Ball Valves
Quarter-turn valves use a bored spherical closure element to provide rapid isolation and a relatively direct flow path when fully open.
VALV / VALVE — FLOW CONTROL REFERENCE
Industrial Valves.
Industrial valves control the movement of liquids, gases, steam, slurries, hydraulic fluid, compressed air, and other process media through piping and equipment. Depending on the design, a valve can isolate flow, throttle flow, redirect media, prevent reverse flow, regulate pressure, protect equipment, or automate a process sequence. Selection depends on valve function, line size, pressure, temperature, flow characteristics, media compatibility, shutoff requirements, connection type, materials, seat and seal design, actuation, control signals, installation orientation, standards, maintenance, and expected service life.
OPERATING PRINCIPLE
Valves create controlled restrictions and flow paths.
A valve changes the open area or direction available to process media. Depending on the design, a ball, disc, gate, plug, diaphragm, globe, piston, needle, poppet, or other closure element moves relative to a seat or flow passage.
Some valves are intended primarily for full open or full closed service, while others are designed for throttling, modulation, pressure control, or rapid automated cycling.
Valve performance must be considered as part of the complete system with industrial pumps, piping, instruments, actuators, control systems, filters, process equipment, and the fluid itself.
BASIC VALVE IDENTIFICATION
Size
Nominal line or port size associated with the piping connection.
Pressure
Maximum or classified pressure capability at specified conditions.
Media
Liquid, gas, steam, slurry, chemical, or other process fluid.
Seat
Sealing interface contacted by the closure element.
Ends
Threaded, flanged, welded, clamped, wafer, lug, or other connection.
Operator
Handle, gearbox, actuator, solenoid, or automated control mechanism.
SECTION / 01
Common Industrial Valve Types
Valve designs differ by closure geometry, operating motion, pressure drop, shutoff behavior, throttling capability, media handling, actuation, and maintenance requirements.
Butterfly Valves
A rotating disc positioned within the flow path provides compact quarter-turn isolation or control for many larger-diameter piping systems.
Gate Valves
A gate moves into or out of the flow path and is commonly used where low restriction in the fully open condition is important.
Globe Valves
A movable plug or disc approaches a stationary seat through a shaped body passage, making many globe configurations suitable for throttling service.
Check Valves
Self-acting valves permit flow in the intended direction while restricting or stopping reverse flow.
Diaphragm Valves
Flexible diaphragms isolate the operating mechanism from the process media and control flow by contacting a seat or weir.
Plug Valves
Cylindrical or tapered plugs with internal passages rotate within the valve body to isolate or redirect flow.
Needle Valves
Fine-threaded stems and tapered closure elements provide controlled adjustment of relatively small flow passages.
Solenoid Valves
Electromagnetic coils move plungers or pilot mechanisms so fluid flow can be switched electrically within automated systems.
FUNCTION / CONTROL
Choose the valve by what the process needs it to do.
Valve type should follow the required control function. A valve optimized for isolation may perform poorly as a throttling device, and a precision control valve may be unnecessary for simple shutoff service.
PRIMARY VALVE FUNCTIONS
Isolation
Opens or closes a process line so equipment,
piping, or sections of the system can be separated.
Throttling
Creates a controlled restriction to adjust flow
or process conditions across a useful operating range.
Direction
Routes flow between multiple ports, branches,
circuits, actuators, or process destinations.
Backflow
Automatically blocks reverse movement of fluid
when downstream pressure exceeds upstream pressure.
Pressure
Regulating, relief, reducing, or control valves
influence pressure within defined sections of a system.
Automation
Pneumatic, electric, hydraulic, or solenoid
actuation allows remote and programmable operation.
Safety
Certain valve systems provide emergency isolation,
overpressure protection, fail-safe positioning,
or controlled shutdown functions.
SECTION / 02
Pressure, Flow & Sealing
Valve performance depends on pressure capability, flow behavior, seat design, shutoff requirements, materials, and operating conditions.
Pressure Rating
Body, bonnet, stem, closure element, seats, end connections, bolting, and seals must safely withstand the intended pressure and temperature.
Flow Capacity
Internal passage geometry determines restriction, velocity, pressure drop, and available flow through the valve.
Shutoff
Seat design, material, closure force, pressure, temperature, wear, and contamination influence leakage when the valve is closed.
Cycle Life
Frequent operation increases demands on seats, stems, packing, actuators, bearings, seals, and closure surfaces.
SECTION / 03
Industrial Valve Specifications
Replacement valves should be compared using the entire pressure-boundary, flow, sealing, material, connection, and actuation specification.
