B148 C95800 SDNR Straight Pattern Globe Valve

Description

Technical Data Sheet

Straight Pattern SDNR (Screw-Down Non-Return) Globe Valve
Body Material: ASTM B148 C95800 (Nickel Aluminium Bronze)

Product: Straight Pattern Screw-Down Non-Return Globe Valve
Valve Type: Straight Pattern Globe Valve with SDNR Function
Model: H41 Series (Straight Pattern, Flanged Ends)
Body Material: ASTM B148 C95800 / UNS C95800 (Nickel Aluminium Bronze)
Design Features: OS&Y (Outside Screw & Yoke) , BB (Bolted Bonnet) , RS (Rising Stem)
Standard: BS 1873 / ASME B16.34 / API 602 (as applicable)

1. Product Description

A Straight Pattern Screw-Down Non-Return (SDNR) Globe Valve combines the functions of an isolation valve and a check valve in a single, straight-through body configuration . The “Screw-Down” feature allows manual closure by screwing the stem down to force the disc onto the seat, providing positive shut-off independent of line pressure. The “Non-Return” function enables the disc to act as a check valve when the stem is fully raised, automatically preventing backflow .

The ASTM B148 C95800 Nickel Aluminium Bronze body offers exceptional corrosion resistance, particularly in seawater, marine environments, and chemical applications, with excellent resistance to cavitation, erosion, and biofouling .

2. Design & Inspection Standards

3. ASTM B148 C95800 Material Properties

C95800 (Nickel Aluminium Bronze) is a copper-aluminum-iron-nickel alloy with exceptional mechanical and corrosion-resistant properties .

4. Technical Parameters

5. Material Specifications

6. Key Design Features

SDNR (Screw-Down Non-Return) Functionality:

• Combines isolation valve and check valve functions in a single unit

• Manual screw-down stem provides positive shut-off independent of line pressure

• When stem is fully raised, disc acts as automatic non-return check valve

• Prevents backflow and protects pumps and equipment from reverse flow damage

OS&Y (Outside Screw & Yoke) Design:

• Stem threads are positioned outside the valve body and bonnet

• Threads are not exposed to process media, preventing corrosion and wear

• Provides clear visual indication of valve position (open/closed) based on stem rise

• Allows for easy lubrication and maintenance of stem threads

BB (Bolted Bonnet) Construction:

• Bonnet is secured to body with heavy-duty studs and nuts

• Provides robust, pressure-tight sealing for high-pressure applications

• Allows for easy disassembly for maintenance, inspection, and seat replacement

RS (Rising Stem) Operation:

• Stem rises when valve opens, lowers when valve closes

• Immediate visual confirmation of valve status

• Position indicators not required (stem itself shows position)

Straight Pattern Body Design:

• Straight-through flow path with internal baffle

• Disc moves perpendicular to flow direction for precise regulation

• Streamlined flow path with optimized Cv value

C95800 Nickel Aluminium Bronze Construction:

• Superior salt water corrosion resistance

• Resistant to cavitation and erosion

• High strength and toughness

• Good casting qualities and machinability

• Suitable for welding

• Non-sparking for hazardous environments

Loose Disc with Renewable Seat Ring:

• Loose disc design allows for easy replacement

• Choice of plug or ball disc options

• Renewable seat ring extends valve service life

Impact Handwheel (10″ and above):

• Facilitates easier operation for larger valve sizes

Backseat Design:

• Allows for packing replacement under pressure (when valve fully open)

Low Emission Design (Optional):

• Available with live-loaded packing for fugitive emission control per ISO 15848

7. Dimensional Data (Class 150 / Class 300)

Reference dimensions based on ASME B16.10 and manufacturer data . Dimensions may vary by manufacturer.

Class 150 Dimensions (ASME B16.5 RF Flanges)

Class 300 Dimensions (ASME B16.5 RF Flanges)

Note: Dimensions are typical and may vary by manufacturer. Certified drawings should be requested for final installation planning .

8. Applications

• Marine & Shipbuilding: Seawater cooling systems, ballast systems, fire protection systems, bilge systems. C95800 is the industry standard for seawater service, approved by classification societies (BV, DNV, Lloyd’s, CCS, ABS, RINA, NK) .

• 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 and aggressive fluids where C95800 provides superior corrosion resistance .

• Petrochemical Refineries: Suitable for applications requiring resistance to sour service (with NACE compliance) .

• Oil & Gas Industry: Produced water systems, pipelines, and processing facilities .

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

9. Industry Terminology (FAQ)

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Important Notes:

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

• Temperature Range: The valve is rated for -29°C to +300°C based on C95800 material properties . For applications above 200°C, consult manufacturer for seat and gasket material compatibility.

• Stem Material Options:

  • C63000 (Ni-Al Bronze) : Standard option, compatible with C95800 body

  • Monel K500: Enhanced corrosion resistance for severe marine and sour service

• Seat Options:

  • Integral Metal Seat: Standard for full C95800 construction

  • Stellite Hardfacing: Optional for extended wear life in demanding applications

• Optional Features available:

  • Gear operator for sizes above DN200 (8″) and high-pressure classes

  • Motor/electric actuator for automation

  • Position indicators and limit switches

  • Low-emission packing (ISO 15848)

  • NACE MR0175 compliance for sour service

  • Third-party inspection and certification (TÜV, DNV, Lloyd’s, BV, CCS, ABS)

• Service Life: With C95800 material and API/ISO testing, typical service life exceeds 25 years in marine and desalination applications.

• Certified dimensional drawings should be requested for final installation planning