What is an API 6A valve?

An API 6A valve is a pressure control component used on wellheads and Christmas trees. It must comply with API Spec 6A to ensure safe operation under high pressure and sour service conditions.

What types of API 6A valves are available?

The main types include gate valves, check valves, choke valves, and plug valves, all designed for specific wellhead control applications.

Are your valves API certified?

Yes, all our valves are manufactured and tested in accordance with API Spec 6A, and can be provided with PSL, PR, and temperature class documentation.

Do you provide repair kits and spare parts?

Yes, repair kits and spare parts such as stems, seat rings, bonnets, and seals are available for all valve models.

What is your typical delivery time?

Standard delivery is 45–75 days depending on size, pressure rating, and material class.

API 6A Valves Manufacturer | Gate, Ball & Check Valves 2K-20K PSI

Goldenman Technical Guide · API 6A Wellhead Valves

API 6A Wellhead Valves: Types, Ratings, Materials & Selection

API 6A valves are pressure-control components used in wellhead and Christmas Tree systems. Correct selection requires more than matching bore size and working pressure: valve type, material class, temperature class, PSL, performance validation, actuation, sour-service conditions, end connections and testing requirements all matter.

2,000-20,000 psiCommon API 6A pressure classes

1-13/16 to 7-1/16 inCommon valve bore range

AA-HHMaterial classes by service requirement

API 6A 21st Ed.Current base edition listed by API

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Quick Answer

API 6A valves are valves used within wellhead and Christmas Tree equipment to isolate, control or prevent reverse flow of high-pressure oil, gas and well fluids. Common types include through-conduit slab gate valves, expanding gate valves, ball valves, check valves and choke valves. Selection normally requires the valve type, bore, pressure rating, temperature class, material class, PSL, performance requirement, service fluid, H2S/CO2 conditions, end connections and manual or hydraulic actuation to be defined together.

Goldenman API 6A wellhead gate valve for oil and gas Christmas Tree applications — Goldenman API 6A wellhead gate valve manufactured for high-pressure oil and gas service.

In This Guide

1. What is API Spec 6A?
2. Latest API 6A edition
3. API 6A valve types
4. Gate valves
5. Ball & check valves
6. Manual vs hydraulic
7. Pressure & bore ratings
8. Material classes AA-HH
9. PSL & PR
10. Pressure test setup
11. Valve selection
12. FAQ

What Is API Spec 6A?

API Specification 6A is the American Petroleum Institute specification for wellhead and tree equipment. It defines technical requirements for applicable pressure-containing and pressure-controlling equipment used at the wellhead, including product design, materials, manufacturing, quality controls, testing, marking and records.

For valve procurement, “API 6A” should not be treated as a complete specification by itself. Two valves can both be described as API 6A equipment while differing in nominal bore, working pressure, material class, temperature class, PSL, performance validation, actuation, end connection and sour-service configuration.

Procurement rule:
A technically complete valve enquiry should define the operating envelope and service environment first, then confirm the applicable API 6A product requirements and purchaser-specific documentation.

Current Standard Status

What Is the Latest Edition of API 6A?

As of 2026, API lists API Specification 6A, 21st Edition, as the current base edition. API’s published updates also list Addendum 4 issued in November 2024, together with previous addenda and errata for the 21st Edition.

The 21st Edition reorganized quality requirements, revised sizing tables, standardized product terminology, revised product-specific sections and changed several validation and quality-control requirements.

For current contractual work, buyers should confirm the edition, addenda, errata and project-specific invoked requirements directly from the official API publication source rather than relying on an old downloaded copy or an uncontrolled third-party PDF.

Types of API 6A Valves

Valve type should be selected from the required function in the wellhead or Christmas Tree. Isolation, rapid shutoff, reverse-flow prevention and controlled pressure reduction require different valve designs.

