Specification

TIANYU DN80 PN16 Electric 3-Way Threaded Ball Valve for Gas Media: Customizable Flow Control Solution

I. Product Overview

TIANYU DN80 PN16 electric 3-way threaded ball valve is a specialized flow control device engineered for precise management of gas media in industrial and commercial systems. Combining the versatility of 3-way functionality with the convenience of electric actuation, this valve is crafted from high-grade stainless steel (304/316) to balance corrosion resistance, tight sealing, and adaptability. Designed to operate at 1.6MPa (PN16) and -20℃~150℃, it excels in both gas 分流 (diversion) and 合流 (convergence) applications—making it ideal for sectors like natural gas distribution, industrial gas processing, municipal 燃气 systems, and chemical gas handling. Its threaded connection simplifies installation in compact pipelines, while the electric actuator enables remote, automated control, enhancing efficiency in scenarios where manual operation is impractical or hazardous.

II. Key Attribute Specifications

Category	Details
Size	DN80 (3”), suitable for medium-flow gas pipelines requiring precise diversion or convergence.
Pressure Rating	PN16 (1.6MPa), compliant with low-to-medium pressure gas systems (e.g., natural gas, industrial inert gases).
Material Composition	– Valve Body & Ball: Stainless steel 304 (18Cr-8Ni) as standard; 316 (16Cr-10Ni-2Mo) optional for enhanced corrosion resistance in chloride-rich environments. – Sealing Material: PTFE (polytetrafluoroethylene) for general gas service; EPDM for water-gas mixtures; FKM for high-temperature gases (up to 150℃). – Stem & Threads: Stainless steel 304/316, with threads conforming to NPT/BSPT standards for secure connection.
Connection Type	Threaded (NPT/BSPT), with precision-machined threads for leak-tight assembly. Compatible with standard threaded pipes and fittings, eliminating the need for flanges in compact spaces.
Actuation Parameters	– Electric Actuator: DC24V/AC220V (customizable to AC110V), supporting on-off control (full open/close) or modulating control (0-100% flow adjustment via 4-20mA signal). – Protection Class: IP65, resisting dust and water ingress in outdoor or damp environments. – Operation Time: 90° rotation in 5-10 seconds, enabling rapid response to gas flow demands.
3-Way Structure	Available in L-type (diversion: one inlet to two outlets) or T-type (convergence: two inlets to one outlet), customizable based on system requirements.
Temperature Range	-20℃~150℃ (PTFE seal limit); up to 200℃ with FKM seals, suitable for heated gases (e.g., industrial process gases).
Performance Metrics	– Leakage Class: ANSI/FCI Class VI (bubble-tight for gases), ensuring ≤0.1×DN mm³/min leakage under test pressure. – Cycle Life: ≥50,000 operations with consistent sealing performance. – Gas Compatibility: Suitable for natural gas, LPG, nitrogen, oxygen (degreased version), and inert gases.

Product Overview

III. Feature Description

A. 3-Way Functionality for Diversion & Convergence

The valve’s core advantage lies in its 3-way design, which integrates three ports (A, B, C) to enable two critical functions: L-type diversion (directing gas from port A to B or A to C) and T-type convergence (mixing gas from A and B into C). This eliminates the need for multiple 2-way valves in gas distribution systems—for example, in a natural gas network, it can divert gas from a main line to either a residential supply or an industrial branch, simplifying pipeline design and reducing installation costs. The ball’s precision-machined flow paths ensure minimal pressure drop (≤0.05MPa at rated flow), preserving gas system efficiency.

B. Electric Actuation for Automated Control

Equipped with a compact electric actuator, the valve supports remote operation via control signals, making it ideal for unmanned gas stations or industrial plants with centralized control systems. The actuator’s on-off mode enables quick shut-off in emergencies (e.g., gas leak detection), while modulating control allows fine-tuning of gas flow rates—critical for processes like gas mixing in chemical plants, where precise ratios of inert and reactive gases are required. A manual override function ensures operability during power outages, enhancing reliability in safety-critical applications.

