Emergency Valve

An emergency valve, wherein the emergency valve comprises:

• a valve body comprising an emergency cavity, a pressure increasing cavity and an inflation cavity which are spaced apart from one another, wherein an extension direction of the pressure increasing cavity is the same as an extension direction of the inflation cavity, an air inlet of the emergency cavity is in communication with a train pipe, the pressure increasing cavity is provided with a first communication port, a second communication port and a relief port, the relief port of the pressure increasing cavity is located between the first communication port of the pressure increasing cavity and the second communication port of the pressure increasing cavity, the first communication port of the pressure increasing cavity is in communication with a brake cylinder, the second communication port of the pressure increasing cavity is in communication with the emergency cavity, the relief port of the pressure increasing cavity is in communication with an accelerated relief air cylinder, a valve sleeve is arranged in the inflation cavity, and an outer side wall of the valve sleeve is attached to a cavity wall of the inflation cavity and divides the inflation cavity into a driving cavity and a non-return cavity;
• a pressure increasing valve core movably arranged in the pressure increasing cavity, wherein an outer side wall of the pressure increasing valve core is attached to an inner side wall of the pressure increasing cavity, the first communication port of the pressure increasing cavity and the second communication port of the pressure increasing cavity respectively correspond to both ends of the pressure increasing valve core, the pressure increasing valve core is provided with a vent hole, a first end of the vent hole is in communication with the first communication port of the pressure increasing cavity, a second end of the vent hole penetrates through a side wall of the pressure increasing valve core, the pressure increasing valve core has a communication position and a pressure maintaining position, when the pressure increasing valve core is located in the communication position, the second end of the vent hole is in communication with the relief port of the pressure increasing cavity, and when the pressure increasing valve core is located in the pressure maintaining position, the second end of the vent hole is isolated from the relief port of the pressure increasing cavity;
• and
• an inflation valve core comprising a first valve core and a second valve core, wherein the first valve core is movably arranged in the driving cavity and divides the driving cavity into a first driving cavity and a second driving cavity, an air outlet of the first driving cavity is in communication with the emergency cavity, the second driving cavity is in communication with an emergency chamber, the second valve core is movably arranged at an air outlet of the non-return cavity, an air inlet of the non-return cavity is in communication with the brake cylinder, the air outlet of the non-return cavity is in communication with an air inlet of the first driving cavity, an end of the first valve core is movably arranged in the valve sleeve, and the first valve core has an inflation position for pushing the second valve core away from an air outlet of the inflation cavity and a blocking position for releasing the second valve core,
• wherein the valve body is further provided with a communication passage, the second communication port of the pressure increasing cavity is in communication with the emergency cavity through the communication passage, and the air outlet of the first driving cavity is in communication with the emergency cavity through the communication passage.