In-line Velocity Flow Switches
Last Updated: April 1, 2025
Description
In-line velocity flow switches are devices installed directly in the process line to monitor the flow of a fluid. They are designed to detect the velocity of the fluid passing through a pipe and provide a signal when the flow reaches a certain threshold. These switches are crucial for ensuring that the flow remains within desired parameters, helping to maintain system efficiency and safety.
Working Principle
In-line velocity flow switches operate by measuring the speed of the fluid flowing through a pipe. They typically use a sensor that detects changes in flow velocity and triggers an alarm or control action when the flow deviates from a setpoint. This functionality is particularly useful for preventing damage to equipment, such as pumps, by ensuring that they do not operate under conditions of insufficient flow. The switches are beneficial in maintaining optimal process conditions and preventing system failures.
Applications
In-line velocity flow switches are used in various applications where monitoring fluid flow is critical. For example, they are employed in cooling systems to ensure adequate fluid delivery to cooling towers, preventing overheating and equipment damage. They are also used in water treatment processes within oil and gas refineries to monitor and control the flow of water, ensuring efficient operation and compliance with environmental regulations.
Advantages over other Materials - Plastics and Polymers
In-line velocity flow switches made from materials like brass or bronze offer advantages over plastics and polymers, particularly in applications involving water systems. Brass and bronze are resistant to corrosion, rusting, and breakdown, making them suitable for environments where durability and longevity are critical. In contrast, plastics, while lightweight and resistant to rust, may not perform well in extreme temperature conditions, such as freezing or high heat, where they can become brittle or deform.
Limitations
One limitation of in-line velocity flow switches is their sensitivity to wear and corrosion, especially in mechanical designs like paddle switches. Additionally, ultrasonic flow switches, which are a type of in-line switch, may experience reduced accuracy at low flow rates and can be affected by pitting or fouling of the pipe, which can alter flow readings.
Considerations
When selecting in-line velocity flow switches, several factors should be considered. Initial costs can vary depending on the material and design of the switch. Operating expenses may include energy consumption and potential downtime for maintenance. Durability is a key consideration, as switches made from robust materials like brass or bronze tend to have longer lifespans. Accuracy is crucial for ensuring reliable flow monitoring, and maintenance costs should be factored in, as regular checks and potential replacements may be necessary to maintain optimal performance.
from Fluid Components Intl. (FCI)
The FS10i is a universal flow switch and flow monitor designed for simple insertion into ½ ” (13mm) or larger diameter pipes and square ducts. The unit is suitable for either liquid or air/gas applications. It is fast responding and highly repeatable to both increasing and decreasing... [See More]
- Mounting: In-line
- Pipe Diameter: 0.25 to 0.50
- Meter Technology: Thermal
- End Fittings: In-line Threaded
from OMEGA Engineering, Inc.
The FSW-9000 Series is a flow switch monitor that measures the velocity of the flow. It is ideal for use in measurement and control liquid applications. The FSW-9000 Series provides two output options: a 4 to 20mA analog output and a PNP/NPN output. For the 4 to 20 mA output, the electronics ’... [See More]
- Mounting: In-line
- End Fittings: In-line Threaded
- Pipe Diameter: 0.50 to 0.75
- Process Media Type: Liquid
from Litre Meter Limited
Extended linearity electromagnetic flowmeter with PTFE liner designed for wafer fitting between flanges. 25mm to 300mm [See More]
- Mounting: In-line
- Pipe Diameter: 0.98 to 11.81
- Meter Technology: Electromagnetic; Sonar; Turbine; Ultrasonic; Vortex (Shedding) Meter
- End Fittings: In-line Flanged
from KOBOLD Instruments, Inc.
Product Features. Flow Range 0.26-5.3 GPM Water. Bearingless Turbine Design for Long Life. All Plastic Wetted Parts. Accuracy ±1% of Reading. High precision at affordable pricing is the primary feature of KOBOLD's SFL turbine flow sensor. A bearingless design provides very high reliability. [See More]
- Mounting: In-line
- End Fittings: In-line Threaded
- Meter Technology: Turbine
- Process Media Type: Liquid
from Bionetics
Rheotherm flow switches provide reliable switch protection in all types of liquid or gas service. From critical monitoring of extremely low flow process additives to loss of flow protection in large water or air lines, we can handle most flow switch applications. With no moving parts, long term... [See More]
- Mounting: In-line; Insertion
- Pipe Diameter: 0.06 to 1.00
- Meter Technology: Thermal
- End Fittings: In-line Flanged (optional feature); In-line Threaded (optional feature); Tube End/Hose Nipple (optional feature); Sanitary
from KOBOLD Instruments, Inc.
Product Features. Available Materials of Construction Include Stainless Steel, Hastelloy C22, Polypropylene and PTFE. Line Sizes from 2 to 24 Inches. Can Be Supplied for Horizontal or Vertical Piping Runs. Variable Flap Measuring Technique Yields Very Low Head Loss. Excellent Tolerance to Dirty... [See More]
- Mounting: In-line
- End Fittings: In-line Flanged
- Meter Technology: Variable Area
- Process Media Type: Liquid