Type R Wafer Check Valve, 3-1/8 in × 5M Flanged, 5,000 psi, API 6A PSL 1 PR1, EE-P+U Sour

The Type R Wafer Check Valve, 3-1/8 in × 5M Flanged, 5,000 psi, API 6A PSL 1 PR1, EE-P+U Sour is a type r check valve rated for 5,000 psi working pressure (5K class) with 3-1/8 in API 6A 5M Flanged (RTJ) inlet and 3-1/8 in API 6A 5M Flanged (RTJ) outlet. NACE MR0175 / ISO 15156 sour-service compliant.

Wafer-style swing check, wafer body fits between matching API 6A 6BX flanges. The disc pivots on a top-mounted hinge and seats by gravity / line pressure. Distinguished by the very short face-to-face dimension and the ring-joint (RTJ) flange interface — common at the inlet of choke manifolds and Christmas tree side-outlets.

Construction

• Type: Check — Type R (Wafer) — Type R
• Nominal size: 3-1/8 in
• Bore: Standard
• Body material: Forged AISI 4130 — NACE MR0175 compliant
• Trim (disc/dart + seat): F6NM disc + Inconel 625 overlay seats
• Seal / elastomer: PEEK back-up + HNBR primary seals
• Inlet: 3-1/8 in API 6A 5M Flanged (RTJ)
• Outlet: 3-1/8 in API 6A 5M Flanged (RTJ)

Performance

Working pressure 5,000 psi. Hydrotested at 1.5× working pressure (shell test); seat-tested per API 6A acceptance criteria. NACE MR0175 / ISO 15156 sour-service compliant — H₂S-rated trim and elastomers, material class EE.

Installation

Install between matching API 6A 6BX ring-joint flanges, with the flow arrow on the body matching line direction. Studs and ring gasket per API 6A 6BX bolting; ensure the wafer is centered in the bore (use centering lugs if the studs allow).

Applications

• 5K wellhead production trees
• Sour-gas surface trees
• 5M Christmas tree side outlets
• Production manifold inlets

Compliance

• API 6A PSL 1 PR1
• 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.