Specification

TIANYU Pneumatic Carbon Steel Flange Floating Ball Valve

I. Product Overview

TIANYU Pneumatic Carbon Steel Flange Floating Ball Valve is a high-performance fluid control device designed for industrial pipeline systems. Driven by a pneumatic actuator, it uses a floating ball structure to realize on-off control of fluids (liquid, gas, slurry) through 90° rotation of the ball core. Made of carbon steel as the main material (with optional stainless steel components for key parts), it features reliable sealing, fast response, and strong adaptability to harsh working conditions. Compliant with international standards such as API, ANSI, and GB, it is widely used in petroleum, chemical, power, and municipal systems, serving as a core component for safe and efficient fluid transmission.

II. Key Attribute Specifications

Size Range: Nominal diameter (DN) covers DN15 to DN300 (1/2″ to 12″), adapting to small-caliber precision control pipelines (e.g., instrument lines) and medium-to-large industrial main pipelines (e.g., oil transmission mains).
Pressure Class: PN16 to PN40 (Class150 to Class300), with maximum working pressure up to 4.0MPa (Class300), meeting low, medium, and high-pressure system requirements.
Material Composition:
- Valve Body & Bonnet: Carbon steel (WCB, ASTM A216), with high strength (tensile strength ≥485MPa) and good weldability, suitable for most neutral and low-corrosive media.
- Ball Core: 304 stainless steel (optional 316 for corrosive media), ensuring wear resistance and smooth rotation; surface finish reaches Ra0.8μm for tight sealing.
- Sealing Components: PTFE (Teflon) or RPTFE (reinforced Teflon) seats, with temperature resistance up to 200℃; metal backup rings for high-pressure models to prevent seal deformation.
- Stem: 1Cr13 stainless steel, surface nitrided to enhance wear and corrosion resistance.
Connection Type: RF (Raised Face) flange ends, compliant with ANSI B16.5 or GB/T 9113 standards, ensuring tight alignment with pipeline flanges and minimizing leakage risks.
Pneumatic Actuator Parameters:
- Drive Source: Compressed air (0.4-0.6MPa), compatible with industrial air supply systems.
- Action Time: 0.5-5 seconds (varies by size), enabling fast on-off control to respond to system pressure or flow changes.
- Structure: Double-acting (pneumatic drive for both opening and closing) or spring-return (pneumatic opening, spring closing) to meet different safety requirements (e.g., fail-close/fail-open).
Operating Conditions:
- Applicable Media: Water, oil, natural gas, steam, and low-corrosive slurry (with optional hard-sealed structure for abrasive media).
- Temperature Range: -29℃ to 200℃ (PTFE seals), adapting to cryogenic, normal, and medium-temperature working conditions.
Sealing Performance: Bubble-tight sealing (zero leakage under rated pressure), tested per API 598 standard—no visible bubbles in 1-minute air test at 0.6MPa.

Product Overview

III. Feature Description

Floating Ball Structure Advantage: The ball core is not fixed by a shaft but “floats” in the valve body. When the valve is closed, medium pressure pushes the ball against the downstream seat, realizing automatic tight sealing. This design ensures bidirectional sealing (can block flow from either direction) and reduces machining accuracy requirements for the ball, balancing performance and cost.
Pneumatic Drive Efficiency: Pneumatic actuators convert air pressure into rotational torque, enabling 90° fast switching (0.5s for DN15, 5s for DN300). Compared to manual valves, they reduce labor costs and improve response speed, critical for automated production lines.
Reliable Sealing System: PTFE seats with low friction coefficient ensure smooth ball rotation and tight sealing. For high-temperature or abrasive media, metal-to-metal hard seals (stellite surfacing on seats/ball) are optional, with temperature resistance up to 400℃.
Compact & Maintenance-Friendly: Integral valve body and actuator design saves installation space. The bonnet uses a bolted structure, allowing easy disassembly to replace seats or stems without removing the entire valve from the pipeline—reducing maintenance downtime.
Safety & Compatibility: Equipped with a positioner (optional) for precise flow control; limit switches for remote status monitoring. Flange dimensions comply with international standards, ensuring compatibility with imported or domestic pipeline systems.

IV. Manufacturing Process

TIANYU strictly controls each production step to ensure product quality:

Material Preparation: Carbon steel ingots (WCB) undergo ultrasonic testing to eliminate internal defects. Forged or cast into valve body/bonnet blanks, then rough-machined to basic dimensions (tolerance ±0.1mm).
Ball & Seat Machining: 304 stainless steel balls are precision ground (roundness ≤0.005mm) and polished to Ra0.8μm. PTFE seats are molded and machined to match the ball curvature, ensuring 100% contact.
Valve Assembly: Stem is assembled with the ball via a key connection; bonnet is bolted to the body with a graphite gasket for static sealing. Actuator is connected to the valve stem through a coupling, calibrated for 90° rotation accuracy (error ≤±1°).
Sealing & Pressure Testing: Each valve undergoes two tests:
- Shell Test: 1.5× nominal pressure (e.g., 6.0MPa for PN40) with water, holding 30 minutes to check for body/bonnet leakage.
- Seat Test: 1.1× nominal pressure with air, using a bubble counter to verify zero leakage (≤1 bubble/min for Class150).
Actuator Debugging: Pneumatic actuators are tested for action time, torque output, and spring return force (for spring-return models) to ensure consistency with design parameters.

Valve Details

V. Product Advantages

High Efficiency & Cost-Effectiveness: Pneumatic drive reduces manual operation, cutting labor costs by 30-50% in automated systems. Carbon steel material balances performance and cost, 20-30% cheaper than full stainless steel valves for non-corrosive media.
Strong Adaptability: From low-temperature water to medium-temperature steam, from clean oil to slightly abrasive slurry, it adapts to diverse media through material customization (seats, ball). Pressure class coverage meets most industrial pipeline requirements.
Long Service Life: WCB body resists corrosion in neutral media (annual corrosion rate ≤0.1mm); PTFE seats have a wear life of 10,000+ cycles under normal use. Proper maintenance ensures a lifespan of 8-10 years.
Safe & Stable Operation: Fast closing (spring-return models) prevents backflow or overpressure accidents; bubble-tight sealing avoids media leakage—critical for hazardous media (e.g., flammable gases, toxic liquids).

Application

VI. Product Applications

Petroleum & Chemical Industry: Crude oil transmission lines, chemical reagent pipelines, and refinery distillation systems—controlling on-off of oil, solvents, and intermediate products to ensure stable production.
Power Sector: Thermal power plant steam pipelines, cooling water systems—regulating steam flow to boilers or blocking backflow in cooling circuits, maintaining turbine efficiency.
Municipal Engineering: Urban water supply mains, sewage treatment pipelines—controlling water flow for distribution or intercepting sewage during maintenance, preventing contamination.
Metallurgy & Mining: Slurry pipelines (ore pulp, coal slurry) with optional hard seals—resisting abrasion to ensure continuous transportation of mineral materials.
Food & Pharmaceutical: Clean water, steam, and inert gas pipelines (with 316 stainless steel ball options)—meeting hygiene requirements for food processing or drug production.

TIANYU Pneumatic Carbon Steel Flange Floating Ball Valve (DN15-DN300, PN16-PN40) suits water, oil, gas, -29-200℃. Features fast pneumatic drive, bidirectional sealing, easy maintenance. Applies to petrochemical, power, municipal sectors. Customizable in material, seal, and actuator for specific needs.