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
Kích cỡ: 1 inch (DN25)
Cấp áp suất: Class 1500
Design: Double Ball in Series, Integral Body
End Connections: One End NPT (Female) / Opposite End Flanged

Basic Specifications

Tham số	Value
Kích thước danh nghĩa	1″ (DN25)
Xếp hạng áp suất	Class 1500 (PN250)
Thiết kế van	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)
Phạm vi nhiệt độ	–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	Thân hình	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

Tham số	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	Tiêu chuẩn
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.

CAM KẾT:

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