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DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves
  • DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves
  • DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves
  • DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves
  • DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves

DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves

Product Attribute: Specification:DN50-DN1200
Material:Stainless Steel
Connection Form:Flange
Driving Mode:Manual
Nominal Pressure:ANSI CLASS 150-900
Channel:Straight Through Type
Structure:float Ball Valve
Function:Relief Valve
Temperature:Normal Temperature
Standard:API 6D, API608, BS 5351
Application:Industrial Usage
Pressure:300lb
Ball/Stem/Body:304ss
Seat:PTFE
INFO@TYFLUIDGROUP.COM

Specification

DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valves

I. Product Overview

TIANYU’s DN200 PN25 304 Stainless Steel Flanged End Top-Entry Forge Floating Ball Valve is a robust industrial fluid control solution engineered for reliability in demanding environments. Combining the strength of forged 304 stainless steel, the convenience of a top-entry design, and the sealing efficiency of a floating ball structure, it balances corrosion resistance, structural integrity, and ease of maintenance—making it a versatile choice for diverse industrial fluid handling systems.

II. Important Attribute and Specification Parameters

A. Structural Type

The valve features a floating ball design, where the ball is not fixed to the valve body, relying on media pressure to press against the sealing seat for tight closure. Its top-entry structure allows access to internal components (ball, seat, stem) from the top, eliminating the need to disconnect the valve from the pipeline during maintenance. The forged construction enhances material density, while flanged ends provide secure pipeline integration.

B. Size and Pressure Rating

With a nominal diameter (DN) of 200, it accommodates large-volume fluid flow, suitable for medium to large-scale industrial pipelines. The pressure rating (PN25) enables stable operation under a maximum working pressure of 25 bar, making it compatible with medium-pressure systems such as chemical processing lines, oil transfer pipelines, and water treatment networks.

C. Material Composition

  • Valve Body, Ball, and Stem: Crafted from 304 stainless steel, an austenitic alloy containing 18-20% chromium and 8-10.5% nickel. This material offers excellent corrosion resistance against water, mild acids, alkalis, and organic solvents, while its forged structure eliminates internal porosity, enhancing tensile strength and pressure resistance.
  • Sealing Components: Equipped with PTFE (polytetrafluoroethylene) seats, known for low friction, chemical inertness, and reliable sealing across temperatures from -20°C to 180°C. PTFE ensures consistent tightness even with frequent valve cycling.

D. Connection and Operation

Flanged ends conform to international standards (ANSI B16.5, DIN EN 1092) for seamless compatibility with existing pipelines, ensuring leak-free assembly when paired with gaskets. Operation is typically manual via a handwheel, providing precise control over opening/closing with intuitive torque feedback, suitable for applications where automated control is unnecessary.

Product Overview

III. Features Description

A. Forged 304 Stainless Steel Advantage

Forging 304 stainless steel at high temperatures (1100-1200°C) refines the material’s grain structure, eliminating casting defects like porosity or shrinkage. This results in a valve body and ball with superior mechanical strength—resistant to deformation under high pressure or thermal stress, a critical trait in harsh industrial environments where structural failure could lead to leaks or system downtime.

B. Top-Entry Design for Maintenance Efficiency

The top-entry structure simplifies upkeep: by removing the top cover, technicians can inspect, repair, or replace internal components (such as worn seats or stems) without disconnecting the valve from the pipeline. This reduces maintenance time by up to 50% compared to side-entry valves, minimizing production interruptions—a key benefit in continuous-process industries like refineries or chemical plants.

C. Floating Ball Sealing Performance

The floating ball design leverages media pressure to enhance sealing: as fluid pressure increases, the ball is pushed tighter against the PTFE seat, ensuring a secure seal even under fluctuating pressure conditions. At low pressures, the seat’s preload maintains reliable tightness, avoiding leakage issues common in fixed-ball valves operating at reduced loads. This adaptability makes it suitable for systems with varying pressure demands.

D. Flanged End Reliability

Flanged connections distribute stress evenly across the valve-pipeline joint, ensuring a stable seal under pressure and thermal expansion. Compatible with standard gaskets (rubber, PTFE, metal), they simplify installation and replacement, while their robust design resists vibration—critical for applications like pump discharge lines or high-flow pipelines.

IV. Manufacturing Process

A. Material Inspection and Forging

Raw 304 stainless steel undergoes rigorous testing, including spectrometric analysis to verify chemical composition and ultrasonic testing to detect internal flaws. The material is then heated to forging temperature and shaped into valve body blanks using hydraulic presses, a process that aligns metal grains to enhance strength and corrosion resistance.

B. Precision Machining

CNC machining centers refine the forged blanks to exact dimensions: valve body internal surfaces are bored to ensure smooth flow, ball sealing surfaces are ground to a roughness of Ra 0.8μm for tight seat contact, and flange faces are machined to meet standard tolerances. The stem is precision turned and polished to minimize friction, ensuring smooth operation and preventing media leakage along the stem.

C. Assembly and Quality Testing

Assembly occurs in a clean workshop to avoid contamination of PTFE seats. Seats are installed with calibrated preload to balance sealing performance and operational torque. Post-assembly, each valve undergoes:
  • Shell pressure test: 1.5 times PN25 to verify structural integrity.
  • Seat tightness test: 1.1 times PN25 with air or water to ensure zero leakage.
  • Operational test: Manual handwheel rotation checked for smoothness and accurate positioning.

Valve Details

V. Product Advantages

A. Superior Corrosion Resistance

304 stainless steel’s chromium oxide layer resists rust and chemical attack, outperforming carbon steel valves in environments with moisture, mild acids, or saltwater. This extends service life, reducing replacement frequency and long-term costs.

B. Reduced Downtime

The top-entry design cuts maintenance time, critical for industries where shutdowns are costly. Technicians can service internal components in-situ, minimizing production losses compared to valves requiring full pipeline disconnection.

C. Reliable Sealing Across Conditions

The floating ball and PTFE seat combination ensures consistent sealing from low to high pressures, with leakage rates meeting API 6D standards. This reliability minimizes product loss, environmental risks, and process inefficiencies.

D. Durable Under Stress

Forged construction and 304 stainless steel’s mechanical properties enable the valve to withstand pressure spikes, thermal cycling, and vibration—ensuring stable performance in harsh industrial settings.

Application

VI. Product Applications

A. Chemical Processing

Ideal for handling mild acids, alkalis, and organic solvents. Its corrosion resistance and tight sealing prevent contamination, making it suitable for batch reactors, solvent recovery lines, and chemical transfer pipelines.

B. Oil and Gas Midstream

Used in crude oil and refined product transfer pipelines. The PN25 rating and forged strength handle pipeline pressure fluctuations, while flanged ends ensure secure connections in long-distance transport systems.

C. Water and Wastewater Treatment

Suitable for municipal water supply, desalination, and wastewater networks. 304 stainless steel resists corrosion from chlorinated water, and the large DN200 size accommodates high flow rates in distribution systems.

D. Food and Pharmaceutical

Compliant with hygiene standards, the valve’s smooth internal surfaces (minimizing media trapping) and 304 stainless steel construction make it suitable for food-grade fluid transfer (e.g., syrup, edible oils) and pharmaceutical process water systems.

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