Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice Air service units Series Airplus 2 Air treatment 2 | 65 ►Supply and discharge valves SAFELINE ►Interruption of supply and unloading of the downstream pneumatic circuit ►Single version classified in CATEGORY 1, suitable for use in safety circuits up to PL=c ►Double version classified in CATEGORY 4, suitable for use in safety circuits up to PL=e ►Compliance with the ATEX Directive and the Machinery Directive ►Solenoid valves with marking: II 3G Ex ec h IIC T6 Gc X II 3D Ex tc IIIC T85°C Dc X -10°C ≤ Ta ≤ +50°C Upon implementation of the size 3 AIRPLUS series air treatment units, Pneumax develops a supply and discharge valve, with an electropneumatic control and spring-return, fitted with a diagnostic system regarding the state of the valve, with the possibility of creating a double channel to determine the system’s redundancy. The version with one single channel emphasises the features of an S.V. 3/2 NC, monostable with electropneumatic control and spring-return, which operation involves: - condition of the valve at rest, with a de-energised coil; port 1 (air supply) is not connected to port 2 (downstream air circuit). port 2 is discharged through port 3; - condition of the valve activated, with an energised coil; port 1 (air supply) is connected to port 2 (downstream air circuit), with port 3 (discharge) closed. By de-energising the coil, the system resets the condition of valve at rest by means of the return spring, which repositions the spool. Once again port 2 (downstream air circuit), is discharged via port 3. The state of the valve is constantly monitored by a diagnostic system, using a Hall effect sensor, which reads the position of the spool and consequently takes note of the valve’s position. The sensor is in the ON state when the valve is at rest (de-energised coil), while it is in the OFF state when the valve is activated (energised coil). The sensor is in the OFF state under conditions of an activated valve (de-energised coil), indicating a possible problem. The version with a double redundant channel is made using two single solenoid valves 3/2 NC provided with diagnostics, mounted in series so that the port 2 of the first solenoid valve is linked to the port 1 of the second solenoid valve. It is sufficient that only one of the S.V. is de-energised to guarantee the discharge of the air circuit. If one of the two S.V. remained blocked due to a malfunction, the other one ensures the discharge function of the pneumatic installation. Even in this case, the diagnostic system of both solenoid valves constantly monitors the state of the 2 single S.V.
RkJQdWJsaXNoZXIy NzYzOTY1