LPG pressure regulator valve

The pressure reducing valve is installed on the angle valve of the liquefied gas cylinder, connects the angle valve and the rubber hose, reduces the inlet pressure to the required outlet pressure, and keeps the outlet pressure automatically stable. It is an important gas equipment in the matching of gas stoves. Some product packaging is also called a voltage regulator.

The pressure of the liquefied gas in the steel cylinder is usually 4~6 pressures (one pressure is one atmospheric pressure, about 100Kpa), and the pressure is relatively high. Directly connecting the high voltage to the stove will cause hidden dangers, and it is easy to cause leakage during combustion. Three large amounts of gas rush out to produce powerful flames, which greatly wastes energy, and incomplete combustion will produce toxic carbon monoxide gas, which is harmful to the human body.

From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and regulation system to balance the fluctuation of the post-valve pressure with the spring force, so that the post-valve pressure remains constant within a certain error range.

When the liquefied petroleum gas comes out of the steel cylinder, it is a high-pressure gas and reaches the decompression chamber through the intake pipe. When the user turns off the switch of the gas appliance, as the liquefied petroleum gas entering the decompression chamber increases, the pressure rises, and the pressure is pressed by the spring. The rubber film is pushed up, and part of the air in the upper air chamber is discharged from the valve body through the breathing hole. In this way, the lever is forced to move upwards, the valve port is closed by the leverage action, and the passage of the liquefied petroleum gas inlet is cut off, the pressure at the outlet of the pressure reducing valve will no longer rise. When the switch of the gas appliance is turned on, the liquefied petroleum gas flows out from the pressure reducing valve, causing the pressure in the pressure reducing chamber to drop, and the rubber film is concave, driving the lever to move down, and the external air enters the upper air chamber from the breathing hole, causing the valve pad to move downward. Moving in the middle, the intake nozzle becomes larger, the intake air volume increases, and the pressure increases. This repeated adjustment process makes the pressure of the decompression chamber always constant, that is, no matter whether the intake pressure is high or low, the outlet pressure is always stable, so as to achieve the function of decompression and pressure stabilization.