ( Imbalance of pressure balance) Such changes. Because T art all delivery quantity relation between the process and the valve, a Industrial Valves size can have many size of the actuator selection scheme. So the user can't simply standby actuators for valves. In addition, it can accurately job for the technological process and valve actuators are likely to be the ruler size too small or too large. If the actuator size is too small, the main problem is not to overcome the friction process and valve. If the valve size is too small, slightly and irregular trip if there is not enough activities and may not conform to the requirements of the closure, the valve will work hard to overcome resistance to its work force. In addition, if the actuator is hard enough to reduce piston close to seating and sealing, will produce & other; Bath crock atresia & quot; Effect and closed component fell into the seat and seal, the water hammer effect. If the size of the actuator is too small, it cannot accurately opening, closing, or throttling.

if the actuator dimension to the main fault is higher cost of actuator. In addition feet too big actuator is heavier and higher, it may produce earthquakes, footprint and maintenance difficulties, such as an interest. By the performance point of view, the larger actuators in speed and more slow response. Larger actuators will generate large thrust, if there is no process force against the push, the force will damage the Industrial Valves internals. Size is too large, therefore, the executing agency need to use a pressure regulator, the pressure regulator may produce incorrect setting and additional problems such as slow response.

1, usually actuators a tendency to size is too large, because the user to add people the safety factor in the design process and manufacturing to ensure that in the worst happens protection effectively. If the calculation results show that a ~ and valve actuator size for a given process is barely fit or slightly too small. So most users tend to choose a nearby large size valves. But because in determining the size of the process has been added in the process of safety coefficient, if no special requirement, the smaller the size of the valve in fit the process during operation.

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