Alloy 20 Valve

Alloy20 Valve Manufacturer in Germany

Valvesonly Europe manufactures Alloy 20 valves for handling sulfuric acid and other corrosive media across process piping systems. As a manufacturer, we produce Alloy 20 valves in ball, butterfly, check, gate, globe, and plug configurations for chemical processing lines, acid transfer systems, and corrosive fluid handling applications.

What is an Alloy 20 Valve?

An Alloy 20 valve is a valve manufactured from Alloy 20 (UNS N08020), a nickel iron chromium alloy with molybdenum and copper additions, designed for handling sulfuric acid and other aggressive acidic media. The alloy composition provides resistance to pitting, crevice corrosion, and stress corrosion cracking in acid service, making it suited for valve bodies, trims, and wetted components in acid handling piping systems.

Types of Alloy 20 Valve:

Alloy 20 Ball Valve – Quarter turn valve for tight shut-off in corrosive applications.
Alloy 20 Butterfly Valve – Compact valve for isolation and flow control in large pipelines.
Alloy 20 Check Valve – Prevents reverse flow in corrosive process systems.
Alloy 20 Gate Valve – Full bore valve for isolation with minimal pressure drop.
Alloy 20 Globe Valve – Linear valve for accurate flow regulation.
Alloy 20 Plug Valve – Quarter turn valve for handling corrosive fluids and slurries.

Why Alloy 20 valve?

Resists sulfuric acid corrosion across a range of concentrations and temperatures, where carbon steel and standard stainless steel grades fall short
Copper content improves resistance to acid attack in sulfuric acid service
Molybdenum content supports resistance to pitting and crevice corrosion in chloride-containing environments
Maintains resistance to stress corrosion cracking over extended service life
Preferred material for valve bodies and trims in acid transfer, acid storage, and acid dosing systems

Technical Specifications:

Parameter	Specification Range
Material Standard	UNS N08020, ASTM B462 / B463 / B471
Nominal Size	DN15 to DN300 (½” to 12″)
Pressure Rating	PN10 to PN40, ANSI Class 150 to Class 300
End Connections	Flanged, Screwed (BSP/NPT), Butt Weld, Socket Weld
Operating Temperature	Up to 150°C (higher for special designs)
Seat Material	PTFE, Reinforced PTFE, RPTFE, Metal Seated
Operation Type	Manual (Handwheel/Lever), Gear Operated, Actuated
Testing Standards	Hydrostatic and seat testing as per EN 12266, API 598
Design Standards	EN, ASME, DIN, BS, API

Chemical Composition of Alloy 20 (UNS N08020):

Element	Composition (%)
Nickel	32.0 – 38.0
Iron	Balance
Chromium	19.0 – 21.0
Molybdenum	2.0 – 3.0
Copper	3.0 – 4.0
Manganese	2.0 max
Carbon	0.07 max

Selection Criteria for Alloy 20 Valve:

Acid concentration and operating temperature at the valve location
Presence of chlorides or other contaminants affecting corrosion resistance
Line size and required flow control (isolation vs. throttling)
Seat material compatibility with the process fluid
End connection type based on piping specification
Actuation requirement (manual, gear, or actuated operation)

Installation Points for Alloy 20 Valve:

Sulfuric acid storage and transfer lines
Acid dosing and metering systems
Effluent treatment and neutralization units
Pickling and acid regeneration circuits
Metal processing and surface treatment lines

Materials of Construction:

Our Alloy 20 valves are manufactured with Alloy 20 body, bonnet, ball, disc, plug, or wedge as applicable, with seat and seal materials in PTFE or reinforced PTFE for chemical compatibility with acid media, and stem material in Alloy 20 or equivalent corrosion resistant grades.

Alloy 20 Valve Manufacturing at ValvesOnly Europe

We manufacture Alloy 20 valve to specified pressure classes, connection types, and sizes, with material traceability and hydrostatic testing carried out on every batch supplied. Technical documentation, material test certificates, and dimensional drawings are provided to support project specification and procurement, backed by our expertise as an Alloy 20 Valve Manufacturer in Germany.