A gas pressure reducer is a device for indicating or lowering the pressure of gas in a cylinder, gas pipeline or other container. It is also used for prolonged maintenance of this indicator at a constant level, regardless of external influences. Moreover, there are two types of such devices.
Reverse Acting Gearbox Working Principle
Devices of this type are characterized by an increasing characteristic, within which the working pressure is increased by decreasing the gas pressure inside the cylinder. Compressed gas in a container with a reverse-acting reducer enters the high-pressure chamber, after which the opening of the valves in the cylinder is blocked. Then the adjusting screw just needs to be turned clockwise for further gas flow into the burner.
The screw itself compresses the spring, and the latter, in turn, acts on a flexible rubber membrane that bends upward. Then the existing transfer disc with the stem also compresses the return spring, after which the valve is lifted and the opening for gas to pass into the low pressure chamber is opened.
The reducer maintains the working pressure at an automatically set level as follows - if the gas supply decreases, the device increases it by compressing the pressure spring and straightening the diaphragm. If the gas flow increases, then the device will perform the same actions, but exactly the opposite.
The reducer also has a pressure gauge for measuring the "height" pressure, as well as another similar device - for low pressure. If this indicator rises above the norm, then the device will slowly release or discharge gas into the atmosphere.
Direct acting gearboxes
The operation of direct-acting devices is carried out in a slightly different way. First, the gas enters the chamber through a special fitting and acts on the valve, trying to open it. The diaphragm then moves the pressure reducing valve away from the inner seat, thereby allowing gas to enter the low pressure chamber.
Moreover, this membrane is constantly under the influence of two forces - the pressure spring acts on it through the pressure screw, and on the other hand, the reduced gas exerts pressure on it, but already with low pressure, which is a counterweight to the pressure spring.
So, when the pressure spring is turned and the adjustment screw is unscrewed, the operating pressure decreases, and in the opposite case, it increases. Direct-acting gearboxes also have two monometers, but there is also an additional safety valve.
In the modern world, devices of the first type are more widespread, since, in contrast to direct-action gearboxes, they are considered more convenient and safer during operation.
