A valve can initiate, stop or regulate flows by means of a moving part that partially opens, closes or obstructs one or more orifices or conduits according to the actions indicated in the installation logic.
The different valves types are characterized by their type of drive, end connections, disk or wedge, seat, stem, bonnet, and body.
For a correct valve selection, nominal capacity, flow rate, pressure and operating and design temperature must always be taken into account.
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Valve classification

According to its physical characteristics

​→ Ways
→ Actuator
→ Seat
→ Body
→ Positions
→ End connections

According to the purpose, they must achieve in the installation

​​→ Steering control valves: interrupt, allow the fluid pass or bypass.
→ Pressure control valves: maintain a constant set pressure.
→ Flow control valves: close the flow pass in a defined time.
→ Isolation valves: block flow in one direction and pass it in another.
→ Check valves: open or close the flow pass which can be the action in both directions.

According to the drive type

→ Manuals
→ Motorized
→ Hydraulic
→ Pneumatics
→ Electronics​

VALVES TYPES EMPLOYED IN PNEUMATIC CONVEYING OF BULK MATERIALS

BUTTERFLY VALVE

​→ OPENING / CLOSING: by pivoting disk
→ PRESSURE FALL: very low due to its hermetic seal
→ CIRCULATION CONTROL: On / Off and throttling
→ OTHERS: there are no cavities where solids can accumulate
BNasiento

SEAT VALVE

→ OPENING / CLOSING: by seat or support
→ PRESSURE DROP: very low
→ CIRCULATION CONTROL: On / Off and throttling
→ OTHERS: flow regulation

BALL VALVE

​→ OPENING / CLOSING: spherical rotating
→ PRESSURE DROP: very low
→ CIRCULATION CONTROL: On / Off
→ OTHERS: very good tightness
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BNdiafragma

DIAPHRAGM VALVE

→ OPENING / CLOSURE: through an elastomer diaphragm
→ PRESSURE DROP: very low
→ CIRCULATION CONTROL: On-off
→ OTHERS: Useful as an isolation valve

NEEDLE VALVE

→ OPENING / CLOSING: a conical closing shaft blocks or open.
→ PRESSURE DROP: very low.
→ CIRCULATION CONTROL: a model to regulate the flow although it is a slow way to operate since several turns are necessary to modify the fluid pass.
→ OTHERS: allows a good seal thanks to its precision and stability
BNde aguja

ROTARY VALVES

→ OPENING / CLOSING: a rotor with cavities in a cylindrical shell which allows the flow through it.
→ PRESSURE DROP: Low
→ CIRCULATION CONTROL: feeders in pneumatic conveying systems or as volumetric feeders to maintain a uniform flow of material
→ OTHERS: Very useful to continuous loading or unloading with continuous flow and low-pressure drop, ensuring an excellent pneumatic seal.