API 6A Manual Forged Gate Valves API 6A Slab Gate Valve for Oil & Gas

Specification

TIANYU API 6A Forged Gate Valves: Engineered for Oil & Gas Well Control

I. Product Overview

TIANYU 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.

Valve Details

V. Core Product Advantages

API 6A Compliance & Certification
- Certified to API Spec Q1 (9th edition), with PSL3/PR2 ratings for high-integrity well control.
- Fire-safe design (API 6FA) ensures sealing integrity during emergencies, meeting offshore safety standards.
Operational Versatility
- Mud valves excel in drilling fluid control, resisting abrasion from sand-laden mud (particle size ≤50μm).
- FC slab gates suit production manifolds, with full-bore design enabling pigging and pipeline inspection.
Global Service Support
- 1-year warranty covering material defects, with lifetime technical support for installation and maintenance.
- Interchangeable parts compatible with major oilfield equipment brands (e.g., Cameron, Vetco), reducing downtime.

Application

VI. Application Scenarios

Drilling Rigs: Mud circulation systems, choke & kill lines, preventing fluid loss during well control.
Production Facilities: Wellhead Christmas trees, flow control in separators and pipelines.
Workover Operations: Isolating wellbore during tubing repairs or perforation, withstanding high-pressure/high-temperature (HPHT) conditions.
Offshore Platforms: Corrosion-resistant stainless steel trims (316SS) for saltwater environments, certified for NACE MR0175.

VII. Customization & Service Offerings

Material Customization
- NACE-compliant alloys for H2S service (e.g., 13Cr stainless steel, Monel 400).
- Food-grade coatings for water injection systems, meeting NSF/ANSI 61 standards.
Functional Enhancements
- Actuator-ready designs (electric/pneumatic/hydraulic) with mounting pads per ISO 5211.
- Anti-static construction (stem-to-body grounding) for explosive atmospheres (ATEX/IECEx).
Logistics & After-Sales
- Fast delivery: 25-35 days for standard orders, 10-day expedited service for urgent requirements.
- On-site commissioning by certified technicians, with training programs with 3D simulation tools.

VIII. Industry Certifications & Compliance

API Spec 6A (21st edition) for design, testing, and marking.
API Monogram license (Q1-0500 equivalent), verified via API’s public database.
ASME B16.34 compliance for flange dimensions and pressure-temperature ratings.
CE certification (PED 2014/68/EU) for European markets, with DNV GL type approval available.