Dart Check Valve, 3 in × 1502 F×M, 10,000 psi, Sour Service

The Dart Check Valve, 3 in × 1502 F×M, 10,000 psi, Sour Service is a dart check valve rated for 10,000 psi working pressure (10K class) with 3 in 1502 Female Weco Union inlet and 3 in 1502 Male Weco Union outlet. NACE MR0175 / ISO 15156 sour-service compliant.

Vertical-flow dart-style design — a spring-loaded poppet (dart) seats against forward-flow stop on no-flow or reverse-flow conditions. Must be installed vertical-flow-up: gravity assists the dart returning to seat. Tighter shut-off than swing checks at low pressures (helpful in cement-pumping iron where slight back-flow during hold can contaminate the trunk).

Construction

• Type: Check — Dart — Dart
• Nominal size: 3 in
• Bore: Full Port
• Body material: Forged AISI 4130 — NACE MR0175 compliant
• Trim (disc/dart + seat): F6NM dart + Inconel 625 body insert
• Seal / elastomer: PEEK back-up + HNBR primary seals
• Inlet: 3 in 1502 Female Weco Union
• Outlet: 3 in 1502 Male Weco Union

Performance

Working pressure 10,000 psi. Hydrotested at 1.5× working pressure (shell test); seat-tested per frac-iron flow-control acceptance criteria. NACE MR0175 / ISO 15156 sour-service compliant — H₂S-rated trim and elastomers, material class EE.

Installation

Install vertical-flow-up only — the dart relies on gravity returning to seat. The body must be plumbed so the dart axis is vertical and the inlet is below the outlet.

Applications

• High-rate sour-well frac iron
• Cement pump-out (sour)
• 3-inch vertical service iron
• Sand / fluid blender protection (sour)

Compliance

• Manufactured to recognised oilfield flow-iron design standards
• Material class EE (API 6A chemistry / sour-service grading)
• NACE MR0175 / ISO 15156 (sour-service)
• Mill test reports per EN 10204 3.1 / 3.2

How to order

Confirm (a) line working pressure and pressure class, (b) inlet and outlet end-connection sizes / styles, (c) service class (standard vs sour), (d) installation orientation (especially for dart-type — vertical-flow-up only), and (e) any flow-velocity or noise constraints (over-spec'd swing checks can chatter at low flow). Indus quotes ex-Dubai for stock items and ex-works OEM for build-to-order items, with full mill test reports and pre-shipment hydrotest certificates.

Companion products

Pair with matched-pressure ball valves, plug valves, gate valves, and SSV/ESDs of the same end-connection family. For frac iron service trees, the 1502/602/206 Weco unions are the matched standard. For wellhead and Christmas tree service, the API 6A 5M/10M/15M flanged geometries pair check valves with master and wing gate valves.