C. Threaded Connection for Compact Installation

Unlike flanged valves, the threaded design allows installation in tight spaces (e.g., wall-mounted gas meters, confined machinery). Precision-machined NPT/BSPT threads create a metal-to-seal connection when paired with thread sealant (e.g., PTFE tape), eliminating leakage risks common in poorly aligned flanged joints. This design also simplifies retrofitting into existing threaded pipelines, reducing downtime during upgrades—essential for municipal gas networks where service interruptions must be minimized.

D. Gas-Tight Sealing with PTFE/EPDM/FKM

The valve’s seat uses PTFE as standard, a material with low gas permeability and chemical inertness, ensuring bubble-tight sealing for non-aggressive gases (natural gas, nitrogen). For gas-water mixtures (e.g., humid industrial gases), EPDM seals offer superior elasticity and water resistance. In high-temperature scenarios (e.g., heated process gases), FKM seals maintain integrity up to 200℃, avoiding hardening or cracking that could cause leaks. The seat is mechanically retained to prevent displacement under gas pressure surges, a critical feature in fluctuating gas systems.

E. Stainless Steel Corrosion Resistance

Stainless steel 304/316 construction resists corrosion from moisture, mild acids, and chloride ions—key for gas systems where condensation or trace contaminants (e.g., hydrogen sulfide in natural gas) could degrade carbon steel valves. In coastal areas or industrial zones with high humidity, 316 stainless steel prevents pitting corrosion, extending valve service life to 10+ years. The ball’s smooth, polished surface (Ra ≤0.8μm) minimizes gas turbulence, reducing erosion and ensuring consistent flow characteristics.

IV. Manufacturing Processes

A. Material Preparation & Validation

Stainless Steel Sourcing: 304/316 billets are sourced from certified mills, with chemical composition verified via spectral analysis (e.g., 304: 18-20% Cr, 8-10.5% Ni) to ensure corrosion resistance.
Defect Detection: Billets undergo ultrasonic testing to identify internal flaws (porosity, cracks) that could compromise pressure integrity in gas service.

B. Precision Machining of Valve Components

Body & Threads: The valve body is CNC-turned to form the 3-way flow paths, with threads machined to NPT/BSPT standards (tolerance ±0.02mm) using thread rolling—enhancing thread strength and leak resistance compared to cutting.
Ball Fabrication: The 3-way ball is CNC-machined to create L-type or T-type flow channels, with surface grinding to achieve Ra ≤0.8μm. This ensures uniform contact with the seat, critical for gas tightness.
Stem Machining: The stem is precision-ground to fit the body’s packing chamber, with a keyway to connect securely to the actuator, ensuring torque transmission without slippage.

C. Sealing System Assembly

Seat Installation: PTFE/EPDM/FKM seats are compression-molded to match the ball’s contours, then press-fitted into the body’s seat pockets. Retaining rings prevent seat displacement under gas pressure.
Packing Assembly: Graphite-impregnated PTFE packing is wrapped around the stem to form a gas-tight seal, compressed to balance leak resistance and smooth stem rotation.

D. Electric Actuator Integration

Actuator Mounting: The electric actuator is bolted to the valve body via an ISO 5211 mounting pad, with the drive shaft connected to the valve stem via a spline coupling—ensuring precise alignment for 90° rotation.
Wiring & Calibration: Actuator wiring is tested for continuity, and control signals (4-20mA for modulating type) are calibrated to ensure flow rate corresponds linearly with valve rotation (e.g., 4mA = 0% open, 20mA = 100% open).

