PRODUCTS

Double block and bleed ball valve flange DBB ball valve

port size:DN15-DN150 (1/2″~6)

type:BALL VALVES

application:General

place of origin:Zhejiang, China

power:Manual

temperature of media:Normal

brand name:TIANYU

media:Oil,Gas,Water

Size:DN15-DN150 (1/2″~6)

Service:OEM/ ODM

Material:Stainless Steel 304/316

Medium:Water Oil Gas

Pressure:Normal Pressure

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Description

Specification

I. Product Overview

TIANYU high-pressure manual DBB (Dual Block and Bleed) valves are designed for critical pipeline isolation in high-pressure systems, combining robust stainless steel construction with precision sealing technology. Engineered to API 6D and ASME B16.34 standards, these valves provide bi-directional shut-off and cavity relief capabilities, ideal for applications requiring zero leakage and safety redundancy. The manual operation ensures reliability in remote or power-constrained environments.

II. Key Attribute Parameters

Design Specifications
- Pressure Class: Class 150~Class 2500 (PN16~PN420)
- Bore Range: DN50~DN300 (2″~12″)
- Design Standards: API 6D, ASME B16.34
- Connection Types: Flanged (ANSI B16.5), Butt-Weld (ANSI B16.25)
Material Configuration
- Body/Bonnet: SS304, SS316, SS316L (ASTM A182)
- Disc/Seat: Stellite-faced alloy, PTFE auxiliary seal
- Stem: 17-4PH stainless steel (H900 temper)
- Seal Gaskets: Metal spiral wound (PTFE filler)
Performance Parameters
- Shell Test Pressure: 1.5x rated pressure (2.4MPa for PN16)
- Seal Test Pressure: 1.1x rated pressure (API 598 Class VI)
- Temperature Range: -46℃~427℃ (standard), -196℃~650℃ (special materials)
- Operation Torque: DN100 Class 300 ≤180N·m (handwheel operation)

Product Overview

III. Structural Design & Technical Features

Dual Block and Bleed (DBB) Architecture
- Independent upstream/downstream seats provide two separate sealing barriers, with a middle cavity bleed port to release trapped pressure. This design meets API 6D safety requirements for pipeline isolation.
- Cavity pressure relief valve (set at 1.3x rated pressure) prevents overpressurization during thermal expansion.
Metal-to-Metal Sealing with PTFE Backup
- Stellite 6 hardfaced seats (HRC≥45) ensure long-term wear resistance, while PTFE secondary seals achieve bubble-tight shut-off (leakage rate ≤1×10⁻⁹m³/s).
- Self-energizing seal design adapts to pressure fluctuations, maintaining sealing specific pressure ≥15MPa.
Bolted Bonnet with Pressure Self-Tightening
- Bonnet joint uses stud bolts with spherical washers for uniform preload, while pressure self-tightening gaskets enhance sealing under increasing pressure.
- Anti-blowout stem design (stem diameter ≥1.2x nominal size) prevents accidental dislodgement.

IV. Manufacturing Processes & Quality Control

Precision Forging & Machining
- Valve bodies forged from single-piece stainless steel ingots (forging ratio ≥3), with ultrasonic testing (UT) to ensure no internal defects.
- CNC machining of sealing surfaces to flatness ≤0.005mm, with lapping processes achieving Ra≤0.2μm surface finish.
Heat Treatment & Surface Engineering
- Stem undergoes solution treatment (1040℃) + aging (480℃) for tensile strength ≥1310MPa.
- Seat surfaces treated with HVOF (High-Velocity Oxygen Fuel) spraying for WC-Co coating (thickness 500μm, HV≥1200).
Comprehensive Testing Regime
- 100% hydrostatic shell test (5-minute hold) and pneumatic seal test (15-minute hold).
- Performance verification per API 6D, including 5,000-cycle endurance testing at 1.1x rated pressure.
- Certifications: API 6D Monogram, CE-PED, ISO 9001, NACE MR0175 (for sour service).

Valve Details

THREE-PIECE SPLIT BOLT CONNECTED
The process and instrument pipeline are combined on the same valve body, which is more space-saving, lighter in weight and easier to operate than traditional designs.The DBB series forged ball valve is a one-piece forged construction, with fewer leakage points, and can be used in high pressure and other harsh working conditions.
INTEGRAL FORGED DESIGN
Integral forged design; valve stem anti-pop out structure Double valve design: two ball valves can be opened and closed simultaneously, or can be operated independently Ball valve with elastic valve with compensation function Independent needle valve control drainage function Fire and anti-static structures are optional Three-piece split bolt connected valve body design

V. Core Product Advantages

Advantage Dimension	Technical Details & Value Proposition
Safety Redundancy	DBB structure complies with ISO 14708 safety standards, reducing risk of uncontrolled release by 80% vs. single-seal valves.
Long Service Life	Stellite-faced seats endure 100,000 cycles without wear, 5x longer than conventional steel seats in abrasive media.
Low Maintenance	Self-lubricating stem packing (graphite-impregnated PTFE) reduces maintenance frequency by 60%.
Wide Media Compatibility	316L construction resists chloride stress corrosion (Cl⁻≤20,000ppm), suitable for seawater, crude oil, and chemical solutions.

Application

VI. Application Scenarios

Oil & Gas Transmission
- Onshore Pipeline Mainline: Class 900 valves in natural gas pipelines (10MPa, 60℃), with DBB ensuring safe isolation during pigging operations.
- Offshore Platforms: SS316 valves in subsea manifolds (-20℃), certified by DNV-GL for harsh marine environments.
Refinery & Petrochemical
- Catalytic Cracking Units: Class 2500 valves (42MPa) in high-temperature hydrogen service (427℃), with fire-safe design per API 607.
- LNG Loading Arms: Cryogenic valves (-162℃) with extended bonnets and PTFE/Inconel seals for liquefied natural gas handling.
Power Generation
- Steam Turbine Systems: Class 600 valves (11MPa) in superheated steam lines (350℃), reducing energy loss from leakage by 95%.
- Nuclear Secondary Circuits: 316L valves meeting ASME Section III requirements for radioactive isolation.

Our Strengths

Best Quality Industrial Valve Solutions For You

QUALITY WARRANTY

A warranty of 18 months after delivery or 12 months after installation is provided by TianYu for all supplied valves.

FAST LEAD TIME

General lead time is around 8 weeks(conventional valves) with high efficient production process and regular expedition procedure.

COST-EFFECTIVE PRICE

With A quality but cost-effective supply chain, we offer client with reasonable price and low aftersales cost, to build a healthy and long term partnership.

VALUE ADDED SERVICE

From early bidding to final shipment we have a professional team standby to support client on commercial, technical, quality and transportation issues.

Industrial Applications

Petrochemical Industry

In the petrochemical industry, valves are used to control fluid flow, pressure, and prevent accidents. They are capable of enduring high temperatures and pressures in refinery environments, ensuring safe and smooth operation of processes.

Power Industry

In the power industry, valves are used to control the flow of steam, water, and oil. Globe valves and gate valves in steam pipelines ensure smooth steam transportation, while butterfly valves are commonly used to regulate flow.

Food & Beverage Industry

In the food and beverage industry, valves are used for fluid transportation and control. These valves need to meet sanitary standards to ensure the safety and quality of food products.

Environmental Protection Sector

In the environmental protection sector, valves are used in wastewater treatment systems to control the discharge of sewage, ensuring the effectiveness of wastewater treatment. They play an important role in environmental protection and sustainable development.

Factory Capacity

China Professional Valve Manufacturer & Supplier

Years

Production Equipments

Manufactuing Area

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Annual Production Value

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