In the chemical industry, the right valves are essential for controlling the flow of diverse chemicals. In some cases, these are corrosive in nature, too. Such a fact, explains that chemical valves must meet stringent criteria so that they can handle various acids and slurries.
The chemical industry utilizes a range of valve types. Each has its own distinctive qualities and must be tailored for specific tasks.
In this guide, we’ll explore the ideal chemical valves for the chemical industry. We’ll discuss important factors that make these valves effective in handling the demanding environment of chemical plants.
Understanding Valves for Chemical Industry
Chemical valves are specialized devices designed to control the flow of chemicals and other fluids within industrial systems. Acids used in such an industry are diverse. These may include corrosive acids and slurries. Thus, chemical valves must meet stringent criteria for material compatibility, durability, and safety.
Types of Valves for the Chemical Industry
Gate Valve
Gate valves are widely used in the chemical industry for a variety of tasks. Their features and benefits allow them to withstand extreme temperatures, pressures, and other stresses.
They can be operated either manually by hand-wheel or electrically through an actuator. The basic mechanism is straightforward: the hand wheel rotates a stem that moves the gate up or down through threaded holes in its stem.
Some designs employ springs (known as live loading) to apply constant pressure to the seal, thus reducing fugitive emissions.
Gate valves should never be operated other than in their fully opened or closed positions, as partial opening can expose internal components to premature and uneven wear due to flow pressure and flow against the gate.
Globe Valves
This class of valves is ideal for precise flow control. Globe valves have a spherical body with a movable plug or disc. The latter regulates flow by varying the size of the flow passage.
Glove valves are ideal for applications that require accurate control and regulation of fluid flow. The valves are often utilized in chemical processing where precise adjustments are necessary.
Check Valve
Check valves are essential tools in the chemical industry for controlling fluid flow. They prevent media from reversing in the system, which could cause backflow, damage equipment, or disrupt processes.
These one-way or non-return valves open and close based on the pressure differential between their inlet and outlet. This differential, known as the ‘cracking pressure’ of a check valve, should be taken into account when matching it to your system.
Xintai offers a comprehensive selection of check valves designed to meet various applications. These come in an extensive range of sizes and materials.
Plug Valve
A plug valve is a type of valve with an internal hollow passageway, creating an opening through which it can connect its inlet and outlet ports. This hole serves as either a flow-diverting or combining device.
These valves are an ideal choice for chemical industries, as they are capable of withstanding corrosives without clogging. Furthermore, they can be employed in low-pressure lines and require minimal upkeep.
Plug valves come in several varieties, such as lubricated, non-lubricated, and expandable. A lubricated valve uses a lubricant between its plug and body to reduce friction and seal ports tightly.
Ball Valves
Ball Valves are a commonly used type of valve in the chemical industry. They offer flow and pressure control as well as shutoff for corrosive fluids, slurries, normal liquids, and gases.
Another advantageous quality of ball valves is their leakproof seal when closed. This property makes them popular among chemical industry professionals due to their superior chemical resistance.
Slurries in many industries contain hard particles that can stick to metallic parts, potentially leading to damage or corrosion of valve seats and flanges over time.
Butterfly Valves
The butterfly valve’s unique feature involves a rotating disc that controls flow. This disc is mounted on a central shaft. It can be rotated 90 degrees to open or close the valve.
The valves are often used in large pipelines for their ability to handle substantial volumes of fluid. Thus, these valves are utilized in the pharmaceutical, chemical, and food industries. A butterfly valve is also ideal in the water flow control in dams and hydroelectric power plants.
Pressure Relief Valves
Pressure relief valves are essential in critical fluid systems such as chemical plants and refineries, where proper pressure levels are essential to ensure safe operations.
Direct-Loaded Pressure Relief Valves are spring-loaded discs that open to release liquid when the pressure inside exceeds a preset point. They find application throughout the chemical industry.
Material Considerations for Chemical-Resistant Valves
Chemical-resistant valves are engineered to withstand corrosive effects, pressure extremes, and operational stresses. Below are some material considerations in creating chemical-resistant valves:
Stainless Steel Valves
Stainless is a renowned material due to its exceptional corrosion resistance and strength. Stainless steel valves are commonly used in the chemical industry due to their ability to handle a broad spectrum of chemicals, including acids, bases, and solvents.
High-Pressure Valves
These valves are utilized to operate under extreme pressure conditions. The valves are constructed using materials that can withstand substantial pressure without deforming or failing.
Forged Valves
Forged valves are manufactured using a forging process, where metal is heated and shaped under high pressure. This process enhances the material’s strength and durability, making forged valves particularly suitable for demanding applications.
Factors that Need to Be Considered When Selecting Chemical Valves
When selecting chemical valves, it is necessary to determine the type, size, material, and other parameters of the valve according to the specific application. The following are some factors that need to be considered:
- Type of fluid: The chemical industry involves a variety of fluid types, including gases, liquids, and semi-solids. Different fluids have different requirements for valve materials, sealing, etc.
- Size of the flow: The size of the flow determines the size and structure of the valve.
- Pressure requirements: Valves used in the chemical industry typically need to withstand high pressures. Therefore, the materials and structure of the valve need to meet the pressure requirements.
- Corrosion resistance of the medium: The media used in the chemical industry often have corrosive properties. Therefore, the material of the valve needs to have good corrosion resistance.
The chemical industry has very strict requirements for valves, so when selecting chemical valves, it is necessary to fully consider the above factors to ensure that the valve can meet the actual application requirements.
Choosing Industrial Valve Manufacturers
Selecting a reputable industrial is key to ensuring quality and durability. Xintai Valve is a notable player in this field. The company specializes in manufacturing reliable chemical valves, including those made from forged valves.
Xintai Valves is recognized for its expertise in forged valve manufacturing. Their product lineup includes high-quality valves designed to meet the exacting standards of the chemical industry. With a focus on precision engineering and material integrity, Xintai Valves provides solutions that enhance the safety, efficiency, and reliability of chemical processes.
