Stainless Steel Flanged Ball Valve

Bolaisi Valve Co., Ltd. is a specialized valve brand with nearly two decades of experience in industrial fluid control. Located in Wenzhou, Zhejiang—known as the "Pump and Valve Capital of China"—the company focuses on manufacturing a wide range of stainless steel valves. Bolaisi Valve pursues a high-end market strategy, eschewing low-quality products. Its stainless steel flanged ball valves are manufactured using the silica sol casting process, with valve bodies undergoing secondary sandblasting. As a reliable supplier for fluid piping systems, the company employs a rigorous quality inspection system; every valve undergoes multiple simulated tests before leaving the factory, covering everything from raw material analysis and machining to seal assembly and dual pressure testing (hydrostatic and pneumatic). With extensive experience in producing stainless steel floating ball flanged valves, the company specializes in valves characterized by low flow resistance, zero leakage, and ease of maintenance. All performance metrics—including pressure, temperature, and sealing capabilities—are derived from actual pipeline operating conditions, ensuring accurate specifications without inflated ratings.

Performance Testing Under Actual Operating Conditions

1. Pipeline Circulation Testing

·Test Duration: Continuous circulation loading tests (water, oil, or steam) lasting several hours.

·Test Scenarios: Chemical transport pipelines, municipal water supply and drainage networks, gas transmission pipelines, power plant water/steam piping, and fluid systems in metallurgy and papermaking.

·Compatible Media: Fresh water, oil products, natural gas, high-temperature steam, and mildly corrosive fluids.

·Key Conclusion: For industrial pipeline shut-off valves, sealing reliability, high flow capacity (large bore), and actuator compatibility are paramount; this flange ball valve is designed specifically to offer low flow resistance and rapid opening/closing capabilities.

2. Comparative Testing of Floating Ball Sealing Structures

A 30-day high/low-temperature cycling pressure test comparing a standard, basic flange ball valve with the Bolaisi GB-compliant stainless steel flanged ball valve:

·Basic Flange Ball Valve: Seat prone to wear and leakage after prolonged exposure to media flow; non-standard flange dimensions incompatible with mainstream industrial piping; supports only manual operation.

·Bolaisi GB-Compliant Flange Ball Valve: Features a floating ball with bi-directional self-tightening sealing; seal integrity remains stable after thermal cycling; standardized GB flange dimensions ensure broad compatibility; valve body allows for direct mounting of worm gear, pneumatic, or electric actuators for automated control.

Key Structural Advantages:

1. Floating Ball Straight-Through Flow Path: Full-bore design minimizes flow resistance, ensuring smooth media flow and preventing clogging from debris accumulation.

2. GB-Compliant Flange Connection: Standardized bolt hole configuration ensures compatibility with mainstream industrial pipelines and facilitates easy installation, removal, and maintenance.

3. Multi-Actuator Compatible Stem Design: Standard extended stem allows for direct attachment of handles, worm gears, or pneumatic/electric actuators.

4. Bi-Directional Pressure Sealing: Ensures a tight seal regardless of flow direction, making it suitable for pipelines with forward or reverse flow.

3. Seal Performance Testing for High and Low-Temperature Media

The valve undergoes simulated sealing tests for two distinct operating conditions: ambient-temperature fluids and high-temperature steam:

·Soft-seal condition test parameters: Media temperature ≤150°C; continuous circulation of water, gas, and oil for 720 hours. Test results: No wear on the PTFE seat; zero internal leakage during gas-tightness pressure testing; suitable for clean water, gas, and ambient-temperature oil (particle-free).

·Reinforced-seal condition test parameters: Media temperature ≤200°C; continuous testing with high-temperature steam and media containing trace impurities. Test results: Reinforced sealing surfaces withstand high-temperature erosion and particle impact; no internal or external leakage under high-temperature conditions.

The dual-compatibility sealing solution covers the vast majority of industrial fluid applications. A single valve body can be fitted with the appropriate seal based on the medium's temperature, allowing one valve to handle multiple operating conditions and reducing procurement and inventory costs for enterprises.

