independent controller's main advantage is in maintenance controller without disassembly of the valve. The disadvantage is that the total height is higher than other kind of valve structure. Other commonly used linear manual controller structure is subordinate linear handwheel controller, its the handwheel institutions within a set directly on the valve cap, as shown in figure 5. 2. In this case, the generation of a yoke is fixed on the valve cap wheel nut. The overall stem has a variety of operating functions, is closed element and the handwheel. The obvious advantage is this structure is better than independent controller Industrial Valves height decreases greatly. Problems in the disposal of the controller is weakness, it is necessary to remove some of the valves.

there are two kinds of linear controller structure categories: rising stem structure and non-rising stem structure. ; Rising stem nut compression up your hand wheel by hand wheel stem structure, when the hand wheel nut rotation, above the handwheel stem ascending to the handwheel. Many manual linear motion valves using bar type controller. Non-rising stem structure, on the other hand, typically used for slave mode controller. Wheel rotation is holding and with threaded stem, stem and closing element ( For example, wedge) Joint. When the hand wheel rotation, closed - along with it The rotation. Closure device is designed to be fixed by guide, so it cannot turn this closure components as stem! Rotation and lifting or lowering.

as I mentioned earlier, the most commonly used tool for the manipulation of linear manual controller is to use the handwheel. According to the condition and the structure type, the handwheel has a completely different surface processing, from smooth to rough. Some oil and refining conditions need to be strong hand wheel to ensure still intact in the fire. Referring to the hand wheel has higher security of additional advantages, through the use of the locking mechanism is placed on the controller, to prevent accidents in the Industrial Valves or deliberately touch anyone. Another common wheel structure is sprocket. Sprocket is the handwheel with teeth or slot, with long ring chain, so that the operators in the place where far away from the Industrial Valves operation.

rotary motion manual controller is used jointly with a quarter of rotary valve, plug valves, ball valves and butterfly valves. A quarter - rotation Rotary closed element is the most effective way to make use of the min rod orthogonal extension, it can leverage. Rotation movement of the two most common types of manual controller is handle and move the hand. Many technicians believe that the two terms are interchangeable, but actually there is a difference between them. Handle to the bolt connection are used closed components of valve stem ( Figure 5. 3)

low level and are often used to smaller valves. Make up to 6 (in handle rules for size DN150) A seat ball valve and sizes up to 8 (in DN200) The butterfly valve. Move the hand is not always fixed on the valve stem, surface can be controlled by a transfer to another - valve - On the valve ( Figure 5. 4) For valve control personnel will be put in special places, and listen to its natural and don't have to worry about accidental or intentional collision. Pay hand normally used for cold rotary valve, valve core can be used with the sleeve to 4 (in DN100) To bring the lubrication valve core can be used to 6 in ( DN150) 。 In some ball and butterfly type manual control valve, the handle and the stem can be as a whole, but the most common and cheapest structure is to use the detachable handle, the handle ( Or move hand) With cutting openings, its shape and the same cock valve stem. A square stem any - within four quadrants - To handle or move hand positioning. And flat stem only for both sides in the two position ( Before or after) The - Be used for positioning. Handle to use bolt and lock washer is fixed on the valve stem.

At a time when technology is essential for flow control valve, ensuring that it works in a symbiotic way with your human employees is key.
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