Hard seal butterfly valve

Product Overview

This Pneumatic Wafer Butterfly Valve (Standard Model: D671X Soft Seal, D673H Hard Seal) is a general-purpose industrial pipeline control valve with pneumatic automatic actuation as the core and ultra-thin wafer type valve body as the structural basis. Driven by the pneumatic actuator, the disc rotates 90° to quickly realize pipeline on-off and flow proportional regulation. It can be seamlessly connected to PLC/DCS industrial automatic control systems, featuring fast opening and closing, precise control, compact structure and minimal installation space occupation. It is a cost-effective preferred product for automatic control of low and medium pressure pipelines.

Available in full sizes DN25–DN1200 (NPS 1″–48″), it strictly complies with domestic and international general industrial valve standards including GB/T 12238, API 609, MSS SP-67 and ISO 5211. Widely used in low and medium pressure industrial and civil pipeline scenarios such as municipal water supply and drainage, HVAC, water treatment, petrochemical, electric power, metallurgy and light industry.

Key Features

1. Core Pneumatic Actuation System, Precise Automatic Control

   The product fully focuses on the core drive demand of pneumatic actuation, optimized for butterfly valve working conditions with full adaptability:

   1. Full type coverage: Standard equipped with AT/GT series rack and pinion quarter-turn pneumatic actuators, full coverage ofdouble acting (DA) / single acting spring return (SR, Fail Open / Fail Close, fail-safe type), suitable for 0.4-0.8MPa industrial clean compressed air, the fastest switching time is 0.5 seconds, perfectly suitable for frequent opening and closing and emergency shut-off working conditions;
      

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   2. Full control accessory adaptation: Standard equipped with NAMUR standard mounting interface, which can be seamlessly matched with explosion-proof solenoid valve, limit switch box, valve positioner, air filter regulator, emergency handwheel mechanism, realizing remote on-off control and 4-20mA analog flow proportional regulation, perfectly adapting to various industrial automatic control systems;
      

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   3. High protection & explosion-proof adaptation: Standard IP67 protection grade, optional IP68 waterproof and dustproof grade, ExdⅡBT4/CT4 explosion-proof grade, perfectly suitable for harsh industrial working conditions such as humid, dusty, flammable and explosive scenarios; built-in mechanical + electrical double limit, ±4° precise fine adjustment can be realized at 0° and 90° to ensure the switch is in place without over-travel, with accurate positioning without deviation;
      

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   4. Emergency operation guarantee: Optional manual handwheel is available, which can manually open and close the valve under air failure, signal interruption and equipment failure conditions, ensuring the safety of emergency pipeline operation.

   

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2. Core Wafer Type Ultra-Thin Valve Body, Space Saving & Easy Installation

   The product fully focuses on the core structural design of wafer type, which is the preferred solution for compact pipeline installation:

   1. The valve body adopts an integrated ultra-thin precision casting structure, with extremely short overall length and light weight, only 1/2 of the same diameter flanged butterfly valve, which greatly reduces the axial installation space, and is perfectly suitable for scenarios where conventional flanged valves cannot be installed, such as narrow spaces, dense pipelines, and built-in equipment;
      

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   2. The two ends of the valve body are equipped with flange positioning spigots, which can be accurately clamped between two standard flanges. During installation, only need to fasten 4 groups of through bolts diagonally to complete the fixation, which can be disassembled and assembled by a single person without disassembling the pipelines at both ends and hot work welding, greatly reducing the on-site construction and later maintenance costs;
      

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   3. The face to face dimension strictly complies with GB/T 12221, MSS SP-67 and API 609 standards, perfectly adapting to the world’s mainstream standard flanges such as GB, ANSI, JIS and DIN, no custom modification is required, with strong versatility.

   

3. Full Coverage of Dual Sealing Options, Zero Leakage Adaptation for Full Working Conditions

   Provide exclusive sealing solutions for different working conditions, covering most low and medium pressure application scenarios:

   1. Soft seal type (standard): Adopt EPDM/NBR nitrile rubber/PTFE seat, which is precisely fitted with stainless steel disc, the sealing grade reaches ANSI B16.104 Class VI bidirectional zero leakage, with small opening and closing torque, aging resistance and corrosion resistance, suitable for normal temperature clean water, sewage, air, oil and other conventional medium working conditions, the maximum applicable temperature is 180℃;
      

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   2. Hard seal type (optional): Adopt triple offset metal hard seal structure, the sealing surface of the seat and disc is overlaid with Stellite hard alloy, high temperature resistance, erosion resistance and anti-seizure, suitable for harsh working conditions such as high temperature steam ≤425℃ and media with trace particles, completely solving the pain points of soft seal such as easy aging and non-high temperature resistance.

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Applications

Product Summary