Soft start device for pneumatic systems and method for the...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 11/068 (2006.01) F15B 19/00 (2006.01) F15B 20/00 (2006.01)

Patent

CA 2715222

In a soft start device for pneumatic systems comprising a primary inlet (P1) where compressed air can be supplied at primary pressure, wherein the primary inlet (P1) is, via a valve circuit, connected to at least one secondary outlet (P2) which can be coupled to a load and where compressed air can be discharged at secondary pressure, the secondary pressure being lower than or equal to the primary pressure, wherein a main valve of the type 2/2 nc (normally closed) which can be bypassed by means of a bypass (17) is installed between the primary inlet (P 1) and the secondary outlet (P2), a restrictor device (13) being installed in the bypass (17), wherein the main valve (WV5) and the restrictor device (13) together with further directional valves (WV1, WV3, WV4, WV5, WV6) of the valve circuit are interconnected such and the valve circuit can be switched into a standard switching position for venting such that the secondary outlet (P2) is vented, the valves (W I, WV3, WV4, WV5, WV6) of the valve circuit are interconnected such that, in addition to the standard switching position for venting, several further switching positions for venting are possible, one of the further switching positions for venting being established if, in an operation which would normally initiate the standard switching position for venting, any one of the valves (WV1, WV3, WV4, WV5, WV6) malfunctions.

L'invention concerne un dispositif de mise en pression progressive de systèmes d'air comprimé, comportant une entrée primaire (P1) alimentée par de l'air comprimé sous une pression primaire, cette entrée primaire (P1) étant reliée par l'intermédiaire d'un circuit de valves à au moins une sortie secondaire (P2) qui peut être couplée à un consommateur et de laquelle sort de l'air comprimé sous une pression secondaire, inférieure ou égale à la pression primaire. Entre l'entrée primaire (P1) et la sortie secondaire (P2) est intercalée une valve principale du type 2/2-nc (normalement fermée) laquelle peut être contournée au moyen d'une dérivation (17), un dispositif d'étranglement (13) étant couplé sur cette dérivation (17), la valve principale (WV5) et le dispositif d'étranglement (13) étant couplés ensemble avec d'autres valves (WV1, WV3, WV4, WV5, WV6) du circuit et le circuit de valves pouvant être mis en position de purge standard de manière à purger la sortie secondaire (P2). Les valves (WV1, WV3, WV4, WV5, WV6) du circuit sont reliées entre elles de sorte que plusieurs positions de purge soient possibles en plus de la position de purge standard, une de ces autres positions de purge possibles intervenant lorsqu'une quelconque des valves (WV1, WV3, WV4, WV5, WV6) présente un dysfonctionnement lors d'un processus d'actionnement provoquant normalement la position de purge standard.

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