DN200 PN25 WCB Soft Seat Straight Through Type Manual Floating Top-Entry Ball Valves

Specification

DN200 PN25 WCB Soft Seat Straight Through Type Manual Floating Top-Entry Ball Valves

I. Product Overview

TIANYU’s DN200 PN25 WCB Soft Seat Straight Through Type Manual Floating Top-Entry Ball Valve is a precision-engineered industrial valve designed for efficient fluid control in diverse pipeline systems. Its straight through type structure ensures unobstructed fluid flow, while the floating ball design and top-entry construction combine to deliver reliable sealing performance and easy maintenance, making it suitable for a wide range of industrial applications.

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 and relies on media pressure to create a tight seal against the seat. The top-entry structure allows for direct access to internal components from the top, simplifying maintenance procedures. The straight through type design ensures that the fluid path is linear, minimizing flow resistance and pressure loss.

B. Size and Pressure Rating

With a nominal diameter (DN) of 200, the valve is capable of handling large-volume fluid flow, meeting the demands of medium to large-scale industrial pipelines. It has a pressure rating (PN) of 25, enabling it to operate stably under a maximum working pressure of 25 bar, making it suitable for medium-pressure industrial systems.

C. Material Composition

Valve Body and Ball: Constructed from WCB (cast carbon steel), a durable material with excellent mechanical properties, ideal for general industrial environments involving non-corrosive or mildly corrosive media.

Sealing Components: Equipped with soft seats made of PTFE (polytetrafluoroethylene), which offers superior chemical resistance, low friction, and reliable sealing performance across a temperature range of -20°C to 180°C.

D. Connection and Operation

The straight through type connection ensures a linear flow path, facilitating smooth fluid movement with minimal turbulence. The valve is operated manually via a handwheel, providing precise control over the opening and closing process, suitable for applications where automated control is not required.

Product Overview

III. Features Description

A. Straight Through Type Advantage

The straight through type design creates a linear fluid path, which significantly reduces flow resistance compared to valves with non-linear paths. This ensures efficient fluid transfer, reduces energy consumption, and makes the valve suitable for applications where maintaining high flow rates is crucial, such as in water supply and industrial fluid transport systems.

B. Floating Ball Sealing Performance

The floating ball design utilizes media pressure to enhance sealing. As the pressure of the fluid increases, the ball is pushed tighter against the seat, ensuring a secure seal even under varying pressure conditions. This design provides reliable sealing performance, minimizing leakage and ensuring the integrity of the pipeline system.

C. Top-Entry Design Benefit

The top-entry structure allows for easy maintenance and repair without removing the valve from the pipeline. By removing the top cover, technicians can access internal components such as the ball, seat, and stem, reducing downtime and maintenance costs. This is particularly advantageous in continuous production processes where system shutdowns are costly.

IV. Manufacturing Process

A. Material Selection and Inspection

High-quality WCB cast carbon steel is selected for the valve body and ball, undergoing rigorous chemical composition analysis and mechanical property testing to ensure compliance with industry standards. PTFE materials for the seats are inspected for purity and uniformity to guarantee sealing performance.

B. Precision Machining

Advanced CNC machining techniques are employed to achieve precise dimensions for the valve body, ball, and internal components. The ball’s sealing surface is polished to a high degree of smoothness (Ra 0.8μm or lower) to ensure tight contact with the seat. The straight through flow path is machined to strict tolerances to minimize flow resistance.

C. Assembly and Testing

Components are assembled in a clean environment to prevent contamination. The PTFE seats are installed with precise preload to ensure optimal sealing and smooth operation. After assembly, each valve undergoes rigorous testing, including pressure testing at 1.5 times the nominal pressure to check for structural integrity and sealing testing at 1.1 times the nominal pressure to ensure no leakage. The manual operation mechanism is tested for smooth rotation and accurate control.

Valve Details

V. Product Advantages

A. Efficient Flow Performance

The straight through type design ensures minimal flow resistance, allowing for high flow rates and reduced energy consumption. This makes the valve an efficient choice for applications where fluid transfer efficiency is a priority.

B. Reliable Sealing

The combination of the floating ball design and PTFE soft seats provides excellent sealing performance across a range of pressures and temperatures, minimizing leakage and ensuring the safety and efficiency of the pipeline system.

C. Easy Maintenance

The top-entry design enables quick and convenient access to internal components, reducing maintenance time and costs. This is especially beneficial in industrial settings where downtime must be minimized.

D. Durable Construction

The use of high-quality WCB material and precision manufacturing ensures the valve’s long service life, even in harsh industrial environments. The PTFE seats are resistant to wear and chemical corrosion, further enhancing durability.

Application

VI. Product Applications

A. Water and Wastewater Treatment

Suitable for use in water supply pipelines, wastewater treatment plants, and irrigation systems, where the straight through design ensures efficient water flow and the reliable sealing prevents leakage.

B. Chemical Industry

Ideal for handling non-corrosive or mildly corrosive chemicals, thanks to the chemical resistance of PTFE seats and WCB material. The valve’s efficient flow performance and easy maintenance make it a practical choice for chemical processing lines.

C. Power Generation

Used in auxiliary systems of power plants, such as cooling water circuits and fuel supply lines, where reliable operation and efficient fluid control are essential.

D. General Industrial Systems

Applicable to various industrial fluid transport systems, including those handling oils, gases, and other non-corrosive fluids, providing efficient and reliable flow control.