Hydraulic FC and FLS Gate Valves for Wellhead and Manifold Systems

Description

Goldenman API 6A Hydraulic FC and FLS Gate Valves are full-bore isolation valves designed for wellhead systems, Christmas Trees, drilling manifolds, production manifolds and high-pressure fluid-control systems.

The valve uses a through-conduit slab gate that moves linearly between two matched floating seats. In the fully open position, the gate bore aligns with the valve bore to create a straight flow passage. In the fully closed position, the solid section of the gate isolates the upstream and downstream flow paths.

Available valve sizes include:

• 2-1/16 in
• 2-9/16 in
• 3-1/8 in for 5,000 psi configurations
• 3-1/16 in for 10,000 and 15,000 psi configurations
• 4-1/16 in

Available working-pressure classes include:

• 5,000 psi / 35 MPa
• 10,000 psi / 70 MPa
• 15,000 psi / 105 MPa

FC and FLS valves are supplied with hydraulic actuators for remote opening and closing. Manual handwheel, hydraulic fail-safe and double-acting actuator configurations are available for different well-control and production-control systems.

Product Short Description

Goldenman Hydraulic FC and FLS Gate Valves provide full-bore, bidirectional isolation for high-pressure oilfield service.

The forged valve body contains a precision-machined slab gate, two pressure-energized floating seats, replaceable stem packing, bonnet seals and a hydraulic linear actuator.

The valve is available in standard, sour-service, abrasive-service, low-temperature and high-temperature trim configurations. Complete assemblies are supplied with API flange or studded end connections, hydraulic control fittings, manual override, position indication and full pressure-test documentation.

Product Highlights

• API 6A wellhead and Christmas Tree gate valve
• FC-style and FLS-style valve configurations
• Hydraulic, manual and fail-safe actuator options
• Full-bore through-conduit slab gate
• Bidirectional pressure isolation
• Floating-seat sealing system
• Sizes from 2-1/16 to 4-1/16 in
• Working pressures from 5,000 to 15,000 psi
• API flanged or studded end connections
• Forged alloy-steel valve body and bonnet
• Replaceable gate, seats, stem and seal components
• Tungsten-carbide-coated gate and seat surfaces
• Pressure-energized seat sealing
• Stem packing replaceable during valve overhaul
• Grease and sealant injection fittings
• Hydraulic open and close control
• Manual override available
• Open and closed position indication
• Standard and sour-service trim packages
• PSL 1, PSL 2, PSL 3 and PSL 3G configurations
• PR1 and PR2 performance configurations
• Hydrostatic body and seat testing
• Material traceability and NDE documentation

Technical Specifications

Parameter	Available Configuration
Product	Hydraulic FC and FLS Gate Valve
Applicable standard	API Spec 6A
Valve design	Full-bore through-conduit slab gate
Valve styles	FC and FLS
Operation	Hydraulic, manual or hydraulic with manual override
Nominal bore sizes	2-1/16, 2-9/16, 3-1/8, 3-1/16 and 4-1/16 in
Working pressure	5,000, 10,000 and 15,000 psi
Pressure units	35, 70 and 105 MPa
Flow direction	Bidirectional
End connections	API flanged or studded
Gate type	Parallel slab gate
Seat type	Floating pressure-energized seats
Body construction	Forged alloy steel
Bonnet connection	Bolted bonnet
Stem type	Non-rotating linear stem
Hydraulic actuator	Double-acting or fail-safe piston actuator
Hydraulic control pressure	1,500 psi nominal; configurations available up to 3,000 psi
Manual override	Handwheel or hydraulic override arrangement
Gate material	Stainless steel or high-strength alloy steel
Gate coating	Tungsten carbide or WC-CoCr
Seat material	Stainless steel or alloy steel with hardened sealing faces
Stem material	High-strength corrosion-resistant stainless steel
Seal materials	NBR, HNBR, FKM and low-temperature elastomers
Backup rings	PTFE, modified PTFE or PEEK
Temperature classes	API 6A temperature-class configurations
Material classes	AA, BB, CC, DD, EE, FF and HH
Product Specification Level	PSL 1, PSL 2, PSL 3 and PSL 3G
Performance Requirement	PR1 and PR2
Service	Standard, sour, abrasive, low-temperature and high-temperature
Testing	Body, seat, stem-seal and actuator functional tests

