1/2"-800LB Close Die Forged Lift Check Valve

1/2″-800LB Close Die Forged Lift Check Valve

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Description

API 602 Forged Steel Lift Check Valve Technical Data Sheet

A105N Material 1/2″ 800LB NPT/Welded Ends

1. General Information

Item Specification
Valve Type Lift Check Valve
Design Standard API 602 / ASME B16.34 / BS 5352
Nominal Size 1/2 inch (DN15)
Pressure Class Class 800 LB (PN130)
Structure Type Lift Type, Bolted Bonnet
Connection Type NPT Threaded (ASME B1.20.1) or Socket Weld (ASME B16.11)
Installation Horizontal Piping
Body Material ASTM A105N (Forged Carbon Steel)

2. Applicable Standards

Item Standard Code
Design & Manufacturing API 602, ASME B16.34, BS 5352
Face-to-Face / End-to-End Manufacturer Standard / ASME B16.10
Socket Weld Ends ASME B16.11
Threaded Ends ASME B1.20.1 (NPT)
Test & Inspection API 598
Pressure-Temperature Rating ASME B16.34
Valve Marking MSS SP-25

3. Main Design Features

  • Operating Principle: Automatically opens and closes the disc by medium flow. When medium flows in the specified direction, disc opens under medium pressure. When backflow occurs, disc closes against seat to prevent reverse flow

  • Disc Structure: Disc moves vertically along the body centerline, reliable operation, suitable for small bore applications

  • Body Construction: One-piece die forged body, dense structure, high strength, no casting defects

  • Bonnet Connection: Bolted bonnet design with stainless steel/flexible graphite spiral wound gasket sealing

  • Sealing Surface: Hardfaced with alloy steel or carbide, reasonable material pairing, long service life

  • Installation Requirement: Suitable for horizontal pipelines only, disc closes by gravity

4. Main Component Materials (A105N Material)

Item Part Name Material Standard/Remark
1 Body ASTM A105N Forged Carbon Steel, suitable for NACE MR0175
2 Bonnet ASTM A105N Forged Carbon Steel
3 Disc ASTM A276 410 / A105N+STL 13Cr Stainless Steel or Hardfaced
4 Seat Integral / STL Hardfaced Machined directly on body or hardfaced
5 Gasket 304 + Flexible Graphite Spiral Wound
6 Stud Bolt ASTM A193 Gr.B7 Alloy Steel
7 Hex Nut ASTM A194 Gr.2H Heavy Hex Nut

5. Technical Parameters & Dimensions

5.1 Pressure-Temperature Ratings

Item Parameter
Nominal Pressure Class 800 LB (PN130)
Shell Test Pressure 207 bar (3000 PSI)
Seat Test Pressure 152 bar (2200 PSI)
Low-Pressure Pneumatic Test 5 – 7 bar (Air)
Temperature Range -29°C ~ 425°C
Applicable Media Water, steam, oil, etc.

5.2 Dimensions (1/2″ Class 800)

Dimension Value Remark
End-to-End Length (L) 73 mm Socket Weld/Threaded ends, per Sant Valves data
Height (H) Approx. 53 mm Reference value
Socket Weld Bore (A) 10 mm Min. socket weld depth
Socket Weld Dia (B) 21.8 – 22.2 mm Socket weld bore range
Threaded End 1/2″ NPT Per ASME B1.20.1
Weight Approx. 1.0 kg Reference value, may vary by manufacturer

5.3 End Connection Details

  • NPT Threaded Ends: Per ASME B1.20.1, 1/2 inch American Standard Taper Pipe Thread

  • Socket Weld Ends (SW): Per ASME B16.11, bore diameter and depth conforming to standard

  • Flow Direction: Clear flow direction arrow marking on body

6. Test & Inspection (API 598)

Test Item Test Pressure Medium Acceptance Criteria
Shell Test 207 bar (Hydrostatic) Water No visible leakage
High-Pressure Seat Test 152 bar (Hydrostatic) Water No visible leakage
Low-Pressure Seat Test 5 – 7 bar (Air) Air No bubbles leakage
Test Duration Per API 598 — Hold time conforms to standard

7. Marking & Supply

  • Valve Marking: Per MSS SP-25, nameplate to include nominal size, pressure class, material, heat number, design standard, etc.

  • Flow Direction: Clear flow direction arrow marking on body

  • Cleaning & Protection: Valves internally and externally cleaned, ends covered with protectors, threaded or weld ends coated with rust preventive

  • Documentation: Material certificates, pressure test reports, declaration of conformity provided with shipment

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