Replacement Slab Gates for F and FC Wellhead Gate Valves

Description

Goldenman manufactures replacement slab gates, valve seats and trim components for F- and FC-style API 6A gate valves used in wellhead systems, Christmas trees, production manifolds, drilling manifolds and pressure-control equipment.

The product range covers manual and hydraulically actuated gate valves with nominal bore sizes from 1-13/16 to 7-1/16 inches and parent-valve pressure classes from 2,000 to 20,000 psi.

Each gate is machined to the required valve design, bore, pressure class, stem connection, gate thickness, seat interface, material class and service condition.

Goldenman supplies:

• Individual replacement gates
• Matched gate and seat sets
• Complete valve trim kits
• Gates manufactured from verified part numbers
• Gates manufactured from dimensional drawings
• Reverse-engineered replacements from unused samples
• Standard-service and sour-service materials
• Abrasion-resistant and corrosion-resistant surface treatments
• Replacement parts for manual and hydraulic F/FC valve configurations

Product Short Description

Goldenman F and FC Gate Valve Gates are precision-machined pressure-control components designed to move linearly between matched valve seats.

When the valve is fully open, the gate bore aligns with the valve flow passage to provide an unrestricted through conduit. When the valve is fully closed, the solid gate section moves between the seats to isolate the pressure.

Gate faces are ground and finished for controlled contact with the seat sealing surfaces. Material, heat treatment, coating and seal configuration are selected for the required pressure, temperature, fluid composition, abrasion level and H₂S exposure.

Product Highlights

• Replacement gates for F- and FC-style gate valves
• Designed for API 6A wellhead and Christmas Tree applications
• Nominal bore sizes from 1-13/16 to 7-1/16 in
• Parent-valve pressure classes from 2,000 to 20,000 psi
• Manual and hydraulic valve applications
• Full-bore slab-gate construction
• Bidirectional isolation configurations
• Precision-ground parallel sealing faces
• Controlled gate thickness and flatness
• Matched gate and floating-seat sets
• Alloy-steel and stainless-steel material options
• Tungsten-carbide wear-resistant coatings
• Nickel-alloy corrosion-resistant overlays
• Standard and sour-service trim options
• Low- and high-temperature seal packages
• Replacement by part number, drawing or sample
• Dimensional and coating inspection
• Hardness and material traceability
• Contact-pattern inspection
• Complete valve trim and seal kits

General Technical Specifications

Parameter	Available Configuration
Product	F and FC Gate Valve Gate
Product type	Full-bore slab gate
Application	Manual and hydraulic wellhead gate valves
Parent-valve standard	API Spec 6A
Nominal bore range	1-13/16–7-1/16 in
Parent-valve pressure classes	2,000, 3,000, 5,000, 10,000, 15,000 and 20,000 psi
Valve styles	F style and FC style
Flow direction	Bidirectional
Operating movement	Linear
Gate connection	Model-specific stem or gate-pin interface
Gate materials	Alloy steel, martensitic stainless steel and precipitation-hardening stainless steel
Common material options	AISI 410, AISI 420, 17-4PH, 4130 and 4140
Surface treatments	Tungsten carbide, WC-CoCr, electroless nickel and nickel-alloy overlay
Seat materials	Heat-treated stainless steel or alloy steel
Seal materials	NBR, HNBR, FKM and low-temperature elastomers
Backup materials	PTFE, modified PTFE and PEEK
Service	Oil, gas, water, drilling fluid, completion fluid and injection service
Sour service	Available for H₂S-containing environments
Identification basis	Valve model, bore, pressure class, part number and dimensions
Supply form	Gate only, gate-and-seat set or complete trim kit

Available Bore Sizes

Goldenman manufactures gates for the following common F and FC valve bore sizes:

• 1-13/16 in
• 2-1/16 in
• 2-9/16 in
• 3-1/8 in
• 3-1/16 in
• 4-1/16 in
• 5-1/8 in
• 7-1/16 in

The 3-1/8-inch and 3-1/16-inch designations belong to different valve configurations and are manufactured as separate products.

A gate is identified by the complete valve configuration rather than nominal bore alone.

Available Pressure Classes

Replacement gates and trim sets are manufactured for valves in the following pressure classes:

• 2,000 psi
• 3,000 psi
• 5,000 psi
• 10,000 psi
• 15,000 psi
• 20,000 psi

The gate is part of the complete valve pressure-containing and sealing system.

