Overview
Water Valves’ Double Block & Bleed (DBB) valve offers a compact, high-integrity solution for critical isolation and venting in high-pressure systems. Designed to replace complex multi-valve assemblies, our DBB valves integrate two isolation valves and one bleed valve in a single body—saving space, weight, and reducing potential leak paths. Ideal for oil & gas, petrochemical, and offshore platforms.
Product Features：
Dual isolation + central bleed function
Compact one-piece forged or bar stock body
Available in ball/ball, needle/needle, or needle/ball combinations
Blowout-proof stem design
Fire-safe & anti-static design (API 607 compliant)
Suitable for horizontal or vertical installation
Available in flanged, threaded, or welded end connections
Categories
Features
- Maximum working pressure: 10,000 psig (690 bar)
- Special design to enable lubricant or sealant to flow around the spring and through the opening on the sides of
the retainer smoothly - All-metal construction, applicable in both high and low temperature environments
Component
No. | Component | Carbon Steel | SS 316 |
|---|---|---|---|
1 | Vent Cap | CS (Zinc) | SS 316/A479 |
2 | Body | CS (Zinc) | SS 316/A479 |
3 | Ball | 316/A276 | Tungsten Carbide |
4 | Spring | X-750/AMS 5699 | X-750/AMS 5699 |
5 | Retainer | SS 316/A479 | SS 316/A479 |
Technich Data
Considerations When Buying Grease Fittings
End connections
NPT 1/4″, 3/8″, 1/2″, 3/4″, 1″
GAS 3/8″, 1/2″
Working pressure
Working pressure up to: 10,000 psig (690 bar)
Available material
A105 LF2
304 Stainless Steel 316L Stainless Steel
Alloy 400 Alloy 625 Alloy C-276
Duplex 2205 Duplex 2207
NOTES: other products or different fittings designs are available on request; all measures are in millimeters.
Benefit From Your Committed Valves and Fittings Manufacturer
Free Fittings Sample
Walter offers you a free fitting sample for testing and to confirm that we met your custom design requirements.
Wholesale Fitting Price
Our high-quality fittings are available at wholesale rates which saves you money and reduces your costs of production.
Low Minimum Order Quantity
All our clients are important to us and thus our MOQ is 10 pieces to accommodate large and small orders.
High Bottle Quality
We are meticulous with our quality checks and manufacturing standards. Our goal is to offer you the best glass bottles.
Worry-free Aftersale Services
The Walter team is always on hand to guide you through aftersale procedures such as warehousing, shipment, and just-in-time delivery.
FAQ
A: A double block and bleed (DBB) valve combines two isolation valves and one bleed valve into a single compact body. It ensures complete isolation of process media for maintenance, pressure relief, or safety checks, while minimizing the risk of leakage from upstream lines.
A: We offer multiple configurations, including ball-ball, needle-needle, and needle-ball combinations. Selection depends on the application’s pressure class, flow media, and control requirements.
A: DBB valves are widely used in oil & gas, petrochemical, chemical processing, power generation, and offshore drilling—especially for pressure transmitter isolation, chemical injection, and pipeline maintenance.
A: Yes. Our DBB valves are available with threaded (NPT/BSP), flanged (ASME B16.5), socket weld, or butt weld ends. Custom end connection types are also supported on request.
A: All valves undergo 100% hydrostatic and seat leakage testing per API 598. We also offer fire-safe certification (API 607), NACE MR0175 compliance, CE marking, and third-party inspection if required.
Ready to Source Reliable Valve Solutions?
At Water Valves, we specialize in precision-engineered valves and fittings built to perform in the world’s most demanding industries. Whether you need standard components or custom solutions, our team is here to support your project needs.
