Types of Industrial Valves: Complete Guide with Applications and Selection Criteria

Industrial valves are mechanical devices that control, regulate, or isolate the flow of fluids (liquids, gases, slurries) in piping systems. With over 13 distinct types in common use, selecting the right valve for a specific application requires understanding the design principles, operating characteristics, material requirements, and applicable standards for each type. This guide covers all major industrial valve types used across oil & gas, power generation, chemical processing, water treatment, pharmaceutical, and general industrial applications.

1. Ball Valves

Ball valves use a spherical ball with a bore as the closing element. They provide quarter-turn (90°) operation, excellent bi-directional sealing, and are available in floating and trunnion-mounted designs. Floating ball valves suit small-to-medium sizes and low-to-medium pressures; trunnion ball valves are specified for large diameters (above 4") and high-pressure Class 600–2500 service.

Key applications: Oil and gas pipelines (API 6D), refineries, cryogenic service (LNG), chemical processing, actuated on-off and control service. Standards: API 6D, API 608, BS 5351, ASME B16.34.

2. Gate Valves

Gate valves use a flat or wedge-shaped gate that slides perpendicular to flow. They provide full-bore flow with minimal pressure drop in the open position. Multi-turn operation (via handwheel) makes them suitable for infrequently operated isolation service. Rising-stem (OS&Y) designs allow visual position indication; non-rising stem designs are used for buried or space-restricted installations.

Key applications: Water and steam isolation, oil pipelines, power plant main steam lines, buried underground service. Standards: API 600, API 603, ASME B16.34, BS 1414.

3. Globe Valves

Globe valves use a plug-type disc moving perpendicularly to the flow seat. Their design allows for excellent throttling and flow regulation, making them the preferred choice for flow control applications. T-pattern (standard), Y-pattern (lower resistance), and angle-type designs are available. Globe valves have higher pressure drop than gate or ball valves in the fully open position but provide superior throttling performance.

Key applications: Steam regulation, boiler feedwater control, chemical dosing, cooling water regulation, instrumentation isolation. Standards: ASME B16.34, API 623, BS EN 13709.

4. Butterfly Valves

Butterfly valves use a disc mounted on a rotating shaft as the closing element. Three main designs are used industrially: concentric (resilient-seated) for water and HVAC up to Class 150; double-eccentric (high-performance) for oil, gas, and steam up to Class 600; and triple-offset (metal-seated) for critical high-temperature, high-pressure, and fire-safe service up to Class 2500.

Key applications: Large-diameter water and wastewater systems, HVAC, oil and gas, power generation, marine, desalination. Standards: API 609, EN 593, ASME B16.34.

5. Check Valves

Check valves prevent backflow by allowing fluid to flow in only one direction. Major types include swing check (hinged disc, used in horizontal lines), lift check (piston or disc, requires horizontal or vertical installation), dual-plate wafer check (compact, low pressure drop, spring-loaded), and tilting-disc check (reduced slam, high-flow efficiency).

Key applications: Pump discharge lines, compressor outlets, boiler feedwater, pipeline backflow prevention. Standards: API 594, API 6D, ASME B16.34.

6. Safety and Pressure Relief Valves

Safety valves automatically open to relieve excess pressure when the system pressure exceeds a set point, protecting vessels, pipelines, and equipment from overpressure. Spring-loaded safety valves (ASME Section I for boilers, Section VIII for vessels) and pilot-operated relief valves (for large flows and tight set pressure accuracy) are the main types.

Key applications: Boilers, pressure vessels, reactors, pipelines, compressed gas systems. Standards: API 520, API 526, ASME BPVC Section I and VIII, EN ISO 4126.

7. Globe Control Valves

Control valves modulate flow in response to a signal from a controller. They use a range of plug and seat geometries (single-seat, double-seat, cage-guided) combined with pneumatic, electric, or hydraulic actuators and positioners to maintain a process variable (flow, pressure, temperature, level) at a desired set point.

Key applications: Process control in refineries, chemical plants, power stations, food and beverage, and water treatment. Standards: IEC 60534, ISA 75, ANSI/FCI 70-2.

8. Plug Valves

Plug valves use a cylindrical or tapered plug as the closing element. Lubricated plug valves are used in oil and gas for slurry, viscous fluids, and on-off isolation where a cost-effective solution is needed. Non-lubricated (lined) plug valves with PTFE sleeving are used for chemical and corrosive service.

Key applications: Slurry service, wastewater, on-off isolation in refineries, natural gas distribution. Standards: API 599, API 6D.

9. Needle Valves

Needle valves provide fine, precise flow adjustment using a long, tapered needle-shaped plunger. They are used predominantly in instrumentation, sampling, and high-pressure gauge isolation applications. Available in stainless steel, carbon steel, and Monel/Hastelloy for corrosive media.

Key applications: Instrument impulse lines, gauge isolation, sampling systems, hydraulic control circuits, laboratory systems. Standards: ASME B31.3, manufacturer standards.

10. Diaphragm Valves

Diaphragm valves use a flexible diaphragm as the sealing element, completely separating the valve body from the fluid. Weir-type (saddle body) and straight-through designs are available. They are the preferred valve type for hygienic, pharmaceutical, and corrosive applications because there are no crevices, pockets, or stem packing exposed to the process fluid.

Key applications: Pharmaceutical (USP Class VI), biotech, food and beverage, water treatment, chemical processing with aggressive media. Standards: ASME BPE, ISO 15741, DIN 11850.

11. Pinch Valves

Pinch valves work by pinching a flexible rubber sleeve to close off the flow path. They have an unobstructed, full-bore flow path with no internal parts exposed to the media. This makes them ideal for abrasive, corrosive, and particle-laden slurries where conventional metal valves would wear rapidly.

Key applications: Cement and mining slurries, food processing, paper and pulp, pharmaceutical powder handling, wastewater. Standards: Manufacturer standards.

12. Strainers

Strainers are not strictly valves, but are essential inline flow control devices that remove solid particles from process fluids to protect downstream equipment. Y-type strainers are the most common for line sizes up to 8"; basket strainers provide higher dirt-holding capacity for larger lines; duplex strainers allow one basket to be cleaned while the other remains in service (zero-downtime maintenance).

Key applications: Upstream of control valves, pumps, meters, heat exchangers, and any equipment that requires protection from particulate contamination.

13. Actuators and Automation

Actuators convert energy (pneumatic, electric, or hydraulic) into mechanical motion to operate valves automatically. Pneumatic actuators (scotch-yoke and rack-and-pinion types) are preferred in hazardous areas; electric actuators suit remote or difficult-access locations; hydraulic actuators provide the highest torque for large, high-pressure valves. Actuated valve assemblies include the valve, actuator, solenoid valve, positioner, limit switches, and junction box.