The working-pressure rating applies to the assembled valve body, bonnet, gate, seats, stem, seals, end connections and bolting.

F-Style Gate Valve Gate

The F-style replacement gate is manufactured for the internal geometry of F-pattern manual gate valves.

Its dimensional configuration includes:

• Full flow bore
• Parallel gate faces
• Stem-connection feature
• Gate guide surfaces
• Seat-contact surfaces
• Upper and lower travel areas
• Model-specific gate thickness
• Pressure-balancing and seal geometry

F-style gates are supplied according to:

• Valve nominal bore
• Valve pressure class
• Stem type
• Gate length
• Gate width
• Gate thickness
• Flow-bore diameter
• Seat outside and inside diameters
• Material class
• Temperature class
• Service fluid

FC-Style Gate Valve Gate

The FC-style replacement gate is designed for through-conduit FC gate valves using a slab gate and matched floating-seat arrangement.

The full-bore gate passage aligns with the valve bore in the open position.

The solid section of the gate moves between the seats in the closed position to provide pressure isolation.

FC-style gate features include:

• Full-bore flow passage
• Parallel sealing faces
• Guided linear movement
• Model-specific stem connection
• Matched floating-seat contact
• Bidirectional pressure isolation
• Replaceable trim construction
• Low flow restriction in the fully open position

FC gates are supplied for both manual and hydraulic valve assemblies using the same internal gate configuration.

F Gate vs FC Gate

Feature	F-Style Gate	FC-Style Gate
Valve family	F-pattern valve	FC-pattern valve
Gate construction	Model-specific slab gate	Through-conduit slab gate
Stem connection	F-design interface	FC-design interface
Gate width and thickness	F-body dimensions	FC-body dimensions
Seat interface	F-design seats	FC floating seats
Guide profile	F valve body geometry	FC valve body geometry
Replacement basis	F valve part number or drawing	FC valve part number or drawing
Direct interchangeability	Not interchangeable by bore alone	Not interchangeable by bore alone

An F gate and an FC gate with the same nominal bore and pressure class can have different:

• Gate thickness
• Overall length
• Flow-port position
• Stem connection
• Guide dimensions
• Seat-contact diameter
• Surface finish
• Seal arrangement

Goldenman manufactures each gate to the corresponding valve design.

Gate and Seat Sealing System

The gate and seats form the primary pressure-isolation system inside the valve.

A matched set controls:

• Gate-to-seat contact
• Seat preload
• Pressure energization
• Flow-bore alignment
• Opening and closing force
• Low-pressure sealing
• High-pressure sealing
• Bidirectional isolation

The seat assembly can include:

• Metallic seat ring
• Gate-contact sealing face
• Body seal
• Elastomeric seal
• PTFE or PEEK backup ring
• Seat spring or energizing element
• Retaining feature
• Lubrication or sealant groove

Matched gate and seat sets provide consistent surface geometry, coating compatibility and contact patterns.

Slab Gate Operating Principle

The gate moves vertically through the valve body.

Fully Open Position

In the fully open position:

• The gate bore aligns with the valve bore
• The flow passage remains unobstructed
• Pressure loss is minimized
• Tools can pass through full-bore valve configurations
• Gate sealing faces remain protected between the seats

Fully Closed Position

In the fully closed position:

• The solid gate section moves between the seats
• The upstream and downstream passages are isolated
• Line pressure energizes the seat system
• The gate and seats form the pressure barrier

F and FC gate valves are isolation valves.

They operate in the fully open or fully closed position and are not used as throttling valves.

Gate Material Options

Martensitic Stainless Steel

AISI 410 and AISI 420 stainless steels provide:

• High mechanical strength
• Heat-treatment capability
• Controlled hardness
• Wear resistance
• Compatibility with hard coatings
• Resistance to general production-fluid corrosion

These materials are widely used for standard gate and seat trim applications.

17-4PH Stainless Steel

17-4PH provides:

• High strength
• Stable heat-treated properties
• Good dimensional stability
• Corrosion resistance
• Wear-resistant substrate for coated gates

It is used in high-strength and corrosion-resistant trim configurations.

Low-Alloy Steel

AISI 4130 and 4140 provide:

• High strength
• Toughness
• Machinability
• Heat-treatment flexibility
• Suitable substrate for corrosion-resistant overlays and hard coatings

Low-alloy-steel gates use a service-specific surface protection system.