E. Performance & Safety Testing

Gas Leak Test: Under 1.1×PN16 (1.76MPa) nitrogen pressure, the valve undergoes bubble testing—no visible bubbles indicate ANSI/FCI Class VI compliance.
Hydrostatic Test: The body is pressurized to 1.5×PN16 (2.4MPa) with water for 30 minutes, verifying structural integrity.
Cycle Test: 10,000+ open-close cycles are performed with gas media to validate actuator reliability and seat durability, with torque measurements recorded to ensure consistent operation.
Thread Seal Test: Assembled with a threaded pipe fitting, the valve is pressurized to PN16 to confirm no leakage at the thread joint—critical for gas systems where even minor leaks pose safety risks.

Valve Details

V. Product Advantages

A. Simplified Gas System Design

The 3-way functionality eliminates the need for multiple 2-way valves, reducing pipeline complexity and potential leak points. In a commercial building’s gas system, for example, one valve can direct gas to either the kitchen or heating system, replacing two separate valves and lowering installation costs by 30%.

B. Gas-Tight Reliability

ANSI/FCI Class VI sealing ensures minimal gas leakage, complying with strict safety standards (e.g., EN 13758 for natural gas valves). This prevents hazardous gas accumulation in enclosed spaces and reduces product loss in industrial gas applications (e.g., high-purity nitrogen).

C. Remote Control for Safety & Efficiency

Electric actuation enables operation from a safe distance, reducing worker exposure to high-pressure gas lines. In industrial plants, integration with SCADA systems allows real-time monitoring of gas flow, enabling predictive maintenance and rapid response to anomalies (e.g., sudden pressure drops).

D. Corrosion Resistance for Longevity

Stainless steel 304/316 and chemical-resistant seals withstand harsh gas environments, including humid natural gas, chloride-rich industrial gases, and mildly acidic process gases. This reduces maintenance frequency—valves in municipal gas systems typically require inspection only every 5 years, versus 2-3 years for carbon steel alternatives.

E. Customization for Diverse Gas Needs

L-type/T-type configurations, material upgrades (316), and seal options (FKM for high temps) allow tailoring to specific gases. For oxygen service, a degreased version (free of oil/grease) prevents ignition risks, while inert gas systems benefit from 316’s resistance to trace contaminants.

Application

VI. Product Applications

A. Natural Gas Distribution

Residential/Commercial Supply: Diverts gas from main lines to appliances (stoves, boilers) or backup systems, with threaded connections fitting compact meter boxes.
Pressure Regulation Stations: Converges gas from high-pressure and low-pressure lines, using modulating control to maintain stable delivery pressure.

B. Industrial Gas Processing

Inert Gas Handling: Controls nitrogen/argon flow in welding or food packaging lines, with 316 material resisting corrosion from compressed air moisture.
Gas Mixing Systems: Mixes reactive and inert gases (e.g., hydrogen and nitrogen in chemical synthesis) via T-type convergence, ensuring precise ratio control.

C. Municipal Gas Systems

Emergency Shut-Off: Automatically closes via electric actuation when gas leaks are detected, protecting neighborhoods from explosion risks.
District Heating: Directs gas to boilers or backup fuel systems, with FKM seals handling heated combustion gases.

D. Specialty Gas Applications

Medical Gas Pipelines: Manages oxygen/helium flow in hospitals (degreased version), with threaded connections simplifying installation in wall cavities.
Laboratory Gases: Controls high-purity gas flow (e.g., calibration gases) with PTFE seals to avoid contamination.

TIANYU DN80 PN16 electric 3-way threaded ball valve: 3” size, 1.6MPa, 304/316 stainless steel, gas-tight sealing. Ideal for natural gas, industrial gases—combines 3-way diversion/convergence, electric control, and corrosion resistance.Customize with: 316L for extreme corrosion, FKM seals for 200℃ gases, explosion-proof actuators for hazardous areas, or NPT/BSPT thread options. Tailored to your gas type, pressure, and control needs.

DN80 PN16 Electric 3-Way Threaded Ball Valve for Gas Media Customizable 3-Way Ball Valves