Product Overview

The bi-directional flanged trunnion mounted ball valve is designed for reliable shut-off in high-pressure, large-diameter pipeline systems.
Compared with floating ball valves, the trunnion-mounted structure supports the ball at both upper and lower trunnions, which reduces operating torque and improves sealing stability under high differential pressure conditions.
This valve is commonly used in:

Oil & gas transmission pipelines
Refinery and petrochemical plants
Gas distribution and compressor stations
Tank farms and custody transfer systems

Manufacturing standards include:

API 6D (Pipeline valves)
ASME B16.34 (Valve design)
ISO 17292 (Ball valves)

Design Features

01/

Trunnion Mounted Structure
The ball is mechanically supported by upper stem and lower trunnion bearings.
Engineering function:
Reduces friction between ball and seat
Stabilizes sealing under high pressure differential
Prevents seat deformation in large diameters (DN150 and above)

02/

Bi-Directional Sealing System
Spring-loaded seats are designed to maintain contact with the ball regardless of flow direction.
Function:
Upstream or downstream pressure can achieve sealing
Suitable for reversible pipeline conditions
Reduces installation orientation risk

03/

Flanged End Connection
Flanges are manufactured according to:
ASME B16.5 / B16.47
EN 1092-1 / DIN standards
Benefit:
Compatible with global pipeline systems
No welding required during installation
Suitable for modular EPC projects

04/

Double Block and Bleed (DBB)
When closed, both seats seal independently and the cavity can be vented through a drain/bleed connection.
Function:
Verifies sealing integrity
Safely releases trapped cavity pressure
Supports maintenance isolation procedures

05/

Fugitive Emission Control
Stem sealing can be configured with graphite packing and secondary sealing elements.
Available compliance options:
ISO 15848-1 (Low emission design)
TA-Luft (optional configuration)

06/

Fire-Safe Design
Designed with metal backup sealing to maintain partial sealing after fire exposure.
Complies with:
API 607
API 6FA

07/

Low Operating Torque Design
Optimized trunnion bearings and seat geometry reduce friction during operation.
Result:
Lower actuator torque requirement
Smaller pneumatic or electric actuator selection possible

Technical Specifications

Item	Specification
Size Range	DN50 – DN1200 (2" – 48")
Pressure Rating	ASME Class 150 – 2500
Temperature Range	-46°C to +200°C (depends on seat material)
Body Materials	WCB / LCB / CF8 / CF8M / Duplex / Alloy steels
Ball Materials	A105+ENP / F316 / Duplex / Hard-coated options
Seat Materials	PTFE / RPTFE / PEEK / Metal seated (TC / Stellite)

Material Selection

Standard Service

Carbon steel body (WCB/WCC)
ENP coated ball
PTFE or RPTFE seats

Low Temperature Service

ASTM A352 LCB / LCC
Cryogenic-tested sealing system

Corrosive / Offshore Service

Stainless steel (CF8M / 316)
Duplex / Super Duplex options

Severe / Abrasive Service

Tungsten carbide / Stellite coated trim
Metal-to-metal sealing

Testing & Quality Control

Each valve is tested before shipment according to:
API 598 pressure testing
ISO 5208 leakage testing (Class A for soft seat)
Hydrostatic shell and seat tests
Low-pressure air seat test
Torque verification for actuator matching

Documentation available:
EN 10204 3.1 Material Certificates
Factory test reports
Third-party inspection available on request

Application Areas

Crude oil and refined product pipelines

LNG and natural gas transmission systems

Refinery process isolation systems

Chemical and petrochemical plants

Storage tank inlet/outlet lines

Compressor station isolation

Procurement Information

To support EPC and distributor procurement, the following options are available:
Custom pressure class and size configuration
Actuated packages (pneumatic / electric / hydraulic)
Fire-safe and low-emission certification options
Customer-approved GA drawings before production
OEM branding available
Typical lead time:
Standard configuration: 4–8 weeks (depending on size and quantity)
Inspection:
Factory inspection available
Third-party inspection supported
Warranty:
Typically 12–24 months (depending on contract terms)