Nickel-Alloy Trim

Nickel-alloy overlay or nickel-alloy gate material is used for:

• Sour gas
• CO₂-containing production
• Chloride exposure
• Corrosive injection fluids
• High-temperature production
• Severe chemical service

Available nickel-based materials include Alloy 625 and equivalent corrosion-resistant alloys.

Wear-Resistant Surface Coatings

Tungsten Carbide Coating

Tungsten-carbide coatings provide:

• High surface hardness
• Abrasion resistance
• Erosion resistance
• Resistance to repeated seat contact
• Reduced galling
• Extended sealing-surface life

Available systems include:

• WC-Co
• WC-CoCr
• HVOF-applied tungsten carbide

Nickel-Based Coating

Nickel-based coatings provide:

• Corrosion resistance
• Uniform surface protection
• Improved resistance to produced fluids
• Protection of low-alloy-steel substrates
• Compatibility with precision grinding and lapping

Combined Corrosion and Wear Protection

Severe-service gates use a corrosion-resistant substrate or overlay combined with a wear-resistant sealing surface.

This configuration is used in:

• Sour gas service
• Sand-producing wells
• High-velocity injection service
• Abrasive drilling-fluid service
• High-cycle valve operation

Gate Face Finish

Gate sealing performance depends on the geometry and finish of both parallel faces.

Manufacturing controls include:

• Face flatness
• Face parallelism
• Surface roughness
• Coating thickness
• Coating uniformity
• Bore concentricity
• Gate thickness
• Edge profile
• Stem-interface position
• Contact-pattern accuracy

The gate faces are precision ground and lapped after heat treatment and coating.

Sharp edges are controlled to prevent damage to seat seals during assembly and operation.

Stem and Gate Connection

The stem transfers handwheel or actuator movement to the gate.

Common gate interfaces include:

• Gate pin
• T-slot
• Stem adapter
• Threaded connection
• Retaining plate
• Model-specific mechanical coupling

The gate connection is manufactured to carry:

• Opening force
• Closing force
• Seat friction
• Differential-pressure load
• Repeated operating cycles
• Stem side load

The connection profile forms part of the gate identification data.

Manual and Hydraulic Valve Applications

The same internal gate design can be used in manual and hydraulically actuated valves when the valve body, seats and stem interface are identical.

Manual Gate Valves

Manual valves use:

• Handwheel
• Stem nut
• Bearing assembly
• Rising or non-rising stem mechanism
• Mechanical position indication

Hydraulic Gate Valves

Hydraulic valves use:

• Hydraulic actuator
• Piston and cylinder
• Hydraulic stem
• Fail-safe or double-acting arrangement
• Position indicator
• Manual override where included

Goldenman supplies gate components for both actuator arrangements.

Service Applications

F and FC Gate Valve Gates are used in:

• Surface wellheads
• Christmas Trees
• Master valves
• Wing valves
• Swab valves
• Kill wing valves
• Production manifolds
• Injection manifolds
• Test manifolds
• Choke manifolds
• Kill manifolds
• Mud manifolds
• Standpipe manifolds
• High-pressure flowlines
• Well-testing equipment
• Workover pressure-control equipment

Fluid Compatibility

Gate materials, coatings and seat seals are available for:

• Crude oil
• Natural gas
• Produced water
• Fresh water
• Salt water
• Drilling fluid
• Completion fluid
• Workover fluid
• Injection water
• Chemical injection fluid
• CO₂-containing production
• H₂S-containing production
• Sand-bearing production fluids

The trim configuration is defined by pressure, temperature, fluid chemistry, solids content and operating frequency.

Standard-Service Trim

Standard-service trim combines:

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

It is used for conventional oil, gas and water service.

Sour-Service Trim

Sour-service trim uses:

• Controlled-hardness materials
• H₂S-resistant metallic components
• Nickel-alloy or corrosion-resistant surfaces
• HNBR, FKM or sour-service elastomers
• Service-specific backup rings
• Material traceability
• Heat-treatment documentation
• Hardness inspection

The gate and seats are supplied to the parent valve’s API 6A material class and sour-service specification.

High-Temperature Trim

High-temperature configurations use:

• Heat-resistant metallic trim
• FKM, AFLAS or high-temperature elastomer seals
• PEEK backup rings
• Temperature-resistant stem packing
• High-temperature lubricant

The complete trim system is supplied as one compatible material package.

