Specification

API 6A Manual Forged API 6A Slab Oil Gas Gate Valve

I. Product Overview

NEWWAY API 6A forged gate valves are precision-engineered for critical oil and gas well applications, adhering to American Petroleum Institute standards. Available in mud gate and FC slab gate configurations, these valves feature forged steel bodies with nominal diameters ranging from 2″ to 7-1/16″, supporting pressure classes up to 10,000 PSI. Designed for harsh downhole environments, they combine rugged durability with reliable sealing, suitable for drilling, well servicing, and production systems.

II. Core Technical Specifications

1. Mud Gate Valve Attributes

Size Range: 2″ – 4″ (DN50-DN100)

Pressure Rating: Medium pressure (up to 5,000 PSI)

Temperature Range: -46°C to 121°C (Level L-U)

Body Material: Forged carbon steel (4130/410), low-alloy steel or stainless steel trim

Seal Design: Metal-to-metal or soft seal options, NBR/PTFE secondary seals

Connections: Union, welding, threaded, or flanged (ASME B16.5/API 6A)

2. FC Slab Gate Valve Attributes

Size Range: 1-13/16″ – 7-1/16″

Pressure Classes: 2000 – 10,000 PSI

Product Spec Level (PSL): PSL1 to PSL4

Material Grades: 4130, 410, A487 4C, CA15 with TCC coating

Design Standards: API 6A, ASME VIII, API 6FA (fire safety)

End Connections: Flanged or welded (API 6D/ASME B16.10)

Product Overview

III. Structural Design & Technical Features

Forged Steel Construction

One-piece forged body and bonnet eliminate casting defects, achieving 40% higher tensile strength than cast valves (≥860MPa for 4130 steel).

Precision-machined wedge or slab gate design ensures bi-directional sealing, with floating seat rings that self-align to pressure fluctuations.

Full-Bore Through-Conduit Design

Unobstructed flow path reduces turbulence and pressure drop, ideal for solid-laden mud or well fluids.

Stem pin shear protection prevents internal damage from over-torque, with non-rising stem options for space-constrained installations.

Advanced Sealing Systems

Mud valves feature replaceable low-alloy steel seats with NBR backup rings, tested to API 598 for zero leakage.

FC slab gates use TCC (tungsten carbide coating) on seats, offering wear resistance in abrasive environments (hardness ≥HRC60).

IV. Manufacturing Processes & Quality Control

Forging & Heat Treatment

Hot forging at 1,100°C+ forms dense grain structure, followed by quenching and tempering (tempering temperature 650°C for 4130 steel).

Stress relief annealing reduces internal stresses, preventing cracking during service.

Non-Destructive Testing (NDT)

100% ultrasonic testing (UT) per API 6A 21st edition, detecting flaws ≥1.5mm in welds and forgings.

Hardness testing (HB220-260 for body, HB300+ for trim) ensures material consistency, verified by spectrometer analysis.

Pressure & Function Testing

Hydrostatic shell test at 1.5x working pressure for 30 minutes, with gas tightness test at 1.1x pressure.

Cycle testing (500+ operations) to validate stem sealing and gate alignment, documented in API-compliant test reports.