Application Scenarios

Chemical Industry

Transport of acidic/alkaline fluids, chemical raw material pipelines, reactor piping, and water supply/drainage systems in chemical parks; corrosion-resistant stainless steel flange ball valves handle various corrosive media and provide rapid shut-off.

Oil and Gas Industry

Oilfield pipelines, gas transmission networks, oil-gas separation equipment, and refined oil pipelines; features high pressure resistance and sealing integrity, suitable for medium-to-high pressure conditions and safe fluid isolation.

Water Treatment and Environmental Protection

Municipal water mains, sewage treatment plant piping, water purification equipment, reclaimed water systems, and rainwater drainage projects; large-diameter stainless steel flanged ball valves facilitate flow control in extensive pipeline networks.

Pharmaceutical and Food Industries

Pharmaceutical purified water lines, food processing fluid lines, and beverage production/transport systems; sanitary-grade materials ensure cleanliness and purity, meeting clean production standards.

HVAC and Thermal Energy

Central air conditioning mains, residential heating pipelines, thermal energy transmission networks, and boiler room valves; high-temperature resistance makes them suitable for hot water and steam applications.

Power and New Energy

Power plant circulating water systems, fluid lines for new energy equipment, energy storage system piping, and industrial cooling water lines; ensures stable and durable operation. Municipal Construction

Main pipelines for building complexes, municipal network upgrades, industrial piping for factory sites, and large-scale facility water supply and drainage systems; features secure flange connections for easy future maintenance and disassembly.

Marine & Offshore Industry

Shipboard water supply and drainage, hold fluid piping, and offshore platform transfer lines; vibration-resistant and corrosion-resistant, designed for demanding outdoor environments.

Product Specifications

1. Brand/Model: Bolaisi Q41F/W-10P/16P/25P/40P/64P

2. Body Material: Stainless steel; corrosion- and erosion-resistant, suitable for long-term industrial fluid service

3. Nominal Diameter: DN15–DN400 (covers everything from small branch lines to industrial mains; customization available)

4. Sealing Type: PTFE soft seal / Reinforced high-temperature seal

5. Pressure Rating: Multiple options available (PN10/16/25/40/64)

6. Flow Direction: Bi-directional flow; floating ball self-sealing design

7. Connection Type: GB standard flange connection; compliant with universal flange dimension standards

8. Valve Type: Floating ball, straight-through design

9. Applicable Media: Fresh water, oil, natural gas, high-temperature steam, mildly corrosive fluids

10. Operating Temperature: Soft seal ≤150°C; hard seal ≤280°C

11. Actuation: Standard manual operation; compatible with worm gear, pneumatic, electric, or hydraulic actuators

12. Operation: Stem rotates the ball 90° for full open/close; low flow resistance and rapid operation

Key Advantages

1. Verified Performance: Real-world testing confirms specifications; sealing, heat resistance, and pressure-bearing capabilities validated through 720 hours of pipeline cycling tests—no inflated ratings.

2. Comprehensive Range: Full coverage of sizes (DN15–DN400) and pressure ratings (PN10 to PN64). Supports multiple pressure ratings; a single product line fits industrial pipelines of various sizes;

3. Flexible drive options for easy automation upgrades: Features a standard extended stem—eliminating the need for adapter brackets—allowing for the quick installation of various actuators to enable remote control;

4. Floating ball design with bidirectional sealing for leak-proof safety: Ensures a tight seal regardless of flow direction, offering high safety for hazardous media such as oil, gas, and fuel gas;

5. Standardized GB flanges for high versatility: Uniform flange bolt hole dimensions allow for direct connection during pipeline retrofits without the need for additional machining;

6. Rigorous factory quality inspections ensure consistent quality: Includes flaw detection for the stainless steel body and dual hydrostatic/pneumatic pressure testing; eliminates defects like sand holes or leaks before shipment, ensuring a longer service life.

Why choose Bolaisi stainless steel Flanged Ball Valves?