Standard Size and Pressure Range

Nominal Bore	Working Pressure	Valve Type	End Connection
2-1/16 in	5,000 psi / 35 MPa	FC or FLS slab gate valve	API flange or studded
2-9/16 in	5,000 psi / 35 MPa	FC or FLS slab gate valve	API flange or studded
3-1/8 in	5,000 psi / 35 MPa	FC or FLS slab gate valve	API flange or studded
4-1/16 in	5,000 psi / 35 MPa	FC or FLS slab gate valve	API flange or studded
2-1/16 in	10,000 psi / 70 MPa	FC or FLS slab gate valve	API flange or studded
2-9/16 in	10,000 psi / 70 MPa	FC or FLS slab gate valve	API flange or studded
3-1/16 in	10,000 psi / 70 MPa	FC or FLS slab gate valve	API flange or studded
4-1/16 in	10,000 psi / 70 MPa	FC or FLS slab gate valve	API flange or studded
2-1/16 in	15,000 psi / 105 MPa	FLS high-pressure gate valve	API flange or studded
2-9/16 in	15,000 psi / 105 MPa	FLS high-pressure gate valve	API flange or studded
3-1/16 in	15,000 psi / 105 MPa	FLS high-pressure gate valve	API flange or studded
4-1/16 in	15,000 psi / 105 MPa	FLS high-pressure gate valve	API flange or studded

FC Gate Valve

The FC Gate Valve is a compact full-bore slab gate valve used in wellhead, Christmas Tree and manifold isolation service.

Its main components include:

• Forged valve body
• Bolted bonnet
• Parallel slab gate
• Two floating valve seats
• Valve stem
• Stem packing
• Bonnet seal
• Hydraulic or manual actuator
• Gate guides
• Seat seals and backup rings
• Grease and sealant fittings

The gate moves perpendicular to the flow passage and remains in continuous alignment with the valve seats.

The compact FC body is suitable for:

• Christmas Tree master valves
• Wing valves
• Swab valves
• Kill wing valves
• Wellhead side outlets
• Production manifolds
• Injection manifolds
• Test manifolds
• Choke and kill lines
• Drilling-fluid manifolds

FLS Gate Valve

The FLS Gate Valve is a heavy-duty through-conduit slab gate valve designed for high-pressure and severe-service applications.

The valve uses:

• Forged pressure-containing body
• Full-bore slab gate
• Floating pressure-energized seats
• Replaceable bonnet and stem seals
• Precision gate guides
• High-strength stem assembly
• Hydraulic linear actuator
• Manual override
• Position indicator
• Grease and sealant injection fittings

FLS configurations are used for:

• High-pressure Christmas Trees
• Surface wellheads
• Choke manifolds
• Kill manifolds
• Frac manifolds
• High-pressure injection systems
• Well-testing packages
• Drilling-pressure-control systems
• Production and workover manifolds

FC vs FLS Gate Valve

Feature	FC Gate Valve	FLS Gate Valve
Basic design	Compact through-conduit slab gate	Heavy-duty through-conduit slab gate
Pressure range	5,000–10,000 psi, with selected 15,000 psi configurations	5,000–15,000 psi
Main application	Wellhead, tree and general manifold isolation	High-pressure and severe-service isolation
Body construction	Forged compact body	Forged heavy-duty body
Gate system	Slab gate with floating seats	Slab gate with pressure-energized floating seats
Actuation	Manual or hydraulic	Manual, hydraulic or fail-safe
Trim replacement	Replaceable gate, seats and seals	Replaceable gate, seats, stem packing and seals
Service options	Standard, sour and abrasive	Standard, sour, abrasive and high-pressure
Direct interchangeability	FC internal dimensions	FLS internal dimensions

FC and FLS valves use different body, bonnet, gate, seat, stem and actuator dimensions. Replacement parts are identified by valve style, nominal bore, working pressure, material class and part number.

Through-Conduit Slab Gate Design

The slab gate contains a circular flow port matching the nominal valve bore.

Fully Open Position

When fully open:

• The gate port aligns with the body bore
• The flow path remains straight
• Pressure loss remains low
• Turbulence is reduced
• Well-intervention tools can pass through the valve
• Gate sealing surfaces remain protected between the seats

Fully Closed Position

When fully closed:

• The solid gate section moves between the seats
• The upstream and downstream flow paths are isolated
• Line pressure energizes the floating seats
• The gate and seat faces form the primary pressure barrier

The valve operates as an isolation valve in the fully open or fully closed position.

