Welded Gate Valve
공칭 직경：1/2”-36”(DN15-DN900)
공칭 압력：클래스150-클래스2500(1.0MPa-320MPa)
최대 작동 온도:425℃
쉘 소재：CF3，CF3M，CW6MC，N06625，N10276，WCB，WCC，CF8，CY40，M35-1，A105，F304，F316，F316L，CF8M，모넬 K500，인코넬 718
설계 기준: API 600, ISO 10434, ASME B16.34, GB/T 12234, EN 10434, DIN 3352, JIS B2032
연결: Welding
드라이브 모드수동, 전기, 공압, 유압
Welded Gate Valve
제품 정의 및 안전 임무:
The Welded Gate Valve is a core component for achieving permanent seals in high-temperature, high-pressure pipeline systems, eliminating the leakage risks and maintenance challenges of flanged valve connections. This heavy-duty welded gate valve provides a lifetime maintenance-free sealing solution for demanding applications such as energy and chemical industries through a permanent welded connection.
JH Welded Gate Technology Core
- All-welded valve body → Leakage risk approaches zero (based on a novel all-welded flat gate valve design)
- High-pressure seal → Pressure rating Class 150-2500 (ASME B16.34)
- High temperature adaptability → Applicable temperature range: -196℃ to 650℃ (ASME B16.34)
- Lifetime maintenance-free → Design life ≥ 40 years (API 598)
- 제품 기술 분석
- Socket Welding（SW）
- Butt Welding（BW)
Industrial-grade welded gate valves are based on the concept of permanent connection and structural integrity. The valve body is made of integral forging or precision casting (ASTM A216 WCB), and a permanent connection to the pipeline is achieved through automated welding processes (such as valve welding equipment). The sealing system adopts a flexible wedge gate design (such as the flexible wedge gate valve mechanism), which compensates for valve body shrinkage through the elastic deformation of the gate under thermal fluctuation conditions, eliminating heat binding. The guiding system is equipped with four guide rails for precision guidance, ensuring that the gate maintains a centering accuracy of ±0.1mm after 30,000 operations. The welded ends are processed according to ASME B16.25 standards, and with post-weld heat treatment and 100% non-destructive testing, the operational reliability is achieved with the same lifespan as the pipeline.
Socket welding forms fillet welds, providing a compact solution for small-diameter high-pressure pipelines and eliminating connection leakage problems under high-pressure conditions.
핵심 디자인:
▌ Design of fillet welds → Weld height ≥ pipe wall thickness (ASME B16.11) | Root gap ≤ 0.8mm (GB/T 14383)
▌ Small Diameter Optimization → Applicable Pipe Diameter ≤ DN40 (GB/T 14383) | Weight Reduction of 35%
▌ High Pressure Bearing → Socket Reinforcement Structure (GB/T 14383) | Pressure Bearing Capacity Increased by 50%
▌ Precision alignment → Mould depth tolerance ±0.5mm (GB/T 14383) | Prevents misalignment and deformation
Butt welds form a butt weld with matching strength, providing a reliable connection with the same strength as the pipe for large-diameter pipelines.
핵심 디자인:
▌ Full penetration welding → Groove angle 37.5°±2.5° (ASME B16.25) | Blunt edge thickness 1.6±0.1mm
▌ Equal strength design → Weld coefficient = 1.0 (ASME B31.3) | Pressure rating same as piping
▌ 비파괴 검사 → 100% radiographic testing (ASTM E94) | Defect rate ≤0.01%
▌ Stress relief → Post-weld heat treatment (API 6D) | Residual stress ≤100MPa
핵심 설계 및 장점
- Zero-leakage permanent connection: The Welded Gate Valve adopts an all-welded structure → leakage risk approaches zero | Eliminating flange leakage and achieving a lifetime seal.
- High Pressure Equal Strength: Butt-welded are based on full penetration welds → Weld Coefficient = 1.0 (ASME B31.3) | Pressure rating is the same as the pipeline, exceeding pressure limits.
- Intelligent thermal compensation: Flexible wedge gate valve elastic deformation → compensation amount ±1.5mm | Eliminates heat binding and ensures high-temperature sealing.
