TECHNICAL DATA SHEET
Product: DBB Double Block & Bleed Ball Valve
Rozmiar: 1 inch (DN25)
Klasa ciśnienia: Class 1500
Design: Double Ball in Series, Integral Body
End Connections: One End NPT (Female) / Opposite End Flanged
- Basic Specifications
Parametr | Value |
Rozmiar nominalny | 1″ (DN25) |
Ocena ciśnienia | Class 1500 (PN250) |
Projekt zaworu | Double Block & Bleed (DBB) – two ball valves in series with integral bleed port |
End Connections | Upstream: NPT Female (per ASME B1.20.1) Downstream: Flanged – ASME B16.5 Class 1500 (RF or RTJ) |
Temperature Range | –29°C ~ +500°C (depending on seat material) |
Suitable Media | High-pressure gas/liquid, steam, corrosive fluids |
Fire Safe Design | API 607 / ISO 10497 |
- Features & Functionality
- DBB Functionality (Double Block & Bleed): Two independent ball valves in series with a bleed port between them. When both valves are closed, the intermediate cavity can be vented or monitored, providing positive double isolation from both upstream and downstream sides.
- Integral Body Construction: Both ball valves share a single compact body, minimizing potential leak paths and reducing installation space.
- Blowout-Proof Stem: Each ball valve is equipped with a blowout-proof stem for safe operation under high pressure.
- Versatile Seating Options: Available with soft seats (PTFE / PEEK) or metal seats (tungsten carbide / Stellite) to suit high-temperature, high-pressure, or abrasive media applications.
- Operating Modes: Can be fitted with hand levers, gear operators, pneumatic actuators, or electric actuators; the two ball valves can be operated independently or simultaneously.
- Material List (Recommended High-Pressure / High-Temperature Configuration)
Item | Part | Standard Material |
1 | Ciało | A105N (ASTM A105 Normalized) / F316 |
2 | Ball (2 pcs) | A105N + Tungsten Carbide Coating / 316SS + Tungsten Carbide Coating |
3 | Seat Rings (2 sets) | 316SS + Stellite 21 Hardfacing |
4 | Stems (2 pcs) | 17-4PH / Inconel 718 |
5 | Stem Packing | Flexible Graphite + Braided Graphite |
6 | Body Gasket | Spiral Wound, SS + Graphite |
7 | Bleed / Test Port | 1/2″ NPT or Socket Weld |
8 | Bolting | A193 B7 / A194 2H |
Note: NACE MR0175 compliant materials are available for sour service applications.
- Dimensions & Structural Data
Parametr | Value |
Face-to-Face Length (L) | ~280 – 320 mm (varies by design; confirm with drawing) |
Flange End | ASME B16.5 Class 1500 – Raised Face (RF) or Ring Type Joint (RTJ) |
NPT End | 1″ NPT Female per ASME B1.20.1 |
Bleed Port Size | 1/2″ NPT or 1/2″ Socket Weld |
Top Height (H) | ~220 mm (with hand lever) |
Operating Torque (per ball) | ~80 – 150 N·m |
Approx. Weight | ~22 – 30 kg (mixed end configuration) |
Note: Final dimensions to be confirmed by manufacturing drawings.
- Design & Testing Standards
Item | Standard |
Design & Manufacture | API 6D (DBB Valves) / API 608 / ASME B16.34 |
NPT End | ASME B1.20.1 |
Flanged End | ASME B16.5 |
Pressure-Temperature Rating | ASME B16.34 |
Fire Safe Test | API 607 or API 6FA |
Pressure Testing | API 598 or ISO 5208 |
Low-Pressure Air Test | 0.6 MPa (6 bar) – no visible leakage |
High-Pressure Hydrostatic Test | 1.5 × rated pressure (body), 1.1 × rated pressure (seat) |
DBB Functional Test | With both balls closed and bleed port open, no leakage from upstream or downstream |
- DBB Functionality Description
The Double Block & Bleed configuration is essential for applications requiring absolute isolation:
- Instrument Isolation: Provides safe isolation and venting for pressure transmitters, flow meters, and other instruments, enabling maintenance without process interruption.
- Sampling Systems: Allows safe fluid sampling by double isolation and intermediate venting, preventing hazardous media exposure.
- High-Pressure Gas Systems: Ideal for natural gas, hydrogen, and other high-pressure gases where positive shut-off is critical.
- Online Maintenance: Enables isolation of a pipeline section without draining the entire system.
- Operating Torque & Actuator Sizing
- Simultaneous Operation: If both ball valves are to be operated together (e.g., with a single actuator or geared linkage), total torque is approximately the sum of individual ball torques.
- Independent Operation: If each ball is operated separately, size actuators per individual ball torque.
- High-Temperature & Metal Seated: Metal seated configurations generate higher torque due to thermal expansion; actuator output torque should be at least 1.3 ~ 1.5 times the maximum measured valve torque.
- Typical Applications
- Oil & gas pipelines and station piping
- Refinery instrument impulse line isolation
- Chemical plant sampling systems
- High-pressure hydraulic test benches
- Hydrogen refueling station high-pressure circuits
This data sheet reflects the specified configuration: 1″ Class 1500 DBB valve with one NPT end and one flanged end. For customized materials (e.g., duplex, Inconel), NACE compliance, or automated actuation, please contact us for further details.
GWARANCJA:
SAVVY VALVES zobowiązuje się do dostarczania wyjątkowej jakości produktów i bezproblemowej obsługi posprzedażowej. Gwarantujemy, że nasze zawory zapewnią minimalny okres eksploatacji wynoszący 12 miesięcy, podczas którego dostarczymy bezpłatnie wszystkie niezbędne części zamienne i szczegółowe instrukcje dotyczące konserwacji. W okresie gwarancyjnym, jeśli wystąpią jakiekolwiek uszkodzenia niespowodowane przez człowieka, wymienimy komponenty bezpłatnie i zapewnimy profesjonalne wsparcie techniczne. Po wygaśnięciu gwarancji klienci muszą zapłacić jedynie za koszt części zamiennych, nadal korzystając z usług konserwacyjnych po obniżonych cenach. Naszym celem jest pomoc klientom w obniżeniu kosztów operacyjnych i zwiększeniu wydajności produkcji dzięki niezawodnej jakości i kompleksowemu wsparciu posprzedażowemu. Niezależnie od tego, czy chodzi o zapytania techniczne, czy potrzeby konserwacyjne, nasz zespół ekspertów odpowie szybko, aby zapewnić, że Twój system zaworów zawsze będzie utrzymywał optymalną wydajność.