Hydraulic Actuator

The hydraulic actuator converts control-fluid pressure into linear force that moves the gate through the valve stroke.

The actuator assembly includes:

• Hydraulic cylinder
• Actuator piston
• Piston rod
• Stem adapter
• Hydraulic seals
• Open and close ports
• Position indicator
• Manual override
• Actuator housing
• Control fittings

Double-Acting Hydraulic Actuator

A double-acting actuator uses hydraulic pressure for both opening and closing.

Benefits include:

• Positive hydraulic opening
• Positive hydraulic closing
• Controlled operating speed
• Remote operation
• Integration with wellhead control panels
• Repeatable valve stroke
• Reduced manual operating effort

Fail-Safe Hydraulic Actuator

Fail-safe configurations use a spring, stored-energy system or hydraulic control arrangement to move the valve to a predetermined safe position when control pressure is lost.

Available actions include:

• Fail close
• Fail open
• Fail in last position

The fail-safe action is selected according to the valve’s position in the wellhead or manifold system.

Manual Override

The manual override provides local valve operation during:

• Hydraulic-power loss
• Commissioning
• Maintenance
• Control-system isolation
• Emergency operation

The override is mechanically connected to the actuator stem and includes a handwheel or screw mechanism.

Hydraulic Control System

The hydraulic control circuit includes:

• Hydraulic power unit
• Pressure regulator
• Directional control valve
• Open and close lines
• Accumulator
• Pressure gauge
• Isolation valve
• Relief valve
• Position feedback
• Emergency shutdown circuit

Standard hydraulic operating pressure is 1,500 psi. High-thrust actuator configurations operate with control pressures up to 3,000 psi.

The actuator piston area is sized to provide sufficient thrust for:

• Gate movement
• Seat friction
• Stem packing friction
• Differential-pressure load
• Low-temperature seal resistance
• Emergency closing requirements

Floating Seat System

The valve uses two floating seats installed on opposite sides of the slab gate.

Each seat contains:

• Metallic seat ring
• Gate-contact sealing face
• Body seal
• Elastomeric seal
• Backup rings
• Pressure-energizing area
• Retaining geometry

Line pressure pushes the seat toward the gate and increases the sealing force.

The floating-seat design provides:

• Bidirectional isolation
• Low-pressure sealing
• High-pressure sealing
• Replaceable internal trim
• Controlled gate contact
• Compensation for pressure and temperature changes

Gate and Seat Materials

Standard-Service Trim

Standard trim includes:

• Heat-treated stainless-steel gate
• Stainless-steel or alloy-steel seats
• Tungsten-carbide gate faces
• NBR or HNBR seat seals
• PTFE backup rings
• Corrosion-resistant stem

Abrasive-Service Trim

Abrasive trim includes:

• WC-CoCr-coated gate
• Hardened or coated valve seats
• Erosion-resistant flow edges
• HNBR or high-wear elastomer seals
• PEEK backup rings
• Hard-coated gate guides

This trim is used in:

• Drilling mud
• Sand-producing wells
• Frac fluids
• High-solids completion fluids
• High-velocity injection service

Sour-Service Trim

Sour-service trim includes:

• Controlled-hardness body and bonnet materials
• H₂S-resistant gate and seat materials
• Nickel-alloy or corrosion-resistant overlays
• HNBR or FKM seals
• Sour-service bolting
• Material traceability
• Hardness records

Corrosion-Resistant Trim

Corrosion-resistant options include:

• 410 stainless steel
• 420 stainless steel
• 17-4PH stainless steel
• Alloy 625 overlay
• Nickel-alloy stem and sealing components
• Electroless nickel coating
• Tungsten-carbide sealing surfaces

Stem Sealing System

The stem passes through the bonnet and transfers actuator force to the gate.

The stem sealing system includes:

• Primary stem packing
• Secondary packing
• Packing gland
• Lantern ring
• Grease or sealant injection port
• Stem wiper
• Backup rings
• Bonnet seal

The packing system isolates valve pressure while allowing linear stem movement.

Stem packing materials include:

• NBR
• HNBR
• FKM
• PTFE
• Modified PTFE
• PEEK

Grease and Sealant Injection

Grease fittings provide lubrication for:

• Stem packing
• Gate guides
• Seat movement
• Actuator interfaces

Emergency sealant injection ports provide temporary sealing support when the primary seat or stem seal is damaged.