Low-Temperature Trim

Low-temperature configurations include:

• Impact-tested metallic components
• Low-temperature elastomers
• Controlled heat treatment
• Low-temperature lubricant
• Low-temperature material documentation

The temperature class is carried through the gate, seat seals, stem packing and bonnet sealing system.

Gate Valve Trim Kits

Complete trim kits include:

• Gate
• Two valve seats
• Seat seals
• Seat backup rings
• Stem packing
• Bonnet seal ring
• Gate pin
• Stem adapter
• Retainer plate
• Bearing spacer
• Packing gland seals
• Model-specific O-rings

Supplying a complete trim kit creates a consistent replacement system for valve overhaul.

Replacement Identification

Goldenman identifies replacement gates using:

• Valve manufacturer
• Valve style
• Valve model
• Nominal bore
• Working pressure
• Manual or hydraulic operation
• Existing gate part number
• Seat part numbers
• Gate overall length
• Gate width
• Gate thickness
• Flow-bore diameter
• Stem-connection dimensions
• Seat-contact diameter
• Material class
• Temperature class
• Service fluid

Replacement gates are manufactured from an approved drawing, verified dimensions or an unused sample.

Common Gate Failure Modes

Gate Face Scoring

Scoring results from:

• Sand and solid particles
• Damaged valve seats
• Operation under differential pressure
• Contaminated sealant
• Corrosion products
• Insufficient surface hardness

Erosion and Washout

Erosion occurs when the valve operates partially open or leaks across a damaged sealing surface.

High-velocity fluid cuts channels into the gate or seat and progressively increases leakage.

Coating Damage

Coating damage includes:

• Chipping
• Cracking
• Spalling
• Local wear
• Corrosion beneath the coating
• Poor adhesion

Galling

Galling develops from direct metal contact, excessive friction, unsuitable material pairing or inadequate surface finish.

Stem-Connection Wear

The gate pin, T-slot or stem connection wears from repeated cycling, misalignment and excessive operating force.

Corrosion Pitting

Pitting damages the sealing face and prevents uniform seat contact.

Corrosion-resistant trim eliminates rapid degradation in aggressive service.

Valve Operation

F and FC gate valves are operated fully open or fully closed.

Partial opening creates:

• High local fluid velocity
• Gate-face erosion
• Seat washout
• Vibration
• Unstable operating torque
• Seal damage
• Reduced service life

Pressure is equalized across the gate before opening valves operating under high differential pressure.

Inspection During Valve Overhaul

Gate inspection covers:

• Sealing-face condition
• Coating condition
• Flatness
• Parallelism
• Gate thickness
• Flow-bore condition
• Guide-surface wear
• Stem-connection wear
• Corrosion
• Erosion
• Cracks
• Mechanical deformation

Seat inspection covers:

• Contact-face wear
• Body-seal condition
• Backup-ring condition
• Seat movement
• Corrosion
• Erosion
• Cracking
• Coating condition

A worn gate and seat set is replaced as a matched trim assembly.

Manufacturing Process

Goldenman gate manufacturing includes:

1. Material identification
2. Rough machining
3. Heat treatment
4. Mechanical-property inspection
5. Finish machining
6. Gate bore machining
7. Stem-interface machining
8. Surface preparation
9. Hard coating or corrosion-resistant overlay
10. Precision grinding
11. Lapping
12. Dimensional inspection
13. Surface-finish inspection
14. NDE
15. Contact-pattern inspection
16. Cleaning and preservation
17. Product identification
18. Export packaging

Quality Control and Testing

Quality control includes:

• Raw-material certificate review
• Heat-number traceability
• Chemical-composition verification
• Mechanical-property verification
• Heat-treatment record review
• Hardness testing
• Dimensional inspection
• Flatness measurement
• Parallelism measurement
• Surface-roughness inspection
• Coating-thickness measurement
• Coating-adhesion inspection
• Magnetic-particle inspection
• Liquid-penetrant inspection
• Gate-to-seat contact inspection
• Flow-bore alignment inspection
• Stem-interface inspection
• Final visual inspection

Complete valve assemblies undergo:

• Hydrostatic shell testing
• Low-pressure seat testing
• High-pressure seat testing
• Bidirectional sealing testing
• Operating-cycle testing
• Stem-seal testing
• Functional opening and closing tests

Product Documentation

The supply package includes:

• Certificate of Conformity
• Product datasheet
• Gate dimensional drawing
• Gate and seat assembly drawing
• Material certificate
• Heat-treatment record
• Mechanical-property report
• Hardness report
• Coating report
• Coating-thickness report
• Dimensional inspection report
• Surface-finish report
• NDE report
• Contact-pattern inspection record
• Batch traceability record
• Packing list

Complete trim and valve orders include applicable pressure and functional test reports.