Valve Type	Main Function	Typical Wellhead Use	Operation
Slab Gate Valve	Full-bore isolation	Master, wing, swab, kill and manifold isolation	Linear
Expanding Gate Valve	Positive isolation	Wellhead and Christmas Tree isolation	Linear
Ball Valve	Fast quarter-turn isolation	High-pressure flow-control and auxiliary lines where specified	Quarter turn
Check Valve	Prevent reverse flow	Injection, test and pressure-control flow paths	Automatic
Choke Valve	Regulate pressure and flow	Production or well-control pressure regulation	Adjustable or fixed

Browse Goldenman API 6A Valve Series

Core Wellhead Isolation Valve

API 6A Gate Valves: Slab Gate and Through-Conduit Designs

In Goldenman’s wellhead and Christmas Tree range, API 6A gate valves are primarily through-conduit slab-gate designs rather than the wedge-gate construction commonly seen in general industrial piping valves.

API 6A gate valve manual handwheel and wellhead valve operation — Manual handwheel operation on a wellhead isolation valve.

The slab gate moves linearly between matched seats. When fully open, the gate bore aligns with the body bore to provide a straight through passage. When closed, the solid section of the gate moves between the seats to isolate the upstream and downstream flow paths.

DesignFull-bore through-conduit slab gate

FlowBidirectional isolation by configuration

ActuationManual, hydraulic or fail-safe

Goldenman API 6A FC and FLS Gate Valves cover common sizes from 2-1/16 to 4-1/16 in and pressure classes from 5,000 to 15,000 psi, with standard, sour, abrasive and temperature-specific trim options.

For overhaul and maintenance programs, Goldenman also supplies replacement slab gates and matched trim components for F and FC wellhead gate valves.

API 6A Ball Valves and Check Valves

Gate valves dominate many wellhead isolation duties, but ball and check valves serve different functions and should not be selected as direct substitutes without reviewing the equipment design and flow-control requirement.

API 6A Ball Valve

A ball valve uses a rotating ball with a flow bore. Quarter-turn operation provides rapid opening and closing. High-pressure designs may use floating or trunnion-mounted ball arrangements depending on size, pressure and product design.

Selection should confirm bore, pressure class, seat design, body construction, stem sealing, actuation, service fluid and project-specific API 6A requirements.

API 6A Check Valve

A check valve allows flow in the intended direction and closes against reverse flow. It is used where backflow could damage equipment, reverse a pressure-control function or compromise a test or injection line.

Important inputs include cracking behavior, pressure rating, flow direction, bore, trim material, sour-service conditions and the required sealing arrangement.

Manual vs Hydraulic API 6A Valves

Valve actuation is a system decision. The same isolation function can require local manual operation on one well and remote fail-safe operation on another.

Selection Factor	Manual Valve	Hydraulic / Fail-Safe Valve
Operation location	Local	Remote or local override
Typical duty	Accessible isolation points	Remote shutdown, SSV or automated duty
Control energy	Operator handwheel torque	Hydraulic pressure and actuator piston force
Key engineering input	Operating torque and accessibility	Required thrust, control pressure, fail position and closing time

Goldenman hydraulic FC/FLS gate valves are available with manual, hydraulic, double-acting and fail-safe actuator arrangements. Actuator sizing must account for gate movement, seat friction, stem-packing friction, differential-pressure load and temperature-related seal resistance.

View Hydraulic FC & FLS Gate Valves

API 6A Pressure Ratings and Common Valve Bore Sizes

Goldenman supplies API 6A wellhead valve and replacement configurations across commonly requested wellhead sizes and pressure classes. Not every size is available in every valve type, material class or pressure rating, so final availability should always be confirmed on the product datasheet.

