The A105 gate valve is a high-performance shutoff valve with a valve body and key components made of A105 forged steel. Designed for demanding operating conditions, its core features are as follows:
1. Core Material Characteristics
A105 Material Definition
This carbon steel forging complies with ASTM and GB/T12228 standards. Its low carbon content (C ≤ 0.35%) ensures excellent weldability, and its manganese content of 0.6% to 1.05% enhances mechanical strength.
With a tensile strength of ≥485 MPa, its overall performance surpasses that of ordinary No. 20 steel and is suitable for non-corrosive media (water, steam, and oil).
Forging Process Advantages
Forgings offer high density, are free of casting porosity defects, and offer significantly improved pressure-bearing capacity (up to 42 MPa).
They resist pipeline water hammer and vibration fatigue, extending their service life by over 30% compared to cast steel valves.
2. Typical Structure and Performance
1. Key Design
| Components | Features |
|---|---|
| Bonnet connection | Bolted (wound-wound gasket seal) | Welded (fully welded explosion-proof) | Self-sealing (high-pressure self-tightening) |
| Gate flat type | Rigid wedge (resistant to high pressure shock) | Elastic wedge (compensates for temperature deformation) |
| Sealing | Hard alloy cladding (such as tungsten-cobalt alloy) is resistant to particle erosion and meets ANSI Class VI zero leakage standards. |
2. Outstanding Performance
High-Pressure and High-Temperature Resistance: Suitable for temperatures from -29°C to 550°C (steam/thermal oil), with pressure ratings ranging from 150 lbf to 2500 lbf.
Low-Resistance Design: When fully open, the flow path is straight, with near-zero pressure loss, making it suitable for high-flow pipelines.
Easy Maintenance: Self-sealing bonnet allows for packing replacement without disassembling the valve body.
3. Core Application Scenarios
Energy Industry
Main steam pipelines for thermal power plants (PN320, 540°C high temperature);
Shut-off valves for long-distance natural gas pipelines (resistant to hydrogen sulfide corrosion);
Harsh Operating Conditions
High-pressure reactors for oil cracking units (32MPa operating conditions);
Marine power systems (salt spray corrosion resistant, meeting marine standards)