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800 globe valve is one of the most popular valve types as it is helpful in many industries. Common places are where large pipes and flow control should be used. Valves come in different shapes, each with unique properties and advantages. Common shapes include:
Parallel Disc Globe Valve
This valve is characterized by two flat discs that compress against a seat to close and prevent fluid from passing through. The discs are parallel to each other and help provide even sealing and low flow resistance. Its great sealing capacity makes it good for fluids with high viscosity.
Plug-In Disc Globe Valve
This valve has a plug-shaped disc that rotates and fits into the seat to stop fluid passage. The design of the plug-in disc helps ensure a tight seal during closure. Valves of this kind are commonly used with gases or steam, where a hardy, well-sealing valve is needed.
Wedge Seat Disc Globe Valve
The wedge seat disc is shaped like a wedge, with the seating surface angling out. As the disc rises, the wedge shape causes it to converge and seal against the seat. Wedge seat valves are suitable for high-pressure environments. They can also survive harsh operable conditions and have a long serviceable life.
Tandem Disc Globe Valve
The tandem disc consists of two parallel discs linked by a spring or rod assembly. One disc remains stationary, while the second rotates and moves up or down. This type of disc provides redundancy in sealing and helps absorb seat wear. It is mostly used in sectors with high fluid leakage potential.
Composite Disc Globe Valve
The composite valve has varied materials for the discs and seats. This is to help improve their resistance to corrosion, erosion, and wear. Plus, the combination of distinct materials offers added flexibility in choosing resistance characteristics. They are suitable for extreme environments, where one material alone may not be good enough.
Oil and Gas Industry
The globe valves are used to control the flow of crude oil and gas through pipelines. The irregular shape of the valve makes it perfect for precise metering needed in upstream extraction. They are also able to withstand the immense pressures typical of oil and gas transport. Their sealing capability keeps products from leaking, which is crucial for safety and to prevent environmental pollution.
Water and Wastewater Treatment
Water treatment plants depend on globe valves to regulate flows during filtration, chemical dosage, and disinfection activities. Globe valves help maintain the right amount of water moved through treatment processes. They are also critical in controlling wastewater flow during the dangerous discharge processes. This ensures compliance with regulations prohibiting hazardous wastes from contaminating the environment.
Power Generation
The globe valve utility valve controls steam generation, turbine rotation, and cooling water flow in power plants. Precise control is crucial in power generation, especially in steam-based electricity generation mechanisms. Globe valves guarantee steam flow is maintained at right levels for efficient energy production. They are also used in nuclear plants to control radioactive coolant flows.
Chemical Processing
The chemical industry utilizes globe valve to control caustic chemical flows during processing. Some chemicals can cause severe damage to equipment if not well controlled. The globe valve provides a tight seal and great control in preventing chemical spills. They are also used to resist corrosion as they come with many protective materials from different manufacturers.
HVAC Systems
In large buildings, globe valves help control water flows in heating, ventilation, and air conditioning systems. Smooth regulation maintains the right temperature and ensures the valve can shut off water flow when required. This keeps various HVAC components from getting damaged. Maintenance needs are also lower compared to other valve types.
Industrial Manufacturing
Industrial Globes Valves might be used to control fluid flows during various industrial manufacturing processes. Be it in mixing, dilution, or material transport and delivery processes, globe valves provide better precision and are easier to operate. Automatic versions make flow control easy in fully automated factories.
Flow Control
The design allows it to control fluid flow rates and hence restrict or allow the flow. Because of its linear motion, it very much resembles the civil engineering feature from which it got its name. This is precise flow control; thus, it has wide industrial and commercial applications.
Sealing Ability
It has great sealing properties because of its closure mechanisms. This prevents fluid from leaking even when the valve is closed. This makes it very useful in fully containing hazardous chemicals and other fluids that need to be contained.
Versatility
It can work in a variety of conditions and with different fluids and gases. It can also be used in a variety of industries, ranging from oil and gas to manufacturing and even commercial buildings. This versatility makes it a go-to valve for many applications.
Durability
It is constructed of highly durable industry materials that enable it to endure extreme temperatures and pressures. The materials include metals and alloys such as stainless steel and hardened steel. These materials resist wear and tear, allowing them to serve for decades.
Increased Efficiency
The valve structure causes less turbulence compared to other valve types, such as gate or ball valves. This means less energy is required to move fluid through the globe valve, which increases system efficiency.
Preparation of the Valve
Remove all accumulated rust from the installed parts. Apply thread sealing tape to the valve's end pieces that have threaded connections. This will help prevent leaks at the connection points. Lastly, ensure the valve orientation is correct based on the system flow direction. This is indicated by an arrow on the valve body.
Preparation of the Pipe
The pipe near the valve ends should be cut clean and smooth to remove any burrs. This allows for better connection to the valve. Both threaded ends should be sufficiently coated with pipe dope if using a threaded installation. This provides a better seal between the threads. Lastly, the threads on the pipe should be wrapped with thread sealing tape for better sealing protection.
Installation of the Valve
To install a flanged valve, place the valve between the two connected flanges. The flange bolt holes must be aligned with the valve flanges. For threaded valves, secure the valve to the pipe by rotating it clockwise. Use a wrench to grip the valve hexagonous sections and turn for better leverage. The valve should be tightened until snug but not to the point where overtightening occurs, which can end up damaging the valve.