Parameter	Common Goldenman Range	Buyer Check
Nominal bore	1-13/16, 2-1/16, 2-9/16, 3-1/8 / 3-1/16, 4-1/16, 5-1/8, 7-1/16 in depending on valve family	Match wellhead bore and connection
Working pressure	2,000, 3,000, 5,000, 10,000, 15,000 and 20,000 psi by product	Use project pressure envelope, not habit
Connections	API flanged, studded or project-specific connections	Confirm flange/hub type and gasket
Service	Standard, sour, abrasive, low- and high-temperature configurations	Provide actual H2S, CO2, chloride and temperature data

For flange dimensions, pressure classes and ring-gasket selection, use the dedicated API 6A Flange Dimensions, Pressure Ratings & Ring Gasket Chart.

API 6A Material Classes AA Through HH

Material class is one part of the API 6A equipment specification and should not be confused with temperature class. For procurement screening, the classes progress from general-service configurations toward increasingly corrosion-resistant and sour-service material requirements.

Material Class	General Procurement Direction	What Buyers Still Need to Define
AA	General-service material configuration	Fluid, pressure, temperature and project specification
BB	General service with upgraded internal material requirements	Trim and corrosion conditions
CC	General-service configuration with increased corrosion-resistant wetted materials	Produced-fluid chemistry
DD	Sour-service material direction	H2S partial pressure and NACE/ISO requirements
EE	Sour service with corrosion-resistant trim requirements	H2S, CO2, chloride and trim definition
FF	Sour/corrosive service with increased corrosion-resistant alloy use	CRA scope and seal compatibility
HH	Severe corrosive/sour-service CRA configuration	Full material, environment and project review

Important: Material class alone does not prove suitability for a sour well. H2S, CO2, chloride content, pressure, temperature, hardness restrictions, trim materials, overlays, elastomers and applicable NACE MR0175 / ISO 15156 requirements still have to be reviewed.

API 6A Temperature Class Is Different From Material Class

Temperature classes define the equipment temperature envelope. They should not be mixed with material classes AA-HH. For example, a designation such as U is a temperature-class designation, not an API 6A material class.

When requesting a valve, Goldenman recommends providing both the required API temperature class or actual operating/test temperatures and the required material class. Seal compounds and backup materials are then selected to suit the pressure, temperature and fluid environment.

PSL 1, PSL 2, PSL 3, PSL 3G and PSL 4: What Buyers Need to Know

Under the current API 6A structure, applicable equipment is specified as PSL 1, PSL 2, PSL 3 or PSL 4. PSL 3G is a supplemental designation for qualifying PSL 3 equipment that satisfies the applicable additional gas-testing requirements; it should not be treated as a fifth independent PSL.

PSL affects manufacturing quality controls, materials, inspection, testing, traceability and records. It does not replace proper selection of pressure rating, material class, temperature class, service medium or performance-validation requirements.

Dedicated PSL Guide
For the detailed PSL comparison, maintenance implications, testing and common procurement mistakes, read our API 6A PSL Levels Explained: How PSL Requirements Affect Valve Selection.

PR1 vs PR2

Performance requirements address product-design performance validation. Buyers should confirm whether the applicable product and project require PR1, PR2 or another defined validation requirement. A higher performance requirement should be selected because it is required by the product/project specification, not simply because it sounds more conservative.

Factory Verification

What Pressure Test Setup Is Needed for API 6A Valve Testing?

A practical API 6A valve test station needs a controlled pressure source, secure test fixture, calibrated measurement instruments, defined body or seat test boundary, leakage monitoring, safe isolation and a traceable test record. Exact test pressures, hold periods, media and acceptance criteria depend on the applicable product requirements and project specification.

Goldenman API 6A valve pressure testing setup and high pressure valve test fixture — Goldenman pressure-test fixture used for high-pressure valve verification and quality control.

1. Pressure SourceControlled hydrostatic or gas-pressure source where applicable.

2. Test ManifoldRated valves, tubing and fittings for safe pressure routing.

3. Calibrated InstrumentsPressure transducers or gauges with valid calibration.

4. Test FixtureFlanged/studded fixture that safely contains the test load.

5. Leakage MonitoringObserve pressure stability and allowed leakage at the required boundary.

6. Test RecordRecord valve identity, test medium, pressure, time, result and instrument traceability.

Routine production acceptance testing should also be distinguished from design validation, project-specific gas testing, fire testing and fugitive-emission qualification. Buyers should define which tests are contractually required before manufacturing starts.

