Description

Technical Data Sheet: 6″ (DN150) ASME Class 2500 Flanged Ball Valve (WCB Body)

1. Product Overview

This product is a 6-inch (DN150), ASME Class 2500 flanged ball valve equipped with a manual gear operator (handwheel). The valve body is constructed from ASTM A216 WCB cast carbon steel, providing high strength and excellent weldability for high-pressure industrial applications. At ambient temperature, Class 2500 WCB delivers a pressure rating of 425 bar (6,168 psi). The valve features a full bore design with a bolted body construction, allowing for easy access to internal components for maintenance. A blowout-proof stem and fire-safe design ensure operational safety in demanding high-pressure service environments. This valve is designed in accordance with API 6D and ASME B16.34 standards.

2. Technical Specifications

Note: WCB material is rated for service from -29°C to 425°C. Below -29°C, low-temperature carbon steel (ASTM A352 LCB) should be specified. Above 425°C, creep becomes a concern and alloy steel castings are required.

3. Main Component Materials

4. Design Features

4.1 Bolted Body Construction

The valve features a two-piece or three-piece bolted body design, allowing for easy disassembly and access to internal components (ball, seats, stem) for inspection, cleaning, or replacement without removing the entire valve from the pipeline.

4.2 Blowout-Proof Stem Design

The stem is machined with a heavy shoulder to prevent blowout, ensuring operational safety under high-pressure conditions. The stem is made from high-strength 17-4PH stainless steel, which provides excellent mechanical properties and corrosion resistance.

4.3 Fire-Safe Design

The valve is equipped with a fire-safe design tested to API 607 and API 6FA standards. In the event of a fire, the graphite secondary seal ensures valve integrity and prevents media leakage.

4.4 Anti-Static Device

An anti-static device (Inconel spring) is placed between the body, ball, and stem to prevent static electricity buildup and ensure electrical continuity.

4.5 Full Bore Design

The valve features a full bore design, providing a flow path equal to the pipe inner diameter. This ensures minimal pressure drop and allows for pipeline pigging operations.

4.6 Gear Operator

A manual gear operator (handwheel) is provided for reliable operation. Given the high torque requirements of a 6-inch Class 2500 valve, the gearbox significantly reduces the operating torque, making it easy to open and close the valve even under maximum pressure differential.

5. Dimensional Reference

NPS 6 (DN150) ASME CLASS 2500

Note: Face-to-face dimension per ASME B16.10 (Long Pattern). Flange dimensions per ASME B16.5 Class 2500. Actual dimensions may vary slightly by manufacturer. Please refer to the certified drawing for exact dimensions.

6. Pressure Test

Inspected and tested in accordance with API 598:

Note: The shell test is 1.5 times the Cold Working Pressure (CWP) at ambient temperature. For ASME Class 2500, the CWP is 425 bar (6,168 psi).

7. Chemical and Mechanical Properties (WCB)

8. Installation & Operation Instructions

1. Installation Orientation: The valve can be installed in horizontal or vertical pipelines. Ensure adequate clearance for the gear operator and handwheel operation.

2. Flow Direction: Ball valves are bi-directional and can be installed in either flow direction. However, the arrow on the body should be followed for optimal performance.

3. Flange Bolting: Use appropriate gaskets (spiral wound or ring joint) and tighten the flange bolts evenly in a cross-pattern to prevent uneven stress on the valve body. For Class 2500 flanges, bolt torque is critical—consult the manufacturer’s recommendations.

4. Pipeline Cleaning: Thoroughly clean the piping system before installation to remove welding slag, debris, or foreign objects that could damage the ball and seat sealing surfaces.

5. Operation: Rotate the handwheel clockwise to close and counterclockwise to open. The valve is fully closed when the indicator points to “CLOSED” and fully open when it points to “OPEN.” Avoid using excessive force, which could damage the gear operator or stem.

6. Maintenance: Periodic inspection of the ball and seat is recommended. The bolted body design allows for inline maintenance. Ensure the pipeline is depressurized and drained before disassembly. The stem packing should be inspected periodically and replaced if leakage occurs.

9. Applications

• High-pressure oil and natural gas transmission pipelines

• Wellhead and Christmas tree equipment

• High-pressure water injection systems

• Petrochemical plant high-pressure process lines

• Power industry high-pressure steam and feedwater systems

• Hydraulic systems and high-pressure test equipment

10. Ordering Information

Please provide the following information when ordering:

1. Nominal Size (NPS / DN)

2. Pressure Rating (ASME CLASS)

3. Body Material (WCB / LCB / CF8M, etc.)

4. Trim Material (316 SS + ENP / Stellite / PTFE, etc.)

5. Connection Type (RF / RTJ / BW)

6. Bore Type (Full Bore / Reduced Bore)

7. Operation Type (Gear Operator / Lever / Pneumatic / Electric)

8. Special Requirements (NACE MR0175, Fire-Safe Certification, Anti-Static Device, Certification Requirements, etc.)