What types of valves are used in soda ash production?

I’ve left the factory, so I can’t help you. I suggest you call a lime factory directly to ask; in the past, cast iron was used for pipes that were prone to clogging, but it’s no longer used nowadays – pipes made of PVC (I can’t remember exactly) are used instead. Equipped with corresponding valves.

I think PVC pipes aren’t very useful. We mainly use it in some overflow lines. What about the other factories? Is it used in the same way?

This post was last edited by wal5980729 on 2009-12-15 22:14. Globe valve: The axis of the globe valve’s stem is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it features a very reliable shut-off action; this makes such valves ideal for cutting off, regulating, and throttling the medium. Once the disc of a globe valve is in the open position, there is no longer any contact between its seat and the sealing surface of the disc. This ensures a highly reliable shut-off action, making this type of valve ideal for cutting off, regulating, or throttling the flow of media. Once a globe valve is in the open position, there is no longer any contact between its seat and the sealing surface of the disc; as a result, mechanical wear on these sealing surfaces is minimal. Moreover, since the seat and disc of most globe valves can be easily repaired or replaced without having to remove the entire valve from the pipeline, this is very convenient in situations where the valve is welded to the pipeline. The direction of flow of the medium through such valves is altered; therefore, the flow resistance of globe valves is higher than that of other valves. 　　The commonly used globe valves are as follows: 1) Angle-type globe valve ； In angular globe valves, the fluid only needs to change direction once, resulting in a lower pressure drop across the valve compared to globe valves with conventional designs. 2) Direct-flow globe valve ； In straight-through or Y-type globe valves, the flow channel of the valve body forms an angle with the main flow path; as a result, the degree of disruption to the flow pattern is less than that in conventional globe valves, and consequently the pressure loss across the valve is also lower. 3) Plunger-type globe valve: This type of globe valve is a variant of the conventional globe valve. In this valve, the valve disc and seat are typically designed based on the plunger principle. The valve disc is polished to form a plunger that connects with the valve stem, and sealing is achieved through two elastic sealing rings fitted over the plunger. The two elastic sealing rings are separated by a collar, and the sealing rings around the plunger are pressed in place by the load applied to the valve cover by the valve cover nut. The elastic sealing ring can be replaced and is made from a variety of materials. This valve is primarily used for opening or closing, but it also comes with special types of plungers or rings that allow for flow regulation. Gate valves: Gate valves are used as shut-off valves. When fully open, the entire flow path remains unobstructed, resulting in minimal pressure loss for the medium flowing through. Gate valves are typically suitable for applications where frequent opening and closing are not required, and where the gate plate needs to remain fully open or fully closed. Not suitable for use as a regulator or throttle. For high-speed flowing media, partial opening of the gate plate can cause vibration in the gate, and this vibration may damage the sealing surfaces of the gate plate and the valve seat; moreover, throttling exposes the gate plate to erosion by the medium. In terms of structural form, the main difference lies in the type of sealing element used. Based on the design of the sealing element, gate valves are often classified into several different types, such as wedge gate valves, parallel gate valves, parallel double-plate gate valves, and wedge double-plate gate valves. The most commonly used types are wedge gate valves and parallel gate valves.