How API 6A Valves Fit Into a Wellhead and Christmas Tree

Valve requirements depend on where the valve is installed. A master valve, wing valve, swab valve, kill-wing valve or remotely operated surface safety valve may require different actuation, fail position, trim and service conditions even when the pressure class is the same.

Goldenman API 6A wellhead and Christmas Tree gate valve assemblies in factory — Goldenman wellhead and Christmas Tree valve assemblies for oil and gas production systems.

For a complete system view, see Goldenman’s API 6A Christmas Tree and wellhead equipment, which can be configured by pressure rating, bore, valve arrangement, material class, temperature class, PSL, performance requirements and sour-service conditions.

How to Select an API 6A Valve

Goldenman recommends reviewing the full service requirement before choosing a valve model. A reliable procurement sequence is:

1. Valve FunctionIsolation, reverse-flow prevention, rapid shutoff or pressure regulation.

2. Nominal BoreMatch the required through-bore and connected wellhead equipment.

3. Working PressureUse the project pressure envelope and wellhead system rating.

4. TemperatureConfirm API temperature class and actual operating/test range.

5. Material ClassSelect AA-HH from fluid chemistry and corrosion/service requirements.

6. Sweet or Sour ServiceProvide H2S, CO2, chlorides and applicable NACE/ISO requirements.

7. PSL & PerformanceDefine required PSL and product/project validation requirements.

8. End ConnectionsConfirm flange, studded or other specified connection and gasket system.

9. ActuationManual, hydraulic, double-acting or fail-safe, including required fail position.

10. Testing & DocumentationConfirm ITP, NDE, pressure testing, third-party inspection and records before production.

Common API 6A Valve Selection Mistakes

Selecting only by pressure ratingPressure class does not define material, temperature, PSL, trim, actuation or end connection.

Confusing PSL with pressure classPSL addresses technical quality requirements; it is not a pressure rating.

Confusing material and temperature classAA-HH and temperature designations describe different specification dimensions.

Writing only “H2S service”Actual H2S, CO2, chloride, temperature and pressure data are needed for material review.

Specifying PR2 automaticallyPerformance validation should follow the applicable product and project requirements.

Ignoring actuator fail positionRemote hydraulic valves must be selected with the required control logic and safe-state function.

Goldenman Manufacturing View

API 6A Valve Manufacturing, Inspection and Testing at Goldenman

For Goldenman, an API 6A valve quotation is not complete until the service conditions, valve configuration and required inspection package have been reviewed together. We manufacture and supply wellhead valves, hydraulic gate valves, valve trim and related wellhead equipment for international oil and gas projects.

Goldenman API 6A valve dimensional inspection and quality control in factory — Dimensional and surface inspection of valve components during Goldenman manufacturing quality control.

Material TraceabilityHeat-number, MTC and material-class documentation review.

Machining ControlBody, bonnet, gate, seat, stem and sealing-interface dimensional checks.

NDE & HardnessInspection scope according to the product, PSL and approved quality plan.

Pressure TestingBody, seat, stem-seal and functional testing as applicable.

Actuator FunctionOpen/close stroke, manual override and fail-safe function where specified.

Third-Party WitnessCustomer or independent inspection points can be included in the ITP.

Need an API 6A Valve Datasheet or Technical Quotation?

Send Goldenman the valve type, bore, working pressure, temperature class, material class, PSL, performance requirement, H2S/CO2 conditions, end connections, actuation and required inspection documentation. We will review the specification before quotation.

Request API 6A Valve Quote
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Frequently Asked Questions About API 6A Valves

What does API 6A mean?

API 6A refers to the American Petroleum Institute specification for wellhead and tree equipment. It defines requirements for applicable products including design, materials, manufacturing, testing, quality control, marking and records.