Injection fittings include:

• Check valve
• Injection head
• High-pressure fitting
• Internal flow passage
• Protective cap

Sealant injection supports emergency valve operation and does not replace scheduled valve overhaul.

API 6A Product Configuration

Product Specification Level

Available configurations include:

• PSL 1
• PSL 2
• PSL 3
• PSL 3G

PSL selection defines material traceability, manufacturing controls, NDE, pressure testing and documentation.

Performance Requirement

Available configurations include:

• PR1
• PR2

PR2 valves include additional validation of operating and sealing performance.

Material Class

Available material classes include:

• AA
• BB
• CC
• DD
• EE
• FF
• HH

Material class is selected according to the produced fluid, corrosion conditions, H₂S, CO₂ and chloride content.

Temperature Class

Temperature configurations cover:

• Low-temperature land service
• Arctic service
• Standard oilfield temperatures
• High-temperature production
• Geothermal and thermal-recovery service

The valve body, gate, seats, actuator seals, stem packing and bonnet seals are supplied as one compatible temperature package.

End Connections

Available end connections include:

• API flanged ends
• API studded ends
• Flanged-by-studded combinations
• Equal-end configurations
• Combination pressure and bore configurations

Each connection includes:

• API ring groove
• Stud-hole pattern
• Flange thickness
• Bore transition
• End-face preparation
• Ring gasket
• Studs and nuts

Applications

Goldenman Hydraulic FC and FLS Gate Valves are used in:

• Surface wellheads
• Christmas Trees
• Master-valve positions
• Wing-valve positions
• Swab-valve positions
• Kill wing lines
• Choke manifolds
• Kill manifolds
• Mud manifolds
• Standpipe manifolds
• Frac manifolds
• Production manifolds
• Injection manifolds
• Well-testing systems
• Workover systems
• High-pressure flowlines
• Offshore platforms
• Sour-gas wells
• High-pressure gas wells
• Water-injection wells
• CO₂-injection systems

Valve Operation

The valve operates fully open or fully closed.

Partial opening creates:

• High local fluid velocity
• Gate erosion
• Seat washout
• Vibration
• Unstable actuator load
• Seal damage
• Reduced valve service life

The hydraulic control system moves the valve through its complete stroke and indicates the final open or closed position.

Differential pressure is equalized before opening the valve after extended shut-in service.

Installation

Installation includes:

1. Verify valve size, pressure rating and flow bore.
2. Inspect flange faces and ring grooves.
3. Clean the valve bore and end connections.
4. Install the correct API ring gasket.
5. Align the connected flanges without forcing the valve body.
6. Install and tighten studs using a controlled pattern.
7. Connect the hydraulic open and close lines.
8. Flush the actuator control lines.
9. Verify control pressure and relief settings.
10. Cycle the valve through full open and full close.
11. Confirm position-indicator movement.
12. Perform the required system pressure test.

The actuator remains vertical or within the approved installation orientation shown on the valve drawing.

Maintenance

Routine maintenance includes:

• Full-stroke functional cycling
• Hydraulic-control pressure inspection
• Actuator leakage inspection
• Position-indicator inspection
• Stem packing inspection
• Grease injection
• Sealant-fitting inspection
• Bonnet leakage inspection
• Flange and stud inspection
• External corrosion inspection
• Hydraulic hose inspection

Valve overhaul includes:

• Gate inspection
• Seat inspection
• Stem inspection
• Bonnet inspection
• Gate-guide inspection
• Actuator-cylinder inspection
• Piston-seal replacement
• Stem-packing replacement
• Seat-seal replacement
• Bonnet-seal replacement
• Pressure and functional testing

Replacement Parts

Goldenman supplies:

• Slab gates
• Valve seats
• Gate and seat sets
• Valve stems
• Stem packing
• Bonnet seals
• Seat seals
• Backup rings
• Gate guides
• Bonnet assemblies
• Hydraulic actuators
• Actuator pistons
• Actuator seal kits
• Position indicators
• Manual override assemblies
• Grease fittings
• Sealant injection fittings
• Studs and nuts
• API ring gaskets
• Complete valve trim kits

Manufacturing and Quality Control

Manufacturing and inspection include:

• Raw-material certificate verification
• Heat-number traceability
• Forging inspection
• Chemical-composition verification
• Mechanical-property testing
• Heat-treatment control
• Impact testing
• Hardness testing
• Body and bonnet dimensional inspection
• Flange dimensional inspection
• Ring-groove inspection
• Gate dimensional inspection
• Seat dimensional inspection
• Tungsten-carbide coating inspection
• Coating-thickness inspection
• Surface-finish inspection
• Ultrasonic testing
• Magnetic-particle testing
• Liquid-penetrant testing
• Stem and packing inspection
• Hydraulic-actuator assembly inspection
• Position-indicator functional test
• Final product marking inspection

Pressure and Functional Testing

Each completed valve undergoes:

• Hydrostatic body test
• Low-pressure seat test
• High-pressure seat test
• Upstream seat test
• Downstream seat test
• Bidirectional sealing test
• Stem-seal test
• Bonnet-seal test
• Hydraulic actuator test
• Full-stroke opening test
• Full-stroke closing test
• Manual override test
• Position-indicator test
• External leakage inspection
• Final dimensional inspection

Documentation

The product documentation package includes:

• Certificate of Conformity
• API documentation
• Product datasheet
• General assembly drawing
• Valve cross-section drawing
• Hydraulic actuator drawing
• Hydraulic control schematic
• Material certificates
• Heat-treatment records
• Mechanical-property reports
• Impact-test reports
• Hardness reports
• NDE reports
• Coating inspection report
• Dimensional inspection report
• Hydrostatic body-test report
• Seat-test report
• Stem-seal test report
• Hydraulic actuator test report
• Functional-cycle report
• Product traceability record
• Operation and maintenance manual
• Recommended spare-parts list
• Packing list
• Third-party inspection report

Frequently Asked Questions

What is the difference between an FC and FLS Gate Valve?

Both are full-bore slab gate valves.

The FC valve uses a compact body and internal trim arrangement for standard wellhead and manifold applications.

The FLS valve uses a heavy-duty body, bonnet, stem and actuator arrangement for high-pressure and severe-service applications.

Are FC and FLS internal parts interchangeable?

No.

Their gates, seats, stems, bonnets, seals and actuator interfaces use different dimensions.

Can the valve be manually operated?

Yes.

Hydraulic valves are available with handwheel or screw-type manual override systems.

What hydraulic pressure operates the valve?

Standard actuator control pressure is 1,500 psi. High-thrust actuator configurations are available for control pressures up to 3,000 psi.

Is the valve bidirectional?

Yes.

The slab gate and floating-seat system provide isolation from either flow direction.

Can the valve be used for throttling?

No.

FC and FLS Gate Valves are isolation valves and operate fully open or fully closed.

Are fail-safe actuators available?

Yes.

Available actions include fail close, fail open and fail in last position.

Are sour-service valves available?

Yes.

Sour-service configurations include controlled-hardness materials, H₂S-resistant trim, compatible elastomers and complete material documentation.

What is the purpose of tungsten-carbide coating?

Tungsten carbide improves resistance to abrasion, erosion, galling and repeated gate-to-seat contact.

Can the stem packing be replaced?

Yes.

The valve uses replaceable stem packing and bonnet sealing components.

Are gate and seat spare parts available?

Yes.

Goldenman supplies individual gates, seats, matched trim sets and complete valve overhaul kits.

What information identifies a replacement valve?

Valve identification includes the FC or FLS style, nominal bore, working pressure, end connections, actuator type, material class, temperature class and original part number.

Information Required for Quotation

Please provide:

• FC or FLS valve
• Hydraulic, manual or fail-safe operation
• Nominal bore
• Working pressure
• Flanged or studded end connections
• Upper and lower connection details
• Hydraulic control pressure
• Fail-open or fail-close action
• Manual override requirement
• Position-indicator requirement
• PSL
• Performance Requirement
• Material class
• Temperature class
• Service fluid
• H₂S concentration
• CO₂ concentration
• Chloride content
• Solids and sand content
• Minimum operating temperature
• Maximum operating temperature
• Required gate and seat coating
• Seal material
• Grease and sealant fittings
• Required spare-parts package
• Third-party inspection
• Documentation requirements
• Quantity
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies API 6A Hydraulic FC and FLS Gate Valves for wellhead, Christmas Tree, production-manifold and drilling-manifold systems.

Available configurations cover nominal bore sizes from 2-1/16 to 4-1/16 inches and working-pressure classes from 5,000 to 15,000 psi.

Complete valves are supplied with matched slab gates, floating seats, hydraulic actuators, manual overrides, position indicators, API end connections, inspection records and pressure-test documentation.

Email: info@goldenman.com