A quick-action bleeder valve device for a pneumatic actuator of a pneumatic system, includes: a housing; a first connection which is connectable to a chamber of the actuator, which chamber can be ventilated and bled; a second connection which is connectable directly or indirectly to a compressed air source; a flow duct, formed in the housing, between the first connection and the second connection, the flow duct being constricted at a constriction point or throttle point by a reduced flow cross section; a diaphragm valve, arranged in the housing, including at least one diaphragm which interacts with a valve seat, wherein in an open position of the diaphragm valve, in which the diaphragm is lifted off from the valve seat, a pressure sink is connected to the first connection, and in a closed position of the diaphragm valve, in which the diaphragm is seated on the valve seat in a seal-forming fashion, this connection is interrupted; wherein at least part of a first effective area of the diaphragm, which effective area pushes the diaphragm valve into the open position under pressure loading, is loaded at least by a third pressure prevailing in a first section of the flow duct between the first connection and the constriction point or throttle point, wherein a second effective area of the diaphragm, which effective area pushes the diaphragm valve into the closed position under pressure loading, is loaded by a second pressure prevailing in the reduced flow cross section at the constriction point or throttle point or by a first pressure prevailing in a second section of the flow duct between the second connection and the constriction point or throttle point, wherein the diaphragm is pushed into the closed position by a pressure spring arrangement, and wherein the first effective area, the second effective area, the pressure spring arrangement and the flow cross sections in the first section, in the second section and at the constriction point or throttle point of the flow duct are configured so that: (i) in the case of a ventilation flow, directed from the second connection to the first connection, for ventilating the pneumatic actuator by the compressed air source, the closing forces which act on the second effective area and originate from the second pressure or from the first pressure and from that of the pressure spring arrangement hold the diaphragm valve in the closed position, or move it into said position, counter to the effect of the opening forces which act on the first effective area and originate at least from the third pressure, and (ii) in the case of a bleeding flow, directed from the first connection to the second connection, for bleeding the pneumatic actuator, the opening forces which act on the first effective area and originate at least from the third pressure hold the diaphragm valve in the open position, or move it into said position, counter to the effect of the closing forces which act on the second effective area and originate from the second pressure or from the first pressure and from that of the pressure spring arrangement.
QUICK-ACTION BLEEDER VALVE DEVICE FOR PNEUMATIC ACTUATORS OF PNEUMATIC SYSTEMS, AND PNEUMATIC SYSTEM HAVING A QUICK-ACTION BLEEDER VALVE DEVICE OF THIS TYPE
2016-11-10
Patent
Elektronische Ressource
Englisch
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