5. Discussed in section 1, in order to operate the valve, manual controller to people's physical strength and the ability to locate. The general manual controller involved - open Close condition, and don't need high accuracy of working condition of simple throttling or immediate feedback. In the third chapter talked about most of the manual Industrial Valves adopts manual controller. Manual controller to the advantage of its mechanical simplicity a few moving parts and no seal leakage and failure caused by the air chamber. People to manipulate a unit ( For example the handwheel or lever) And make the valve opened and closed or in the middle. The structure simplification means easier for maintenance, maintenance, and remove. Manual controller disadvantage is that the response is slow, because the response depends on the people operating manual controller to it sometimes takes a - in some cases Some time. For example, a linear turn the handwheel to 30 or more revolutions to close Four stroke in the valve, and people must quickly when handling manual valve takes the arrival of the valve's journey time increased the response delay. If you need the throttle ( Travel between 1 t) , valve depends on the regulation of the controller, the controller of the adjusting range is very big. Under certain conditions these is not a problem, but over the years when the system requires more accurate, use manual controller to determine the correct choke point is difficult.

manual controller generally fall into two categories: linear motion and rotation motion. Linear movement of the manual hand wheel is used to fix on the position of the handwheel assembly parts, the yoke or shell, for example, it and move the parts ( Usually a handwheel stem) With threaded connections between. Manual parts organization ( In most cases is the handwheel) The rotation for many times, make the motion of the valve stem produces movement, the valve stem and linear movement of the closed connected components.

one of the common structure as shown in figure 5. 1, as shown in figure said in a separate line the handwheel controller, it is directly installed on the Industrial Valves body assembly, rather than the integral parts of the valve. Actuator adopts yoke well will support the handwheel institutions controller installed on the valve. The inner diameter of the yoke part and the body of the fitting is called positioning pin. Yoke of positioning pin is installed on the bonnet, and yoke nut or other fixed clamping facilities. Closure components of the valve stem, such as valve core rod, compressor rod or ram rod, is made of thread connection to the handwheel at the bottom of the rod. Cover the upper portion of the yoke hand wheel nut, the nut with hand wheel rotation. Some structure is the handwheel and nut as a whole, while the other is to separate them by material factors. When the handwheel and nuts are separated, the key or debt -- nut to fix the handwheel and hand wheel nut. Hand wheel nut was holding in place, and provide the foot movement, internal drilling and tapping the thread with a handwheel stem connection.

the handwheel external thread screwed rod matching people inside the hand wheel nut, and estimate to several button thread for positioning and mesh. ACME thread standard commonly used manual controller. In order to prevent the same material often contact to bite, the handwheel stem and hand wheel nut manufactured dissimilar materials. Most common combination is nut use Huang Gang or steel blue, use stainless steel stem. When the hand wheel is rotating, fixed on the hand wheel nut rotate handwheel stem travel thread, according to the rotation direction of the handwheel, the valve stem elongation or shortening. Stem elongation or shortening of the manipulation of the luxury closed linear motion components. In many larger structure or high pressure condition, roller or seat on top of the handwheel and yoke part with the parts with a youthful appearance or friction, in order to make the handwheel is relatively easy to rotate.

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