Storage and Handling

Gates are packaged with protection for:

• Parallel sealing faces
• Hard coatings
• Flow-bore edges
• Stem connection
• Identification markings
• Corrosion-sensitive surfaces

Storage conditions include:

• Clean indoor storage
• Original protective packaging
• Dry environment
• Protection from impact
• Protection from abrasive contamination
• Separation of coated sealing faces
• Clear part-number identification

The sealing faces remain protected until valve assembly.

Frequently Asked Questions

Is this product a complete API 6A Gate Valve?

This page covers replacement gates, seats and trim components for F- and FC-style gate valves.

Complete manual and hydraulic API 6A Gate Valves are supplied under Goldenman’s FC Gate Valve product range.

What is the difference between a gate and a valve plate?

Gate is the correct oilfield valve term.

The component is also called a slab gate or gate plate, but “gate” is the primary technical and commercial name.

Can an F gate replace an FC gate with the same bore?

No.

F and FC gates use different valve-body, seat, guide and stem-interface dimensions. Each gate is manufactured for its specific valve design.

Can the gate be used in both manual and hydraulic valves?

Yes.

A gate fits manual or hydraulic valves when the valve body, seat arrangement and gate-to-stem interface use the same internal design.

Are the gate and seats supplied separately?

Goldenman supplies the gate individually, a matched gate-and-seat set or a complete valve trim kit.

What gate materials are available?

Available materials include heat-treated 410 and 420 stainless steel, 17-4PH stainless steel and high-strength alloy steel with corrosion- and wear-resistant surface treatments.

What coatings are available?

Available sealing-face treatments include HVOF tungsten carbide, WC-CoCr, electroless nickel and nickel-alloy corrosion-resistant overlay.

Are sour-service gates available?

Yes.

Sour-service gates use controlled-hardness materials, corrosion-resistant surfaces and matched seat seals for H₂S-containing environments.

Can one gate fit different pressure classes?

No.

Pressure class affects gate dimensions, thickness, seat geometry, stem loading and material configuration.

Can the valve be operated partially open?

F and FC gate valves are isolation valves and operate fully open or fully closed.

Partial operation causes erosion of the gate and seats.

What causes a new gate to leak?

Leakage results from damaged seats, incorrect gate dimensions, debris, mismatched sealing faces, coating damage, incorrect assembly or worn valve-body seat pockets.

Can a gate be manufactured from an old sample?

Goldenman manufactures replacements from an unused sample, an approved drawing or a complete dimensional inspection record.

A worn sample is combined with valve-body and seat measurements to restore the original design dimensions.

Information Required for Quotation

Please provide:

• Valve manufacturer
• Valve style: F or FC
• Manual or hydraulic operation
• Valve nominal bore
• Valve working pressure
• Existing gate part number
• Existing seat part numbers
• Gate overall length
• Gate width
• Gate thickness
• Flow-bore diameter
• Stem-connection dimensions
• Seat outside diameter
• Seat inside diameter
• Valve material class
• Temperature class
• Service fluid
• H₂S and CO₂ conditions
• Solids or sand content
• Required gate material
• Required surface coating
• Gate only or matched trim kit
• Required quantity
• Existing drawing or sample
• Inspection requirements
• Documentation requirements
• Destination country
• Required delivery schedule

Request a Technical Quotation

Goldenman supplies replacement slab gates, matched seats and complete trim kits for F- and FC-style API 6A wellhead gate valves.

The available range covers nominal bore sizes from 1-13/16 to 7-1/16 inches and parent-valve pressure classes from 2,000 to 20,000 psi.

Send the valve style, bore, pressure class, existing part number, gate dimensions, seat details and service conditions to:

Email: info@goldenman.com

Goldenman will provide the replacement gate, matched seats, seal materials, coating system, dimensional drawing, inspection records and commercial quotation.