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2. Distributors
2.1 Function and classification
The function of pneumatic directional control valves is to direct the flow of air between a source and a receiver. They direct pneumatic power between source and actuator, or actuator and return to atmosphere.
Valves are classified according to two functional characteristics: number of ports, number of positions.
Let be : X/Y, X number of ports, Y number of switching positions.
Some applications require the use of a three-position valve with a central neutral position. Three types of central position are generally used: either all connections are shut off, or the service connections are exhausted, or still supplied (figure
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Distributors
Bibliography
Standards
- Transmissions hydrauliques et pneumatiques ; Alésages des vérins et diamètres des tiges de piston ; Série métrique - ISO 3320 - 01-10-1987
- Transmissions hydrauliques et pneumatiques ; Vérins ; Dimensions et types de filetage des tiges de piston - ISO 4395 - 01-09-1978
- Pneumatic transmissions – Distributors with five main orifices – Part 1: Installation drawings without electrical connector - ISO 5599-1 - 01-08-2001 ...
Manufacturers – Suppliers
(non-exhaustive list)
Readers are referred to the following organization:
UNITOP – Union Nationale des Industries de Transmissions Oléo hydrauliques et Pneumatiques
Websites to consult
ISO International Organization for Standardization http://www.iso.orghttp://www.iso.ch/iso/fr
AFNOR Association française de normalisation http://www.afnor.org
UNM Union...
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The Ultimate Scientific and Technical Reference