Flanged Sight Flow Indicators
Last Updated: April 1, 2025
Description
Flanged Sight Flow Indicators are devices used to provide a visual indication of the flow of liquids through a pipeline. They are equipped with flanges that allow them to be easily integrated into piping systems. These indicators typically feature a transparent section through which the flow of the liquid can be observed, allowing operators to verify the presence and direction of flow.
Working Principle
Flanged Sight Flow Indicators operate by incorporating visual indicators such as flappers, propellers, or rotors within a transparent section of the pipeline. As the fluid flows through the pipeline, these indicators move, providing a visual confirmation of flow. The movement of these indicators is directly related to the flow rate and direction, making them useful for monitoring and verifying fluid flow in real-time. They are particularly beneficial in systems where visual confirmation of flow is critical for operational safety and efficiency.
Applications
Flanged Sight Flow Indicators are used in a variety of applications. For instance, they are employed in soil remediation systems to visually confirm the presence of flow by observing streamers within the chamber. They are also used downstream of injection systems to verify the presence of process additives. These indicators are suitable for use with clear, translucent, or dark fluids, making them versatile for different industrial processes.
Advantages over other Sight Flow Indicators
One of the advantages of Flanged Sight Flow Indicators is their ability to handle high pressures and provide easy, dependable on-site flow monitoring without the need for a power supply. They are also designed to minimize pressure loss and can be used with a variety of fluids, including liquids, gases, and steam. Their rugged construction and availability in various materials make them suitable for a wide range of applications.
Limitations
Flanged Sight Flow Indicators have certain limitations. Their measuring accuracy can be affected by process conditions and fluid properties. They are not suitable for media that could coat the measuring tube or interfere with the sight glass, and they require fluid-specific calibration. Additionally, they are not ideal for liquids containing solids, as entrained matter can affect their performance.
Considerations
When considering Flanged Sight Flow Indicators, it is important to evaluate factors such as initial costs, operating expenses, durability, and maintenance requirements. These indicators are generally low-cost and do not require a power supply, which can reduce operating expenses. However, their accuracy and performance depend on the specific fluid and process conditions, which may necessitate regular maintenance and calibration. Durability is enhanced by selecting appropriate materials for the body, seals, and windows based on the application, ensuring long-term reliability and reduced replacement costs.
from Plast-O-Matic Valves, Inc.
Series GX Single-wall sight glass for liquids compatible with acrylic. 1/2 ″ – 3 ″ sizes, NPT or socket connections in PVC or polypro. Fluttering streamers optional. Series GY Double-wall sight glass for liquids compatible with Pyrex inner wall. 1/2 ″ – 3 ″ sizes,... [See More]
- Connection Type: Flanged
- Flange Size: 1.5
- Flow Indicator Style:: Full View
- Length (Face to Face): 4.5
from Clark Solutions
DG11 sight glasses are used to visually monitor the flow of liquids in pipe systems. Depending on the type of liquid and flow volume, these devices are used with a fully clear bore or with a flap or rotor (for transparent liquids). DG11 sight flow indicator permits reliable monitoring of the... [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 10
- Flow Indicator Style:: Flapper (optional feature); Rotor (optional feature)
- Length (Face to Face): 5.12 to 28.74
from Armstrong International
Flow indicators for refrigeration service provide a quick, reliable and economical way to verify the flow of refrigerant in refrigeration systems. Features: Refrigerants: Suitable for all common refrigerants including R-717 (Ammonia), R-134a, R-22 and other approved refrigerants. It is also used in... [See More]
- Connection Type: Flanged; Butt Weld
- Flange Size: 1 to 2
- Flow Indicator Style:: Plain
- Thread Size: 1 to 2
from LJ Star
A flow indicator designed to be mounted in-line for high purity applications to provide operators with a clear view of flow of virtually any process pipeline fluid or powder. The sterile-designed flow indicator features an internal-flush style that meets FDA specifications, based on a unique O-ring... [See More]
- Connection Type: Flanged
- Flange Size: 0.3750 to 4
- Flow Indicator Style:: Plain; Full View; Armored
- Pressure Range: 150
from JOGLER, Inc.
Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Unobstructed visibility. Patented one-piece SuperSeal Inserts are self-sealing. Wetted parts are PTFE Teflon ® and borosilicate glass. Available with sanitary fittings. Threaded end... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1 to 8
- Flow Indicator Style:: Armored
- Length (Face to Face): 8 to 12
from G.I.E. Inc.
