Types of forged steel valves: a complete guide
Gate, globe, check, ball, plug, bellows seal, cryogenic and more—broken down by working principle, pressure class, end connection, and material. The reference engineers, distributors and procurement teams use to specify the right forged steel valve.
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What is a forged steel valve?
A forged steel valve is a flow control device manufactured by compressing heated steel under high pressure into a die, producing a denser, stronger valve body than cast valves. Compared to cast valves, forged steel valves offer higher tensile strength, better impact resistance, and zero porosity—making them the standard choice for high-pressure, high-temperature, and small-bore service in critical industries including oil & gas, petrochemical, power generation, and LNG.
Forged steel valves are typically manufactured to ASTM A105 (carbon steel), ASTM A182 F304/F316 (stainless steel), or F11/F22/F91 (alloy steel) specifications, in nominal sizes from 1/4" to 2", and pressure classes from 150 to 2500 LB. The forging process is governed by API 602, ASME B16.34, BS 5352, and MSS SP-84 standards.
About this guide: Written by the engineering team at CLDG—an innovative forged steel valve manufacturer specialized in small-diameter (1/2"–2") forged valves with 1,300+ specifications, 200+ skilled employees, and customers across 40+ countries.
Main types of forged steel valves
The forged steel valve family is broad, but most industrial applications rely on these eleven core types. Each subsection below covers the working principle, key features, and typical use cases—plus links to the CLDG product line where available.
1Forged steel gate valve
A forged steel gate valve uses a flat or wedge-shaped gate that lowers across the flow path to provide tight, bidirectional shut-off. When fully open, the gate retracts entirely from the bore, giving near-zero pressure drop. Gate valves are designed for on/off isolation only—not throttling—and are the most widely specified type of forged steel valve in oil & gas pipelines, refining, and power plants.
CLDG manufactures forged steel gate valves in pressure classes 150 LB to 2500 LB, with API 602 compliance, ASME B16.34 design, and end connections including socket weld (SW), butt weld (BW), threaded (NPT), and flanged (RF/RTJ). Bodies are forged from A105 carbon steel, F316 stainless steel, F22 alloy steel, or duplex F51/F55 on request.
Explore CLDG forged steel gate valves2Forged steel globe valve
A forged steel globe valve uses a disc that moves perpendicular to the seat, allowing precise flow regulation and tight shut-off. Unlike gate valves, globe valves are designed for throttling and frequent operation, with leak-tight performance up to vacuum service and pressure ratings up to 2500 LB.
Three common body patterns are used: Z-pattern (standard), Y-pattern (lower pressure drop, high-pressure steam), and angle pattern (45°/90°). CLDG forged globe valves are produced to API 602 with hardened seat surfaces, integral backseats, and renewable trims for long service life in steam, hydrocarbon, and chemical service.
Explore CLDG forged steel globe valves3Forged steel check valve
A forged steel check valve prevents backflow automatically using fluid pressure, with no external operator. Forged check valves come in three main styles, each with different flow characteristics:
Forged steel swing check valve
A hinged disc swings open with forward flow and closes by gravity or backpressure. Best suited for horizontal piping with steady flow; not recommended for pulsating or low-velocity service due to disc slamming risk.
Forged steel lift check valve
A guided disc lifts vertically off the seat. Tighter shut-off than swing check; suited to higher pressures and smaller bore sizes (1/2"–2").
Forged steel piston check valve
A cylindrical piston (often spring-assisted) provides fast, non-slam closure. CLDG's piston check valves are widely specified for pulsating flow, high-pressure steam, and reciprocating compressor discharge service.
CLDG produces forged piston, ball, and swing check valves in classes 150 LB to 2500 LB, all API 602 / ASME B16.34 compliant, with materials matched to the working media.
Explore CLDG piston, ball & swing check valves4Forged steel ball valve
A forged steel ball valve uses a perforated sphere (the ball) rotated 90° to open or close the flow. Quarter-turn operation makes ball valves the fastest-acting isolation valve type—ideal for emergency shut-off and frequent cycling. Forged ball valves are available in floating ball and trunnion-mounted designs (covered separately below) and in full-port or reduced-port configurations.
Trim materials commonly include PTFE, RPTFE, PEEK, and metal seats for fire-safe and high-temperature service. The B62 forged steel valve standard governs bronze ball valves; for steel, ASME B16.34 and API 6D apply.
