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GORE MAITRAYEE
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5 min read
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Nov 18, 2022
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The most typical device used to control fluid flow in a process is a control valve.
The control valve is a power-operated device that regulates the flow rate of a fluid in a process control system, according to the International Society of Automation.
If a control valve has the right accessories, it will function more smoothly and effectively and be more valuable for process control.
The following list shows the most commonly used accessories with the control valve, as per the requirements.
The vital part of a process control system, pneumatic control valve accessories help to ensure optimal operation.
A converter module is used in a current to pressure device to convert a 4 to 20 mA current input to a proportionate output of 3 to 15 psi pressure.
When a positioner’s high level of positioning accuracy is not necessary for some applications. Only an electro-pneumatic (I/P) transducer can be used in these situations.
When the actuator volume is very large, the control valve positioning reaction speed slows down.
Volume boosters are used to increase a valve assembly’s capacity for pneumatic thrust output. One volume booster is often used by single-acting actuators. At least two volume boosters are necessary for double-acting actuators.
A position transmitter’s main function is to give the control system independent, separate feedback on the position of each valve. As the control valve is used for process monitoring, troubleshooting, or startup/shutdown verification from the control room by an operator, position feedback of the control valve frequently becomes necessary.
The position transmitter, which measures the position of the valve stem or shaft, is directly mounted to the valve yoke.
To lock the valve in its current position in some situations, the solenoid valve will trap air in the actuator. To enable the valve to shift to its no air position in some situations, the solenoid valve will vent out the air from the actuator.
When the valve reaches a particular location within its range of motion, a limit switch is used to deliver a discrete open or discrete close input signal to the control system.
Limit switches located on the control valve and on the yoke can also be used by an operator in the control room for process monitoring, troubleshooting, or startup/shutdown verification.
Only specific feedback on valve position will be provided by these switches. According to our needs, these can be put on the control valve to provide extra feedback signals to the DCS or PLC systems.
In control applications where a specified actuator response is necessary in the event that the air supply pressure is interrupted, trip systems like air lock relays are used. These are utilized with single or double acting actuators to give pneumatic lock-up or with double acting actuators that do not have an inherent air failure condition.
The trip valve causes the actuator to fail up, lock the control valve in the last position, or fail down when the instrument air supply pressure drops below the trip point.
An air volume tank provides the reserve air capacity needed to operate the valve for double-acting applications in the event of an air supply breakdown and while the supply pressure is being restored. The trip valve automatically resets, turns normal, and permits the system to resume normal operation once the air supply pressure has increased above the trip point.
Adjustable travel stops are frequently utilized on the control valve’s handwheels for diaphragm actuators. In an emergency, they also offer a manual method of placing the control valve.
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They are arranged in two ways to a control valve.
Travel in any direction can be restricted using the side-mounted handwheel, but not simultaneously in both directions. The control valve’s handwheel can be left in the neutral position to enable automatic operation for the duration of the whole valve movement.
For “infrequent service,” top-mounted handwheels are utilized to manually turn the valve.
There are five basic reasons that accessories are added to a control valve:
Since 1986, TVI has provided quality valves and accessories to customers around the world. We offer a range of specialized accessories for everything from petrochemicals to pharmaceuticals. With an extensive selection of plastic and metal valves and components, we have what you need for fluid flow optimization. Learn more about our valve accessories below or browse our catalog.
Actuators
A valve actuator is the mechanism used to open and close a valve. It can be operated manually through the use of a gear, wheel, or lever; however, actuators that require more force often use hydraulic, pneumatic, or electrical power. Actuators can be automated for industrial settings, which is also more efficient and allows remote operation. All actuators from TVI are mounted and tested to ensure optimal operation. Our heavy-duty designs ensure reliable operation and long-term stability.
Stem Extensions
Valves are controlled through manipulation of valve stems, and a valve stem extension allows for buried valves to operate above ground level. This creates simple access to the valve without having to implement a more arduous solution such as valve pits, man holes, and other alternatives.
