Abstract: A valve body has an inflow passage for a working fluid, an outflow passage for the working fluid, and a pressure relief passage, which connects the inflow passage and the outflow passage by bypassing a normally close valve seat. A pressure relief valve is located in the pressure relief passage. The pressure relief valve closes the pressure relief passage, if a pressure of the working fluid in the outflow passage is lower than, is equal to, and is higher by a pressure difference less than a predetermined relief pressure than a pressure of the working fluid in the inflow passage. The pressure relief valve opens the pressure relief passage, if the pressure of the working fluid in the outflow passage is higher by a pressure difference equal to or higher than the relief pressure than a pressure of the working fluid in the inflow passage.

Abstract: To provide a sludge treatment method and a sludge treatment system suppressing the fuel costs which can be utilized in the existing treatment facilities that drying and discharging after dehydrating a sludge as a useful improvement for the facility. This invention provides the solution means including a dehydration step of obtaining a dehydrated sludge, a liquefaction step of obtaining a slurry-like sludge, a branching step of branching a digested sludge, a vacuum deaeration step of deaerating a first digested sludge, a reprocessing step of ejecting a high-temperature steam and returning a concentrated digested sludge, a dehydration separation treatment step of separating a second digested sludge, a step of deaerating a digested sludge, a branching step of branching the mixed phase fluid, a step of returning a first mixed phase fluid, and a step of returning a second mixed phase fluid.

Abstract: To provide a sludge treatment method and a sludge treatment system suppressing the fuel costs which can be utilized in the existing treatment facilities that drying and discharging after dehydrating a sludge as a useful improvement for the facility. This invention provides the solution means including a dehydration step of obtaining a dehydrated sludge, a liquefaction step of obtaining a slurry-like sludge, a branching step of branching a digested sludge, a vacuum deaeration step of deaerating a first digested sludge, a reprocessing step of ejecting a high-temperature steam and returning a concentrated digested sludge, a dehydration separation treatment step of separating a second digested sludge, a step of deaerating a digested sludge, a branching step of branching the mixed phase fluid, a step of returning a first mixed phase fluid, and a step of returning a second mixed phase fluid.

Abstract: The method of carbonization of organic waste according to the present invention comprises the steps of supplying organic waste to a dryer, reducing an amount of water in the organic waste by heating with high-temperature gas, supplying the organic waste to a carbonization furnace for carbonizing the organic waste in a high-temperature ambience, removing carbide from the carbonization furnace, incinerating gas, which is generated in the carbonization furnace, in a re-incinerating furnace, and supplying combustion gas of the re-incinerating furnace to the dryer as the high-temperature gas.

Abstract: The method of carbonization of organic waste according to the present invention comprises the steps of supplying organic waste to a dryer, reducing an amount of water in the organic waste by heating with high-temperature gas, supplying the organic waste to a carbonization furnace for carbonizing the organic waste in a high-temperature ambience, removing carbide from the carbonization furnace, incinerating gas, which is generated in the carbonization furnace, in a re-incinerating furnace, and supplying combustion gas of the re-incinerating furnace to the dryer as the high-temperature gas.