Level Gauges

Gauge glasses and level indicators are used for direct visual verification of level in steam boilers, pressure vessels, process tanks, and auxiliary water or condensate circuits. Type selection is based on operating pressure, temperature, process medium, installation geometry, visibility requirements, and the ability to isolate the indicator for maintenance.

Reflex gauges with ribbed glass are used where clear liquid–steam interface indication is required through differential light reflection. Transparent gauges are selected when full visual observation of the fluid is necessary, including inspection of color, foaming, turbidity, or suspended solids. The range includes Fival reflex and transparent designs, with flat or tubular glasses, as well as welded constructions for boiler house service and industrial tank applications.

For higher-pressure service, Fival gauge cocks type NX PN40 and NY PN100 are used to provide isolation, draining, and replacement of glass or gaskets without intervention on the main vessel. Available standards include DIN and ANSI, with flanged connection options, pressure classes PN 40 and Class 300, and stainless steel materials where compatibility with corrosive or treated water must be considered.

Fival magnetic level indicators and ADCA MLI units are applied where the indication system must remain mechanically isolated from the process fluid, reducing operator exposure to hot or pressurized media. For maintenance, spare borosilicate glasses to DIN 7081, cover gaskets, seals, and cock rings are used, as these components are critical for tight shut-off, visibility, and periodic inspection.

Level Indicators - Level Cock Gauge - 00000160 - Level Cock Gauge Type NX PN40 | Fival Srl | Philippopoulos s.a.

Level Indicators - Level Cock Gauge - 00000160 - Level Cock Gauge Type NX PN40 | Fival Srl

Level Indicators - Level Cock Gauge - 00000160 - Level Cock Gauge Type NX PN40 | Fival Srl
Fival Srl
Fival NX PN40 – Gauge Glass Isolation Valves for Level Indicators The Fival NX PN40 series comprises upper and lower isolation valves for visual level gauges on steam boilers, pressure vessels, and auxiliary water or condensate circuits. These valves enable isolation of the gauge glass from the vessel, safe draining of the column, and facilitate...
View
Level Indicators - Level Cock Gauge - 00000165 - Level Cock Gauge Type NY PN100 | Fival Srl | Philippopoulos s.a.

Level Indicators - Level Cock Gauge - 00000165 - Level Cock Gauge Type NY PN100 | Fival Srl

Level Indicators - Level Cock Gauge - 00000165 - Level Cock Gauge Type NY PN100 | Fival Srl
Fival Srl
Fival NY PN100 – Gauge Glass Isolation Cocks for Level Indicators Fival NY PN100 are upper and lower isolation cocks designed for gauge glass assemblies on steam boilers and pressure vessels. These valves enable isolation of the level column, safe draining of the gauge glass, and controlled intervention for glass, gasket, or packing replacement. The...
View
Level Indicator - Reflex Type - 00000142 - Reflex Level Gauge Mod. RBF NX - NY | Fival Srl | Philippopoulos s.a.

Level Indicator - Reflex Type - 00000142 - Reflex Level Gauge Mod. RBF NX - NY | Fival Srl

Level Indicator - Reflex Type - 00000142 - Reflex Level Gauge Mod. RBF NX - NY | Fival Srl
Fival Srl
Fival RBF NX / NY – Reflex Type Level Gauge The Fival RBF NX/NY is a reflex glass level gauge designed for direct visual indication of liquid level in boilers, pressure vessels, and industrial tanks. Indication is based on the refractive index difference between liquid and vapor phases: the liquid zone appears dark, while the vapor or gas zone appears...
View
Level Indicators - Reflex Type - 00000143 - Reflex Level Gauge Mod. RMF NX - NY | Fival Srl | Philippopoulos s.a.

Level Indicators - Reflex Type - 00000143 - Reflex Level Gauge Mod. RMF NX - NY | Fival Srl

Level Indicators - Reflex Type - 00000143 - Reflex Level Gauge Mod. RMF NX - NY | Fival Srl
Fival Srl
Fival RMF NX / NY – Reflex Multi-Section Level Gauge The Fival RMF NX/NY is a reflex-type visual level gauge designed for direct indication of liquid and vapor phases in pressure vessels, steam boilers, and process auxiliary circuits. The multi-section borosilicate glass construction is specified when a longer visible length is required than can be...
View
Level Indicators - Reflex Type - 00000144 - Reflex Level Gauge Mod. NX - NY | Fival Srl | Philippopoulos s.a.

