Question 1

What is the working pressure rating?

Accepted Answer

15,000 psi working pressure, 15K class. Hydrotested at 1.5× working pressure (shell test) and seat-tested per API 6A acceptance criteria. The flange and body design rating is 15K per API 6A.

Question 2

What end connections does this valve use?

Accepted Answer

Inlet: 3-1/16 in API 6A 15M Flanged (RTJ). Outlet: 3-1/16 in API 6A 15M Flanged (RTJ). These are API 6A flanged ends with ring-joint (RTJ) gasket sealing per API 6A 6BX hub geometry. Studs and nuts to match the API 6A 6BX bolting pattern.

Question 3

Is this valve suitable for sour-service (H₂S) wells?

Accepted Answer

Yes — fully NACE MR0175 / ISO 15156 compliant for sour-service exposure. Material class EE-0.5 per API 6A; body, stem, gate, and elastomers meet the NACE hardness and chemistry limits.  Provide a partial-pressure data sheet with H₂S, CO₂, and chloride values and we will confirm trim suitability.

Question 4

What does the API 6A material class mean?

Accepted Answer

Material class EE-0.5 per API 6A — this captures both the chemistry (sour-service grading: AA = standard, EE = sour with controlled hardness, HH = severe sour with high-alloy / cladded trim) and operating-temperature class. The "-0.5", "-1.5", and "-HF" suffixes indicate temperature ranges within the EE chemistry — refer to API 6A Table 5 / Table 6 for the exact temperature envelopes.

Question 5

What is the difference between FC (Fail Close) and FLS (Fail Last Stable)?

Accepted Answer

FC valves close automatically when hydraulic actuator pressure is lost — used for downstream isolation in safety-critical service (master valves, wing valves, kill lines). The internal spring drives the gate to the closed position when dome pressure drops below the spring set point.

Question 6

What materials are used for the body, gate, and seals?

Accepted Answer

Body: Forged AISI 4130 — NACE MR0175 compliant. Trim (gate + seats): F6NM gate + Inconel 625 overlay seats. Seals / elastomers: PEEK back-up + HNBR primary seals. Alternative trims (Inconel 718, F22, F51) and elastomers (FFKM, AFLAS) are available on request for higher-temperature or more aggressive sour environments.

Question 7

What is the lead time?

Accepted Answer

Typical lead time 70 working days ex-works. High-pressure (15K) and severe-sour (HH / EE-HF) variants are typically build-to-order — confirm the OEM build slot at quote stage. Hydrotest, sour-service, and API monogram certifications add 5-10 days to the dispatch window.

Question 8

What standards and certifications are supplied?

Accepted Answer

API 6A PSL 3 PR1, material class EE-0.5. Mill test reports per EN 10204 3.1 / 3.2 supplied with each unit. API monogram on body and trim. Plus NACE MR0175 / ISO 15156 sour-service compliance certificate.

Parameter	Value
Nominal Size	3-1/16 in
End Connection (Inlet)	3-1/16 in API 6A 15M Flanged (RTJ)
End Connection (Outlet)	3-1/16 in API 6A 15M Flanged (RTJ)
Bore Type	Full Port

Parameter	Value
Working Pressure	15000 psi
Pressure Class	15K
Service Class	Sour (NACE MR0175)

Parameter	Value
API Specification	API 6A
PSL Class	PSL 3
PR Class	PR1
Material Class (API 6A)	EE-0.5

Parameter	Value
Body Material	Forged AISI 4130 — NACE MR0175 compliant
Trim Material	F6NM gate + Inconel 625 overlay seats
Seal / Elastomer Material	PEEK back-up + HNBR primary seals

Hydraulic Gate Valve, Fail Close, 3-1/16 in × 15M Flanged, 15,000 psi, API 6A PSL 3 PR1, EE-0.5

Key features

Product description

Construction

Performance

Applications

Compliance

How to order

Companion products

Identification

Dimensions

Performance

Compliance

Construction

Shipping & lead time

Engineers viewing this also looked at

Hydraulic Gate Valve, Fail Close, 3-1/8 in × 5M Flanged, 5,000 psi, API 6A PSL 2 PR2, EE-0.5

Manual Gate Valve, Fail Close, 3-1/16 in × 15M Flanged, 15,000 psi, API 6A PSL 3 PR1, EE-0.5

Manual Gate Valve, Fail Close, 2-1/16 in × 10M Flanged, 10,000 psi, API 6A PSL 3 PR1, EE

Manual Gate Valve, FLS, 1-13/16 in × 15M Flanged, 15,000 psi, API 6A PSL 3G PR2, EE-1.5