5Forged steel floating ball valve
In a forged steel floating ball valve, the ball is held in place only by two seats and "floats" slightly when pressure is applied. Line pressure pushes the ball against the downstream seat, creating a tight seal—the simplest and most cost-effective ball valve design.
Floating ball valves are best for small-bore (1/2" to 2") and low-to-medium pressure service (typically up to Class 1500). CLDG's forged floating ball valves are quarter-turn, leak-tight to Class 2500 in compact designs, and used extensively in instrumentation, hydraulic, and process sampling lines.
Explore CLDG floating ball valves6Forged steel trunnion mounted ball valve
A forged steel trunnion-mounted ball valve fixes the ball in place with upper and lower trunnions (pivots), with spring-loaded seats pushed against the ball. This eliminates the side-load on seats found in floating designs, making trunnion valves the right choice for larger bore, higher pressure (Class 1500–2500), and high-cycle pipeline service—especially in oil & gas transmission.
7Forged steel plug valve
A forged steel plug valve uses a tapered or cylindrical plug rotated to open or close the flow. Plug valves are simpler than ball valves and excel in slurry, abrasive media, and gas distribution service, where solids would damage a ball valve seat. Lubricated, non-lubricated, and sleeved plug designs are common.
CLDG can produce custom forged plug valves to your specifications—including pressure class, end connection, material grade, and trim configuration—backed by in-house forging, machining, and 17-point quality testing.
Need forged steel plug valves for your project? Contact CLDG for a custom quote
8Forged steel butterfly valve
A forged steel butterfly valve uses a disc rotated through 90° on a shaft along the pipeline axis. Compact, lightweight, and lower cost per inch than gate or ball valves, butterfly valves dominate large-bore (≥3"), low-to-medium pressure isolation. In small-bore applications below 2", forged gate or ball valves typically outperform butterfly designs.
9Forged steel bellows seal valve
A forged steel bellows seal valve replaces conventional packing with a metal bellows welded to the stem and bonnet, creating a hermetically sealed barrier with zero stem leakage. First commercialized in 1954, bellows seal valves are mandatory for toxic, hazardous, or fugitive-emission-regulated service—chlorine, hydrogen, ammonia, heat transfer fluids, and high-purity steam.
Bellows seal designs are available in both gate and globe valve forms, with multi-ply bellows in 316L SS, 321 SS, or Inconel.
10Cryogenic forged steel valve
A cryogenic forged steel valve is engineered for service down to −196°C (LNG, liquid nitrogen, liquid oxygen). Key design features include extended bonnets (to keep the packing warm), austenitic stainless steel bodies (F304L/F316L) to retain ductility at low temperature, and low-temperature tested seat materials (PCTFE, PEEK). All cryogenic forged valves are tested per BS 6364 / MSS SP-134.
11Integral flanged end forged valve
An integral flanged end forged valve has the flange forged as part of the body—not welded on—giving stronger pressure retention and eliminating one potential leak path. CLDG's integral flanged end valves use OS&Y (outside screw and yoke) design, are available in pressure classes 150 LB to 2500 LB, and use corrosion-resistant materials selected for the application.
Explore CLDG integral flanged end valves+Bonus: pressure sealing bonnet forged valve
For pressures above Class 900, the bolted bonnet design becomes impractical. A pressure sealing bonnet forged valve uses the line pressure itself to push a sealing ring tighter as pressure rises—the higher the pressure, the better the seal. CLDG's pressure sealing bonnet valves are designed for high-pressure steam, power generation, and supercritical applications in classes up to 2500 LB.
Explore CLDG pressure sealing bonnet valvesForged vs cast steel valves: key differences
Choosing between forged and cast steel valves is one of the first decisions in valve specification. The two manufacturing methods produce fundamentally different metallurgy.
| Property | Forged steel valve | Cast steel valve |
|---|---|---|
| Manufacturing | Steel billet compressed in a die | Molten steel poured into a mold |
| Grain structure | Dense, directional, uniform | Random, often porous |
| Tensile strength | Higher (~25–30%) | Lower |
| Porosity defects | None | Possible voids and shrinkage |
| Typical size range | 1/4" to 2" (small bore) | 2" and larger |
| Cost per unit | Higher in small sizes | Lower in large sizes |
| Pressure rating | Up to Class 2500+ | Up to Class 2500 |
| Best application | High pressure, small bore, critical service | Large bore, lower pressure |
In short: forged steel valves dominate small-bore (1/2"–2") high-pressure service, while cast steel valves are more economical above 2". For demanding applications—oil & gas wellheads, refinery process lines, power plant steam loops—forged is almost always the right answer.
