Double Block&bleed Ball Valve Trunnion

Double Block&bleed Ball Valve Trunnion is a valve with double closure and pressure relief function, it adopts two seat sealing surface design, in the closed position, by releasing the valve cavity between the two sealing surfaces, can resist the pressure from both ends of the valve. The Trunnion (fixed ball) design enables the ball to have a stable central position under high pressure, ensuring good valve performance.

The Main Characteristics of the DBB Valve:

1. Double seal design: The DBB double ball valve has two seat sealing surfaces to form a double barrier in the closed position to ensure that the medium does not leak.

2. Drain function: The valve cavity is provided with a drain interface for discharging the residual medium or pressure in the cavity for easy cleaning and maintenance.

3. High strength structure: high strength integral club structure, to ensure that the ball has the correct center position under high pressure, improve the stability and reliability of the valve.

4. Anti-static device: the valve cover is in effective contact with the ball lever, equipped with superior anti-static device to ensure safe operation.

5. A variety of sealing materials: sealing surface materials are usually made of high-quality materials such as PTFE, etc., to ensure the sealing performance of the valve in the closed state.

6. Various driving modes: manual, electric, pneumatic and other driving modes can be equipped to meet different operating requirements.

VALVE DESIGN

API 6D, API 6A, ASME B16.34, ISO 14313, ISO 10423, ISO 17292

TEMPERATURE RANGE

-58 to 392°F (-50 to 200°C)

SIZE

NPS 1-12 (DN 25-300)

PRESSURE RATING

ASME 150 - ASME 2500

FACE-TO-FACE

As per API 6D standard

END CONNECTIONS

RF, RTJ as per B16.5 &B16.47
BW, Butt Welded as per B16.25
SW, Socket Welded as per B16.11

MATERIALS

Low Temperature and Low Alloy Carbon Steel

Stainless steel, Duplex and Super Duplex

Nickel alloys, Titanium

BODY DESIGN

Forged and casting bolted two-piece and three-piece

SEAT DESIGN

Soft or metal seated with Hard facing on ball and seats
Double piston seats
Combination seats

FEATURES

Double block and bleed design (DBB)
Secondary seals in pure Graphite
Anti-Static Device
Anti Blow out stem
Emergency sealant injection on seats and stem available
Low fugitive emission stem packing available
O-ring /Lip seals and Graphite configuration
CRA overlay on all dynamic sealing areas or on all wetted parts available
Extended bonnet for low & high temperature available

OPERATOR

Manual: wrench or Gear with padlocking
Actuated: Pneumatic/ Hydraulic/Electric

TESTING & CERTIFICATIONS

Compliance with API 6D & ISO 5208 & API 598 inspection and testing
Fire safe and fire tested as per API 607
SIL 3 Certification as per IEC61508
Fugitive Emission as per ISO15848
PED 2014/68/UE

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