Manual Gears
Manual valves are often used to regulate the flow of liquid or gas within a system. In a gear-operated valve, a manually operated wheel or lever is connected to a gear. When the gear turns, it moves a valve disc, which controls the fluid flow. Manual gear valves offer a high level of control and accuracy. Our durable design is made of corrosion-resistant materials that can withstand a broad range of temperatures.
Threaded Lugs
Lug-style butterfly valves used in dead-end service generally have a reduced pressure rating. Lug-style valves are unique because both sides of the valve’s body have threaded inserts – which can be adapted for all types of liquid and constraint.
304 & 316 ss available
Corrosion-resistant
Dead-end service
Easy to Install
Locking Devices
Valve locking devices include butterfly valves, ball valves, and sluice valves. They prevent valves from opening during system repairs and maintenance, which helps to ensure worker safety. TVI’s valve locking devices incorporate durable, corrosion-resistant designs with an easy-to-use color display. We make our devices easy to install to reduce overhead and keep your operation running smoothly.
Valve Flanges
Valve flanges use bolts, gaskets, and other connectors to seal pipes, valves, and other fluid system components together. Although they may be welded together, removable flange hardware allows for easy maintenance, repair, cleaning, and inspection. TVI offers a wide range of corrosion- and temperature-resistant valve flanges with an exceptionally high degree of design accuracy and durability.
Valve Fasteners
Valve fasteners are the hardware used to connect components at joints in a fluid system. Common valve fasteners include screws, nuts and bolts, and wing nuts. TVI provides a range of valve fasteners in a variety of materials, including metal alloys, PVC, PP, and PVDF. Our valve cover fasteners are easy to use and inexpensive, with a compact, sturdy design and long service life.
Superior Valve Solutions From TVI
For more than three decades, customers have relied on TVI to provide superior fluid control systems and accessories. We continuously expand our relationships with valve manufacturers to meet our customers’ needs and increase serving capacity. Contact us today to learn more about our valve accessories and other products.
GORE MAITRAYEE
·
Follow
5 min read
·
Nov 18, 2022
--
The most typical device used to control fluid flow in a process is a control valve.
The control valve is a power-operated device that regulates the flow rate of a fluid in a process control system, according to the International Society of Automation.
If a control valve has the right accessories, it will function more smoothly and effectively and be more valuable for process control.
The following list shows the most commonly used accessories with the control valve, as per the requirements.
The vital part of a process control system, pneumatic control valve accessories help to ensure optimal operation.
A converter module is used in a current to pressure device to convert a 4 to 20 mA current input to a proportionate output of 3 to 15 psi pressure.
When a positioner’s high level of positioning accuracy is not necessary for some applications. Only an electro-pneumatic (I/P) transducer can be used in these situations.
When the actuator volume is very large, the control valve positioning reaction speed slows down.
Volume boosters are used to increase a valve assembly’s capacity for pneumatic thrust output. One volume booster is often used by single-acting actuators. At least two volume boosters are necessary for double-acting actuators.
A position transmitter’s main function is to give the control system independent, separate feedback on the position of each valve. As the control valve is used for process monitoring, troubleshooting, or startup/shutdown verification from the control room by an operator, position feedback of the control valve frequently becomes necessary.
The position transmitter, which measures the position of the valve stem or shaft, is directly mounted to the valve yoke.
To lock the valve in its current position in some situations, the solenoid valve will trap air in the actuator. To enable the valve to shift to its no air position in some situations, the solenoid valve will vent out the air from the actuator.
When the valve reaches a particular location within its range of motion, a limit switch is used to deliver a discrete open or discrete close input signal to the control system.
Limit switches located on the control valve and on the yoke can also be used by an operator in the control room for process monitoring, troubleshooting, or startup/shutdown verification.
Only specific feedback on valve position will be provided by these switches. According to our needs, these can be put on the control valve to provide extra feedback signals to the DCS or PLC systems.