Forged steel valve pressure classes: from 150 to 2500
Forged steel valves are rated by ASME pressure class, which defines the maximum allowable working pressure at a given temperature per ASME B16.34. CLDG manufactures forged valves across the full class range:
For high-pressure forged steel valves (Class 1500 and above), pressure-temperature derating is critical—every CLDG valve ships with a class-rated P/T chart and material certificate.
Forged steel valve end connections: SW, BW, NPT, RF, RTJ
The end connection determines how the forged steel valve mates to the pipeline. CLDG supplies all five major end types:
Socket weld
The pipe slides into a recessed socket and is fillet-welded externally. Forged steel valve SW ends are standard for small-bore (1/2"–2") high-pressure service per ASME B16.11. Common in steam, hydrocarbon, and chemical lines.
Butt weld
Valve and pipe ends are beveled and welded together full penetration. Forged steel valve BW ends provide the strongest, most leak-resistant connection per ASME B16.25—preferred for high-temperature, high-cycle service.
NPT threaded
Forged steel valve NPT ends use ASME B1.20.1 tapered threads. Quick to install and inspect; common for instrument lines, utility services, and Class 800 and below. Not for high-vibration service.
Raised face flanged
Forged steel valve RF ends use a raised gasket face per ASME B16.5. The most common flanged connection for general industrial service in classes 150 to 2500. Easy in-line inspection and removal.
Ring type joint
Forged steel valve RTJ ends use a metal ring gasket in a machined groove for leak-tight metal-to-metal sealing. Standard above Class 600 in oil & gas wellheads—high pressure, high temperature, sour gas (H₂S).
Forged steel valve materials: carbon, stainless & alloy
Material selection drives valve performance. CLDG forges valve bodies from a wide range of steels, matched to working temperature, pressure, and media:
| Material family | ASTM grades | Service range | Typical use |
|---|---|---|---|
| Forged carbon steel | A105, LF2 | −29°C to +425°C | General oil & gas, water, mild steam |
| Forged stainless steel | F304, F304L, F316, F316L | −196°C to +540°C | Corrosive media, food, pharma |
| Forged alloy steel | F11, F22, F91, F92 | Up to +650°C | High-temperature steam, refinery |
| Duplex / super duplex | F51, F53, F55 | Up to +260°C | Marine, offshore, chloride service |
| Low-temp carbon steel | LF2, LF3 | Down to −46°C | Cold climate, low-temp gas |
| Nickel alloys | Monel 400, Inconel 625, Hastelloy C-276 | Severe corrosion | Chemical, hydrofluoric acid |
CLDG's in-house laboratory verifies every heat with spectrometers, metallographic testers, and impact and tensile machines, ensuring full traceability from raw billet to finished valve.
Forged steel valve standards: API 602, API 6D & ASME B16.34
Compliance with international standards is non-negotiable in forged valve specification. CLDG forged valves carry certifications across ISO 9001, API 602, API 6D, ASME B16.34, ANSI, and DIN—meeting the full set of requirements for global EPC projects. The most relevant standards at a glance:
| Standard | Scope | Applies to |
|---|---|---|
| API 602 | Compact forged gate, globe & check valves, NPS ≤4, Class ≤1500 | Refinery, petrochemical, small-bore power |
| API 6D | Pipeline ball, gate, plug & check valves with anti-static & sealant injection | Upstream & midstream oil & gas |
| ASME B16.34 | Pressure-temperature ratings, wall thickness, shell integrity | All forged steel valves (foundational) |
| BS 5352 | UK compact forged valve standard | EU/UK projects |
| MSS SP-84 | Threaded & socket weld forged valves | Small-bore SW/NPT valves |
| API 598 / 624 | Valve inspection, testing & fugitive emission | QA & environmental compliance |
CLDG produces API 602 forged steel gate valves, globe valves, and check valves, plus API 6D forged steel ball valves across the full Class 150–2500 range, with material certificates and test reports issued per shipment.
