Stainless Steel Butterfly Valve Disc (Valve Plate)
Key Features & Functions
Material & Corrosion Resistance
Typically forged from 304/316L stainless steel, offering excellent resistance to rust, scaling, and chemical corrosion (e.g., chlorinated water, mild acids).
Suitable for aggressive media in food processing, chemical plants, and marine applications.
Sealing Mechanism
Soft Sealing: Embedded with EPDM, NBR, or PTFE rubber rings for zero leakage in low-pressure applications (e.g., water supply).
Metal Hard Sealing: Stacked stainless steel layers or hard-faced alloys (e.g., Stellite) for high-temperature/high-pressure environments (e.g., steam, oil).
Triple-Offset Design: Advanced valves use a conical disc profile to eliminate friction during closure, extending lifespan.
Flow Control
When fully open, the disc’s thickness is the sole resistance to fluid flow, minimizing pressure drop (ideal for large-diameter pipelines).
Partial rotation enables precise throttling for applications like HVAC systems or water treatment.
Structural Integrity
Reinforced with ribs or frames for large discs (DN800+) to prevent deformation under high flow velocities.
Lightweight compared to gate/globe valves, reducing actuator torque requirements.
Design Variations
Type Description Applications
Concentric Disc Centered in the valve body; simple but less durable. Low-pressure water systems.
Double-Offset Disc Eccentric design reduces seal wear; balances pressure and torque. HVAC, municipal water, food/beverage.
Triple-Offset Disc Conical sealing surface for metal-to-metal contact; zero leakage at high temps. Oil/gas, power generation, chemical plants.
Technical Specifications
Size Range: DN40–DN4000 (1.5"–160")
Pressure Rating: PN6–PN40 (up to 600 PSI)
Temperature Range: -40°C to 600°C (-40°F–1112°F)
Actuation Compatibility: Manual lever, worm gear, pneumatic, electric, or hydraulic actuators.
Advantages Over Alternative Valves
✅ Compact & Lightweight: 50% smaller than gate valves of the same size.
✅ Quick Operation: 90° rotation for rapid open/close.
✅ Low Maintenance: Fewer parts and corrosion-resistant materials reduce downtime.
✅ Cost-Effective: Lower initial cost and energy consumption vs. ball valves.
Common Issues & Solutions
Leakage: Replace worn seals or upgrade to a triple-offset design.
Sticking Disc: Lubricate stems or check for debris in the valve body.
Corrosion: Select 316L stainless steel or apply fluoropolymer coatings for harsh media.
Applications
Industrial: Chemical processing, power generation, pulp/paper.
Commercial: Fire protection, district cooling, water parks.
Residential: Potable water systems, swimming pool circulation.
Quality Standards
Certifications: ISO 9001, CE, API 609, EN 593, UL/FM (for fire safety).
Testing: Pressure tests per API 598, fire safety tests per API 607.
Example Product:
A triple-offset stainless steel butterfly valve with a 316L disc and PTFE seat, rated for PN25 and 300°C, is ideal for steam pipelines in power plants.
This introduction balances technical detail with marketing appeal, suitable for engineers, contractors, or procurement teams evaluating valve options. Let me know if you need adjustments for specific industries!
Silica Sol Precision Casting Process
STEP 01
Wax Pattern Creation
Wax patterns are produced according to the customer’s CAD drawings or samples. This step determines the final dimensions, shape, and surface quality.
STEP 02
Shell Building with Silica Sol Slurry
The wax pattern is repeatedly dipped in a high-purity silica sol slurry and coated with refractory zircon sand, forming a strong ceramic shell.
STEP 03
Drying
Each layer is dried in a constant temperature and humidity environment to avoid cracks and ensure shell integrity.
STEP 04
Dewaxing & Shell Sintering
Wax is removed, and the ceramic shell is sintered at high temperature to achieve strength and dimensional stability.
STEP 05
Metal Pouring
Molten stainless steel 304, 316, carbon steel, alloy steel, or non-ferrous alloys are poured into the shell.
STEP 06
Shell Removal & Cleaning
The shell is broken away, and the raw casting is cleaned of any residual material.
STEP 07
Heat Treatment & Finishing
Heat treatments such as annealing, hardening, tempering, or surface hardening are applied to improve mechanical properties. Surface treatments like electropolishing or mirror polishing are available upon request.