Specification
What to Verify
Why It Matters
Valve Type
Ball, butterfly, gate, globe, check, diaphragm,
plug, needle, solenoid, or other configuration.
Determines operating motion, function,
restriction, and service characteristics.
Size
Nominal pipe size, bore, port diameter,
and internal flow passage.
Determines piping fit and affects pressure drop
and flow capacity.
Pressure
Pressure class or maximum allowable pressure
at the expected temperature.
Valve pressure boundary must tolerate
the system operating and upset conditions.
Temperature
Normal, minimum, and maximum media and ambient temperatures.
Temperature affects body, seat, packing,
seal, actuator, and pressure capability.
Materials
Body, trim, ball, disc, gate, stem,
diaphragm, seat, packing, and seals.
Wetted components must tolerate corrosion,
erosion, wear, temperature, and process chemistry.
Connections
Thread, flange, wafer, lug, weld,
sanitary clamp, compression, or other ends.
Determines installation compatibility,
pressure boundary, and piping geometry.
Shutoff
Required leakage performance, seat configuration,
directionality, and differential pressure.
Determines whether the valve can isolate the process adequately.
Actuation
Manual handle, gearbox, pneumatic actuator,
hydraulic actuator, electric actuator, or solenoid.
Determines operating torque, speed,
automation, controls, and fail position.
Standards
Applicable dimensional, pressure, testing,
material, industry, and project requirements.
Controls compatibility with piping systems,
specifications, inspection, and regulatory requirements.
SECTION / 04
Industrial Valve Selection
Define the process function and media first, then evaluate pressure, temperature, materials, valve style, connections, actuation, and maintenance.
01
Define the Function
Determine whether the valve must isolate,
throttle, divert, mix, prevent reverse flow,
regulate pressure, relieve pressure, or switch
an automated process.
02
Define the Media
Identify fluid composition, state, viscosity,
solids, corrosiveness, toxicity, abrasiveness,
cleanliness, temperature, and compatibility
with all wetted materials.
03
Establish Pressure & Flow
Determine maximum and normal pressure,
differential pressure, temperature, required
flow, acceptable pressure drop, and shutoff conditions.
04
Choose the Valve Type
Compare ball, butterfly, gate, globe, check,
diaphragm, plug, needle, and other designs
according to process function and operating conditions.
05
Match Materials & Ends
Verify body, trim, seat, seal, diaphragm,
packing, flange, thread, weld, wafer, lug,
or sanitary connection requirements.
06
Verify Actuation & Controls
Confirm operating torque, manual access,
actuator type, air supply, electrical supply,
control signal, fail position, limit switches,
position feedback, cycle rate, and maintenance access.
Compatibility / Note 12
Equal pipe size and pressure class do not guarantee interchangeability.
Valves with the same nominal size and pressure rating can differ in face-to-face length, flange pattern, bore size, flow coefficient, seat material, body material, pressure-temperature limits, shutoff capability, directionality, stem geometry, actuation torque, actuator mounting, control signal, fail position, and required installation orientation. Verify the complete valve and actuator specification before substitution. See the Pump & Valve Selection Guide and Component Compatibility Guide before approving a replacement.
SECTION / 05
Industrial Valve Resources
Additional industrial references for ball valves, butterfly valves, check valves, diaphragm valves, hydraulic valves, and related fluid-control systems.
Ball Valves
Industry resource covering ball valve designs, materials, configurations, applications, actuation, and supplier research.
Research Ball ValvesButterfly Valves
Supporting resource covering butterfly valve configurations, materials, actuation, applications, and industrial suppliers.
Research Butterfly ValvesCheck Valves
Focused reference for valves used to permit intended flow while automatically limiting reverse movement through piping systems.
Research Check ValvesDiaphragm Valves
Industrial resource covering diaphragm-based fluid-control valves, materials, applications, operating methods, and supplier capabilities.
Research Diaphragm ValvesHydraulic Valves
Industry reference covering directional, pressure, flow-control, and other valves used throughout hydraulic fluid-power systems.
Research Hydraulic ValvesPump & Valve Selection
OpenType guide for evaluating process media, pressure, flow, materials, valve function, connections, actuation, and compatibility.
Selection Guide
Reference note:
External resources are provided for additional research
and do not establish product compatibility,
interchangeability, certification, approval, or endorsement.
Verify valve type, size, pressure rating, temperature,
flow capacity, media compatibility, body and trim materials,
seats, seals, end connections, actuation, control signals,
installation orientation, applicable standards, and
maintenance requirements before specifying or replacing
an industrial valve.
RELATED / FLUID
Continue the Fluid Component Reference
Continue into industrial pumps, electrically operated solenoid valves, hydraulic systems, and the broader pump-and-valve selection process.