Custom Search
Home | About Valvias | Login sponsor | Sponsor Info | Valvias Tv | Contact | Site Map |
Valvias The most visited portal for Valves & Actuators
  Open to all manufacturers and distributors
[+info]  
Home contact
General
Basic Concepts
Types of valves
Types of actuators
Norms & Testing
Technical Literature
Software
Search
Valve
Actuator
Company
Company on the map
Updates
Requests for Quotation
Stocks
Articles
News
Trade Fairs
Courses
Job Offers
Tools
Miscellanea
Glossary
Links
Valvias Tv
Login sponsor
Sponsor Info
About Valvias
Contact
Site Map
Types of Valves Español
 
Multi-Turn Valves
Annular valve
Diaphragm valve
Fixed Cone valve
Gate valve
Needle valve
Pinch valve
Check Valves
Rubber Duck-Bill Check valve
Tilting Disc Check valve
Swing Check Valve
Quarter-Turn Valves
Ball valve
Butterfly valve
Plug valve
 
Google
Coefficients Cv Kv
Flow equations
Flanges
ANSI/ASME vs ISO
Valve books
Herpor valve engineering
Types of Valves

Valves can be classified by:

The operative of the valve closure member

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

Multiturn lineal motion globe valveMulti-turn valve (linear motion 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, Globe valve, Fixed cone valve, Needle valve and Pinch valve.

Quarter-turn valve (rotary 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: Ball valve, Butterfly valve, Plug valve, Spherical valve.

The functionality of the valve

• Control: pressure / flow rate regulation.

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

• Overpressure protection.

• Back flow prevention (check valve).

• On/Off service.

The nature and physical conditions of the flow

• 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).

Other forms of valve classification

• Admissible leakage level.

• Connection to the pipe.

• An unique direction of the flow or bidirectional flow.

• 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.

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

© 2007-2013 www.valvias.com, All Rights Reserved. Unauthorized reproduction prohibited.