Level Indicators - Reflex Type - 00000144 - Reflex Level Gauge Mod. NX - NY | Fival Srl

Level Indicators - Reflex Type - 00000144 - Reflex Level Gauge Mod. NX - NY | Fival Srl
Fival Srl
Fival RAF NX / NY – Reflex Level Gauge The Fival RAF NX/NY is an optical level gauge utilizing Reflex ribbed borosilicate glass for direct local indication of liquid level in boilers, pressure vessels, and auxiliary process lines. Indication is based on the differing optical properties of gas and liquid phases on the Reflex glass surface. Construction...
View
Level Indicators - Transparent Type - 00000145 - Tubolar Level Gauge Mod. BV-NX | Fival Srl | Philippopoulos s.a.

Level Indicators - Transparent Type - 00000145 - Tubolar Level Gauge Mod. BV-NX | Fival Srl

Level Indicators - Transparent Type - 00000145 - Tubolar Level Gauge Mod. BV-NX | Fival Srl
Fival Srl
Fival BV-NX – Tubular Level Gauge with Transparent Glass The Fival BV-NX is a local visual level indicator for liquids in tanks, auxiliary circuit vessels, and boiler plant installations. The liquid level is read directly through a borosilicate glass tube, requiring no electrical supply or signal converter. This product is referenced as a transparent...
View
Level Indicators - Transparent Type - 00000146 - Trasparent Level Gauge Mod. TMF NX | Fival Srl | Philippopoulos s.a.

Level Indicators - Transparent Type - 00000146 - Trasparent Level Gauge Mod. TMF NX | Fival Srl

Level Indicators - Transparent Type - 00000146 - Trasparent Level Gauge Mod. TMF NX | Fival Srl
Fival Srl
Fival TMF-NX – Transparent Level Gauge Indicator The Fival TMF-NX is a visual level gauge equipped with borosilicate transparent glasses, designed for direct local level indication on pressure vessels, steam boilers, condensate tanks, and auxiliary process circuits. The transparent construction allows direct observation of the process liquid through the...
View
Level Indicators - Transparent Type - 00000147 - Trasparent Level Gauge Mod. TAF NX - NY | Fival Srl | Philippopoulos s.a.

Level Indicators - Transparent Type - 00000147 - Trasparent Level Gauge Mod. TAF NX - NY | Fival Srl

Level Indicators - Transparent Type - 00000147 - Trasparent Level Gauge Mod. TAF NX - NY | Fival Srl
Fival Srl
Fival TAF NX / NY – Transparent Level Gauge Fival TAF NX/NY is a transparent glass level gauge designed for local visual monitoring of liquid levels in pressure vessels, steam boilers, condensate tanks, and auxiliary process circuits. The transparent construction allows direct observation of the liquid column, which is essential for level verification as...
View
Level Indicators - Transparent Type - 00000148 - Welded Level Guge Mod. TJF | Fival Srl | Philippopoulos s.a.

Level Indicators - Transparent Type - 00000148 - Welded Level Guge Mod. TJF | Fival Srl

Level Indicators - Transparent Type - 00000148 - Welded Level Guge Mod. TJF | Fival Srl
Fival Srl
Fival TJF – Transparent Welded Level Gauge The Fival TJF is a transparent type welded level gauge designed for direct mounting on vessel or boiler walls. It is specified where an external level column with isolating valves is not required, providing local visual indication directly on the equipment shell. The technical drawing refers to this unit as...
View
Level Indicators - 00000155 - Flameproof & Watertight Illumination Lamp - E50W | Fival Srl | Philippopoulos s.a.

Level Indicators - 00000155 - Flameproof & Watertight Illumination Lamp - E50W | Fival Srl

Level Indicators - 00000155 - Flameproof & Watertight Illumination Lamp - E50W | Fival Srl
Fival Srl
Fival E50W – Explosion-Proof and Watertight Luminaire for Level Gauge Applications The Fival E50W is an auxiliary lighting unit designed for transparent level gauges in process environments where low ambient light, restricted access, or boiler house conditions impede direct level reading. The luminaire mounts onto the gauge’s light diffuser and does not...
View
Level Indicators - Reflex Type - 00000166 - Welded Level Gauge Mod. RJF | Fival Srl | Philippopoulos s.a.

