The present invention provides a pressure control apparatus for controlling the pressure at an output port without reducing the effective sectional area by controlling a main valve through the switching operation of a small-sized directional control valve, wherein the main valve has any of the follo
The present invention provides a pressure control apparatus for controlling the pressure at an output port without reducing the effective sectional area by controlling a main valve through the switching operation of a small-sized directional control valve, wherein the main valve has any of the following functions, i.e. a function of-providing a valve full-open position, a function of reducing pressure, and a function of providing a valve full-closed position. When a diaphragm chamber is placed at the secondary pressure by switching the directional control valve, the primary pressure is reduced by the main valve, and a predetermined reduced pressure is outputted. When the diaphragm chamber is at the primary pressure, the main valve is fully closed. When the diaphragm chamber is at the atmospheric pressure, the main valve fully opens, and hence the primary-side fluid flows to the output port as it is.
대표청구항▼
What is claimed is: 1. A pressure control apparatus comprising: a pressure control apparatus body; a main valve and a diaphragm provided in said pressure control apparatus body; a directional control valve provided in connection with said pressure control apparatus body; a passage for communication
What is claimed is: 1. A pressure control apparatus comprising: a pressure control apparatus body; a main valve and a diaphragm provided in said pressure control apparatus body; a directional control valve provided in connection with said pressure control apparatus body; a passage for communication between a supply port and an output port, said main valve being disposed in said passage; a diaphragm chamber formed by said diaphragm; a valve spring for urging said main valve in a direction in which it is closed; and a pressure regulating spring acting on said diaphragm to urge said main valve in a direction in which it opens, wherein force acting on said diaphragm changes in accordance with a switching operation of said directional control valve, and hence a pressure at said output port changes; wherein said diaphragm chamber and a small output port of said directional control valve are communicated with each other, and in accordance with the switching operation of said directional control valve, said diaphragm chamber is placed at a secondary pressure of said output port or at an atmospheric pressure, wherein when said diaphragm chamber is at the secondary pressure, a primary pressure flows to said output port after being reduced to a set pressure by said main valve, and when said diaphragm chamber is at the atmospheric pressure, said main valve fully opens. 2. A pressure control apparatus according to claim 1, further comprising: a shell disposed in a center of said diaphragm; and a stem connected at a proximal end thereof to a main valve element of said main valve and disposed so that a distal end of said stem abuts against said shell. 3. A pressure control apparatus according to claim 1, wherein said directional control valve has two small input ports, one of said small input ports being communicated with an atmosphere, and the other of said small input ports being communicated with the output port of said pressure control apparatus body. 4. A pressure control apparatus according to claim 3, further comprising: an adapter provided on a side of said pressure control apparatus body, said directional control valve being connected to an outside of said adapter; wherein the small output port of said directional control valve is communicated with said diaphragm chamber through a first A output communicating passage formed in said adapter and a first B output communicating passage formed in said pressure control apparatus body, and one of said small input ports of said directional control valve is communicated with the atmosphere through a first input communicating passage formed in said adapter, and wherein a second A input communicating passage is formed in said adapter, and a second B input communicating passage is formed in said pressure control apparatus body, said second A input communicating passage and said second B input communicating passage being communicated with each other through a communicating pipe, and the other of said small input ports of said directional control valve is communicated with the output port of said pressure control apparatus body through said second A input communicating passage, said communicating pipe and said second B input communicating passage. 5. A pressure control apparatus including: a pressure control apparatus body; a main valve and a diaphragm provided in said pressure control apparatus body; a directional control valve provided in connection with said pressure control apparatus body; a passage for communication between a supply port and an output port, said main valve being disposed in said passage; a diaphragm chamber formed by said diaphragm; a valve spring for urging said main valve in a direction in which it is closed; and a pressure regulating spring acting on said diaphragm to urge said main valve in a direction in which it opens, wherein force acting on said diaphragm changes in accordance with a switching operation of said directional control valve, and hence a pressure at said output port changes; said pressure control apparatus comprising: a central communicating passage formed in the passage for communication between said main valve and said output port: adapter connecting openings formed in two side surfaces, respectively, of said pressure control apparatus body, said adapter connecting openings being communicated with said central communicating passage through respective pressure communicating passages; an adapter connected to one of said adapter connecting openings; a pressure gauge provided in said adapter so that the pressure at said output port is transmitted to said pressure gauge through said central communicating passage and said pressure communicating passage; and a blanking plate assembly for closing the other of said adapter connecting openings. 6. A pressure control apparatus comprising: a pressure control apparatus body; a main valve and a diaphragm provided in said pressure control apparatus body; a directional control valve provided in connection with said pressure control apparatus body; a passage for communication between a supply port and an output port, said main valve being disposed in said passage; a diaphragm chamber formed by said diaphragm; a valve spring for urging said main valve in a direction in which it is closed; and a pressure regulating spring acting on said diaphragm to urge said main valve in a direction in which it opens, wherein force acting on said diaphragm changes in accordance with a switching operation of said directional control valve, and hence a pressure at said output port changes; wherein said diaphragm chamber and a small output port of said directional control valve are communicated with each other, and in accordance with the switching operation of said directional control valve, said diaphragm chamber is placed at a secondary pressure of said output port or at a primary pressure of said supply port, wherein when said diaphragm chamber is at the secondary pressure, the primary pressure flows to said output port after being reduced to a set pressure by said main valve, and when said diaphragm chamber is at the primary pressure, said main valve is fully closed; wherein said directional control valve has two small input ports, one of said small input ports being communicated with the supply port of said pressure control apparatus body, and the other of said small input ports being communicated with the output port of said pressure control apparatus body; an adapter provided on a side of said pressure control apparatus body, said directional control valve being connected to an outside of said adapter; wherein the small output port of said directional control valve is communicated with said diaphragm chamber through a first A output communicating passage formed in said adapter and a first B output communicating passage formed in said pressure control apparatus body, and one of said small input ports of said directional control valve is communicated with the supply port of said pressure control apparatus body through a third A input communicating passage formed in said adapter and a third B input communicating passage formed in said pressure control apparatus body, and wherein a second A input communicating passage is formed in said adapter, and a second B input communicating passage is formed in said pressure control apparatus body, said second A input communicating passage and said second B input communicating passage being communicated with each other through a communicating pipe, and the other of said small input ports of said directional control valve is communicated with the output port of said pressure control apparatus body through said second A input communicating passage, said communicating pipe and said second B input communicating passage.
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이 특허에 인용된 특허 (2)
Rinkewich Isaac (4822 Garden View Ter. Hightstown NJ 08520), Electrically-operated control valve and water distribution system including same.
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