Description
Welded Double Seat Globe Valve
The welded double-seat globe valve comes with an integrally forged valve body and butt-weld ends, fitted with an internal double balanced sealing plug assembly. This design significantly cuts down the medium pressure thrust imposed on the valve stem, enabling effortless handwheel actuation and dependable sealing. It serves as an ideal shut-off solution for high-temperature and high-pressure steam, petroleum and chemical process pipelines.
Fabricated from integrally forged A105 carbon steel or F304/F316 stainless steel, the valve body features compact metallic microstructure without casting flaws, guaranteeing stable performance under prolonged high-pressure and thermal cycling loads. Butt weld (BW) ends allow seamless jointing with piping, delivering robust monolithic construction and minimising potential leakage risks. Its innovative double balanced seat configuration works by having upper and lower sealing faces counteract medium pressure against each other, offsetting most fluid thrust. Consequently, the torque required for manual operation is substantially lower than that of single-seat globe valves, making handwheel manipulation labour-efficient.
Stellite cobalt-based hardfacing is applied onto sealing surfaces to withstand high-temperature flushing, wear and corrosion, sustaining excellent tight shut-off capability for steam and hot oil services. The valve stem utilises flexible graphite packing alongside an anti-blowout structure to stop pressurised medium escape. Available pressure classes include Class 800, 1500 and 2500, while the operating temperature spans -29℃ to 550℃ subject to selected body material.
This valve finds extensive use in thermal power boilers, petrochemical complexes, natural gas terminals and high-temperature hot oil circulation pipelines. Customisation on bore size, pressure class and alloy material is available to satisfy bespoke working condition requirements.
Parameters
| Valve body material | WCB |
| Applicable media | Oil,Gas,Water |
| Connection | Flange |
| Power | Manual/Electric/Pneumatic |
| Sealing Type | Hard Seal |
| Warranty period | 12 months |
| Certificate | CE ,IS09001 ,IS014001,IS045001 |
Advantages
Final Solution
Integrally Forged Valve Body
The body is integrally forged from A105 carbon steel, F304 or F316 stainless steel. Dense metallic structure eliminates casting defects, ensuring stable performance under long-duration high pressure and thermal load.
Butt Weld (BW) Connection
BW ends achieve seamless connection with process pipelines. The integrated connection construction is sturdy and effectively lowers medium leakage risks.
Double Balanced Seating Design
Upper and lower sealing surfaces bear reverse medium pressure to offset most fluid thrust. The required manual opening/closing torque is much smaller than conventional single seat globe valves for labour-saving operation.
Features
Widely deployed in thermal power boilers, petrochemical plants, natural gas stations and high-pressure hot oil circulation piping systems.
Custom service available: Caliber, pressure rating and alloy materials can be customized to match special working conditions.
Application Scenarios
Safe Valve Stem Assembly
Equipped with flexible graphite packing and anti-blowout structure, which prevents medium leakage under pressurized working conditions and improves operational safety.
Hard-faced Sealing Surfaces
Sealing areas are overlaid with Stellite cobalt-based alloy. Outstanding resistance against high temperature scouring, abrasion and erosion to maintain reliable bubble-tight shut-off for steam and hot oil media.
Double Balanced Seating Design
Upper and lower sealing surfaces bear reverse medium pressure to offset most fluid thrust. The required manual opening/closing torque is much smaller than conventional single seat globe valves for labour-saving operation.
Butt Weld (BW) Connection
BW ends achieve seamless connection with process pipelines. The integrated connection construction is sturdy and effectively lowers medium leakage risks.
Certifications
ISO certification is not just an entry requirement for our company, but a clear reflection of our commitment to product quality, standardized management, and core competitiveness. It also supports our transformation from traditional low-end manufacturing toward high-end, standardized production.
Products Description
SND Tech is a specialized valve manufacturer concentrating on robust hydraulic control valves and high-performance flow control solutions for industrial and municipal engineering sectors. Equipped with solid technical capabilities, proprietary patented technologies and experience from international collaborative projects, we implement rigorous ISO 9001 quality management systems throughout production to guarantee steady quality and consistent product reliability.
We adopt advanced automated production machinery alongside smart manufacturing management modes to steadily elevate production efficiency and quality inspection criteria. Our products enjoy wide industry recognition and have been qualified for numerous construction and infrastructure projects nationwide in China.
Powered by a full-fledged sales and after-sales service network, SND Tech persists in technological innovation and new product R&D. Through ongoing optimization of valve designs and fabrication procedures, we strive to supply global clients with long-lasting, high-efficiency and trustworthy flow control solutions.
FAQ
FAQ
Q: What are the core advantages of a welded double seat globe valve compared with a single seat globe valve?
A: Different from traditional single seat globe valves, this valve adopts an internal double balanced sealing disc structure. The upper and lower sealing surfaces bear opposite medium pressure, which offsets most fluid thrust on the valve stem. It greatly reduces manual operating torque, makes handwheel opening and closing more labor-saving, and avoids the problem of difficult valve operation under high-pressure working conditions. Meanwhile, the integrally forged body ensures higher structural stability and sealing reliability.
Q: What working conditions and media is this valve suitable for?
A: It is specially designed for high-pressure and high-temperature working scenarios. It is widely applicable for cutting off pipelines conveying high-temperature steam, hot oil, petroleum and chemical media. It is commonly used in thermal power boilers, petrochemical plants, natural gas stations and high-pressure hot oil circulation systems.
Q: What are the available pressure grades and temperature ranges?
A: The standard pressure classes cover Class 800, Class 1500 and Class 2500. The operating temperature ranges from -29℃ to 550℃, and the specific applicable temperature depends on the selected valve body material (A105 carbon steel / F304 / F316 stainless steel).
Q: Why choose integrally forged valve body instead of cast body?
A: The valve body is integrally forged with dense and uniform metal texture, completely free of porosity, sand holes and other casting defects. It can withstand long-term high pressure and thermal load cycles, with better mechanical strength, pressure resistance and high-temperature stability than cast valves, effectively avoiding body deformation and medium leakage in extreme working conditions.
Q: What is the feature of the valve sealing surface?
A: The sealing surface is overlaid with Stellite cobalt-based alloy, which has excellent resistance to high-temperature scouring, abrasion and chemical erosion. It can maintain bubble-tight shut-off performance for a long time even under high-temperature steam and hot oil impact, greatly extending the service life of the valve core.
Q: Can I customize the valve specifications and materials?
A: Customization is fully supported. We can adjust the valve caliber, pressure rating and body alloy materials according to your special working conditions, to meet the personalized needs of different industrial and municipal pipeline projects.
Hot Tags: welded double seat globe valve, China welded double seat globe valve manufacturers, suppliers, factory, globe valve pneumatic