In control applications where a specified actuator response is necessary in the event that the air supply pressure is interrupted, trip systems like air lock relays are used. These are utilized with single or double acting actuators to give pneumatic lock-up or with double acting actuators that do not have an inherent air failure condition.
The trip valve causes the actuator to fail up, lock the control valve in the last position, or fail down when the instrument air supply pressure drops below the trip point.
An air volume tank provides the reserve air capacity needed to operate the valve for double-acting applications in the event of an air supply breakdown and while the supply pressure is being restored. The trip valve automatically resets, turns normal, and permits the system to resume normal operation once the air supply pressure has increased above the trip point.
Adjustable travel stops are frequently utilized on the control valve’s handwheels for diaphragm actuators. In an emergency, they also offer a manual method of placing the control valve.
They are arranged in two ways to a control valve.
Travel in any direction can be restricted using the side-mounted handwheel, but not simultaneously in both directions. The control valve’s handwheel can be left in the neutral position to enable automatic operation for the duration of the whole valve movement.
For “infrequent service,” top-mounted handwheels are utilized to manually turn the valve.
There are five basic reasons that accessories are added to a control valve:
Since 1986, TVI has provided quality valves and accessories to customers around the world. We offer a range of specialized accessories for everything from petrochemicals to pharmaceuticals. With an extensive selection of plastic and metal valves and components, we have what you need for fluid flow optimization. Learn more about our valve accessories below or browse our catalog.
Actuators
A valve actuator is the mechanism used to open and close a valve. It can be operated manually through the use of a gear, wheel, or lever; however, actuators that require more force often use hydraulic, pneumatic, or electrical power. Actuators can be automated for industrial settings, which is also more efficient and allows remote operation. All actuators from TVI are mounted and tested to ensure optimal operation. Our heavy-duty designs ensure reliable operation and long-term stability.
Stem Extensions
Valves are controlled through manipulation of valve stems, and a valve stem extension allows for buried valves to operate above ground level. This creates simple access to the valve without having to implement a more arduous solution such as valve pits, man holes, and other alternatives.
Manual Gears
Manual valves are often used to regulate the flow of liquid or gas within a system. In a gear-operated valve, a manually operated wheel or lever is connected to a gear. When the gear turns, it moves a valve disc, which controls the fluid flow. Manual gear valves offer a high level of control and accuracy. Our durable design is made of corrosion-resistant materials that can withstand a broad range of temperatures.
Threaded Lugs
Lug-style butterfly valves used in dead-end service generally have a reduced pressure rating. Lug-style valves are unique because both sides of the valve’s body have threaded inserts – which can be adapted for all types of liquid and constraint.
304 & 316 ss available
Corrosion-resistant
Dead-end service
Easy to Install
Locking Devices
Valve locking devices include butterfly valves, ball valves, and sluice valves. They prevent valves from opening during system repairs and maintenance, which helps to ensure worker safety. TVI’s valve locking devices incorporate durable, corrosion-resistant designs with an easy-to-use color display. We make our devices easy to install to reduce overhead and keep your operation running smoothly.
Valve Flanges
Valve flanges use bolts, gaskets, and other connectors to seal pipes, valves, and other fluid system components together. Although they may be welded together, removable flange hardware allows for easy maintenance, repair, cleaning, and inspection. TVI offers a wide range of corrosion- and temperature-resistant valve flanges with an exceptionally high degree of design accuracy and durability.
Valve Fasteners
Valve fasteners are the hardware used to connect components at joints in a fluid system. Common valve fasteners include screws, nuts and bolts, and wing nuts. TVI provides a range of valve fasteners in a variety of materials, including metal alloys, PVC, PP, and PVDF. Our valve cover fasteners are easy to use and inexpensive, with a compact, sturdy design and long service life.
Superior Valve Solutions From TVI
For more than three decades, customers have relied on TVI to provide superior fluid control systems and accessories. We continuously expand our relationships with valve manufacturers to meet our customers’ needs and increase serving capacity. Contact us today to learn more about our valve accessories and other products.