Single Block and Bleed (SBB) Valve: Compact Isolation for Non-Critical Service
The Single Block and Bleed (SBB) Valve is the ideal solution for efficient, reliable isolation and venting in non-critical process and instrumentation lines. This compact, one-piece assembly seamlessly combines one main shut-off (block) valve and a smaller bleed valve into a single body. The SBB valve simplifies installation, reduces potential leak paths, and offers significant weight, space, and cost savings over traditional multi-valve setups.
Designed for basic isolation and safe depressurization of trapped fluids, the SBB valve provides an efficient transition from the process pipeline to instrument lines.
✨ Product Highlights and Technical Specifications
This Single Block and Bleed Valve utilizes robust bar stock construction and high-performance engineering to meet rigorous industry demands.
| Feature | Specification Details |
| Max Working Pressure | Up to 10,000 psig (689 bar) |
| Working Temperature | From -10°F to 1200°F (-23°C to 649°C) |
| Body Construction | Utilizes premium bar stock body construction for maximum integrity. |
| Connection Type | Flanged connections complying with ASME B16.5. |
| Design Reliability | Standard high-performance bonnet design with blowout-proof valve stems and needles. |
| Material Traceability | Complete traceability of materials (MTRs available upon request). |
⚙️ Key Features and Advantages
Our SBB valve is engineered for superior functionality and operational ease in applications where verifiable double isolation is not mandated.
1. Enhanced Operational Design
Low-Torque Actuation: The stem and body shoulders are separated by a PEEK thrust bearing, ensuring smooth, low-torque actuation, even under high pressure.
Positive Sealing: Features a live-loaded stem seal to ensure positive sealing integrity across the full pressure and temperature range.
Stem Assembly Lock: Independent handle nuts lock the stem assembly securely in place, even if the handle is removed.
Cavity Pressure Relief: Designed with cavity pressure relief to prevent overpressurization caused by the thermal expansion of system media when the valve is closed.
2. Compact and Economical
Space & Cost Saving: Offers significant weight, space, and cost savings over fabricating traditional piping designs (using three separate valves, nipples, and fittings).
Leak Path Reduction: The one-piece structure dramatically reduces potential leakage points compared to multi-flange or threaded connections.
3. Versatility and Material Options
Configuration: Offers combinations of ball valves and needle valves in various configurations for block and bleed functionality.
Material Options: Standard materials include stainless steel and carbon steel. Optional exotic materials are available: Alloy 20, Alloy 400, Incoloy 825, and duplex stainless steel materials.
Bleed Port: Bleed port comes equipped with a plug; optional port sizes and threads are available.
🏭 Ideal Applications for SBB Valves
The Single Block and Bleed Valve is a practical and economical choice for basic isolation needs:
Instrument Isolation: Safely isolating pressure gauges, transmitters, and switches from the process line for calibration or replacement.
Low-Pressure Systems: Providing isolation and draining in utility lines, low-pressure air, or cooling water systems where the consequences of minor leakage are non-critical.
Sampling Lines: Providing a convenient point for safely draining and venting before taking fluid samples.
⚠️ Note on Safety: SBB vs. DBB
While highly effective for basic isolation, the SBB valve offers a single block seal. For applications involving highly hazardous, toxic, high-pressure, or flammable media where verifiable zero-leakage is mandated (e.g., API regulations), a Double Block and Bleed (DBB) Valve with redundant sealing is required.
➕ More Options for Your Specification
Customize your SBB valve to meet precise system demands:
Optional Block & Bleed Types: Choose combinations using ball valve or needle valve elements.
Material Upgrades: Select optional materials including 316 stainless steel, Alloy 20, Alloy 400, Incoloy 825, and duplex stainless steel materials.
Sour Gas Service: Optional materials and design compliance are available for sour gas service (NACE MR0175 / ISO 15156).
Fast Response & Competitive Pricing Start Here
* We are not just providing simple quotes but experts in selection, calculation, and drawing.
