B148 C95800 Screwed Bonnet Al-bronze Gate Valve
B148 C95800 Screwed Bonnet Al-bronze Gate Valve - Image 2

B148 C95800 Screwed Bonnet Al-bronze Gate Valve

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Description

TECHNICAL DATA SHEET

PRODUCT: ALUMINUM BRONZE GATE VALVE, THREADED BONNET, FLANGED OR THREADED ENDS

1. VALVE DESCRIPTION & SPECIFICATIONS

  • Type: Gate Valve (Solid Wedge)

  • Operation: Manual (Handwheel)

  • Design Standard:

    • Flanged Ends: API 602 / MSS SP-80

    • Threaded Ends: MSS SP-80 (Threads per ASME B1.20.1 NPT)

  • Pressure Rating: ASME Class 150 (PN 20)

  • Body/Bonnet Connection: Threaded Bonnet (Direct Screwed into Body)

  • Stem Operation: Outside Screw & Yoke (OS&Y)

  • Seat Design: Renewable Seat Rings (RS)

2. SIZE & END CONNECTION OPTIONS

Parameter Flanged Ends Threaded Ends
Nominal Size ½” to 2″ ½” to 2″¹
End Connection ASME B16.5 RF (Raised Face) NPT (ASME B1.20.1)
Pressure Class 150 LB 150 LB
¹ Threaded bonnet limited to NPS ≤ 2″ for pressure integrity.

3. MATERIALS OF CONSTRUCTION

Component Material Specification Alloy / Grade
Body ASTM B148 C95800 (Aluminum Bronze)
Bonnet ASTM B148 C95800
Gate ASTM B148 C95800
Seat Rings ASTM B148 C95800
Stem ASTM B124/B283 C63000 (Al-Ni Bronze)
Stem Nut ASTM B505 C93200 (Bearing Bronze)
Yoke ASTM A536 65-45-12 Ductile Iron
Sealant – PTFE Tape/Thread Sealant
Packing – Flexible Graphite

4. KEY DESIGN FEATURES

  • Bonnet Connection:

    • Sealed by thread interference + PTFE (no gasket)

  • End Connections:

    • Flanged: ASME B16.5 RF (NPS ½”-2″)

    • Threaded: Tapered NPT threads

  • Stem Seal:

    • Adjustable graphite packing

    • No backseat (inherent to threaded bonnet)

  • Maintenance:

    • Bonnet removal requires full unthreading (not field-friendly)

5. TESTING & CERTIFICATION

Test Standard Test Pressure Leakage Class
Shell Test API 598 300 PSI (2x 150#) –
Seat Test API 598 165 PSI (1.1x 150#) Class IV
Backseat – Not Applicable –

6. DIMENSIONS & FINISH

  • Face-to-Face: ASME B16.10 Short Pattern

  • Weight: 20-30% lighter vs. bolted bonnet

  • Surface:

    • Threads: Anti-seize coated

    • External: Primer (RAL 5015)

7. ADVANTAGES & LIMITATIONS

Advantages Limitations
• Lower cost • Max size: NPS 2″
• Lighter weight • Max pressure: 150 LB
• No bolt corrosion • Avoid thermal cycling >120°C (250°F)
• Simplified design • Bonnet removal may damage threads

8. OPTIONS

  • Sealant: PTFE tape (std) / High-temp compound

  • Yoke: 316 SS (corrosive environments)

  • Certs: PED 2014/68/EU Cat. I

CRITICAL NOTES:

  1. Temperature Limit:

    • Do not exceed 120°C (250°F) – thermal cycling causes leakage.

  2. Installation:

    • Never overtighten bonnet – risk of galling/body distortion.

  3. Maintenance:

    • Reapply thread sealant after every disassembly.

  4. Replacement:

    • Damaged threads require full valve replacement.

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