Gas reducer: device and principle of operation
Gas reducer: device and principle of operation
The gas reducer is a devicefor indicating or lowering the gas pressure in a cylinder, a gas pipeline or in another container. It is also used for prolonged maintenance of this indicator at a constant level, regardless of extraneous effects. And there are two types of similar devices.
Principle of operation of the reverse action reducer
For devices of this type is typicalan increasing characteristic in which the operating pressure is increased by decreasing the gas pressure inside the cylinder. The compressed gas in the tank with the reverse-action reducer enters the chamber with high pressure, after which the valves in the cylinder are opened. Then the adjusting screw must simply be rotated clockwise for further gas flow into the burner. The screw itself compresses the spring, and the latter, in turn, acts on the flexible rubber membrane, which is bent upwards. Then, the existing transfer disc with the stem also compresses the return spring, after which the valve rises and the gas passage opens into the low pressure chamber. 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 also correcting the diaphragm. If the gas flow rises, the device will perform the same actions, but with the exact opposite. The pressure gauge also has a pressure gauge for measuring the "height" of the pressure, and another similar device for low pressure. If this indicator rises above the norm, the device will slowly release or throw gas into the atmosphere.Reducers of direct action
A somewhat different work is donedevices of direct action. First, the gas enters the chamber through a special nozzle and acts on the valve, trying to open it. After that, the membrane withdraws the reducing valve from the internal seat, thereby opening the gas to the chamber with low pressure. For 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 it is pressurized by it too gas, but already with low pressure, which is a counterweight to the pressure spring. So, when the spring is turned and the adjusting screw is turned off, the working pressure is reduced, and in the opposite case, it increases. Two pressure gauges are also installed on the direct-action gearboxes, but there is an additional safety valve. In the modern world, the first type is the most widely used, as they are considered more convenient and safe in operation, unlike direct-action gearboxes.