How to choose the right type of forged steel valve
Specifying a forged steel valve comes down to five questions. Walk through them in order:
Still unsure? Talk to a CLDG forged valve engineer
Forged steel valves in critical industries
Different industries push forged steel valves to different limits. Here is how the eleven types map to real-world service:
Oil & gas
High pressure forged steel valves are deployed across upstream wellheads, midstream pipelines, and downstream refining. Single-piece forged bodies eliminate weld failure risk; H₂S and CO₂ corrosion is handled with NACE MR0175-compliant materials. Typical valve mix: forged gate valves, trunnion ball valves, RTJ check valves.
Petrochemical & chemical processing
Demands corrosion-resistant alloys (F316L, duplex F51, Hastelloy) and zero-leak designs. Forged bellows seal valves are mandatory for toxic media. CLDG's micron-tolerance machining and 17-checkpoint quality program meet API and PED Cat. III requirements.
Power generation (fossil & nuclear)
High-temperature steam loops use forged F22 globe valves, pressure-sealing bonnet gate valves, and Y-pattern globe valves. Forged construction with hardened seats resists wear over 30+ year service lives.
LNG & cryogenic service
Cryogenic forged valves with extended bonnets and F316L bodies handle LNG at −162°C without seat embrittlement. Tested per BS 6364. Extended-stem design keeps packing warm in deep-cold service.
Wastewater & water treatment
Lower pressure but high-cycle service. Forged steel ball valves and floating ball valves dominate isolation duty. Bronze and 316 stainless trims handle aggressive chemistries common in municipal and industrial water processing.
Why source forged steel valves from CLDG
As an innovative forged steel valve manufacturer focusing on small-diameter (1/2"–2") forged valves, CLDG has supplied brands, wholesalers, and distributors across 40+ countries with comprehensive forged valve solutions.
Built for critical systems, at scale.
CLDG's full-process integration—forging, machining, welding, testing, packing—keeps your supply chain lean and predictable. Whether you need a single forged steel gate valve for a refinery turnaround or a 5,000-piece OEM run, CLDG delivers.
1-minute auto quote
Send specs, get a quote in a minute through CLDG's digital sourcing system—no email chains, no waiting.
99% first-pass test rate
Every valve verified by in-house spectrometer, metallographic, and tensile labs. Material certificate per shipment.
Ex-stock + 4-week custom
Standard models ship from 8 warehouses immediately. Custom forged valves built and delivered in 4–6 weeks.
40+ countries served
Trusted by brands, wholesalers, and distributors worldwide—from North American refineries to Middle East EPC projects.
Need a quote? Let's forge ahead.
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Contact CLDG →Frequently asked questions
What are the main types of forged steel valves?
The main types of forged steel valves are gate, globe, check (swing/lift/piston), ball, floating ball, trunnion-mounted ball, plug, butterfly, bellows seal, cryogenic, and integral flanged end valves. Each is designed for a specific function—isolation, throttling, backflow prevention, or hermetic sealing—across pressure classes 150 LB to 2500 LB.
What is the difference between forged and cast steel valves?
Forged steel valves are made by compressing heated steel under high pressure into a die, producing a denser, stronger, void-free body. Cast steel valves are poured from molten steel into a mold and may contain porosity. Forged valves dominate small-bore (1/2"–2") high-pressure service; cast valves are more economical above 2".
What pressure classes are forged steel valves available in?
Forged steel valves are available in ASME pressure classes 150, 300, 600, 800, 1500, and 2500 LB. Class 800 is unique to forged steel valves and not recognized for cast valves. Higher classes (1500/2500) typically use pressure-sealing bonnet designs.
What is API 602 in forged steel valves?
API 602 is the American Petroleum Institute standard for compact forged steel gate, globe, and check valves used in refinery and petrochemical service, in sizes up to NPS 4 and classes up to 1500. It defines body wall thickness, trim materials, testing, and design requirements.
Are forged steel valves better than cast steel valves?
For small-bore (1/2"–2") high-pressure or critical service, yes—forged steel valves offer roughly 25–30% higher tensile strength, no porosity, and longer service life than equivalent cast valves. Above 2" or in lower-pressure service, cast steel valves are usually more cost-effective.
Need Help Selecting the Right Forged Steel Valve?
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- Flow Coefficient (Cv Value)
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