초록 ▼

A pressure relief valve has a main valve body, a fluid inlet passageway, a fluid outlet passageway, and a piston contained within the main body. The piston has a piston head, slidingly and sealingly engaged within a pressurized cavity in the main valve body. The piston head's principal face, having

A pressure relief valve has a main valve body, a fluid inlet passageway, a fluid outlet passageway, and a piston contained within the main body. The piston has a piston head, slidingly and sealingly engaged within a pressurized cavity in the main valve body. The piston head's principal face, having a given surface area, is exposed to a pressurized gas in the cavity. A piston stem, connected to the piston head, is in sliding communication with a packoff assembly and has an exposed face whose surface area is smaller than the piston head's principal face. The piston stem's exposed face is in communication with the pressurized gas or fluids to be regulated. In operation, a gas or fluid pressurized to a predetermined value in the pressurized cavity acts against the piston head, forcing one or more ports in the piston stem sidewall to be sealed from the fluid outlet passageway. When pressurized gas or fluid in a pressure containment structure with which the pressure relief valve is in communication exceeds a second predetermined value, the pressurized gas or fluid in the pressure containment structure acts against the piston stem exposed face and forces the piston to move, exposing the ports in the piston stem to the fluid outlet passageway, thus relieving the excess pressure in the pressure containment structure. The packoff assembly has a wiper element slidingly and sealing in communication with the piston stem and keeps the piston stem and ports clear of contaminants.

대표청구항 ▼

A pressure relief valve has a main valve body, a fluid inlet passageway, a fluid outlet passageway, and a piston contained within the main body. The piston has a piston head, slidingly and sealingly engaged within a pressurized cavity in the main valve body. The piston head's principal face, having

A pressure relief valve has a main valve body, a fluid inlet passageway, a fluid outlet passageway, and a piston contained within the main body. The piston has a piston head, slidingly and sealingly engaged within a pressurized cavity in the main valve body. The piston head's principal face, having a given surface area, is exposed to a pressurized gas in the cavity. A piston stem, connected to the piston head, is in sliding communication with a packoff assembly and has an exposed face whose surface area is smaller than the piston head's principal face. The piston stem's exposed face is in communication with the pressurized gas or fluids to be regulated. In operation, a gas or fluid pressurized to a predetermined value in the pressurized cavity acts against the piston head, forcing one or more ports in the piston stem sidewall to be sealed from the fluid outlet passageway. When pressurized gas or fluid in a pressure containment structure with which the pressure relief valve is in communication exceeds a second predetermined value, the pressurized gas or fluid in the pressure containment structure acts against the piston stem exposed face and forces the piston to move, exposing the ports in the piston stem to the fluid outlet passageway, thus relieving the excess pressure in the pressure containment structure. The packoff assembly has a wiper element slidingly and sealing in communication with the piston stem and keeps the piston stem and ports clear of contaminants. ther the mixture liquid consisting of the chemical and the rinsing liquid or the rinsing liquid selectively, and wherein the ozone water generating mechanism is located in the rinse supplying pipeline between the rinse source and a junction where the chemical supplying pipeline is joined to the rinse supplying pipeline. 2. A cleaning and drying apparatus as claimed in claim 1, wherein the container, defining the drying chamber has a cover covering an upper space of the processing bath and being provided on the processing bath detachably. 3. A cleaning and drying apparatus as claimed in claim 1, wherein the container has a plurality of exhaust ports formed in the periphery of a lower part thereof, for discharging gas supplied into the drying chamber. 4. A cleaning and drying apparatus as claimed in claim 1, wherein the ozone water generating mechanism is activated when forming protective oxidation film on the surface of the object, not activated when a process of rinsing only by rinsing liquid or a process of eliminating natural oxidation film by chemical liquid. 5. A cleaning and drying apparatus as claimed in claim 1, further comprising a dry gas source communicating with the drying chamber through a dry gas pipeline. 6. A cleaning and drying apparatus as claimed in claim 5, further comprising a gas heating mechanism provided on the dry gas pipeline. 7. A cleaning and drying apparatus for an object to be treated, comprising: a cleaning chamber defined by a processing bath storing a chemical liquid or a rinsing liquid, for washing the object therein; a drying chamber defined by a container, for drying the object; a chemical source for supplying chemical liquid for eliminating natural oxidation film from the object to the processing bath; a rinse source for supplying rinsing liquid to the processing bath; a rinse supplying pipeline connecting the rinse source with the processing bath; an ozone water generating mechanism, provided on the rinse supplying pipeline, for generating ozone water for forming protective oxidation film on the object; and a flow switching valve provided on the rinse supplying pipeline between the rinse source and the ozone water generating mechanism, the flow switching valve having a first position, a second position and a third position, the first position of the valve giving large quantity of flow when only rinsing liquid is provided to the processing bath, the second position of the valve giving medium quantity of flow when chemical liquid is provided to the processing bath, the third position of the valve giving medium quantity of flow when ozone water is provided to the processing bath. 8. A cleaning and drying apparatus for an object to be treated, comprising: a cleaning chamber defined by a processing bath storing a chemical liquid or a rinsing liquid, for washing the object therein; a drying chamber defined by a container, for drying the object; a chemical source for supplying chemical liquid for eliminating natural oxidation film from the object to the processing bath; a rinse source for supplying rinsing liquid to the processing bath; a rinse supplying pipeline connecting the -rinse source with the processing bath; an ozone water generating mechanism, provided on the rinse supplying pipeline, for generating ozone water for forming protective oxidation film on the object; and a temperature regulating mechanism provided on the rinse supplying pipeline between the rinse source and the ozone water generating mechanism for regulating temperature of the rinsing liquid. 9. A cleaning and drying apparatus as claimed in claim 8, wherein the temperature regulating mechanism is activated and controls predetermined temperature of hot ozone water, hot rinsing liquid and hot chemical liquid respectively, where a processing liquid is needed to be higher temperature than normal temperature such as when forming a protective oxidation film with hot ozone water, when rinsing the object wit