Valve Types

Normally Valves can be classified by:

The operation of the valve close member


The kind of closure member movement defines both the geometry and operative of the valve.

• Quarter-turn valve (part-turn valve): 
The closure member as well its shaft turn 0º-90º; from the fully-open position to the fully-closed position. 
They are quick opening/closure valves.
Types of valves: Butterfly valve, Ball valve, Spherical valve.Plug valve.

• Multi-turn valve (linear  valves): 
The closure member has a linear displacement generally by turning its threaded stem several times.
This operation is slow, but it gives accuracy and stability to position the closure member, which is necessary in some control valves.
Types of valves: Gate valve,  Fixed cone valve, Globe valve,Needle valve and Pinch valve.

The nature and physical conditions of the flow control

• Low/High temperatures.

• Low/High pressures.

• Cavitation risk.

• Corrosive or erosive properties of the flow.

• Viscosity: Gas, liquid, solid.

• Hygiene requirements (for the food or pharmacy industry...).

• Explosion and risk of inflammability (chemical, petrochemical industry).

The functionality of the valves

• Closure at over-speed flow. (i.e. immediate closure if downstream pipeline is broken by accident).

• Control: pressure / flow rate regulation.

• On/Off service.

• Back flow prevention (check valve).

• Overpressure protection.

Other forms of valve classification

• Admissible leakage level.

• Connection to the pipe.

• Number of ports: most of the valves have two port, named inlet and outlet port. But for same applications there are multi-port configured valves. They can be three-way and four-way valves.

• An unique direction of the flow or bidirectional flow.

• Angle between the inlet and outlet port of the valve.

◆More information about Motorized Gate Valve,please click Motorized Gate Valve.
◆More information about Motorized Ball Valve,please click Motorized Ball Valve.
◆More information about Electric Control Valve,please click Electric Control Valve.
◆More information about Motorizd Globe Valve.please click Motorized Globe Valve.