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Valves

Check Valve (Swing / Wafer / Lift)

Non-return valve — swing, wafer, lift, tilting disc, dual-plate types.

Category
Valves
Subcategory
Check Valve
Applicable standards
5
Issuing bodies
3

Description

Non-return valve — swing, wafer, lift, tilting disc, dual-plate types.

Applicable Standards (5)

API — 3 standards

API 594 Check Valves: Flanged, Lug, Wafer and Butt-welding
Edition: 8th Edition (2017) Region: USA, Global
Wafer/lug/flanged/butt-weld check valves Class 125 through 2500.
Key requirements (7)
  • Check valves — wafer, lug, double-flanged.
  • Sizes: NPS 2 to 48; classes 125, 150, 250, 300, 600.
  • Disk types: dual-plate (most common), tilting disc, swing.
  • Hydrotest per API 598 — shell & seat.
  • Disk closure spring: prevents slamming on flow reversal.
  • Wafer style: bolted between flanges, lighter than flanged check.
  • Selection: cracking pressure, allowable backpressure, fluid service.
API 602 Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries
Edition: 11th Edition (2022) Region: USA, Global
Compact (small-bore) carbon steel valves for petroleum, petrochemical and gas service.
Key requirements (5)
  • Gate, globe, check valves NPS ≤ 4 (DN 100), Class 800–4500 (compact body).
  • For instrument tubing, isolation, drains, vents in process plant.
  • Forged body construction.
  • Bolt-bonnet, welded-bonnet or pressure-sealed bonnet.
  • Hydrotest per API 598.
API 6D / ISO 14313 Pipeline and Piping Valves
Edition: 25th Edition (2021) Region: USA, Global
Ball, check, gate, and plug valves for pipeline service.
Key requirements (7)
  • Pipeline valves — ball, gate, check, plug for liquid and gas pipelines.
  • Pressure classes: ASME B16.34 (150–2500) plus API-specific (10000 / 15000 psi).
  • Full-bore (full opening) — passes pipeline pig with min restriction.
  • Fire-safe per API 6FA / ISO 10497.
  • Anti-static device required (ball/stem ground continuity).
  • Double Block & Bleed (DBB) and Double Isolation & Bleed (DIB) configurations.
  • Cavity over-pressure relief required (self-relieving seat or cavity vent).

ASME — 1 standard

ASME B16.34 Valves — Flanged, Threaded, and Welding End
Edition: 2020 Edition Region: USA, Global
Pressure-temperature ratings, dimensions, materials, NDE, marking and testing for valves.
Key requirements (7)
  • Pressure–temperature ratings for valves (steel).
  • Pressure classes: 150, 300, 400, 600, 900, 1500, 2500, 4500.
  • Body wall thickness: t = (P·d)/(2·S·E − 1.2·P) + c, plus tabulated minimums.
  • Hydrotest: shell at 1.5 × Class 100 °F rating; seat at 1.1 × Class 100 °F rating.
  • Special class allows 25% above standard rating with stricter NDE (radiography + hardness).
  • Materials per ASME II Part D allowable stress.
  • End connections: threaded, flanged, butt-weld, socket-weld.

BIS — 1 standard

IS 5312 Swing Check Type Reflux (Non-Return) Valves
Edition: Part 1: 2004 (R2019); Part 2: 1986 Region: India
Indian standard for swing check (non-return) valves.