Specification

ASME 2500LB Stainless Steel Forged Trunnion Double Block and Bleed Valve

Product Overview

I. Core Product Features

The ASME 2500LB Stainless Steel Forged Trunnion Double Block and Bleed Ball Valve is a premium industrial valve designed for high-pressure, high-temperature, and high-reliability scenarios. With its trunnion-supported structure and Double Block and Bleed (DDB) function, this valve ensures bidirectional sealing and safe pressure relief under harsh conditions. It is widely used in high-pressure pipeline systems across industries such as oil & gas, chemical, and power, particularly in applications requiring online maintenance or emergency shutdowns.

Ball Valve Detail Information:

Ball Valve Optional Material: (for future reference only)

II. Key Attributes and Technical Parameters

(A) Structural and Functional Design

Trunnion-Supported Structure:
The ball is supported by upper and lower trunnions, reducing stem load (operation torque decreased by 30%) and enhancing sealing stability under high pressure. Trunnions and the ball are integrally forged and ultrasonically tested (UT) to ensure no internal defects.

Double Block and Bleed (DDB) Function:
Provides bidirectional bubble-tight sealing (leakage rate ≤5×10⁻¹⁰Pa·m³/s), capable of blocking upstream and downstream media simultaneously while safely releasing cavity pressure through the bleed port. Complies with API 598 Class IV sealing standards, meeting safety requirements for hot work and online maintenance.

High-Pressure Adaptation:
Meets ASME B16.34 standards, with pressure ratings from 150LB to 2500LB (PN16–PN420), supporting a maximum pressure of 42MPa for Class 2500 high-pressure pipeline systems.

(B) Material and Application Compatibility

(C) Key Performance Parameters

Size Range: 1/2″–10″ (DN15–DN250), full-bore design with flow coefficient ≤0.7 (DN100 model);

Operation Modes: Manual (standard handwheel), electric, pneumatic (optional), with manual operation torque ≤200N·m (DN100/2500LB);

Surface Treatment: Polished interior/exterior (Ra≤1.6μm), optional epoxy coating (300μm thickness, 2000-hour salt spray test) for marine applications;

Certifications: ISO 9001, CE-PED, EAC certified, with customization support for API 6D, NACE MR0175 (sulfur-resistant), etc.

III. Manufacturing Processes and Standards

(A) Precision Forging Technology

Integral Forging:
Body and ball forged using a single-piece die (forging ratio ≥5:1) on a 2000-ton press, achieving ASTM No.8+ grain size for uniform material density and 40% improved impact resistance.

High-Precision Machining:

5-axis CNC machining centers mill seat sealing surfaces to ≤0.003mm flatness and Ra≤0.8μm roughness;

Ball ground with CNC grinders to ≤0.005mm roundness, ensuring ≤0.01mm fit clearance with seats for zero-leakage sealing.

(B) Full-Process Quality Control

Pressure Testing:

Strength Test: 1.5x rated pressure (water, 30-minute hold) with no deformation or leakage;

Seal Test: 1.1x rated pressure (gas/water), bidirectional testing with leakage rate ≤0.1cc/min;

Cryogenic Test: Operation tested at -46℃ to ensure reliability in low-temperature conditions.

Nondestructive Testing:

100% ultrasonic testing (UT) for body and trunnions, sensitivity ≥Φ1.2mm;

Radiographic testing (RT) for welds, compliant with ASME BPVC Section VIII.

Features:

Piping and instrument valves in one body
Weight, space and cost saving over traditional designs
Blowout-proof valve stems and needles
Complete traceability of materials
1/4 female NPT standard vent with plug
1/2 female NPT standard outlet with plug

Details:

1.Maximum working pressure:6000 psig
2.Working temperature up to 1200°F ( 649°C ) with Graphite packing
3.Colour coded valve function identification
4.Fire-tested design in accordance with BS 6755 part 2
5.Flanged connections comply with ANSI B16.5 RF and RTJ
6.Pressure ratings in accordance with ANSI B16.34

7.Every design is hydraulic pressure tested in accordance with EN 12266-1 and API   598
8.Every set is tested with nitrogen for leak-tight performance at 6000 psig