What is the latest edition of API 6A?

As of 2026, API lists API Spec 6A, 21st Edition, as the current base edition. API also lists subsequent addenda and errata, including Addendum 4 issued in November 2024. Project teams should verify the currently invoked edition and updates from the official API source.

What are API 6A valves?

API 6A valves are pressure-control valves used in wellhead and Christmas Tree equipment. Common functions include isolation, reverse-flow prevention and pressure/flow regulation.

What pressure ratings are available for API 6A valves?

Common wellhead valve pressure classes include 2,000, 3,000, 5,000, 10,000, 15,000 and 20,000 psi depending on valve family and configuration. Not every valve type is available in every pressure class.

What is PSL 3G in API 6A?

Under the current API 6A structure, PSL 3G is a supplemental designation for qualifying PSL 3 equipment that satisfies applicable additional gas-testing requirements. It is not a separate fifth PSL.

What is PR2 in API 6A?

PR2 is a product performance-validation designation used where applicable. Buyers should confirm the product-specific and project-specific requirement rather than assuming PR2 is automatically required for every API 6A valve.

What are API 6A material classes AA through HH?

AA through HH are material classes used to define material requirements for different service environments. The selection progresses from general-service configurations toward sour and more corrosive service, but actual H2S, CO2, chlorides, pressure, temperature and project requirements must still be reviewed.

What is the difference between API 6A and API 6D valves?

API 6A applies to wellhead and tree equipment, while API 6D addresses pipeline and piping valves. The product scope, design context and testing requirements are different.

What pressure test setup is used for API 6A valves?

A controlled pressure source, rated test manifold, secure valve fixture, calibrated pressure instruments, defined test boundary, leakage monitoring, safety isolation and traceable test records are required. The exact procedure depends on the valve, specification and project requirements.

Are hydraulic actuators used with API 6A gate valves?

Yes. Hydraulic actuators are commonly used where remote operation, emergency shutdown or fail-safe action is required. Actuator thrust, control pressure, fail position and manual override should be matched to the valve design and operating conditions.

What information should I provide to order an API 6A valve?

Provide valve type, bore, working pressure, top/bottom or end connections, temperature class, material class, PSL, performance requirement, fluid composition, H2S and CO2 content, chloride concentration, actuation, inspection requirements, quantity and destination.

Related API 6A Resources

API 6A PSL Levels Explained →
API 6A Flange Dimensions →
Hydraulic FC & FLS Gate Valves →
F & FC Replacement Slab Gates →
API 6A Christmas Tree Equipment →
API 6A Valve Series →

2 Responses

Kesari Alloys says:

August 12, 2026 at 6:48 pm

The mention of the five Product Specification Levels (PSLs) in API 6A is particularly important, as it really helps procurement teams match the right valve to specific service conditions. However, it would be useful to elaborate on how the PSLs impact maintenance strategies in the field, especially considering the rigorous testing requirements like the Design Validation Tests and fugitive emission tests mentioned. Are there common pitfalls that companies encounter when selecting valves based on these specifications?

1. Goldenman says:
  
  August 25, 2026 at 5:48 pm
  
  Thank you for your thoughtful comment. You raised an important point: API 6A PSL selection affects not only procurement and manufacturing requirements, but also long-term maintenance planning, traceability, spare-parts strategy, and lifecycle reliability in the field.
  
  We agree that one of the most common pitfalls is selecting a valve based mainly on pressure rating, price, or PSL designation without fully considering service conditions, material class, testing requirements, sour-service requirements, and future maintenance needs.
  
  Based on this discussion, we have expanded the topic in a dedicated guide covering API 6A PSL requirements, maintenance considerations, testing, and common valve-selection mistakes:
  
  **API 6A PSL Levels Explained: How PSL Requirements Affect Valve Selection**
  
  We appreciate your input—it helped us address the topic from a more practical engineering and procurement perspective.