Specification

TIANYU DN400 PN16 WCB Bidirectional Pressure-Bearing Triple Eccentric Metal Multi-Layer Hard Seal Wafer Butterfly Valve for Industrial Medium-Pressure Systems

I. Product Overview

TIANYU DN400 PN16 WCB bidirectional pressure-bearing triple eccentric metal multi-layer hard seal wafer butterfly valve is a high-performance industrial valve engineered for precise flow control in medium-pressure pipeline systems. Constructed with WCB cast carbon steel (renowned for robust mechanical properties and temperature resistance), this valve integrates a triple eccentric design and metal multi-layer hard sealing. Optimized for diverse media (water, steam, oil, mildly corrosive fluids), its wafer connection enables compact pipeline integration. The triple eccentric structure, combined with bidirectional pressure-bearing and multi-layer hard sealing, ensures tight shutoff, minimal wear, and extended service life—critical for reliable industrial operations. Whether in power plants, petrochemical facilities, or municipal networks, it adapts seamlessly to varying conditions.

II. Key Attributes and Specification Parameters

Basic Attributes

Structure Design: Triple eccentric (offsets for valve shaft, disc sealing surface, body sealing surface). Allows the disc to lift off the seat during operation (minimizing friction/wear) and form a “wedge-like” tight seal when closing—ideal for high-pressure, hard-sealed scenarios.
Body Material: WCB cast carbon steel. Offers high tensile strength, good impact resistance, and suitability for temperatures up to 425℃, balancing durability and cost for medium-pressure systems.
Disc & Seat Materials:
- Disc: Carbon steel with hard alloy (e.g., Stellite) overlay welding on the sealing surface (enhances wear, erosion, and high-temperature resistance).
- Seat: Precision-machined metal ring (stainless steel/alloy steel) with multi-layer sealing edges, mating with the disc’s hard alloy surface for reliable metal-to-metal sealing.
Pressure Rating: PN16 (1.6MPa), suitable for medium-pressure pipelines (steam distribution, oil transfer, high-pressure water systems).
Nominal Diameter: DN400 (16”), catering to large-diameter, high-flow applications (e.g., power plant cooling water, urban water mains).
Temperature Range: -29℃ to 425℃, operating reliably in low-temperature (chilled water) and medium-high temperature (saturated steam, hot oil) environments.
Media Compatibility: Versatile for clean water, raw water, sewage, saturated steam, crude oil, refined petroleum, natural gas, and mildly corrosive fluids (pH 5–9).
Connection Type: Wafer (double flange) connection, conforming to PN16 standards (GB/T 9113, ASME B16.5). Clamped between pipeline flanges for compact installation in space-constrained layouts.
Operation Modes: Supports manual (lever/gear), electric (motorized for remote/automated control), or pneumatic (air-driven for rapid response) drive methods.
Sealing Type: Metal multi-layer hard seal (ensures reliable shutoff in high-pressure, high-temperature, or abrasive media; multi-layer design boosts sealing stability).
Design Standards: Complies with API 609, GB/T 12238, ASME B16.34 (ensures global pipeline compatibility).

Product Overview

III. Product Features

Triple Eccentric Sealing Excellence: Triple eccentricity limits disc-seat contact to final closure, minimizing friction/wear. The “wedge effect” of eccentricities ensures tighter shutoff as the valve closes—critical for leak prevention in steam/oil systems.
Bidirectional Pressure-Bearing Capability: Withstands pressure from both flow directions, eliminating installation restrictions related to media flow orientation. Simplifies on-site installation and enhances versatility in reversible pipelines (e.g., variable-flow water networks).
Metal Multi-Layer Hard Seal Reliability: Multi-layer metal sealing (disc with hard alloy overlay, seat with precision multi-layer edges) delivers exceptional durability in harsh conditions. Resists wear from high-velocity flow, abrasion (sewage), and thermal cycling (steam systems).
Wafer Connection Compactness: Wafer design allows installation between existing flanges without extra length—ideal for retrofitting/upgrading space-constrained systems.
Robust Disc Design: Reinforced disc structure combines high strength with minimal flow resistance, ensuring efficient fluid transmission (reduces pumping energy) and resisting deformation under high pressure.
Corrosion Resistance: Valve body undergoes anti-corrosive treatment (e.g., epoxy coating) to form a protective layer against rust/environmental degradation—extending service life in outdoor/humid settings.
High-Temperature Tolerance: WCB cast steel and hard alloy seals retain mechanical properties up to 425℃—suitable for medium-pressure steam lines (power plants) or hot oil circuits (refineries).

