Control valves as the implementation of components in the process industry has always been the production process plays an important role in the performance of control valves directly affect the production process and the failure rate, and even normal production. With the process technology and control technology, process industry growing large economies of scale, and increasing processing capacity, so that the valve performance, even if a small percentage, but also a lot of revenue. Based on this situation, flow control valves for the industry are rising ever higher, coupled with the advantages of rotary valve itself, which makes rotating valve of the valve than the traditional access to more and more applications.
The characteristics of a rotary valve
Valves are usually divided into straight and rotary program two broad categories. Straight trip through a linear motion valve components such as the gate to allow or cut off the logistics. Linear programs have cut-off valve valve, gate valve, valve and so on. Rotary valve through a rotation of the components to allow or cut off the logistics. Rotating parts can rotate 90 degrees is called the Rotary Valve 1 / 4 Rotary Valve. Sometimes 1 / 4 rotary valve can be extended to the classification of less than 270 degrees angle of spin valve. By definition can see through the spin valve is a rotating baffle rotating components such as rotary valve 90 degrees so that the changes from the open spaces to place the rotating valve clearance. Rotary valve has the following general characteristics. (1) adjustable range
Adjustable in the range of process industry is the most critical rotating valve adjustable range of approximately 150:1 (VALTEK range of ball valve can be adjustable 300:1, butterfly valve and adjustable cam deflection range 100:1). The corresponding cut-off valve for the adjustable range of 30:1, meaning that 5 rotary valves can provide a wide adjustable range of times. For example, the maximum flow is 1000 liters / min, closed-type valve can effectively reduce the flow to 30 L / min, while rotating flow valve can be adjusted to less than 10 L / min, the critical flow more precise valve control in the process repeatability of better, and directly reduced the flow of industrial products had failed to pass.
Eccentric rotary valve features two adjustable to increase its scope, the first of its hole plate design, eccentric is an effective 1 / 4 of the park, eccentricity is the V-shaped spool, the spool is a traditional park shape, when the eccentric rotary valve was kept closed, it's smaller V-enabled form in low-flow very precise control of high-volume, it almost with the valve open to almost the same diameter pipe. The second feature is the implementation of the machine rotating valve travel agencies with the implementation of the membrane must visit and the two cylinders. 1 "cut-off valve of the trip is about 3 / 4" ~ 7 / 8 "and rotary valve trip more than two." Any other size of the valve. The greater the input of the trip, the client control in the workplace as possible.
Ratio of high-adjustable control valves provide precise formula required proportion, irrespective of the size of traffic flow path, the traditional linear or regulating valve is no longer adapted to the task, rotating valve device can improve performance while reducing control valve life cycle in the factory in operation costs. Adjustable range of the rotary valve allows the user to close off to improve the standards, thereby enhancing the cost / benefit indicators. Together with the metal valve seat made of special materials with the village to extend the service life of valves to improve valve performance. The rotation of the structure of simple design, can minimize the maintenance workload. Owners to reduce production costs. (2) close to cut off
Straight trip valve stem into and out of the body axis, with each cycle of products, designed for straight trip to avoid leakage is difficult, it will be do not want the product to the production process into the system, and can have a greater unacceptable leakage outside the plant volatile. Rotation of the rotary valve design is essentially the problem does not exist, because such a valve using a low-lag, high thrust-style executive body of the cylinder to provide than other forms of executive body of the stability of a higher more accurate, it can provide long-term metal cut off the valve seat tight. (3) the flow capacity of large-size small
Straight trip the flow valve is installed capacity of the pipeline valve flow capacity of the scores, the ability to improve circulation by increasing the valve size straight trip, usually larger than pipeline. Rotary valve capacity is about the same size valve straight trip for 2 ~ 3 times, spin valve can be used to increase the amount of admixture pipeline without any change in the size of the feed, you can greatly reduce costs, for this reason, some rotary valves have been designed to replace the cut-off valve flange face of the flange connection form, and connected with bolts, such valve replaced by even more than their cut-off valve is also cheaper. (4) anti-cavitation
Expenditure in the process industry can cause a large number of cavitation, cavitation damage to pipelines may produce unacceptable noise levels, while perturbation of the measurement system caused by unclear or unreliable readings, rotating valve design with solid , greatly reducing the water hammer phenomenon as a result of actions caused by the failure of the valve, at the same time part of the valve core can absorb the extra energy, significantly reducing cavitation and related issues. (5) No external leakage
Standard than the standard rotary valve design of the cut-off valve outside the leak than 100 times, the valve stem out of the campaign will be sand dust into the valve in order to damage the graphite filler. Rotating valve stem without any access to the mobile, which makes a rotating movement, so as not to hurt the fill, to avoid external leakage. (6) spare parts and maintenance costs
Block rotary valve metal valve than the cut-off is much less spare parts, maintenance is often easier.
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