B148 C95800 Aluminum Bronze Marine Grade Lugged Butterfly Valve

Description

Technical Data Sheet

Wafer Type Concentric Butterfly Valve
Body Material: C95800 (Nickel Aluminium Bronze)
Stem Material: Monel K500
Seat Material: Viton (FKM)

Product: Wafer Type Concentric (Centric) Butterfly Valve
Model: D371X Series (Lever Operated) / D341X Series (Worm Gear Operated)
Design: Concentric / Centric Design (Rubber Lined)
Body Material: C95800 / BS EN 1982 CC333G / ASTM B148 C95800 (Nickel Aluminium Bronze)
Stem Material: Monel K500 (UNS N05500)
Seat Material: Viton (FKM) – Fluoroelastomer
Standard: API 609 / MSS SP-67 / BS EN 593

1. Product Description

A concentric (centric) butterfly valve features a design where the stem passes through the centerline of the disc, and the disc rotates concentrically within the resilient seat. This simple, proven design provides bubble-tight shut-off with low operating torque. The wafer type body fits compactly between pipeline flanges.

The combination of C95800 Nickel Aluminium Bronze body and disc with a Monel K500 stem and Viton (FKM) seat provides exceptional corrosion resistance, particularly in seawater, brine, and aggressive marine environments. This valve is ideal for offshore, shipbuilding, desalination, and chemical applications requiring reliable isolation and long service life .

2. Design & Inspection Standards

3. Material Properties

C95800 (Nickel Aluminium Bronze) Properties

Monel K500 (UNS N05500) Properties

Viton (FKM) Seat Properties

4. Technical Parameters

5. Material Specifications

6. Concentric Butterfly Valve Design Features

1. Concentric (Centric) Design: The stem passes through the centerline of the disc, and the disc rotates concentrically within the resilient seat. This design offers:

   • Simple, proven technology

   • Low operating torque

   • Bubble-tight shut-off with resilient seat

   • Linear flow characteristics

   • Self-cleaning wiping action as disc enters seat

2. Wafer Type Body: Compact design clamps between pipeline flanges, reducing weight and cost compared to lug or flanged designs.

3. C95800 Nickel Aluminium Bronze Construction: Body and disc manufactured from high-strength aluminum bronze with excellent seawater corrosion resistance, cavitation resistance, and biofouling resistance .

4. Monel K500 Stem: Age-hardenable nickel-copper alloy with exceptional strength and resistance to chloride stress corrosion cracking. Two-piece stem design reduces operating torque. Blow-out proof feature ensures safety .

5. Viton (FKM) Seat Liner:

   • Outstanding chemical resistance to oils, fuels, lubricants, and mineral acids

   • Excellent weather, ozone, and UV resistance

   • Provides bubble-tight shut-off per API 598 Rate A

   • Available as bonded liner (for higher pressure) or replaceable cartridge (for ease of maintenance)

6. Bidirectional Sealing: Design provides tight shut-off in both flow directions.

7. ISO 5211 Mounting Pad: Top flange designed to ISO 5211 standard for easy mounting of actuators (lever, gear, pneumatic, electric) without special brackets.

8. Disc Interference Fit: Precision-engineered interference between disc and seat ensures bubble-tight sealing across the full pressure range.

7. Dimensional Data (Wafer Type – Class 150 / PN16)

Reference dimensions based on API 609 Category A (Concentric Resilient Seated) and ISO 5752 Series 13.

Class 150 Dimensions (ASME B16.5 Flange Compatibility)

PN16 Dimensions (BS EN 1092-2 Flange Compatibility)

Note: Dimensions are typical for concentric resilient seated butterfly valves. Certified drawings should be requested for final installation planning.

8. Model Number Explanation

Note: In Chinese valve model nomenclature:

• D = Butterfly Valve

• *3 = Worm Gear (D3) / 7 = Lever (D7)*

• *1 = Concentric Design*

• X = Rubber Lined / Resilient Seated

9. Applications

• Marine & Shipbuilding: Seawater cooling systems, ballast systems, fire protection systems, bilge systems. C95800 + Monel K500 combination is the industry standard for seawater service .

• Offshore Platforms: Seawater injection systems, firewater systems, utilities on offshore installations .

• Desalination Plants: High-salt brine and seawater handling in reverse osmosis and multi-stage flash desalination .

• Coastal Power Plants: Seawater cooling circuits and pump discharge lines.

• Chemical Processing: Handling corrosive chemicals, acids, and aggressive fluids where Viton provides chemical resistance .

• Oil & Gas: Produced water systems, sour service applications where Monel K500’s chloride stress corrosion cracking resistance is essential .

• Shipbuilding: Ballast systems, cooling water, fire mains .

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Important Notes:

• Concentric vs. Eccentric Design: This valve features concentric (centric) design, where the stem passes through the disc centerline. This is the standard design for resilient seated butterfly valves with bubble-tight shut-off at lower pressures .

• Model Correction: D371X (Lever) and D341X (Worm Gear) are the correct models for concentric resilient seated butterfly valves. D373H is for eccentric metal-seated valves .

• C95800 is equivalent to BS EN 1982 CC333G, ASTM B148 C95800, and ISO CuAl10Fe5Ni5 .

• Temperature Rating: The maximum temperature is limited by the Viton seat to 120°C. For higher temperatures, consider EPDM (water up to 130°C) or PTFE (chemical service up to 200°C) seats.

• Optional Features available:

  • Locking device for lever handle

  • Position indicator

  • Stainless steel handle and hardware for full corrosion resistance

  • Gear operator for sizes above DN200 (standard on D341X)

  • Pneumatic or electric actuator for automation

• For higher pressure classes (Class 300 / PN40) or larger sizes (above 600mm/24″), consult the manufacturer.

• Certified dimensional drawings should be requested for final installation planning.