The 34102 SERIES Industrial Control Butterfly Valves (including standard variants such as VPR 34102 CF, VPR 34102 HF, and VPS 34102 HF) manufactured by premier French industrial valve maker Automatic Valve Réalisation (AUTOMATIC VALVE S.A.S. - France) are heavy-duty wafer control valves designed for demanding flow modulation where enhanced shut-off tightness is required. Built on the proven architecture of the 34 100 series, the 34 102 incorporates integral internal metal stops to significantly lower seat leakage rates.

PRODUCT OVERVIEW & SPECIFICATIONS (34102 SERIES):
- Product Series: 34 102 Series (High-Tightness Control Butterfly Valves).
- Manufacturer: Automatic Valve Réalisation (France).
- Nominal Size Range: Available from DN65 (ND 65 mm / 2-1/2") up to DN1300 (ND 1300 mm / 52"), accommodating large industrial air ducts and process lines.
- Improved Relative Tightness (Metal Stops): Integrates precision-machined mechanical metal stops inside the valve body, elevating seat sealing capability to Leakage Class III per ANSI/FCI 70-2. Seat leakage upon closure is reduced to just 0.1% of Cv in cold versions and 0.2% of Cv in hot versions (substantially tighter than the 0.5% - 1% Class II limit of the 34 100 series).
- Aerodynamic Disc Design: Straight butterfly disc geometry with high-precision CNC machining or integrated turbulators to linearize flow behavior into an approximately equal percentage flow characteristic.
- Anti-Jamming High-Temperature Precision: Precision tolerances engineered between disc and body prevent thermal binding or mechanical jamming at extreme furnace temperatures up to 900°C - 1050°C.
- Standardized Actuation Interface: Equipped with top mounting pads compliant with ISO 5211, enabling direct integration of long-stroke rolling diaphragm pneumatic actuators (VPR series) or industrial electric rotary actuators.

KEY ADVANTAGES:
- ANSI/FCI 70-2 Class III Tightness: Delivers an ideal compromise between precise flow modulation and enhanced shut-off capability without requiring soft elastomer inserts in hot zones.
- Extraordinary Thermal Range: Available in cold or hot configurations, designed to endure severe temperature cycles between -50°C and +1050°C without mechanical distortion.
- Self-Compensating Shaft Packing: Features a live-loaded stuffing box energized by constant-tightening spring washers, ensuring dependable stem sealing over long service intervals without routine repacking.
- Superior Mechanical Endurance: Tested to exceed 1,000,000 operational cycles in sequential service without requiring valve maintenance under normal operating conditions.

• Manufacturer: Automatic Valve Réalisation (AUTOMATIC VALVE S.A.S.)
• Origin: France
• Valve Series: 34102 SERIES (VPR / VPS 34102)
• Valve Type: High-Tightness Industrial Control Butterfly Valve
• Nominal Diameters: DN65 to DN1300 (ND65 - ND1300 mm / 2-1/2" to 52")
• Mounting Style: Wafer-type design for clamping between pipe flanges (NP6, NP10, NP16, NP20, or ANSI 150 lbs)
• Sealing Mechanism: Precision machined internal metal stops in valve body
• Seat Leakage Class: Class III according to ANSI/FCI 70-2
  - Cold Version: 0.1% of total Cv
  - Hot Version: 0.2% of total Cv
• Control Characteristic: Approximately Equal Percentage
• Operating Temperature Range: -50°C to +900°C (up to +1050°C with high-nickel alloy execution)
• Body & Disc Materials: Carbon steel, cast alloy steel, or high-temperature stainless steel grades
• Shaft Packing: High-temperature graphite packing gland with constant-tightening Belleville spring washers
• Actuation Options:
  - Long-stroke pneumatic actuator with rolling diaphragm
  - Industrial quarter-turn electric actuator
  - Manual hand lever or worm gearbox
• Actuator Mounting Interface: Standardized ISO 5211 flange
• Mechanical Operating Endurance: > 1,000,000 maintenance-free operating cycles
• Typical Applications: Cement plant exhaust gas dampers, hot blast control in steel mills, boiler combustion air regulation, gas turbine exhaust bypass, and industrial incinerator ducting.