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| The High-Pressure Welded Gate Valve is a severe-service fluid isolation solution precision-engineered for the most punishing, high-temperature, and ultra-high-pressure industrial environments. Designed primarily for fully open or fully closed isolation duties, this robust valve guarantees dependable, positive shutoff with minimum flow restriction and exceptionally low pressure drops across high-velocity line networks.It is designed for reliable isolation in high-pressure and high-temperature applications. Constructed from alloy steel (20CrMo) or stainless steel, it features a robust body structure with excellent resistance to corrosion and thermal stress. Available in sizes from DN50 to DN200 and pressure ratings up to PN320 (Class 2500), this valve complies with GB/T 12235 and is suitable for ultra-high-pressure water, steam, and oil services at temperatures up to 550°C. Ideal for power plants, petrochemical facilities, and critical industrial systems. | |||||||||
Self-Tightening Pressure-Seal Design: Leverages high internal system pressure to optimize body-bonnet joint tightness, completely eliminating the leakage vulnerabilities typical of conventional bolted flanges at high temperatures.
Hermetic Butt-Welded Connections: Permanently welds directly into the pipeline network, ensuring a 100% leak-proof piping matrix while significantly reducing the total dead-weight of the valve cluster.
Erosion-Resistant Stellite Hardfacing: Seating surfaces feature a heavy overlay of cobalt-base alloy, resisting severe steam wire-drawing, fluid impingement, and thermal binding under high differential pressures.
Non-Rotating Guided Stem Matrix: The rising stem travels along a strictly vertical, non-rotating path, minimizing friction and material wear on the die-formed flexible graphite packing to strictly contain fugitive emissions.
High-Torque Automation Ready: Features an integrated heavy-duty top mounting flange coupled with a high-performance actuator (as shown in file image_b17246.png) for seamless automated emergency isolation.
This high-pressure welded gate valve is explicitly tailored for heavy industrial plants requiring absolute operational safety under critical parameter configurations handling ultra-high-pressure water, superheated steam, and thermal hydrocarbon oils.
Primary Applications Include:
Thermal Power Generation: Superheated main steam lines, high-pressure boiler feed-water loops, and critical turbine extraction systems.
Petrochemical & Refining Facilities: High-pressure hydrocracking units, catalytic reforming systems, and thermal oil transfer headers.
Critical Industrial Systems: High-pressure chemical synthesis loops, coal gasification utility lines, and high-parameter hazardous fluid isolation networks.
Parameter Item | Standard Specifications / Values |
Design & Manufacturing Standard | GB/T 12235 / ASME B16.34 |
Pressure-Temperature Rating | GB/T 12224 / ASME B16.34 |
Face-to-Face Dimensions | GB/T 12221 / Manufacturer Standard |
Butt-Welding End Connections | GB/T 12224 / ASME B16.25 (Matching pipeline schedule) |
Inspection & NDT Testing | GB/T 13927 / API 598 / Radiographic & Ultrasonic NDT |
Nominal Size Range Scope | DN50 to DN200 (As indicated in file |
Nominal Pressure Ratings | Up to PN320 / ASME Class 1500 / Class 2500 |
Body & Bonnet Material Matrix | Alloy Steel 20CrMo, 12Cr1MoV / Forged Stainless Steel 304, 316 |
Internal Trim Hardfacing | Full Stellite Co-Cr Alloy Overlay (API Trim No. 5) |
Stem Packing Assembly | Die-Formed Flexible Graphite with Inconel Wire Reinforcement |
Maximum Service Temperature | Rated up to 550°C (Based on alloy structural matrix) |
Operator Configuration | High-Torque Electric Actuator (Shown in file |
Metallurgical Selection for Creep Resistance: For continuous steam or hydrocarbon oil operations between 425°C and 550°C, the 20CrMo alloy steel body execution specified in file image_b17246.png is highly critical. It offers exceptional creep rupture strength and thermal fatigue resistance compared to standard carbon steels. For highly corrosive chemical media, stainless steel options should be substituted.
Precise Piping Schedule Matching: Because these valves are permanently butt-welded into the line, users must accurately specify the wall thickness profile (e.g., Sch 160, XXS) of the connecting pipe during ordering. This guarantees a perfect match for the field weld bevel and ensures optimal weld-joint penetration.
Automated Actuator Sizing: Given the enormous frictional forces generated on the wedge under a PN320 differential pressure, manual operation can be extremely difficult. It is highly recommended to utilize the integrated Electric Actuator setup shown in file image_b17246.png to guarantee swift, reliable closure during emergency system isolations.
Strictly Prohibit Throttling: Welded gate valves must strictly operate in either the fully open or fully closed state. Utilizing the gate to throttle or regulate fluid volume will focus high-velocity fluid wear onto the lower section of the wedge, causing severe seat chattering, erosion, and irreversible sealing failure.
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