Level Indicators - Reflex Type - 00000166 - Welded Level Gauge Mod. RJF | Fival Srl

Level Indicators - Reflex Type - 00000166 - Welded Level Gauge Mod. RJF | Fival Srl
Fival Srl
Fival RJF – Welded Reflex Level Gauge Fival RJF is a welded reflex level gauge with prismatic Reflex borosilicate glass, designed for direct local level indication on vessel, boiler, or tank walls. It does not use an external column with isolating valves but is mechanically integrated into the equipment shell. The technical drawing refers to it as REFLEX...
View
Level Indicators - Reflex Type - 00000167 - R borosilcate gauges | Fival Srl | Philippopoulos s.a.

Level Indicators - Reflex Type - 00000167 - R borosilcate gauges | Fival Srl

Level Indicators - Reflex Type - 00000167 - R borosilcate gauges | Fival Srl
Fival Srl
Fival R01 – Reflex Borosilicate Gauge Glass, Ribbed Type The Fival R01 is a ribbed borosilicate glass spare part for Reflex-type level gauges. It is not a complete sight glass assembly; it serves as the optical element installed in the gauge chamber, enabling direct visual indication of liquid and vapor phases. Operating Principle The Reflex surface...
View
Level Indicators - Transparent Type - 00000168 - T Borosilicate Gauges | Fival Srl | Philippopoulos s.a.

Level Indicators - Transparent Type - 00000168 - T Borosilicate Gauges | Fival Srl

Level Indicators - Transparent Type - 00000168 - T Borosilicate Gauges | Fival Srl
Fival Srl
Fival T01 – Borosilicate Transparent Glass for Level Gauges The Fival T01 is a borosilicate transparent glass spare part for visual level gauges. It is not a complete gauge assembly; it is the glass element installed in transparent level gauges for direct observation of the liquid column. The T01 is intended for replacement in existing gauge bodies and is...
View
Level Indicators - Magnetic level gauge - 00000177 - Magnetic Level Gauge | Fival Srl | Philippopoulos s.a.

Level Indicators - Magnetic level gauge - 00000177 - Magnetic Level Gauge | Fival Srl

Level Indicators - Magnetic level gauge - 00000177 - Magnetic Level Gauge | Fival Srl
Fival Srl
Fival Magnetic Level Gauge – Magnetic Level Indicator The Fival magnetic level gauge is designed for local level indication in tanks, vessels, and boiler circuits where direct contact between operator and process fluid is undesirable. The assembly consists of an external float chamber, a magnet-equipped float, and a side-mounted bi-color indicator with...
View
Level Indicators Magnetic - MLI | ADCA | Philippopoulos s.a.

Level Indicators Magnetic - MLI | ADCA

Level Indicators Magnetic - MLI | ADCA
Valsteam ADCA
ADCA MLI – Magnetic Level Indicator The ADCA MLI is a bypass-type magnetic level indicator designed for continuous local level indication or level control in ADCA ECRU units, skid packages, condensate vessels, and industrial tanks. The process fluid is contained within a metallic chamber rather than a glass tube, reducing potential leakage points compared...
View
Level Indicators - Level Cock Gauge - 00000159 - Packing Sleeves | Fival Srl | Philippopoulos s.a.

Level Indicators - Level Cock Gauge - 00000159 - Packing Sleeves | Fival Srl

Level Indicators - Level Cock Gauge - 00000159 - Packing Sleeves | Fival Srl
Fival Srl
Fival F16 – Replacement Packing Ring for Level Gauge Valves The Fival F16 is a replacement sealing ring designed for use in the gland assembly of level gauge valves. It provides controlled compression around moving or stationary stems, ensuring leak-tight operation for water, steam, or process fluids. The F16 is referenced as a replacement packing ring...
View
Borosilicate glass acc. to DIN 7081 | Noris | Philippopoulos s.a.

Borosilicate glass acc. to DIN 7081 | Noris

Borosilicate glass acc. to DIN 7081 | Noris
Noris Armaturen
NORIS DIN 7081 – Borosilicate Glass for Level Gauges NORIS glasses according to DIN 7081 are replacement borosilicate glass plates for visual level gauges in boilers, pressure vessels, and industrial liquid circuits. These are not complete gauge assemblies; selection is based on compatibility with existing gauge bodies, dimensional fit, gasket selection,...
View
Gaskets for sight glasees | Noris | Philippopoulos s.a.

Gaskets for sight glasees | Noris

Gaskets for sight glasees | Noris
Noris Armaturen
NORIS – Gaskets for Sight Glass Level Gauges NORIS gaskets are used in sight glass level gauges with glass plates, serving as sealing elements between the glass, gauge body, and cover. These are not level indication components but critical sealing spares that directly affect leakage, glass compression, and safe operation under steam or process liquid...
View