Full Bore Carbon Steel Worm Gear Trunnion Welded Ball Valve for Thermal

TIANYU Full-Bore Carbon Steel Worm Gear Gate Valve: Efficient Control Solution for Industrial Pipeline Systems

I. Technical Overview

II. Core Product Features

(A) Full-Bore Design Advantages

• Unobstructed Flow Path: Valve ID matches pipeline ID for zero restriction, reducing turbulence and pressure loss, lowering pump power demand;
• Anti-Clogging Capability: Smooth flow path without steps or dead corners prevents particle deposition, ideal for industrial wastewater with suspended solids;
• Flow Characteristics: Equal percentage flow curve with ±5% regulation accuracy, outperforming conventional gate valves’ ±10%.

(B) Worm Gear Drive System

• Torque Amplification: Worm gear reduction ratio 1:10~1:40 reduces operating torque by 70%, with DN300 valve requiring ≤120N force;
• Precision Control: Worm gear self-locking prevents misoperation, positioning accuracy ±0.5°, suitable for frequent adjustment;
• Protection Class: Cast aluminum housing with powder coating, IP67 protection for long-term use in wet, dusty environments.

(C) Pressure Sealing Structure

III. Key Technical Attributes

IV. Manufacturing Processes & QC

(A) Precision Casting & Machining

1. Body Forming:
   • Resin sand casting with ±1mm wall thickness uniformity, UT-tested for internal defects (sensitivity ≥Φ2mm);
   • High-temperature annealing to relieve stress, hardness controlled at HB120-180.
2. Disc Machining:
   • CNC gantry milling for sealing face with flatness error ≤0.05mm, surface roughness Ra≤1.6μm;
   • STL hard alloy overlay thickness ≥2mm, uniform metallographic structure without cracks.
3. Assembly Process:
   • Stem straightness ≤0.05mm/m, connection gap with disc ≤0.03mm;
   • 1.5x nominal pressure hydrostatic test (15-min hold), 1.1x air pressure seal test (leakage ≤0.1NL/min) for each valve.

(B) Quality Assurance System

• Material Traceability: Key components traceable to melt heat number and heat treatment records, with chemical composition reports (third-party PMI testing);
• Life Testing: Sampled for 10,000 cycles with ≥98% sealing retention (industry standard: 5,000 cycles);
• Surface Treatment: Valve body sandblasted to Sa2.5, epoxy coating thickness ≥200μm, 1000-hour salt spray test without corrosion.