Fabricated steel body, pressure rating available to 300psi [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 8
- Flow Indicator Style:: Plain
- Length (Face to Face): 7 to 18
from OPW Engineered Systems
OPW has been manufacturing sight flow indicators for over 60 years. Our experience has led to many innovations in design and manufacturing, making VISI-FLO ® the most thoroughly-engineered Sight Flow Indicator on the market. VISI-FLO ’s are available in two series: the Standard 1400... [See More]
- Connection Type: Flanged
- Flange Size: 0.7500 to 12
- Flow Indicator Style:: Flapper (optional feature); Rotor (optional feature); Drip Tube (optional feature)
- Pressure Range: 135 to 200
from Clark Solutions
Model series DG04 sight glasses are distinguished by their rugged construction and wide range of applications. They feature 0.94", 1.18", or 1.97" / 24, 30, or 50 mm long transparent cylinders made of acrylic, soda-lime, or borosilicate glass with very high wall thickness. These cylinders are... [See More]
- Connection Type: Flanged
- Flange Size: 0.5500 to 15
- Flow Indicator Style:: Full View
- Length (Face to Face): 0.3750 to 12
from LJ Star
Our Sterile Full-View Indicators feature polished stainless steel sanitary clamp connections are featured in the new Sterile Full-View Visual Flow Indicators, rated up to 150 psi. These competitively priced units use borosilicate glass cylinders and incorporate a number of other standard features... [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 6
- Flow Indicator Style:: Plain; Full View
- Pressure Range: 150
from JOGLER, Inc.
Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Unobstructed visibility. Patented one-piece SuperSeal inserts are self-sealing. Wetted part is one-piece PFA Teflon ®, flared over SuperSeal insert. Available with sanitary... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1 to 8
- Flow Indicator Style:: Armored
- Length (Face to Face): 8 to 12
from OPW Engineered Systems
OPW has been manufacturing sight flow indicators for over 60 years. Our experience has led to many innovations in design and manufacturing, making VISI-FLO ® the most thoroughly-engineered Sight Flow Indicator on the market. VISI-FLO ’s are available in two series: the Standard 1400... [See More]
- Connection Type: Flanged
- Flange Size: 0.7500 to 12
- Flow Indicator Style:: Flapper (optional feature); Rotor (optional feature); Drip Tube (optional feature)
- Pressure Range: 165 to 285
from LJ Star
A 360 ° full-view flow indicator with flanged connection, for pipe sizes ranging in size from 1/8 ″ to 4 ″. It is equipped with an impact-deterrent shield as standard. [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 4
- Flow Indicator Style:: Plain; Drip Tube (optional feature); Full View
- Pressure Range: 70 to 150
from JOGLER, Inc.
Model LAS Features. Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Full 360 degree unobstructed visibility. All-welded construction, flanges and support rods. Patented one-piece SuperSeal inserts are self-sealing. Wetted parts are... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1 to 8
- Flow Indicator Style:: Full View
- Length (Face to Face): 8 to 12
from LJ Star
he strongest, most secure glass elements available, Metaglas ® mechanically prestressed windows, are now available in a sanitary design visual flow indicator in processing applications. MetaClamp ® sanitary-service fittings. Described as offering the optics of glass and the strength of... [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 6
- Flow Indicator Style:: Plain
- Body Materials: Steel - Stainless
from JOGLER, Inc.
Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Full 360 degree unobstructed visibility. All-welded construction, flanges and support rods. Patented one-piece SuperSeal inserts are self-sealing. Wetted part is one-piece PFA Teflon... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1 to 8
- Flow Indicator Style:: Full View
- Length (Face to Face): 8 to 12
from LJ Star
The flanged version of our standard view-through flow indicator ranges from 1/2 ″ to 12 ″ is full-ANSI rated up to 6 ″. The quality investment-cast body is made from stainless or coated carbon steel. It is fitted with independently bolted glass retainers. To meet different... [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 8
- Flow Indicator Style:: Plain; Flapper (optional feature); Rotor (optional feature); Drip Tube (optional feature)
- Pressure Range: 150 to 300
from JOGLER, Inc.
Model FT Features. Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Unobstructed visibility. Patented one-piece SuperSeal inserts are self-sealing. Wetted parts are PTFE Teflon ® and borosilicate glass. Available with sanitary... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1.5 to 10
- Flow Indicator Style:: Armored
- Length (Face to Face): 8 to 12
from LJ Star
A flow indicator designed to handle a wide variety of common corrosive chemicals, the new lined LJ Star visual flow indicators are offered in both Teflon ® PFA and Tefzel ® models. These new flanged units provide clear viewing even at high pressures, and at temperatures up to 500 °. [See More]
- Connection Type: Flanged
- Flange Size: 0.5000 to 8
- Flow Indicator Style:: Plain
- Pressure Range: 150 to 300
from JOGLER, Inc.
Patented Tube-N-Tube design with patented PFA Teflon ® liner. Approved by the Factory Mutual System. Available in any length up to 72 inches. Stock lengths are 8 and 12 inches. Unobstructed visibility. Patented one-piece SuperSeal inserts are self-sealing. Wetted part is one-piece PFA Teflon... [See More]
- Connection Type: Threaded (optional feature); Flanged
- Flange Size: 1.5 to 10
- Flow Indicator Style:: Armored
- Length (Face to Face): 8 to 12