Description

Technical Data Sheet (TDS)

Document No.: TDS-DBB-SV-001
Version: V1.0
Issue Date: October 3, 2026
Prepared by: Engineering Department

---

1. Product Identification

---

2. Product Description

This product is a Flanged Double Block and Bleed (DBB) Sampling Ball Valve designed for 2″ Class 1500 service, with all wetted parts made of 316 Stainless Steel. The valve features a dual-ball tandem isolation structure, integrating two isolation ball valves into a single body, combined with a cavity bleed valve to provide the highest level of double isolation and safe depressurization.

The inlet is equipped with an ASME B16.5 Class 1500 RF flange. The outlet integrates a sampling probe (extended sampling tube) with multiple equidistant sampling holes, enabling representative multi-point sampling within the pipeline. The valve body is equipped with dual operating handles, controlling the primary and secondary isolation ball valves respectively. The bleed valve assembly is located between the two ball valves, utilizing a needle-type globe valve for cavity depressurization, draining, or purging of the sampling line.

The design complies with API 6D, ASME B16.34, and ASME B16.5 standards, making it suitable for safe sampling and double isolation applications in petroleum, chemical, and natural gas industrial processes.

---

3. Technical Parameters

3.1 Basic Parameters

3.2 Material Parameters

316 SS Chemical Composition (Reference): C ≤ 0.08%, Si ≤ 1.00%, Mn ≤ 2.00%, P ≤ 0.035%, S ≤ 0.03%, Ni: 10.0-14.0%, Cr: 16.0-18.5%, Mo: 2.0-3.0%.

316 SS Mechanical Properties (Reference): Tensile Strength ≥ 620 MPa, Yield Strength ≥ 310 MPa, Elongation ≥ 30%, Density 8.03 g/cm³.

3.3 Flange Connection Dimensions (2″ Class 1500 ASME B16.5)

3.4 Sampling Probe Parameters

---

4. Structural Features

• Double Block and Bleed (DBB) Structure: Two independent ball valves in series within a single body, forming a double isolation barrier. The intermediate cavity is equipped with a bleed port, meeting the highest safety isolation requirements.

• Anti-Blowout Stem: The stem is designed with an anti-blowout structure to ensure it will not be ejected under extreme pressure conditions.

• Anti-Static Device: Anti-static grounding is provided between the ball, stem, and body to eliminate static electricity buildup risks.

• Dual Operating Handles: Each ball valve is equipped with an independent handle for 90° quick opening and closing.

• Integrated Sampling Probe: The outlet is equipped with a multi-hole sampling probe, allowing simultaneous sampling at different depths within the pipeline for improved sample representativeness.

• Needle Bleed Valve: The intermediate cavity is equipped with a 316 SS needle-type globe valve for cavity depressurization, draining, and purging of the sampling line.

• Fire-Safe Design: Complies with API 607 / API 6FA fire test requirements (optional).

• Low Fugitive Emissions: Can meet ISO 15848 low fugitive emission requirements (optional).

---

5. Operating Instructions

1. Pre-Sampling Preparation: Confirm the valve is in the closed position and check that the bleed valve is closed.

2. Open Primary Ball Valve: Rotate the first handle 90° to the open position, allowing media to enter the intermediate cavity.

3. Open Secondary Ball Valve: Rotate the second handle 90° to the open position, allowing media to flow through the sampling probe.

4. Sampling Operation: After the media flows steadily, collect the sample at the probe outlet using a sampling container.

5. Post-Sampling Closing: Close the secondary ball valve first, then close the primary ball valve.

6. Intermediate Cavity Bleed: After sampling, open the needle bleed valve to drain any residual media in the intermediate cavity, ensuring double isolation safety.

7. Reset: Close the bleed valve and confirm all handles are in the closed position.

---

6. Safety & Health

For detailed safety information, please refer to the SDS/MSDS of the corresponding media.

---

7. Storage & Maintenance

• Storage Conditions: Store in a dry, ventilated indoor environment, avoiding moisture and corrosive gases.

• Storage Temperature: -20°C to +50°C.

• Protection Measures: Apply anti-rust grease to flange sealing surfaces and cover with protective caps.

• Packaging: Wooden case packaging with moisture-proof lining.

• Maintenance Cycle: Routine inspection recommended every 12 months or every 2,000 operations.

• Maintenance Items: Check packing sealing, seat sealing, handle operation flexibility, and anti-static continuity.

• Seal Replacement: If leakage is found, stop using the valve and replace seals. Replacement must be performed by qualified personnel.

---

8. Inspection & Testing

---

9. Packaging & Transportation

---

10. Regulations & Compliance

• Design Standard: API 6D, ASME B16.34

• Flange Standard: ASME B16.5

• Testing Standard: API 598, ISO 5208

• Fire-Safe Standard: API 607 / API 6FA (Optional)

• Low Fugitive Emission Standard: ISO 15848 (Optional)

• Pressure Equipment Directive: PED 2014/68/EU (If applicable)

---

11. Version History

---

12. Disclaimer

The information provided in this Technical Data Sheet is based on current product design and manufacturing standards and is for reference only. Actual dimensions, weights, and performance parameters may vary depending on specific designs, material batches, and operating conditions. Users should confirm actual conditions prior to selection and installation and verify final technical parameters with the manufacturer. The manufacturer assumes no liability for direct or indirect damages arising from conditions of use beyond its control.