Finalizing the Installation
Double-check the orientation of the valve to confirm it is correct. After ensuring proper orientation, tighten the valve connection further with the wrench. Once the connection is secure, test for leaks. This is done by running fluid through the system and checking the valve connection points.
Types of Maintenance and Repair
All maintenance and repairs must be done with shutoff valves closed and the pressure relieved at least two valve lengths downstream. Always ensure the globe valves are easily accessible for inspection and servicing.
Lubrication
Lubricate all stems, threads, and handwheel components of valve globes regularly so they do not seize up upon next use. Proper lubrication prolongs lifespan and helps maintain good function. Also, lubricate areas with grease and not mixed with others to avoid corrosive elements forming. Lubrication intervals depend on the environment and usage frequency but check and oil at least every 6 months.
Seating Surface Inspection
Care must be taken to check the seating areas of valve globe discs and seats every so often. Any need for replacement due to wear and tear should be addressed immediately to prevent fluid from leaking. Seating surface damage decreases the valve's ability to control flow and seal. Therefore, check for scratches, dents, or abrasions, and replace damaged parts immediately.
Bonnet Nut Tightening
Check to see that bonnet nuts are properly tightened. If slack, it can cause valve stem misalignment and seat surfaces not coming together properly to seal. A tight bonnet nut ensures the disc exerts even pressure on the seat. This improves seal and flow control. Conversely, overtightening can lead to thread stripping or cracking.
Valve Exercise
Regularly exercising globe valves by fully opening and closing helps prevent corrosion deposits from accumulating and freezing the valve. It also helps the rubber/seal extents to be evaded and succeed within the valve. Exercise valves as often as needed to keep them functional. This could be once a month or more, depending on the environment and application.
Leaks Detection
Frequent fluid leaks around the valve indicate flaws that require immediate repair. Monitor for leaks and inspect valve internals for signs of damage or wear. Leaking valves cause energy loss, hazardous fluid spills, and potentially a fire. Because of this, replace leaking valve components immediately.
Leak Prevention
Leak prevention is important as leaking chemicals can cause health risks to those working there and people nearby and cause serious explosions. Leakage can also negatively impact the environment by contaminating soil and water. To prevent leaking through valve repair and replacement, there must also be proper training for employees on how to handle valves safely.
Pressure Management
Improper pressure control can turn catastrophic since overpressure can cause valves to burst and release hazardous fluids explosively. Underpressure causes valve instability, leading to process interruptions and unsafe operating conditions. To mitigate these risks, install pressure relief devices and regularly monitor and maintain pressure control systems.
Regular Inspections
Globe valves are used frequently in many industries. This means quality checks need to happen at least daily. If found faulty, they must be replaced before being used again. Not doing so can cause injury or harm in real life. One affected valve can throw an entire production line out of whack and lead to bad fluid contamination and spoilage.
Material Compatibility
The material the globe valve is made from and the fluid passing through it must be compatible with each other. The Globe valve materials must resist corroding to guarantee safety and quality. For instance, if the fluid is too acidic, it can corrode the valve material and result in leaks. Proper sealant, material, and valve selection should be done based on fluid analysis reports. This is typically done by a Chemist from the plant's lab department.
Installation and Repair
Valves must be installed correctly to function well. A wrong installation makes pressure imbalances that can be dangerous. Repairs also need to be done carefully, and only qualified personnel should handle them. This might involve bringing in a specialist from outside the company, depending on the valve type and the problem experienced by the valve.
Emergency Procedures
Companies must always have procedures to be followed if something goes wrong. This includes leak detection, emergency evacuation, and contamination cleanup procedures. All employees should be trained in these procedures and drills regularly. It helps ensure a swift and effective response that minimizes harm to workers, the public, and the environment.
A1. Its main purpose is to regulate fluid flow. This makes them ideal for controlling processes where precise flow rates are essential. They also help with shutting off flow when needed. Although ball and gate valves can also do this, the globe valve is better at creating a tight seal.
A2. They are widely used in many industries. These include oil and gas, water treatment, power generation, chemicals, HVAC, and manufacturing. Their versatility, durability, and precise flow control make them invaluable in many applications requiring reliable flow regulation. Another reason is that most industries nearby had emergency procedures set before and were fabricated from materials that would not catch fire or easily explode, hence enhanced safety.
A3. A globe valve controls fluid flow by regulating the amount allowed through, whereas a check valve permits fluid to flow in only one direction, preventing backflow. They have distinct functions, with globe valves focused on flow control and check valves on backflow prevention.
A4. Its main function is to control the fluid flow rate in a system. It does this by allowing precise adjustments to be made, enabling fine-tuning of process conditions. For instance, in chemical manufacturing, maintaining the right flow rate is crucial for producing quality products. Therefore, the valve's precise control ensures that the fluid is delivered in exactly the right amount to maintain process stability and quality.
A5. It can be used in either direction, but flow control and sealing are more effective when the flow is in the intended direction. This is the direction of the disc seat on the valve body. Manufactures imprinted arrows on the valve body to indicate the correct flow direction.
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