Are you looking for a stainless steel shut-off ball valve that handles various media and pressure ratings while supporting automation upgrades? Choose the Bolaisi Q41F/W series stainless steel flanged ball valve—backed by mature stainless steel casting and machining processes, validated through hours of real-world pipeline testing under diverse conditions, and guaranteed by comprehensive quality control.And why choose Bolaisi:

Over 20 Years of Valve Manufacturing Experience

With more than two decades of deep involvement in the valve industry, we possess the expertise and manufacturing capabilities to deliver high-quality valve solutions.

Strict Quality Control

From raw material procurement to final delivery, we implement rigorous quality inspections throughout the production process to ensure stable performance and a long service life.

Professional Customization Services

We offer custom valve manufacturing based on customer drawings, samples, and specific application requirements to meet the diverse needs of various projects.

Advanced Production Capabilities

Supported by professional manufacturing facilities and an experienced technical team, we ensure high production efficiency and a stable supply capacity.

A Trusted Global Supplier

Our valves are trusted by customers worldwide, exported to numerous countries and regions, and backed by long-term, stable partnerships with clients across the globe.

Comprehensive Customer Support

We provide professional support and service throughout the entire partnership, covering everything from product inquiries and sample approval to production progress tracking and after-sales service.

FAQ

Q1: Can this stainless steel flanged ball valve regulate flow? Can it be used in a semi-open position for extended periods?

A: This product is primarily designed for on/off service and can handle short-term flow regulation; however, long-term operation in a partially open state is not recommended, as sustained throttling accelerates erosion and wear on the sealing surfaces, thereby shortening the valve's service life. For precise flow control, a V-port regulating ball valve is recommended.

Q2: Which seal type should be selected for high-temperature steam applications (150°C/200°C)?

A: For clean water, oil, or standard steam at temperatures ≤150°C, a standard PTFE (Teflon) soft seal is suitable. For high-temperature steam approaching 200°C, a high-temperature-resistant hard seal is recommended to prevent the failure or leakage caused by the softening of standard PTFE seals at high temperatures.

Q3: Can a 304 stainless steel valve body be used with media containing chloride ions or seawater?

A: A standard 304 valve body is suitable only for clean water or oil with low chloride ion content. For corrosive environments with high chloride ion levels—such as seawater or pickling processes—a 316 or 316L stainless steel valve body is required to effectively resist chloride-induced pitting corrosion.

Q4: How should slight stem leakage be handled? Is it necessary to remove the entire valve?

A: There is no need to remove the valve from the pipeline; the issue can be quickly resolved by simply removing the upper gland and replacing the internal packing seal. This process is simple and minimizes downtime for maintenance.

Q5: Can pneumatic or electric actuators be retrofitted onto manual valves?

A: Yes. The valve body features a universal extended stem design, allowing for automation upgrades by simply attaching an actuator with the appropriate torque—no valve body replacement or pipeline modification is required.

Q6: Can flanges with different pressure ratings (PN16, PN25, PN40) be used interchangeably?

A: Mixing them is not recommended. Flanges of different pressure ratings vary in thickness, bolt hole diameters, and pressure-bearing standards; mixing them poses safety risks such as high-pressure leakage or flange deformation. Selection must match the pipeline's design pressure rating.

Q7: How often should the valve be maintained? Do wear parts need periodic replacement?

A: For standard operating conditions involving clean water or oil at ambient temperatures, an inspection once a year is sufficient. For high-temperature, gas, or corrosive media applications, inspections should be conducted every six months. If the sealing packing and valve seat show no signs of wear or leakage, they can continue to be used; replacement of wear parts is only necessary if leakage occurs, eliminating the need for mandatory periodic replacement.

Q8: What should be done if large-bore valves (DN300, DN350) are difficult to operate?

A: For large-bore pipelines, it is recommended to equip the valves with a worm gear mechanism to significantly reduce operating torque; for automated applications, pneumatic or electric actuators can be installed to enable remote, one-touch operation, eliminating the need for manual handling.