Product Overview

The High Temperature Forged Steel Trunnion Ball Valve is designed for industrial pipeline systems operating under high pressure, high temperature, and continuous duty conditions. It is widely applied in oil & gas transmission, refinery processing, petrochemical systems, and high-temperature utility pipelines.
Compared with cast steel ball valves, this product uses a forged steel valve body, which improves structural density and reduces internal casting defects such as porosity, shrinkage cavities, and micro-cracking. This structural difference is critical in applications where long-term thermal cycling and pressure stability are required.
The valve is engineered for buyers who require stable sealing performance, predictable maintenance cycles, and compliance with international pipeline valve standards.

Technical Specifications

Pressure & Temperature Range
Pressure Classes: ASME Class 150 / 300 / 600 / 900 / 1500 / 2500
Size Range: 2" – 48" (DN50 – DN1200)
Temperature Range:
Standard seat: Up to 200°C
Reinforced seat (RTFE / PEEK): Up to 300°C+
Metal seat: Up to 400°C+ (depending on media and design)

Design Standards
API 6D (Pipeline Valve Standard)
ASME B16.34 (Pressure-Temperature Ratings)
ISO 5208 (Leakage Testing Classification)
Fire-safe design available per API 607 / API 6FA (optional)
NACE MR0175 / ISO 15156 (sour service option)

Structural Design Features

01/

Forged Steel Valve Body
The valve body is manufactured from forged steel instead of cast steel.
Engineering basis:
Forging refines grain structure and improves directional strength
Eliminates common casting defects (porosity, shrinkage cavities)
Improves resistance to thermal fatigue under repeated heating and cooling cycles
Procurement impact:
This reduces the risk of leakage caused by long-term structural deformation in high-temperature pipeline service.

02/

Trunnion-Mounted Ball Structure
The ball is mechanically supported by upper and lower trunnions.
Functional principle:
Pressure load is transferred directly to trunnion bearings rather than seat sealing surfaces
Ball remains stable under high differential pressure conditions
Engineering benefit:
Reduces seat wear compared to floating ball designs
Ensures stable torque even in large diameter valves

03/

High-Temperature Seat System
Seat material is selected according to service temperature and media conditions:
Reinforced PTFE (RTFE): moderate high temperature service
PEEK / engineered polymers: higher temperature and wear resistance
Metal seated design: extreme temperature or abrasive service conditions

04/

Anti-Blowout Stem Design
The stem is retained inside the valve body by a mechanical shoulder structure.
Function:
Prevents stem ejection under internal pressure
Ensures operator safety in pressurized systems

05/

Anti-Static System
A conductive path is provided between ball, stem, and body.
Purpose:
Prevents static electricity accumulation during fluid flow
Reduces ignition risk in flammable media pipelines

06/

Fire-Safe Design (Optional)
When required, the valve can be designed to maintain controlled leakage under fire exposure conditions.
Reference standards:
API 607 / API 6FA

Performance Testing & Quality Control

Each valve undergoes controlled inspection and testing prior to shipment:

Shell hydrostatic pressure test
Seat leakage test (API 6D / API 598 requirement basis)
Torque measurement for operational consistency
Dimensional inspection using CNC metrology
Non-destructive testing (UT / RT) for forged components (project dependent)

Material Traceability System
Each production batch is traceable through:

Heat number tracking
Material Test Certificate (MTC EN10204 3.1 available)
Manufacturing process records

Industrial Applications

This valve is typically used in systems where shutdown reliability directly affects process safety and production continuity:

Crude oil and refined product pipelines
Refinery process isolation systems
Petrochemical high-temperature fluid lines
Steam and thermal oil distribution systems
Power plant auxiliary pipeline systems
LNG-related non-cryogenic support systems (material dependent)

Engineering Problems This Valve Is Designed to Solve

Leakage under thermal cycling conditions
Forged body structure reduces deformation risk caused by repeated heating and cooling cycles in high-temperature pipelines.

Excessive torque in large diameter valves
Trunnion-mounted design reduces friction between ball and seat, resulting in more stable torque values across full pressure range.

Short service life of soft-seated valves in high temperature service
Reinforced seat materials reduce creep deformation and maintain sealing contact stability over longer operating periods.

Procurement inconsistency in large projects
Controlled machining and batch traceability ensure consistent geometry and performance across bulk orders for EPC projects and distributors.

Manufacturing Quality System

Production is controlled under a structured quality system including:

CNC machining of sealing surfaces with controlled tolerance
Batch-level material certification and traceability
Assembly torque calibration for actuator compatibility
Pressure testing on 100% of finished valves (standard configuration)
Optional third-party inspection (TPI: SGS / BV / TUV)

Value for Wholesale & EPC Buyers

Stable batch consistency for large project procurement
Compatible with international engineering specification requirements
Reduced maintenance and lifecycle replacement cost
OEM customization available (pressure class, seat, end connection, actuator interface)
Full technical documentation support for project approval processes
Suitable for distributor stocking and multi-project supply chains

FAQ

Q: Why is forged steel preferred over cast steel in high-temperature valves?

A: Forged steel has a more uniform grain structure and significantly fewer internal defects compared to cast steel. This improves fatigue resistance and reduces the risk of leakage under thermal cycling and high-pressure conditions.

Q: What is the advantage of a trunnion-mounted ball design?

A: The trunnion structure supports the ball mechanically, reducing load on the seat. This results in lower operating torque, reduced seat wear, and improved stability under high differential pressure.

Q: What temperature can this valve handle?

A: Depending on seat selection:
Soft reinforced seats: up to approximately 300°C
Metal-seated configurations: up to 400°C or higher (application dependent)

Q: Does the valve comply with international standards?

A: Yes. The design typically follows API 6D, ASME B16.34, ISO 5208, with optional compliance to API 607 fire-safe and NACE MR0175 sour service requirements.

Q: Can this valve be used with automation systems?

A: Yes. The valve is designed for actuator mounting compatibility (ISO 5211 interface), suitable for electric, pneumatic, or hydraulic actuators.

Q: Do you support OEM and bulk orders?

A: Yes. The valve can be customized for pressure class, material grade, seat type, end connection, and actuator interface to meet EPC project requirements.

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