Steel Valves

Mechanical devices made primarily from steel, used to control the flow, pressure, and direction of fluids (liquids, gases, slurries) within a pipeline system.

Types of Steel Valves

Ball Valves: Quarter-turn valve with a spherical disc to control flow. Excellent for tight shut-off.

Gate Valves: Multi-turn valve with a wedge-shaped gate that moves perpendicular to the flow. Good for on/off service, poor for throttling.

Globe Valves: Multi-turn valve with a globular body and a disc that moves perpendicular to the seat. Excellent for throttling.

Check Valves: Allow fluid flow in one direction only, preventing backflow. (Swing, Lift, Dual Plate, Tilting Disc).

Butterfly Valves: Quarter-turn valve with a disc that rotates within the flow path. Lightweight, compact, good for large pipe sizes.

Plug Valves: Quarter-turn valve with a cylindrical or tapered plug with a passage through it.

Diaphragm Valves: Use a flexible diaphragm to control flow. Good for corrosive fluids and slurries.

Needle Valves: Small, precision valves for fine flow control.

Applications in Various Industries:

Oil & Gas: Pipelines, refineries, offshore platforms.

Chemical & Petrochemical: Process control, hazardous fluid handling.

Power Generation: Steam, water, fuel lines.

Water & Wastewater Treatment: Pumping stations, distribution networks.

HVAC: Heating and cooling systems.

Mining: Slurry lines.

Technology: 

Actuators (manual, pneumatic, electric, hydraulic), smart valve technology (positioners, diagnostics, remote control), fugitive emissions control (low emission packing), severe service designs, fire-safe designs, cryogenic capabilities, corrosion-resistant coatings, specific industry standards (API, ASME, ISO).

Material Selection Considerations:

Body:

• Carbon Steel (e.g., A216 WCB, A105): For general-purpose applications, non-corrosive fluids, moderate temperatures.
• Stainless Steel (e.g., A351 CF8M (316 SS), CF8 (304 SS)): Excellent corrosion resistance, good for moderate to high temperatures, food/pharma.
• Alloy Steel (e.g., A217 WC6, WC9): For high-temperature, high-pressure applications (e.g., power plants).
• Duplex/Super Duplex Stainless Steel: For aggressive corrosive environments, higher strength.

• Trim (Disc, Stem, Seat): Often matching the body material or harder/more corrosion-resistant alloys (e.g., Stellite overlay for seat surfaces, hardened stainless steel).
• Seals/Gaskets/Packing: PTFE, Graphite, various elastomers (NBR, EPDM, Viton) depending on fluid compatibility, temperature, and pressure.
• Bolting: High-strength alloy steel (e.g., ASTM A193 B7 for studs, A194 2H for nuts).
• Actuator Materials: Cast iron, aluminum, steel.