BONETTI Armaturen / Cesare Bonetti Industrial Valves and Level Gauges

Engineering selection and global supply of BONETTI Armaturen / Cesare Bonetti severe-service valves, high-pressure piping solutions, and precision level gauges.

Cesare Bonetti High-Performance Piston Valves

Cesare Bonetti piston valves handle severe thermal duties on superheated steam, gases, and harsh chemicals. Tight shutoff is achieved as a polished cylindrical piston strokes through resilient rings of alternating stainless steel and flexible graphite lamellae without seat wear.

Sizes from DN 10 to DN 200 (3/8" to 8") rated PN 16 to 63 and Class 150 to 800
Vibration-free stroke with complete piston shielding from erosive fluid velocity
Rapid inline repacking and servicing without cutting valve body from piping
Forged and cast steel, stainless steel, and ductile iron bodies with welded ends

BONT and CMI High-Pressure Gate, Globe and Check Valves

Heavy-duty BONT and CMI series valves are designed for supercritical steam piping, nuclear cooling, and hydrocracking units. Forged and cast steel bodies with pressure-seal bonnets and engineered Y-pattern angles ensure integrity at pressures up to 420 bar and temperatures to +650 °C.

Gate, globe, and swing/piston check valves rated from Class 150 up to Class 2500
High-pressure forged angle and Y-pattern valves Series WBY and bonnetless BLY
Cobalt-base hardfaced seating surfaces with Stellite for anti-galling durability
Engineered in accordance with API 600, API 602, ASME B16.34, and ISO standards

WVE Ball Valves and Cryogenic HTL Trunnion Mounted Series

Williams Valve Engineering (WVE) ball valves and the HTL trunnion series deliver Class VI shutoff across natural gas, LNG, and refining lines. Patented metal-graphite lamellar seats ensure resilient contact from cryogenic minus 196 degrees Celsius up to severe process heat of plus 550 degrees.

Bore sizes from 1/2" up to 48" in three-piece bolted and welded body executions
Patented lamellar stainless-steel and graphite seat rings for bubble-tight sealing
Extended bonnet cryogenic design conforming to BS 6364 for liquid gas operations
Fire-safe architecture to API 607 and antistatic stem protection to ISO 10497

Cesare Bonetti Zero-Emission Bellows Sealed Valves

Cesare Bonetti bellows sealed stop and control valves are designed for volatile organic compounds, hazardous gases, and thermal oils. A hydroformed multi-ply metal bellows creates an impenetrable barrier between process media and atmosphere, eliminating fugitive stem packing leakage.

Dual containment: hydroformed metal bellows rated over 10,000 cycles plus packing
Compliance with German TA-Luft air quality rules and fugitive emission standards
Flanged and welded bodies in carbon steel (WCB) and stainless steel (CF8M)
Critical service in synthetic thermal heat transfer loops, chlorine, and vacuum

Reflex, Transparent and Bi-Colour Glass Level Gauges

Cesare Bonetti direct-reading visual level indicators provide dependable monitoring for boiler drums, petrochemical vessels, and columns. Reflex models use prism grooves in borosilicate glass to contrast vapor and liquid, while bi-colour units feature LED illumination and protective mica.

Reflex and transparent glass indicators rated up to 250 bar and plus 400 degrees
Bi-colour indicators for power boilers showing clear red (steam) / green (water)
Toughened borosilicate glass to DIN 7081 with high-purity natural mica shields
Offset isolation valves with automatic safety ball checks against glass failure

Magnetic Level Gauges and Resistive Electronic Indicators RLG

Cesare Bonetti remote level instrumentation integrates MAG-TECH magnetic bypass chambers with RLG electronic conductivity-probe columns. The magnetic float coupling eliminates volatile leakage, while discrete conductivity probes deliver redundant boiler drum level inputs for automated DCS trips.

