Double Flange Triple offset Butterfly Valve is metal-to-metal seated, offering zero leakage, bi-directional flow control, and low emissions. They are suitable for extreme temperatures from -10°C to 400°C, with a triple offset sealing system that ensures friction-free operation and adaptability to temperature fluctuations.
For the structure of the Double Flange Triple offset Butterfly Valve, when the valve is under the complete open state, its butterfly plate sealing face will break away from the valve seat sealing face completely; when it is opened from 0 to 90°, the butterfly plate sealing face will break away from the valve seat sealing face upon opening; when it is closed from 90° to 0°, and only upon closing, the butterfly plate sealing face can contact and press onto the valve seat sealing face tightly.
Product Range：
Body material: carbon steel, stainless steel, alloy steel
Nominal diameter: 2"～180"(DN50~DN4500)
Pressure range:Class150～600(PN10~PN100)
End connection: RF, RTJ
Working temperature:-46℃～+200℃
Operator: Lever, Gear, Pneumatic, HYD Actuator, Electric Motor ect.
Design standard as per: API 609, ASME B16.34, GB/T12238, JB/T 8527.
Small installation space, light weight, and maintenance friendly;
Good sealing effect and long service life;
Simple structure and small opening/closing torque;
Good flow adjusting ability, high precision of flow characteristic curve and good dynamic adjustment stability;
For soft seat the leakage rate: ANSI B 16.104 Ⅵ.
|
Feature |
Single Offset/Concentric Valve |
Triple Offset Valve |
|
Seal type |
The valve seat is usually made from polymers or other soft materials to enable a friction seal with the metal disc. |
The three offsets allow for metal-to-metal seals using alloys for both the seat and disc. |
|
Seat friction |
High, because friction is the basic sealing mechanism. Thus, it is susceptible to wear and results in a shorter seat lifespan. |
Seat friction is insignificant because sealing is by contact pressure. As a result, the valve seat enjoys much longer operational life. |
|
ANSI pressure class rating |
Although this valve can deliver bubble-tight shut-off, its inferior sealing mechanism, and susceptibility to wear limit this to class 150. |
Delivers dependable sealing which does not wear easily. Models such as the triple offset can achieve a 1500-pound rating. |
|
Fluid services |
Because of its friction sealing mechanism, it is only effective with clean fluid. |
The triple offset sealing mechanism is more tolerable to dirt, so works with clean or dirty fluids. |
|
Applications |
Common in utilities and domestic applications. |
Can function effectively in severe service and high cyclic operations. |
Products Benefits
The Double Flanged Triple Offset Butterfly Valve is engineered for precision and durability in high-pressure and high-demand environments.
1 – Triple Offset Design: Delivers superior sealing performance and reduces torque, providing a tight shut-off and enhancing valve longevity.
2 – Double Flanged Configuration: Designed for robust installation with flanges on both sides, ensuring stability and easy integration into piping systems.
3 – High-Quality Materials: Constructed from durable materials to withstand extreme conditions and high pressures.
4 – Leak-proof Sealing: Advanced sealing mechanism minimizes leakage and ensures reliable operation.
5 – Versatile Applications: Ideal for demanding industrial applications such as water treatment, chemical processing, and power generation.
Installation and Maintenance
Installation and Maintenance Guidelines for Double Flange Triple Offset Butterfly Valve
1. Installation Considerations
Directional Alignment: Ensure the valve is installed in the correct flow direction (indicated by the arrow on the valve body) to avoid reverse pressure damage.
Flange Compatibility: Verify that the double flange connections match the pipeline specifications (e.g., pressure class, material). Use appropriate gaskets (e.g., PTFE or graphite) to prevent leaks.
Avoid Stress: Do not force the valve into position. Align flanges precisely to prevent distortion of the valve body or disc.
Support Structure: Install supports or brackets to minimize external stress on the valve, especially in high-pressure or vibration-prone environments.
Seal Testing: After installation, perform a pressure test to confirm zero leakage. Use clean water or air at 1.5× the working pressure for testing.
2. Maintenance Best Practices
Regular Inspections:
Check for corrosion, wear, or deformation in the disc, seat, and stem.
Inspect flange connections for looseness or gasket degradation.
Lubrication: Apply high-temperature grease to the stem and bearing areas (refer to manufacturer guidelines for compatible lubricants).
Cleaning: Remove debris from the valve seat and disc using soft brushes or compressed air. Avoid abrasive tools to prevent surface damage.
Seal Replacement: Replace EPDM/NBR seals every 2–3 years or if cracks/leaks occur. For metal-seated valves, inspect for pitting or scoring.
Actuator Care: For pneumatic/hydraulic actuators, drain accumulated moisture from air filters and check control circuits for malfunctions.
3. Operational Tips
Avoid Slight Openings: Frequent partial openings can accelerate seat/disc wear. Use the valve for on/off purposes unless designed for throttling.
Temperature Limits: Operate within the rated temperature range (typically -40°C to 150°C) to prevent material fatigue.
Documentation: Maintain a maintenance log to track inspections, repairs, and replacement schedules.
Note: Always refer to the manufacturer's manual for model-specific instructions. For critical applications (e.g., high-pressure or corrosive media), consult a professional technician for periodic audits.
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