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Valves lime milk special regulating valve in the soda plant
1, the use of location: Xinjiang Hami Shuangheyeye 200,000 tons of soda ash expansion project 2, use: heavy alkali workshop ammonia distillation lime milk delivery regulation. 3, the scene conditions: Medium: Mash milk (main component: calcium hydroxide) and contains limestone particles, due to the previous process for the mesh filter caused by slag in the pipeline a certain amount of 1-2cm limestone particles. Valve pressure: 0.5Mpa; valve after: 0.4Mpa; flow rate: 45m3 / h; process diameter 100mm. 4, the original valve usage: In the construction of the factory when the choice of the United States imported Fisher pneumatic diaphragm valve, due to the production process before the regular replacement of a mesh, lime milk medium is relatively stable with a small amount of limestone particles below 0.5mm. Fisher control valve in use for more than a year, the valve core and valve seat erosion by solid particles and the valve body is also a certain amount of wear and tear, the final damage due to erosion of the valve seat can not be cut off and have to scrap. Due to the import of Fisher regulating valve is expensive, the arrival of a long period of other reasons in the subsequent years, the option has used a number of domestic valve manufacturers use products, but have failed (the use of time are not more than two months), many of them Domestic well-known professional control valve manufacturers products. Valve manufacturers are now on the domestic valve program provided by the program and the use of the problems to do a summary. Scenario 1: Pneumatic membrane through the use of direct control valve, and valve spool, STL full surfacing treatment, but the use of 10 days when the valve is blocked, the valve stem bending, the scene of the valve disintegration found at the cage and the valve at The card has a lot of limestone particles, so that the valve core can not move and cause bouncing, the valve stem bending deformation under the force of the membrane actuator. Option 2: V-type adjustment of the use of ball valve, through the use of one month after the internal leakage, the valve disintegration and found that the valve body and the side of the valve has been eroded by solid particles thin only 3mm thick. Option 3: Selection of lining ceramic valve, the valve for the full lining of ceramic, ceramic we know that high hardness, corrosion resistance, good erosion resistance; it has a better overall performance. The use of a week after the collapse of the collapse of the valve found that the ceramic lining has been crushed, valve erosion damage serious. The successful application of V1000 regulating angle valve In the process of communicating with users, we can know every detail of the process and adjust the technical requirements, and carefully listened to the advantages and disadvantages of the previous selection of the regulating valve. We think we still have to start from the most basic. First, the analysis of the characteristics of lime milk medium, which is converted into lime calcined lime and then react with water to generate calcium hydroxide emulsion, was alkaline has a certain corrosive. Lime milk contains a large amount of uncalcined limestone particles that are completely roasted and filtered through a 5mm sieve, but larger particles of limestone particles are caused to enter the next step due to the broken sieve in the sieve mesh. The regulator is installed in the pipeline into the next process. Followed by how to choose. Valve selection is based on conditions and control requirements selected matching valve. Let's analyze the problems with the above selected regulator. Pneumatic diaphragm through-hole single-seat valve, cage valve, the valve was S-shaped flow is not conducive to the smooth passage of granular media, granular media will valve trim and valve wall erosion, resulting in damage. If larger particles can not pass through the cage when the media will be stuck in the cage at the valve spool can not be adjusted action. V-type adjustment ball valve or eccentric rotary valve, solid particles containing medium for a long time on a side wall and the valve spool quickly washed, will appear in the valve wall and the valve core erosion damage and internal leakage. Finally, the full lining ceramic valve, although the ceramic valve has good wear resistance, erosion resistance, but the adjustment process, such as the larger solid particles play a role in the spool at the actuator thrust is very easy to make ceramic Valve broken. In summary, how to choose is the key. Shanghai valve special production of lime milk special angle regulating valve is designed for such conditions under the control valve. Here to introduce the special valve produced by Shanghai special dedicated adjustment valve for lime milk - V1000 regulation angle valve: (1) The valve body compact structure, the flow path is simple, the resistance is small, the flow is high into the low flow closure , With "self-cleaning" function. Second, the most important point it can maximize the protection of the spool is not washed. Because the medium flows through the valve seat, due to the valve seat of the current limit makes the medium from low to high speed, but also become low speed, resulting in most of the erosion and impact are consumed in the pipeline, thus protecting the valve and valve Body cavity wall. This is very important; if you choose to run, the result is exactly the opposite. (2) improved erosion-resistant valve seat structure can protect the valve core, the valve seat is not erosion. The valve plug and seat self aligning design, patented, naturally coincides with the spool and seat axis, allowing for a hard-seal, Class V, snap-on seat for easy removal. Spool and seat are all STL full surfacing, but also increased the spool, seat erosion resistance to improve the service life. (3) The integrated valve core and valve stem are used. The valve stem is 3-4 times the diameter of the traditional valve. The valve stem has a strong anti-unbalance force and eliminates the risk of bending and deformation of the valve stem. (4) The use of a special cage, the main role is to guide the axial direction of the valve seat to guide the role of the cage hole and specifically to expand, 1-3cm of fixed particles can pass, the wall thickness of 10mm, enhanced with special stainless steel Erosion, corrosion resistance. (5) Equipped with double acting cylinder actuator. Its advantages: large thrust is 4-5 times the film-type actuator, for small particles such as the valve core and seat between the very easy to crush it, there will be no congestion. (6) In addition to the valve body, specifically used thickened body, enhanced anti-erosion ability. From the actual investment point of view, operating six months after the collapse of the valve, the valve burning fire has been T custom?幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 幸 reading 苈 amazement ridiculously ridiculously apulia frog T customs çƒ çƒ Lu è ¼ 馓 Chen? 现 鸾 现 now Wu Huan Trade Ф ah? Chase å°½ Ñ‘ ?? ?? lemon? 0 minutes to replace and can be put into use. From the point of view of the effect has been far exceeded the user's time requirements, from the point of view of cost-effective than the United States imported Fisher pneumatic control valve. Shanghai valve special lime milk valve has been approved by the users of the Hami Shuanghe industry recognition and praise.