Structural principle of back pressure valve

The fluid enters from the inlet of the backpressure valve and is blocked by the diaphragm, causing upward pressure on the diaphragm. When the pressure is sufficiently high, the spring is compressed, and the fluid lifts the diaphragm to form a channel, flowing out from the outlet of the backpressure valve; If the fluid pressure is not enough, it will form a pressure hold, causing the inlet pressure to rise until it reaches the rated pressure, lifting the diaphragm to form a passage. The rated pressure of the backpressure valve can be adjusted, usually by adjusting the top rod of the spring to adjust the length of the spring.