Anti-explosion rotary switch, provided with visual signalling means and control means

Rotary switch (4) comprising:

• a switch body (8) which identifies an inner space (10) which rotatably houses a shaft (12) rotating around a rotation axis (X-X), operatively connected to an actuator device external to the switch (4), such as a valve or an actuator,
• a distribution valve (32) positioned outside said inner space (10) of the switch body (8) and pneumatically connectable to said external actuator device,
• a pneumatic connector (36) and at least one control means (40), such as a solenoid, operatively connected to the pneumatic connector (36),
• the pneumatic connector (36) being at least partially positioned in a side wall (48) of the switch body (8),
• the control means (40) being positioned in the inner space (10) of the switch body (8),
• the control means (40) being operatively connected to the external control device, the distribution valve (32) being pneumatically connectable to the external actuator and operatively connected to the control means (40) by means of the pneumatic connector (36), so as to permit its selective operation by the control means (40), characterised in that
• the pneumatic connector (36) defines at least one connection channel (44) placing the distribution valve (32) in fluidic connection with the control means (40), wherein the connection channel (44) crosses the pneumatic connector (36) which in turn crosses the side wall (48) of the switch body (8),
• wherein inside the connection channel (44) at least one anti-explosion means (52) is inserted, positioned coaxially to the connection channel (44) so as to reduce the through cross-section (56) thereof by a predefined length of the connection channel (44),
• wherein, at the anti-explosion or dust-prevention means (52), the through cross-section (56) is confined on an outer circular crown of the connection channel (44), delimited between an inner side wall (60) of the connection channel (44) and an external lateral wall (64) of the anti-explosion means (52).