IV. Manufacturing Process

Material Selection & Inspection: WCB cast steel undergoes rigorous testing (ASTM A216 compliance verified via chemical composition/mechanical tests). Disc/seat materials (alloy steels, hard alloys) are checked for hardness/wear resistance.
Precision Casting & Machining: Valve bodies/discs are precision-cast for dimensional accuracy. CNC machining refines flange surfaces, shaft holes, and sealing grooves (tight tolerances ensure proper triple eccentric alignment).
Sealing Surface Treatment: Disc sealing surfaces receive hard alloy (Stellite 6) overlay welding via submerged arc welding, followed by precision grinding/lapping for a mirror-like finish (ensures optimal metal-to-metal contact).
Assembly & Calibration: The disc is aligned with the valve shaft for accurate eccentricity. Wafer connection points are torqued to specification (uniform pressure distribution). Actuators (manual/electric/pneumatic) are calibrated for smooth 90° rotation with minimal backlash.
Testing & Quality Control: Each valve undergoes API 598-compliant testing:
- Shell test: 1.5×PN16 (verifies body integrity, no leakage/deformation).
- Seat test: 1.1×PN16 (confirms tight shutoff, leakage meets API 609 Class B).
- Operation test: Verifies smooth disc movement and shaft position indicator alignment.

Valve Details

V. Product Advantages

Exceptional Durability: WCB strength + multi-layer metal seals withstand cyclic operation, pressure fluctuations, and abrasion—extending service life to 10+ years in industrial environments.
Reliable Sealing Performance: Triple eccentric design + bidirectional pressure-bearing + multi-layer metal sealing ensure consistent shutoff after thousands of operations—reducing media loss in critical systems (steam pipelines, oil refineries).
Installation Efficiency: Wafer connection simplifies integration into existing pipelines (minimal space, reduced installation time). Bidirectional sealing eliminates flow direction constraints.
Broad Operational Versatility: Compatible with -29℃–425℃ temperatures and diverse media—eliminates need for specialized valves in mixed-media facilities.
Cost-Effective Performance: WCB balances durability and cost; low maintenance (replaceable seats, adjustable packing) reduces lifecycle expenses.
Global Standard Compliance: Adheres to API 609, GB/T 12238, ASME B16.34—facilitates multinational project integration.
User-Friendly Operation: Multiple drive options (manual/electric/pneumatic) cater to diverse needs (direct control, large/automated systems).

Application

VI. Product Applications

Power Generation: Deployed in steam distribution (boiler feedwater, condensate return), cooling water circuits—leveraging high-temperature tolerance and secure metal sealing.
Petroleum & Petrochemical: Used in crude oil gathering lines, refined product pipelines, hot oil/mildly corrosive chemical systems—multi-layer seals resist erosion, WCB withstands medium temperatures.
Municipal Water & Wastewater: Integrated into large-diameter water mains, sewage plants, irrigation systems—wafer connection simplifies maintenance, metal multi-layer seal handles abrasive sewage.
Chemical Industry: Suitable for neutral/mildly corrosive fluid lines (solvent transfer, process water)—metal multi-layer sealing ensures reliability in fluctuating pressure/temperature.
HVAC & Building Services: Used in large-scale heating/cooling pipelines (chilled/hot water)—electric actuation integrates with smart building automation.

TIANYU DN400 PN16 WCB bidirectional pressure-bearing triple eccentric metal multi-layer hard seal wafer butterfly valve excels in medium-pressure systems with steam, oil, or water. Its triple eccentric design, multi-layer hard seal, and bidirectional bearing ensure tight shutoff and durability. Ideal for power, petrochemical, and municipal sectors. Customizable (drive type, seal materials) to meet specific needs, backed by strict quality testing.