Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D16/00—Control of fluid pressure
  • G05D16/04—Control of fluid pressure without auxiliary power
  • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D16/00—Control of fluid pressure
  • G05D16/04—Control of fluid pressure without auxiliary power
  • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
  • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
  • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
  • G05D16/0663—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using a spring-loaded membrane with a spring-loaded slideable obturator
  • G05D16/0669—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using a spring-loaded membrane with a spring-loaded slideable obturator characterised by the loading mechanisms of the membrane
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
  • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
  • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure

Definitions

• the present invention reduces the pressure of steam, air, and other fluids supplied from a high-pressure supply source to a required level, and continuously supplies the fluid while constantly maintaining the required level of pressure.
• the present invention relates to a direct-acting pressure-reducing valve device used for performing pressure reduction. Background art
• a direct acting type pressure reducing valve device has a valve casing in which an inlet chamber and an outlet chamber are defined, and a valve casing formed in a valve casing so as to open and close a valve opening formed in a partition separating the chambers from each other. And a control device mounted on the valve casing to control the operation of the valve element in response to the outlet pressure of the fluid flowing through the pressure reducing valve device.
• a bellows is provided as a pressure-sensitive operating means in a control device, and the pressure-sensitive chamber defined by the nozzle is provided in a pressure-sensitive chamber. The outlet pressure of the fluid is applied.
• the output end of the bellows is connected to the valve element via an operating stem extending through the valve casing. I am linked with my child.
• a guide hole is formed in an orifice plate that has a bezel to connect the pressure-sensitive chamber in the bellows to the outlet chamber of the valve casing, so that the operating stem can be moved up and down.
• the pressure of the fluid flowing from the inlet chamber of the valve casing into the outlet chamber through the valve opening changes the pressure of the orifice plate.
• the diameter of the orifice is led to the pressure-sensitive chamber in the bellows as a control device for the valve element.
• the output of the bellows is adjusted to the position where the force equivalent to the product of the secondary pressure of the fluid and the effective pressure receiving area of the pressure sensing chamber balances the elastic biasing force acting on the bellows in the opposite direction.
• the displacement of the end causes the valve element to respond to the secondary pressure of the fluid, thereby determining the opening of the valve.
• the opening of the valve increases to increase the fluid supply amount, and conversely, the consumption amount decreases and the consumption amount decreases.
• the opening of the valve decreases and the fluid supply decreases, thus exerting an adjustment function to maintain the set supply pressure of the fluid.
• the set supply pressure itself can be adjusted, for example, by changing the elastic biasing force acting on the bellows.
• the direct-acting pressure reducing valve device has a simpler structure and is less prone to failure than a so-called pilot-operated pressure reducing valve device. Also, while the fluid leakage is small, the difference between the set pressure and the actual secondary pressure when the fluid flow rate is gradually increased from the minimum adjustable flow rate to the rated flow rate while the primary pressure is kept constant However, the so-called offset gradually increases, and thus has a disadvantage that the rated flow must be set to a relatively low value.
• an object of the present invention is to provide an improved linear motion capable of minimizing a tendency of an offset increase with an increase in fluid consumption while maintaining the advantages of the conventional structure described above. And a pressure reducing valve device.
• a direct-acting pressure reducing valve device comprises a valve casing, wherein an inlet chamber and an outlet chamber for fluid are defined in the valve casing, and the inlet is provided in the valve casing.
• a partition is provided for separating the chamber and the outlet chamber from each other.
• the partition has a valve seat having a valve opening extending from one side thereof to the other side.
• a valve element elastically biased toward the valve seat; and a valve element mounted on the valve casing, the valve element being responsive to an outlet pressure of the fluid.
• a control device for controlling the operation comprising: a pressure-sensitive operating means for limiting a pressure-sensitive chamber for applying the outlet pressure of the fluid; and the valve opening An operating step extending coaxially through the outer wall of the casing and linking the valve element with the pressure-sensitive actuating means; provided on the outer wall of the valve casing; an axis of the operating stem; And a guide member for guiding the sliding displacement in the direction.
