Natural gas and liquefied gas conversion valve and gas heater

A natural gas and liquefied gas conversion valve comprises a natural gas nozzle and a liquefied gas nozzle and further comprises a reversing valve body, a valve deck, a valve rod, a valve element, anend cover and a gas inlet piece. The natural gas nozzle is installed at the gas outlet end of the gas outlet channel, the liquefied gas nozzle is installed on the liquefied gas nozzle installation hole, the gas inlet cylinder is in rotating fit with the valve element cavity, and the valve rod is connected with the connecting base and is in rotating fit with the valve rod hole. The end cover is buckled with the air inlet seat, and the air inlet piece is connected and communicated with the end cover; when the valve core is in a certain phase, the valve core seals the gas inlet end of the naturalgas guide channel and is in a liquefied gas state; and when the valve core is in another phase, the air outlet of the valve core is communicated with the natural gas guide passage and is in a naturalgas state. Due to the adop