Working principle of one way throttle valve

Working principle of one way throttle valve：

During refrigeration, the refrigerant flows in from the bottom port of the one-way throttle valve, the valve core is pushed upward, and the refrigerant can smoothly flow out of the valve seat cavity through two through holes, and then through the one-way throttle valve. During heating, the refrigerant flows in from the top port of the one-way throttle valve and enters the valve seat cavity from the throttle opening at the top of the valve seat. The valve core blocks two through holes due to the thrust and gravity of the refrigerant. The refrigerant is forced to flow through the throttle hole for auxiliary throttling and then flows out of the one-way throttle valve.