MAG-TECH magnetic gauges rated to 400 bar for hazardous and cryogenic fluid duties
Engineered titanium and 316L floats tailored for specific gravities down to 0.38
Continuous external transmitters providing 4–20 mA output and digital HART signal
RLG conductivity-probe electronic columns ensuring automated boiler safety trips

Manufacturing Heritage of Cesare Bonetti and Division Bonetti Armaturen Since 1905

Founded in 1905 by Cesare Bonetti in northern Italy, the enterprise has expanded over more than a century into an internationally acknowledged leader in the design and manufacture of high-integrity valves and liquid level instrumentation.

In 1926 the firm entered into a licensing agreement to produce specialized piston valves and direct-reading level gauges, creating the cornerstone of its proprietary mechanical engineering expertise. Its German subsidiary Bonetti Armaturen GmbH & Co.

KG supports plant engineering and power utilities throughout Central Europe, while the strategic acquisition of Williams Valves Engineering broadened its pipeline ball valve portfolio.

Engineering Design and Operating Principles of Bonetti Piston Valves Rated up to PN 63

The signature Cesare Bonetti piston valve line provides a dependable alternative to conventional globe valves that suffer from seat wire-drawing and disc erosion.

Fluid isolation is achieved by guiding a polished cylindrical stainless-steel piston through upper and lower resilient packing rings composed of interleaved stainless-steel sheets and expanded flexible graphite.

When the valve is stroked to the fully open position, the piston retracts entirely within the upper seal assembly, remaining shielded from abrasive particulate impingement and high-velocity steam cavitation.

Forged and Cast Heavy-Duty BONT and CMI Series Valves up to Class 2500

Engineered specifically for supercritical thermal power units, nuclear cooling systems, and hydroprocessing refineries, Cesare Bonetti supplies forged and heavy-cast steel gate, globe, and check valves under the BONT and CMI trademarks.

Fabricated from high-temperature carbon, chrome-moly, and austenitic stainless alloys, these units incorporate pressure-seal bonnets that leverage internal line pressure to compress the flexible metal seal ring, preventing flange leakage under severe thermal cycling.

All seating faces are plasma hardfaced with cobalt-base Stellite alloys.

Williams Valve Engineering (WVE) Pipeline Ball Valves and Cryogenic HTL Trunnion Series

The Williams Valve Engineering (WVE) product division and the HTL trunnion-mounted series address demanding requirements across natural gas pipelines, LNG terminals, and petrochemical processing units in sizes reaching 48 inches (DN 1200).

Series HTL ball valves feature a patented metal-graphite lamellar seat system guaranteeing bubble-tight Class VI shutoff across temperatures ranging from cryogenic minus 196 degrees Celsius to extreme process heat up to plus 550 degrees Celsius.

Extended bonnet executions are supplied for deep-refrigerated liquefaction plants in accordance with BS 6364 standards.

Direct-Reading Reflex, Transparent and Bi-Colour Glass Level Indicators up to 250 Bar

Cesare Bonetti visual liquid level indicators provide fail-safe physical verification for pressurized steam drums, chemical columns, and separator vessels at pressures up to 250 bar and temperatures reaching plus 400 degrees Celsius.

Reflex units employ longitudinal optical prisms in tempered borosilicate glass to generate high optical contrast between gaseous vapor and liquid phases.

Transparent and bi-colour models designed for power boilers incorporate external illuminators, distinguishing water and steam columns with green and red light paths while muscovite mica sheets shield glass from alkaline erosion.

MAG-TECH Magnetic Bypass Gauges and RLG Electronic Conductivity-Probe Systems

For continuous non-invasive level measurement of toxic, volatile, or cryogenic media, Bonetti provides MAG-TECH magnetic bypass indicator chambers.

The completely enclosed non-magnetic metallic chamber prevents toxic atmospheric release, while an external bi-colour magnetic roller bar tracks float movement through magnetic flux coupling.

For high-pressure power boiler drums, the firm provides RLG electronic resistivity indicator systems featuring discrete conductivity electrodes that initiate automated burner emergency cut-off upon low-water conditions.

BONETTI Armaturen / Cesare Bonetti and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of BONETTI Armaturen / Cesare Bonetti and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.