Purpose Of LPG Gas Valve and Its Benefits The main LPG Valves on the LP gas bottles incorporate a safety feature called a pressure relief valve (PRV). If pressure goes above a safe level, an LPG gas bottle will function as long as the PRV is opened to release the excess pressure. To minimize and maintain stable working pressure of the LPG gas, the use of LPG-propane pressure regulators is used. LPG can be converted from gas to a liquid state using simple pressure reduction or refrigeration. To enable use of the same burner controls, and to ensure similar burning characteristics, LPG can be mixed with air to create a synthetic natural gas (SNG) which is readily substitutable. LPG, when vaporized and under ambient pressure, has a higher heat content meaning LPG cannot be substituted simply for natural gas. It makes only sense for LPG to be stored and transported as liquid in cylinders of gas at atmospheric pressure.
The actual LPG working pressure of an LPG gas appliance is considerably lower than 2.75kPa (LPG bottle pressure) pressure of an LPG gas tank. The LPG is converted back into gas when it leaves the gas cylinder-bottle LPG, and it passes through a gas regulator, where pressure is released using part of the gas. The Gas Pressure Regulator Valve releases some of the gas to relieve the pressure, should the gas inside the LPG gas bottle increase in pressure from fires or other sources of heat. Given sufficient duration and intensity of the fire, the pressure generated from boiling and expanding gas may exceed the capacity of an approved pressure relief valve to vent the excess pressure. As a result, the maximum pressure in the propane tank would never be more than that, and therefore the valve would be opened to let out any gases, thus decreasing the LPG pressure inside the tank, and never reaching its maximum rated pressure. Pressure regulators for both natural gas and LPG propane appliances operate with different pressures, 1.1 and 2.75 kPa, respectively. A gas valve assembly is required for each motor, controlling the engines specific gas pressure. The solenoid valves used in furnaces control when the gas is turned on, and are lit with the pilot light to produce heat.