• the guide member communicates a pressure-sensitive chamber of the pressure-sensitive operating means with an outlet chamber of the valve casing to reduce the pressure of the fluid in the outlet chamber.
• a pressure guiding channel for transmitting only the static pressure component to the pressure-sensitive chamber is formed.
• the present invention has examined the factors that cause the offset of the secondary pressure from the set pressure in the prior art described above, and as a result, focused on the fact that such an offset depends on the change in the flow rate of the fluid.
• the flow rate change corresponding to the change in the flow rate of the fluid acts as a change in the dynamic pressure component of the secondary pressure in addition to the pressure-sensitive chamber in the bellows. It is based on the knowledge that it causes
• the pressure-guiding flow path that communicates the pressure-sensitive chamber and the outlet chamber of the valve casing transmits only the static pressure component of the secondary pressure to the pressure-sensitive chamber, thereby resulting from fluctuations in dynamic pressure.
• FIG. 1 is a longitudinal sectional view of a direct acting pressure reducing valve device according to one embodiment of the present invention
• 2 (a) and 2 (b) are a plan view and a cross-sectional view taken along the line AA of a retaining ring for attaching a guide member to the valve casing in the pressure reducing valve device of FIG.
• FIG. 3 is a longitudinal sectional view of a guide member in the pressure reducing valve device of FIG. 1,
• FIGS. 4 (a), (b) and (c) are front, bottom and side views of the guide member shown in FIG.
• FIG. 5 is a graph showing the flow rate dependent characteristics of the pressure reducing valve device according to the present invention in which the secondary pressure is reduced.
• valve casing 1 which defines a fluid inlet chamber 2 and an outlet chamber 3 therein.
• the mounting screws 2A and 3A on the inlet side and outlet side of the pressure reducing valve with respect to the fluid supply pipe not shown are arranged coaxially with each other.
• a partition wall 4 for separating the inlet chamber 2 and the outlet chamber 3 from each other, and the partition wall 4 has a valve opening 5A for communicating the inlet chamber 2 with the outlet chamber 3 when the valve is opened.
• remove the valve seat member 5. wear.
• the valve seat member 5 is arranged such that a substantially conical valve seat is located on the inlet chamber 2 side.
• a valve element 6 is arranged in the inlet chamber 2 of the valve casing 1 so as to face the valve seat, and this valve element is constituted by a ball in the illustrated embodiment.
• a compression coil spring 7 for resiliently biasing the valve element 6 toward the valve seat is provided, and the coil spring is housed inside the cylindrical strainer member 8.
• the strainer member 8 has an upper end portion connected to the outer peripheral portion of the bottom surface of the valve seat member 5 by a bottom opening 9 formed on the bottom surface of the valve casing 1 and coaxially with the valve opening 5A. It is held at a predetermined position.
• the pressure reducing valve device further includes a control for controlling the operation of the valve element 6 in response to the secondary pressure in the outlet chamber 3 of the fluid supplied to the required external device through the pressure reducing valve. Equipped with equipment.
• This control device is built in a cover member 11 which is screwed to the upper part of the valve casing 1 in the embodiment shown in the drawing, and has a lower end formed on the top wall of the valve casing 1 by a lower end outer peripheral surface of the cover member.
• Bellows 13 sealed and fastened to the outer surface
• spring receiving member 14 sealed and fastened to the upper end or output end of the bellows, and a pressure adjusting spring force acting on this spring receiving member It is constituted by a pressure-sensitive operating means 12 including a compression coil spring 15.
• adjusting sleeve 16 is engaged with the upper end of the compression coil spring 15 so that the spring force can be changed, and the sleeve does not rotate relative to the cover member 11.
• a detent structure can be realized, for example, by making each of the cross-sectional shapes of the adjusting sleeve 16 and the portion of the cover member 11 adjacent to the adjusting sleeve non-circular.
• the adjusting spindle 17 is screwed to the adjusting sleeve 16, and the spindle projects outside from the top of the cover member 11 through the bush 18.
• the adjustment knob 19 is fixed to the protruding end of the spindle 17 by, for example, a spring pin 20. According to such a configuration, the user raises and lowers the adjusting sleeve 16 by appropriately rotating the adjusting knob 19, and changes the adjusting spring force by the coil spring 15 as necessary. Becomes possible.
• the space defined by the base 13 of the pressure-sensitive operating means 12 and the spring receiving member 14 together with the top wall of the valve casing 1 forms a pressure-sensitive chamber 21 for applying a secondary pressure of the fluid as described later. I do. Then, at a position where the force corresponding to the product of the pressure acting in the pressure sensing chamber 21 and the effective pressure receiving area of the bellows 13 is balanced with the pressure adjusting spring force of the compression coil spring 15, the output end of the pressure sensing operation means 12 is A state of equilibrium is reached. Therefore, if the valve element 6 is linked to the output end of the pressure-sensitive operating means 12, the valve element 6 can respond to the secondary pressure of the fluid.
