1″-1500LB DBB Double Ball Ball Valve

Nominal Size 1″ (DN25)
Pressure Rating Class 1500 (PN250)
Valve Design 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

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TECHNICAL DATA SHEET

Product: DBB Double Block & Bleed Ball Valve
Größe: 1 inch (DN25)
Druckklasse: Class 1500
Design: Double Ball in Series, Integral Body
End Connections: One End NPT (Female) / Opposite End Flanged

Basic Specifications

Parameter	Value
Nenngröße	1″ (DN25)
Druckbewertung	Class 1500 (PN250)
Ventildesign	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)
Temperaturbereich	–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	Körper	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

Parameter	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.

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