Air priority valve for a compressed air system

G - Physics – 05 – D

Patent

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Details

G05D 16/20 (2006.01) F04B 49/22 (2006.01) F15B 11/16 (2006.01)

Patent

CA 2339505

A priority valve (50) for a compressed air system (10) in a tire retreading plant includes a solenoid controlled, diaphragm operated valve (52) connected at an inlet to an autoclave (40). A solenoid (54) controls whether the valve is opened or closed. A switch (70) has a pressure sensor connected to an inlet side. If the pressure falls below a low pressure limit, the switch (70) activates the solenoid to close the valve, thus shutting off the air supply to the autoclave (40). With the inlet to the autoclave closed, the air compressor (20) is able relatively quickly and easily to raise the pressure in the system above the low pressure limit. The valve (54) remains closed until the sensed pressure rises to a value sufficient to supply both the other equipment (28, 30) and the autoclave.

L'invention concerne une soupape (50) de priorité pour un système (10) d'air comprimé dans un atelier de rechapage de pneumatiques comprenant une soupape (52) à diaphragme commandée par un solénoïde (54) connectée à une entrée d'air d'une autoclave (40). Un solénoïde commande l'ouverture et la fermeture de la soupape. Un commutateur (70) comporte un capteur de pression connecté à un côté d'entrée d'air. Si la pression descend au-dessous d'une limite inférieure de pression, le commutateur (70) actionne le solénoïde pour qu'il ferme la soupape, empêchant ainsi l'alimentation en air de l'autoclave (40). Lorsque l'entrée d'air de l'autoclave est fermée, le compresseur (20) d'air peut de façon relativement rapide et facile élever la pression, dans le système, au-dessus de la limite inférieure de pression. La soupape (54) reste fermée jusqu'à ce que la pression captée atteigne une valeur suffisante pour alimenter à la fois l'autre équipement et l'autoclave.

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