Types of Gas Regulators Single-Stage vs. Two-Stage

University:
Massachusetts Institute of Technology
Course:
2.670 | Mechanical Engineering Tools
Academic year:

2021
Views:

374

Pages:

4
Author:

esfredint7qo

REGULATORS – ANOTHER DISTINCTION. “There are two types of regulators, the single-stage regulator and the two-stage regulator. The single-stage regulator reduces the cylinder pressure of the gas to a working pressure in one step. Single-stage regulators must be readjusted from time to time to maintain the required working pressure. The gas pressure in the cylinder decreases gradually as gas is withdrawn …. The two-stage regulator makes the reduction of pressure in two steps. The first step reduces the cylinder pressure to an intermediate pressure. The second step reduces the intermediate pressure to the desired working pressure. A two-stage regulator is simply two single-stage regulators in the same case. The two-stage regulator provides more accurate regulation and eliminates the need to readjust the regulator as the pressure in the supply tank is reduced.” TWO SAFETY CONSIDERATIONS CONCERNING START-UP. The regulator is to be ‘pinky loose’ before turning the cylinder’s valve ‘on’. It is recommended to stand to one side before turning the cylinder’s valve ‘on’. HOSES. “The gas hoses may be separate or moulded together. The green (or blue) hose is for oxygen, and the red (or orange) is for acetylene. The hose fittings are different to prevent hooking them up incorrectly. Oxygen hose has fittings with right-hand threads, and acetylene hose has fittings with left-hand threads.”* (REVERSE FLOW) CHECK VALVES. ‘(Reverse flow) check valves’ have been associated with stopping the flow of gas/gases moving in a ‘reverse direction’. With some torches, the reverse flow check valve is already ‘built in’.

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