The VPR 34100 HFI High-Temperature Butterfly Valve (Part Number / Model: VPR 34100 HFI - High temperature = 900°C) engineered and manufactured by premier French industrial valve maker Automatic Valve Réalisation (AUTOMATIC VALVE S.A.S. - France) is a specialized thermal regulation valve designed for extreme-heat furnace applications up to 900°C (and up to 1050°C with specialized refractory alloys). It combines an insulated bonnet extension with a rolling diaphragm pneumatic actuator and manual handwheel override.

PRODUCT OVERVIEW & SPECIFICATIONS (VPR 34100 HFI):
- Model Designation: VPR 34100 HFI (Vanne Papillon Régulatrice - Haute Température Isotherme avec Commande Manuelle).
- Manufacturer: Automatic Valve Réalisation (France).
- Isothermal Insulated Bonnet Extension: Features an extended cast bonnet with integrated thermal dissipation ribs and heat shielding, drastically reducing conductive and radiative heat transfer from the 900°C process stream to the packing box and actuation assembly.
- Hand Actuation Integration: Equipped with an integral geared handwheel override, enabling safe and effortless manual positioning by technicians directly at the valve station, even during peak thermal runs.
- Thermal Expansion Anti-Jamming Engineering: High-grade heat-resistant alloy disc and precision-calculated thermal clearances eliminate mechanical galling or disc binding caused by thermal expansion at 900°C.

KEY ADVANTAGES:
- Continuous Operation up to 900°C: Specifically tailored for demanding flue gas applications in thermal incinerators, clinker kilns, and steel reheating furnaces.
- Comprehensive Actuator Protection: Thermal isolation prevents thermal degradation of actuator diaphragm elastomers and positioner electronics.
- Live-Loaded High-Temperature Packing: Features multi-ring graphite packing energized by Belleville spring washers to maintain positive sealing integrity without manual retightening.

• Manufacturer: Automatic Valve Réalisation (AUTOMATIC VALVE S.A.S.)
• Origin: France
• Valve Series: VPR 34100 HFI (Belonging to 34100 / 34102 SERIES)
• Valve Type: High-Temperature Insulated Butterfly Valve with Hand Actuation
• Rated Operating Temperature: Up to 900°C (capable of reaching +1050°C with high-nickel alloys)
• Bonnet Construction: Isothermal / Insulated extended bonnet design
• Actuation Package: Rolling diaphragm pneumatic actuator + Integrated geared handwheel manual override
• Nominal Diameters: DN65 to DN1300 (ND65 - ND1300 mm / 2-1/2" to 52")
• Mounting Style: Wafer-type design for clamping between flanges (PN6, PN10, PN16, PN20, or ANSI 150 lbs)
• Control Characteristic: Approximately Equal Percentage
• Seat Leakage Class: Class II (34100) or Class III (34102 with metal stops) per ANSI/FCI 70-2
• Body & Disc Materials: High-temperature heat-resistant alloy steel or Austenitic stainless steel (e.g., AISI 310 / 314 or Inconel)
• Stem Packing: High-temperature live-loaded graphite stuffing box with Belleville spring compensation
• Instrument Air Supply: 2.0 to 6.0 bar
• Control Input Signals: 4-20 mA / 0.2-1.0 bar (with optional electro-pneumatic positioner)
• Actuator Interface: Standardized ISO 5211 mounting pad
• Typical Applications: Cement plant 900°C preheater bypass dampers, steel blast furnace hot gas control, hazardous waste incinerators, regenerative thermal oxidizers (RTO), and gas turbine high-temperature exhaust stacks.