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Valve Comparison Guide

Ball Valve vs Gate Valve for High-Pressure Service - API 6D vs API 600

Ball valve vs gate valve for high-pressure oil & gas, refinery, and steam service. Class 600 to 2500 comparison: trunnion vs wedge gate, cost, weight, piggability. API 6D vs API 600.

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For Class 600–2500 high-pressure service, the choice comes down to: (1) Temperature: if the fluid exceeds 230°C (hot oil, steam, high-temp gas), metal-seated gate valves are required unless you specify metal-seated ball valves; (2) Operation speed: if rapid closing is required (ESD, blowout prevention, emergency isolation), trunnion ball valves are mandatory - gate valves cannot close fast enough; (3) Pipeline pigging: both full-bore ball and gate valves allow pigging; (4) Cost: at DN300+ Class 600, gate valves are often 30–50% less expensive than trunnion ball valves; (5) Steam duty specifically: gate valves with WC6/WC9/P91 and Stellite seats are the only practical choice above 230°C without special high-temperature ball valve procurement..

Overview

Ball Valve (Trunnion)

The trunnion-mounted ball valve is the preferred high-pressure isolation valve for oil & gas pipelines, LNG terminals, and refineries. The ball is mechanically anchored by trunnion bearings, dramatically reducing operating torque at Class 600–2500 pressures, enabling reliable electric and pneumatic automation.

DN50–DN900, Class 600–2500, A216 WCB / LCC, API 6D, fire-safe API 6FA

Gate Valve

Gate valves are the traditional choice for high-pressure isolation in refineries, power plants, and chemical plants. The wedge gate design - particularly with Stellite-faced seats - handles steam, high-temperature hydrocarbons, and abrasive conditions that would destroy ball valve PTFE seats.

DN50–DN900, Class 600–2500, WC6/WC9/P91, API 600, Stellite trim

Ball Valve (Trunnion) or Gate Valve?

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Pros & Cons

Ball Valve (Trunnion)

Low operating torque - trunnion design allows full-bore automation at Class 2500

Full bore - piggable in full-bore configuration, no pressure drop

Quarter-turn - fast emergency isolation (ESD) capability

Fire-safe by design - API 6FA/API 607 certification straightforward

DBB and DIB configurations available for metering skid zero-leakage requirements

Higher cost than gate valves at equivalent pressure class and large bore

Not suitable for steam at elevated temperatures (PTFE seat limit ~230°C)

Limited to Class 2500 maximum for standard ball valves

Slurry and abrasive service will erode PTFE seats rapidly

Gate Valve

Proven technology for high-temperature steam (WC6 to 640°C, P91 to 650°C)

No PTFE seats - metal seat gate valves handle steam, abrasives, and extreme temps

Stellite hard-facing handles erosive and abrasive service that destroys ball seats

API 600 specification widely accepted by all owner-operators

Lower cost at large bore (DN300+) compared to equivalent trunnion ball valves

Multi-turn operation - slow opening/closing; not suitable for ESD duty

Much heavier than trunnion ball valves at equivalent bore

Cannot be used for throttling - gate erosion and wire drawing

Complex packing replacement in high-pressure service - emission control critical

Ball Valve (Trunnion) vs Gate Valve - Specification Comparison

Parameter	Ball Valve (Trunnion)	Gate Valve
Max Service Temperature	~230°C (PTFE seat); ~260°C (PEEK seat); ~454°C (metal seat)	640°C (WC6 Stellite), 650°C+ (P91)
Steam Service	Limited - metal-seated ball valves required above 230°C	Standard design for high-pressure steam
Pressure Class	Class 150–2500 (API 6D)	Class 150–2500 (API 600)
Operation	Quarter-turn - 90° rotation, fast ESD capability	Multi-turn - 20–100 turns; slow operation
Weight (DN300, Cl 600)	~150–250 kg (trunnion ball valve)	~300–500 kg (gate valve)
Fire-Safe Certification	Standard - API 6FA / ISO 10497	Metal seat inherently fire-safe; packing is concern
Piggability	Full-bore trunnion ball valve is piggable	Full-bore gate valve is piggable
Throttling	Not suitable (except V-port ball valve)	Not suitable (erosion of gate/seats)
Abrasive Service	Not suitable with PTFE seats; metal-seated required	Stellite hard-faced seats handle abrasion well
ESD Suitability	Excellent - quarter-turn, spring-return actuator	Poor - too slow for emergency shutdown
API Standard	API 6D, API 6A (wellhead)	API 600, API 6D (pipeline)
Cost (DN300, Cl 600)	Higher (trunnion complexity)	Lower at large bore

When to Use Each

Use Ball Valve (Trunnion) when:

Oil & gas transmission pipelines (Class 600–1500, API 6D)

LNG terminal isolation and distribution (cryogenic rated)

ESD (Emergency Shutdown) isolation requiring fast quarter-turn closure

Metering skids with DBB/DIB zero-leakage requirements

Offshore platform topside service at Class 600–1500

Use Gate Valve when:

High-temperature steam (above 230°C - beyond PTFE seat limit)

Boiler, turbine, and power plant steam service (WC6/WC9/P91)

Refinery process units where abrasive catalyst and slurry service occurs

Large-bore (DN300+) process piping where cost advantage is significant

ASME B31.1 power piping where gate valves are specified

Decision Guide

Frequently Asked Questions

At what pressure class should I switch from floating ball valve to trunnion?

The standard guideline is: Use floating ball valves for DN15–DN50 (½"–2") at any pressure class, and for DN50–DN100 (2"–4") up to Class 600. Use trunnion mounted ball valves for DN100 (4") and above at Class 150–2500, and for any size at Class 900+. The reason is seat load: in a floating ball valve, line pressure acts on the upstream ball face, pushing the ball against the downstream seat to create a seal. At Class 900+ or in large bores, this seat load becomes extremely high - PTFE seat deformation and high operating torque result. Trunnion bearings absorb the axial load, keeping seat contact pressure at controlled, design-optimised levels.

Can I use a ball valve instead of a gate valve on steam lines?

Yes, but with important caveats. Standard PTFE-seated ball valves are limited to approximately 180–230°C service temperature. Above this, PTFE cold-flows under seat contact pressure, causing leakage. For steam above 230°C, you need: (1) PEEK-seated ball valves (up to ~260°C); (2) metal-seated ball valves with SS316 or Stellite-coated seats (up to ~500°C); or (3) conventional gate valves (WC6/WC9/P91 with Stellite) which handle to 650°C. Metal-seated ball valves for high-temperature steam exist but are expensive and require careful specification. For most steam plant at Class 300–600 above 230°C, gate valves remain the more practical and cost-effective choice.

Which valve is required for pipeline pig launchers and receivers?

Pipeline pig launchers and receivers require full-bore valves that allow the pig to pass through without restriction. Both full-bore ball valves (trunnion mounted, Class 600–1500 for most transmission pipelines) and full-bore gate valves (slab gate or through-conduit gate valve to API 6D) are used. The industry trend, particularly for high-pressure transmission pipelines, favours full-bore trunnion ball valves on pig launchers because: (1) faster operation (quarter-turn) - reduces pig launching cycle time; (2) fire-safe (API 6FA) - mandatory for hydrocarbon pipelines; (3) DBB option available. However, slab gate valves remain common on older pipeline systems. Always confirm the valve bore equals or exceeds the pipeline ID before specifying.

Reviewed by Application Engineering, Vajra Industrial SolutionsDiscipline: Valve Application EngineeringLast reviewed: 20 June 2026