Product Overview

The Pneumatic Trunnion Mounted Ball Valve is designed for high-pressure, large-diameter, and continuous-duty pipeline systems where stable sealing performance, predictable torque behavior, and reliable automated operation are required.
Unlike floating ball valve designs, the ball is mechanically supported by upper and lower trunnion bearings, which stabilize the valve core and transfer pipeline load directly to the valve body structure instead of the seat rings. This design helps maintain consistent operating torque across pressure variations and reduces mechanical stress on sealing components.
This structure makes the valve particularly suitable for automated process systems where repeatable cycling performance and long service intervals are critical.

Trunnion Mounted vs Floating Ball Valve

Feature	Floating Ball Valve	Trunnion Mounted Ball Valve
Ball Support	Floating under line pressure	Fixed via upper & lower trunnion bearings
Operating Torque	Increases significantly with pressure	Stable and relatively low across pressure range
Seat Load	High pressure load on seats	Load absorbed by mechanical structure
Wear Behavior	Faster seat wear under high pressure	Reduced seat stress and improved lifespan
Automation Suitability	Limited in large/high-pressure sizes	Well-suited for pneumatic/electric automation

Key Engineering Features

Stable Low Operating Torque for Automation Systems
The trunnion-supported structure reduces friction between ball and seat during operation, allowing more stable torque output.
Engineering Benefit:

Enables smaller pneumatic actuator sizing in many configurations
Improves cycle repeatability in automated control systems
Reduces instrument air consumption in frequent cycling applications

Bidirectional Sealing & DBB Capability (Optional Configuration)
Seat rings are designed with spring-loaded and pressure-assisted sealing structures to maintain sealing performance in both flow directions.
Optional Function: Double Block and Bleed (DBB)
Used in isolation systems requiring verification of zero leakage between upstream and downstream lines.

Reduced Seat Stress & Extended Service Life
The trunnion structure absorbs mechanical loading from pipeline pressure, minimizing direct compression on soft or metal seats.
Resulting Benefit:

Reduced seat deformation risk under high differential pressure
Extended maintenance interval in continuous operation systems

Emergency Sealant Injection System (Optional)
For severe service applications, stem and seat injection ports can be configured.
Function:
Allows temporary sealing enhancement in case of minor leakage without immediate system shutdown, supporting maintenance planning in continuous process industries.

Anti-Static & Fire-Safe Design (Optional Certification)
Designed for flammable and hazardous media applications.

Anti-static grounding between ball, stem, and body
Fire-safe secondary metal sealing structure

Testing Standards (upon request):

API 607 (Fire Test for Soft-Seated Valves)
API 6FA (Fire Test for Valves)

Materials of Construction

Material selection is based on pressure class, temperature, and media characteristics.
Carbon Steel (Cast): ASTM A216 WCB / WCC Suitable for general oil, gas, and industrial fluid systems
Carbon Steel (Forged): ASTM A105 / A105N Used for higher pressure and critical pipeline systems
Stainless Steel: ASTM A351 CF8 / CF8M Suitable for corrosive media environments
Duplex Stainless Steel (Optional):Suitable for seawater, chloride-containing, and offshore applications
Manufacturing Control:
All components are machined under controlled CNC processes to ensure:

Consistent sealing geometry
Stable torque performance
Interchangeability of spare parts

Inspection, Testing & Quality Assurance

All valves undergo 100% factory testing prior to shipment.
Standard Testing Procedures:

Shell Test: API 598 / ISO 5208

Verifies pressure containment integrity

Seat Leakage Test: API 598 / API 6D

Verifies sealing performance under differential pressure

Air Pressure Test: Bubble-tight verification

Confirms low-pressure sealing reliability
Third-Party Inspection (Optional):
SGS / TÜV / BV / DNV inspections can be arranged upon request for international projects.

Available Sizes & Pressure Ratings

Size Range	DN50 – DN1200 (2" – 48")
Pressure Class	ANSI Class 150 / 300 / 600 / 900 / 1500 / 2500
Connection Types	RF / RTJ / BW (Butt Weld)
Design Standards	API 6D / ASME B16.34 / ISO 17292

(Custom specifications available for project requirements)

Application Industries

Oil & Gas transmission pipelines
Refinery and petrochemical plants
LNG storage and distribution facilities
Power generation auxiliary systems
Industrial automation and high-pressure fluid networks

What Wholesale Buyers & EPC Contractors Care About

01/

Consistent Batch Quality
All production is controlled under standardized CNC machining systems to ensure dimensional consistency across batches.

02/

Actuator Compatibility (ISO 5211 Standard)
Top mounting interface conforms to ISO 5211, allowing direct installation of:

Pneumatic actuators
Electric actuators
Hydraulic actuators

Without additional custom brackets in most configurations.

03/

OEM / ODM Engineering Support
We support:

Customized face-to-face dimensions
Branding and nameplate customization
Engineering drawing adaptation for project bidding

04/

Lifecycle Cost Optimization
The design focuses on reducing:

Actuator sizing requirements
Seat replacement frequency
Maintenance downtime

Resulting in improved total lifecycle cost performance in automated pipeline systems.

Typical Engineering Project Applications

Middle East gas transmission pipeline projects (high-pressure isolation systems)
Southeast Asia LNG terminal distribution systems
Petrochemical refinery expansion projects in industrial zones
Power plant auxiliary high-pressure steam systems

FAQ

Q: What is the main advantage of trunnion mounted ball valves?

A: They provide stable torque behavior under high pressure and reduce seat loading by transferring mechanical forces into the valve structure, making them more suitable for large-diameter and automated systems.

Q: Why are they preferred for pneumatic actuation?

A: Because torque remains stable regardless of pressure changes, actuator sizing becomes more predictable and cost-efficient, improving system reliability in automated operations.

Q: What standards do your valves comply with?

A: Design and testing can be provided according to:
API 6D, API 598, ASME B16.34, ISO 17292, and fire-safe standards such as API 607 / API 6FA (upon request).

Q: Can you customize valves for EPC projects?

A: Yes. We support customized:
Pressure class
End connection standards
Face-to-face dimensions
Material selection

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