This post was last edited by wal5980729 on 2009-12-15 22:16. Butterfly valve: The butterfly disc of a butterfly valve is installed in the diameter direction of the pipeline. Within the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around its axis by an angle ranging from 0° to 90°; when it reaches 90°, the valve is in its fully open position. 　　Butterfly valves have a simple structure, are small in size and light in weight, consisting of only a few components. Moreover, it can be quickly opened and closed by just a 90° rotation, making operation simple; at the same time, this valve boasts excellent fluid control properties. When the butterfly valve is in the fully open position, the thickness of the butterfly disc is the only resistance to the flow of the medium through the valve body; as a result, the pressure drop across this valve is very small, giving it excellent flow control properties. Butterfly valves come in two types of sealing: elastic sealing and metallic sealing. Elastic-sealing valves, where the sealing ring can be embedded in the valve body or attached around the butterfly disc. 　　Valves with metal seals generally have a longer lifespan than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can withstand higher operating temperatures, while elastic seals have the drawback of being limited by temperature. If a butterfly valve is to be used for flow control, the key is to correctly select its size and type. The structural principle of butterfly valves makes them particularly suitable for manufacturing large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical engineering, and water treatment, but also in the cooling water systems of thermal power plants. 　　The commonly used butterfly valves are wafer-type butterfly valves and flanged butterfly valves. In a wafer-type butterfly valve, the valve is connected between the flanges of two pipes using double-ended bolts. In a flanged butterfly valve, the valve itself has flanges; these flanges at both ends of the valve are then bolted to the pipe flanges. The strength performance of a valve refers to its ability to withstand medium pressure. Valves are mechanical devices that are subjected to internal pressure; therefore, they must possess sufficient strength and stiffness to ensure they do not crack or deform over long periods of use. Ball valve: The ball valve evolved from the plug valve. It has the same 90-degree rotation action, but the difference is that the plug body is spherical, with a circular hole or passage running through its axis. The ratio between the sphere and the opening should be such that when the sphere rotates 90 degrees, the entire area at the inlet and outlet should be covered by the sphere, thereby blocking the flow. 　　The ball valve can be tightly closed with just a 90-degree rotation and very little rotational torque. The completely equal internal cavity of the valve provides a flow path with very low resistance and a direct route for the medium. It is generally believed that ball valves are most suitable for direct on-off operation, but recent developments have designed them to also serve the purpose of throttling and controlling flow. The main advantages of ball valves are their compact structure, ease of operation and maintenance. They are suitable for use with common working media such as water, solvents, acids, and natural gas, as well as for media under harsh operating conditions, such as oxygen, hydrogen peroxide, methane, and ethylene. The ball valve body can be integral or modular.

This post was last edited by wal5980729 on 2009-12-15 22:18. In the soda ash industry, slurry valves are generally used for fluids containing crystals. Introduction to Slurry Valves Slurry valves represent an advancement in terms of valve structure, sealing methods, driving mechanisms, and electrical control systems, built upon the absorption and integration of advanced valve technologies from both domestic and international sources. It has many advantages such as a simple structure, small size, light weight, low flow resistance, minimal sedimentation of the medium inside the valve body, and easy installation. It also features manual and electro-hydraulic operation options. Electrical control: Controlled by travel switches and position indicators, it achieves a multi-functional system that integrates mechanics, electricity, hydraulics, and instrumentation. Valves of this type should generally be installed horizontally in pipelines. Structural form and characteristics: a. Valve body structure and sealing method. Slurry valves are available in wafer-type and integral types; the wafer-type valve bodies use a \"U\"-shaped and \"T\"-shaped composite structure made of composite materials for sealing. The integral valve body sealing utilizes an “O”-type composite seal ring structure, overcoming the drawbacks of traditional wafer-type slurry valves, such as the tendency of the “U”-type gasket to shift and deform under stress, leading to fluid leakage. The gate plate features a knife-shaped structure, which solves problems such as mortar settling in the sealing groove, poor valve closure, and external leakage. 　　b. The actuation devices are available in manual and electro-hydraulic types. Manual device: Simple to operate, suitable for valves with low torque. 　　Electro-hydraulic actuator: Suitable for valve systems that require high torque, with adjustable force and speed, and capable of locking in any position. Applicable media: Mining, steel industry – used for coal slurry, filter residue slurry, etc. 　　Purification units – used for wastewater, sludge, dirt, and clarified water containing suspended solids. 　　Paper industry — used for pulp and white water mixtures at any concentration. 　　Sugaring industry – used for beet washing, syrups, juicing, fruit juices, etc. 　　Food industry – used in washing and rinsing equipment, grain conveying equipment, malt mash, etc. 　　Power plant ash removal – used for ash slurry.

I specifically consulted today the supervisor who works in the ammonium chloride workshop, my mentor. He said that currently, the materials used for the mother liquor pipelines containing ammonium chloride are: 1. Stainless steel pipes； 2. Nylon tube (slightly more expensive than the next two options) ； 3. Steel-lined PO pipe ； 4. Spring-containing PE pipes (made from various waste tires, etc.). Stainless steel is used for pipelines carrying liquids at high temperatures, while other types of pipes are used for pipelines where the liquid is at normal temperature. Valves: There are rubber-lined valves, which are made of cast iron or carbon steel with a corrosion-resistant lining. There are also various direct-flow rubber-lined valves. Additionally, there are plug valves, ball valves, etc. Naturally, stainless steel pipes are paired with valves made of stainless steel

Thank you for your concern and reply above; I hope for more guidance and communication.

It is recommended to post this question in the newbie thread.