• the valve element 6 has a valve opening 5A and a valve casing 1
• the lower end of the operating stem 22 extending through the top wall is integrally attached, and the upper end of the operating stem is elastically pressed against the center of the spring receiving member of the pressure-sensitive operating means 12.
• a guide member 23 having a guide hole which is in sliding contact with the operation system 22 is provided on the top wall of the valve casing 1.
• a top opening is formed in the top wall of the valve cage 1 coaxially with the valve opening 5A, and a flange 24 which is supported on a mounting surface on the periphery thereof is provided on the inner member 23.
• a circumferential groove is formed on the periphery of the opening of the page at a position aligned with the upper surface of the flange 24, and the retaining ring 25 is mounted in the groove.
• the guide member 23 is detachably fixed to the valve casing 1 by the retainer ring 25.
• the retainer ring 25 is formed, for example, by bending into a polygonal shape as shown in FIGS. 2 (a) and 2 (b). It is desirable to use an input line.
• the guide member 23 fixed to the valve casing 1 as described above has the outlet chamber 3 of the valve casing communicated with the pressure-sensitive chamber 21 of the pressure-sensitive operating means 12, and the fluid in the outlet chamber is exclusively provided.
• a pressure guiding channel for transmitting only the static pressure component of the pressure into the pressure chamber 21 is formed.
• the valve opening in the outlet chamber 3 A boss 26 protruding toward 5A is integrally formed with the flange 24, and a guide hole 27 of a sufficient length for stably guiding the operating system 22 of the valve element 6 is formed in the boss.
• a radial protruding portion 28 protruding from the axial protruding end of the boss 26 toward the downstream side of the fluid is provided, and the pressure guiding passage 29 is formed from the radial protruding end of the protruding portion 28 of the guide member 23. It is formed as an L-shaped channel that passes through the inside of the boss 26 and reaches the outer surface of the flange 24.
• the guide member 23 having such a configuration exerts a two-sided function of accurately transmitting the static pressure component of the secondary pressure to the pressure sensing chamber 21 and sufficiently guiding the operation stem 22 of the valve element 6. It is.
• the fluid such as steam supplied from a high-pressure source (not shown) to the inlet chamber 2 is a gap between the valve seat and the valve element 6 in the valve seat member 5. Therefore, the pressure is reduced according to the opening of the valve and flows into the outlet chamber 3.
• This pressure reduction value that is, the pressure on the secondary side of the fluid in the outlet chamber 3 can be set to a required value by manual adjustment of the adjustment knob 19 as described above. Further, by linking the valve element 6 with the pressure-sensitive operating means 12 via the operating stem 22 to respond to the secondary pressure, a decrease in the secondary pressure is detected when the fluid consumption increases, and the valve is opened.
• the pressure reducing valve device of the present invention has a conventional structure in that a regulating function of continuously supplying a required amount of fluid while maintaining the secondary pressure of the fluid at a desired level is exhibited. There is no difference from the thing.
• the valve element 6 since the valve element 6 is configured to respond only to the rose static pressure component of the secondary pressure of the fluid, the dynamic pressure component of the secondary pressure accompanying the increase or decrease of the fluid consumption is increased. Undesirable effects due to fluctuations can be effectively eliminated, and the tendency for offsets to increase as the flow rate increases can be significantly reduced.
• the offset of the secondary pressure near the rated flow rate can be almost halved compared to that of the conventional structure, and the dependency of the secondary pressure on the flow rate can be reduced.
• This has the advantage that it is possible to largely eliminate the tendency of reduction having the above.
• the present invention can be achieved without requiring a particularly complicated configuration of the pressure reducing valve device.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Control Of Fluid Pressure (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=15550902

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Citations (2)

Family Cites Families (2)

• 1984
  • 1984-10-09 JP JP1984152914U patent/JPS6170212U/ja active Pending
• 1985
  • 1985-10-09 WO PCT/JP1985/000558 patent/WO1986002471A1/ja not_active Application Discontinuation
  • 1985-10-09 EP EP19850905103 patent/EP0199819A4/en not_active Withdrawn
• 1986
  • 1986-06-09 KR KR1019860700340A patent/KR880700196A/ko not_active Application Discontinuation

Patent Citations (2)

Non-Patent Citations (1)

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