- Compact Space Optimization: Flangeless Design for Socket Welded Gate Valves → Installation Length Reduced by 40% | Overcoming Space Bottlenecks and Expanding High-Pressure Applications
- Ultra-smooth operation: Low-friction guide and precision linkage → Operating torque ≤80 Nm (ISO 5211) | 300% longer service life, eliminating jamming.
- Lifetime maintenance-free: All-welded structure and high-grade materials → Design life ≥ 40 years | Maintenance costs reduced to zero, completely eliminating the burden of maintenance.
기타 제품
FAQ-Welded Gate Valve
Welded Gate Valves form permanent connections with pipeline systems through welding, bringing significant advantages. Their excellent sealing performance completely eliminates leakage risks that may exist in flanged connections, making them particularly suitable for handling toxic, hazardous, or valuable media. More compact structure saves installation space, especially suitable for space-constrained applications. Higher reliability enables them to withstand higher pressures and temperature fluctuations, while better economy is reflected in no need for maintenance of connection components during long-term operation, reducing lifecycle costs.
Butt Weld (BW) and Socket Weld (SW) are two main connection types for Welded Gate Valves. Selection should consider the following factors:
Butt Weld Connections: Suitable for large diameter pipelines, high pressure and temperature conditions, providing higher connection strength and better flow characteristics
Socket Weld Connections: More appropriate for small diameter pipelines, space-constrained applications, with relatively easier installation
Media Characteristics: Socket welds may have crevice corrosion risks, requiring careful selection for corrosive media
Inspection Requirements: Butt weld joints typically require non-destructive testing with higher quality requirements
Maintenance Considerations: Socket weld valves are relatively easier to replace, while butt weld connections are more permanent
The following key parameters require emphasis when selecting Welded Gate Valves:
Design Pressure and Temperature: Maximum working pressure and temperature range
Weld End Standards: BW or SW end dimensions and bevel forms
Body Material: Compatibility with pipeline materials and weldability
Media Characteristics: Corrosiveness, toxicity, flammability, etc.
Welding Process: Required welding methods and heat treatment requirements
Inspection Standards: Non-destructive testing methods and acceptance criteria
Special attention is required during Welded Gate Valve installation:
Pre-welding Preparation: Strictly follow specifications for bevel processing and cleaning
Alignment Accuracy Control: Ensure precise alignment between valve and pipeline, avoiding misalignment
Welding Heat Protection: Take effective measures to protect internal valve seals
Welding Process Control: Strictly implement welding procedure specifications and parameters
Post-weld Treatment: Perform post-weld heat treatment and non-destructive testing as required
Quality Records: Establish complete welding quality record system
Maintenance of Welded Gate Valves requires special consideration of their permanent connection characteristics:
Regular Function Testing: Verify valve operation performance and sealing capability
External Condition Inspection: Check external corrosion and damage conditions
Operating Mechanism Maintenance: Maintain proper lubrication of stem and operating mechanism
Sealing Performance Monitoring: Judge sealing status through system pressure changes
Preventive Maintenance: Develop time-based preventive maintenance plans
Failure handling for Welded Gate Valves需要考虑 their non-removable characteristics:
Online Repair: Prioritize online repair solutions to avoid pipeline cutting
Professional Assessment: Professional personnel should conduct failure assessment and develop repair plans
Special Tools: May require specialized tools for online repair operations
System Impact: Assess the impact of repair work on system operation
Quality Control: Strict quality verification must be performed after repair
Welded Gate Valves can fully utilize their advantages in the following working conditions:
High-risk Media: Transportation of toxic, flammable, explosive, or valuable media
High Pressure and Temperature Systems: Applications requiring withstanding extreme pressures and temperature fluctuations
Space-constrained Locations: Installation spaces with limited room where flanged connections cannot be used
Long-term Operation Systems: Pipelines requiring maintenance-free or minimal maintenance long-term operation
Harsh Environments: Working conditions with vibration, shock, or corrosive environments
Our Welded Gate Valves support a complete certification system including CE, ISO 9001, API 6D, ABS (American Bureau of Shipping), BV (Bureau Veritas), CCS (China Classification Society), fire safety certifications, and specific industry certifications.