2. BQ41H BQ41Y Jacketed Ball Valve Model Code Definition
The BQ41H BQ41Y model follows standard Chinese valve coding rules, clearly defining its structure and performance characteristics:
B: Heat-insulated / Jacketed type
Q: Ball Valve
4: Flange connection
1: Floating ball, straight-way flow
H/Y: Metal Hard Seal (Stellite / Stainless Steel alloy seal)
Common complete model specifications: BQ41H-16C, BQ41H-25C, BQ41H-40P, representing PN16/25/40 pressure grades with carbon steel or stainless steel body.
3. BQ41H BQ41Y Jacketed Ball Valve Core Structural Features
3.1 Metal Hard Seal System (Key Advantage)
BQ41H BQ41Y Jacketed Ball Valve adopts precision-machined metal hard seal pairs, with the valve seat and ball core overlaid with Stellite alloy or high-strength stainless steel. Compared with PTFE soft seal, the hard seal structure is completely resistant to high temperature deformation, aging and creep. BQ41H BQ41Y Jacketed Ball Valve can stably withstand long-term high-temperature medium impact and tiny particle erosion, solving the failure problem of soft-seal valves under high-temperature and impurity-containing working conditions. It achieves reliable shut-off performance under extreme temperature changes.
3.2 Full Integral Welded Jacket
The valve body is fully wrapped with an integrated pressure-bearing jacket, covering the entire flow channel and flange end without dead cold zones. All jacket welds are precision welded and pass strict air tightness and pressure tests, ensuring no leakage of heating medium (steam, hot water, thermal oil). The jacket circulation channel is optimized for uniform heat transfer, keeping the valve cavity and internal medium at a constant temperature to avoid medium solidification and scaling.
3.3 Floating Ball Straight-through Structure
Adopting floating ball design, the ball core can automatically compensate sealing pre-tightening force according to medium pressure, ensuring tighter sealing under high pressure. The straight-through flow channel features low flow resistance, fast switching speed and no medium retention, which is conducive to self-cleaning and reduces residue accumulation. Full bore and reduced bore options are available to meet pipeline flow and pigging requirements.
3.4 High-strength Pressure-bearing Body
The valve body is made of high-quality cast carbon steel (WCB) or stainless steel (304/316L), with high structural rigidity and pressure resistance. It will not deform under long-term high temperature and pressure, ensuring structural stability and sealing consistency throughout the service life.
4. BQ41H BQ41Y Jacketed Ball Valve Working Principle
The BQ41H jacketed hard seal ball valve integrates temperature preservation and high-pressure shut-off functions. During operation, heating medium such as saturated steam or thermal oil circulates continuously inside the outer jacket, conducting uniform heat to the valve body and internal process medium. This active constant temperature control keeps high-viscosity media fluid and prevents crystallization and solidification.
Benefiting from the metal hard seal design, the valve maintains stable sealing performance even when the medium contains tiny solid particles or operates under ultra-high temperature. The floating ball structure automatically adjusts the sealing gap to offset thermal expansion and mechanical wear, realizing long-term zero-leakage shut-off.
5. BQ41H BQ41Y Jacketed Ball Valve Key Advantages (vs BQ41F Soft Seal Type)
1.Higher Temperature Resistance: Hard seal supports working temperature up to 350℃, far exceeding the temperature limit of soft-seal materials, suitable for high-temperature thermal insulation working conditions.
2.Wear & Erosion Resistant: Metal alloy seal resists particle scouring, no seal damage caused by impurity media, greatly extending service life.
Long-term Stable Sealing: No aging, deformation or failure under continuous high-temperature operation, solving the common defect of soft seal aging and leakage.
3.Strong Working Condition Adaptability: Suitable for high temperature, high pressure, viscous, easy-crystallizing and particle-containing complex media.
4.Low Maintenance Rate: Hard seal structure is durable with fewer vulnerable parts, reducing frequent replacement and maintenance costs.
6. BQ41H BQ41Y Jacketed Ball Valve Standard Technical Specifications
Model: BQ41H BQ41Y
Nominal Diameter: DN15 ~ DN200 (1/2” ~ 8”)
Pressure Rating: PN16, PN25, PN40; ANSI Class150/300
Body Material: WCB Carbon Steel, 304, 316L Stainless Steel
Sealing Material: Stainless Steel Hard Seal, Stellite Alloy Overlay
Applicable Temperature: -20℃ ~ 350℃
Jacket Medium: Saturated steam, hot water, thermal oil
Operation Mode: Manual lever, worm gear, pneumatic, electric actuator
Connection Type: Flange connection (standard)
Structure Type: Floating ball, two-way straight-through, full/reduced bore
7. BQ41H BQ41Y Jacketed Ball Valve Application Scope
BQ41H BQ41Y Jacketed Ball Valve is widely used for high-temperature and easily solidified medium pipelines that cannot be served by soft-seal jacketed valves:
Petroleum & Asphalt Industry: Asphalt, heavy crude oil, residual oil delivery pipelines
Chemical Industry: High-temperature resin, tar, polyurethane, viscous chemical solvent
Fine Chemical & New Energy: High-temperature slurry, adhesive, polymer melt medium
Heating & Thermal Engineering: Steam heat-preservation circulating pipeline system
Metallurgy & Building Materials: High-temperature viscous fluid conveying system
8. BQ41H BQ41Y Jacketed Ball Valve Manufacturing & Testing Standards
BQ41H BQ41Y Jacketed Ball Valve is manufactured and tested in accordance with GB/T, ISO, API 6D and ASME B16.34 standards. Each valve undergoes strict shell pressure test, seat sealing test and jacket tightness test before delivery. The metal hard seal pairs are precisely ground to ensure low torque operation and reliable bubble-tight shut-off performance, meeting long-term continuous industrial operation requirements.
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