Droop compensation regulating valve

[Detailed Description of the Invention]

[Industrial Application] The present invention relates to a gas pressure diaphragm control valve, and relates to natural gas and a gas pressure control valve usable to the both sides of liquefied petroleum gas (LP gas or propane) especially. [Description of the Prior Art] A gas pressure diaphragm type control valve is common knowledge in the technical field concerned. In this valve, downstream pressure and a gas mass flow are controlled by changing the amount of displacement from the valve seat which establishes a valve disk and the sheet assembly object which fits into it in the middle of the upstream part of a channel, and a downstream part and in which a valve opening, therefore a valve disk are related. Change a valve opening and desired downstream pressure is maintained, and pressure of gas and regulation of a flow are performed in order to send out the gas volume demanded by load. The general single stage control valve of low cost builds in the diaphragm which exhibits both the functions of measurement and a starting device, when downstream pressure is applied to the 1 side of a diaphragm to the power of the adjustment spring in which regulation of the side opposite to is free. Spring power holds the stem linkage mechanism with which a diaphragm and it were equipped in the position where the valve disk retreated from the valve seat at first. The flow of gas arises inside [ of a device ] the lower stream side further through a valve seat to a disk opening as upper pressure is introduced. By exerting downstream pressure on a diaphragm, it becomes possible to resist the power of an adjustment spring, to displace a diaphragm and to move a stem link and a valve disk to the position close to a valve seat by extension. Thus, by adjusting the load of an adjustment spring, downstream control pressure is determined and it is attained in balance of power between the load power of a spring, and the power applied to a diaphragm from downstream pressure. A linkage mechanism pushes a disk and is Open (although the pressure which acts is comparatively high, the mechanical advantage which drives a small diaphragm with very low downstream control pressure, and enables closing of a valve disk to a valve seat is provided.). A single stage control valve wears what is called r Droop " in its pressure and flow characteristic. Droop is caused by two factors. The 1st factor is that the power applied with an adjustment spring changes slightly, in order that the length may change during a run of a diaphragm, and the 2nd factor is for changing slightly in the usable area of a diaphragm according to movement of a diaphragm. By the synergistic effect, downstream control pressure will fall with the increase in a gas mass flow. It is claimed that therefore, r Droop carries out this pressure." A thing comparatively simple as a partial solving means for that and cheap, and effective is using the "speed reinforcing method" and exerting pressure slightly lower than the controlled downstream pressure on a diaphragm. As a result, a valve opening increases and the speed of a gas stream or the effect enhanced is acquired. The above-mentioned speed enhancing effect is attained by the Pitot tube which detects the low pressure in the constriction portion of a valve, or the Rising pressure pipe made to generate low pressure according to the increase in a diaphragm and the speed of the free passage To shake valve interior of a room. As another technique, what reduces effective pressure below to the controlled downstream pressure value is considered by attracting a valve room. While maintaining downstream pressure about natural gas and LP gas in home gas supply to the extremely low level of column-of-water pressure Udah of about 18 to 28 cmAq (7-11inch Aq), respectively, it is appliance inlet pressure, That is, it will be understood that it is necessary to maintain the upper pressure to Udah more than 4.22 kg/crt (609Si). In order to eliminate the overpressure conditions which may become serious in a downstream system and to make into the minimum the troublesomeness (and potential danger) which switches off the pilot light of a household appliance, the outstanding pressure release operation is needed. however, the request to a gas pressure regulator and the gas pressure regulator of especially a for [ domestic uses ] is the point that design compromise is needed in an easy mechanical apparatus, inside. For example, friction peculiar to a linkage mechanism, the hysteresis, or the backlash has reduced the consistency of adjustment machine performance. As already stated, it is united in the spring effect and the diaphragm effect, and causes Droop of output pressure. This Droop will be conquered only in the gas stream field in which it was only limited by inaccurate speed reinforcement art that it is under fixed appliance inlet pressure. In the linkage mechanism by the fixed mechanical conversion ratio, it is completely impossible to conquer Droop. in many examples in the art concerned, the safety relief valve is contained today in the actuator housing which was far apart from the main part which stores a valve seat, and after passing in the passage which had the overpressured downstream gas restricted, it is made to reach the safety relief valve for degassing, and appears in it. [Problem(s) to be Solved by the Invention] The main object of the present invention is to provide a new gas pressure control valve. Other objects of the present invention are to provide the single stage gas pressure control valve of direct-acting with the high performance of low cost suitable for a wide range use. The object of further others of the present invention is to provide the improved single stage gas pressure control valve. [Means for solving problem] The gas pressure control valve of the present invention conquers restrictions of the conventional technology mentioned above by using the combination of the orifice pipe which is a valve seat which has a characteristic cam stem and a Rising pressure pipe of one. Even if the above-mentioned characteristic total form cam stem is provided with the cam contour which operates directly by the adjustment spring and a diaphragm and there is no intervention of a linkage mechanism in any way, it moves a valve disk in the shape of a straight line into a valve seat, or is enabling release of engaging of clutch with a valve seat nonlinear. Although a high mechanical conversion ratio is provided when the above-mentioned cam stem needs to close a valve disk to a sheet, The rapid nonlinear opening of a valve disk is attained, Boosting effect is caused mechanically, and only a mechanical conversion ratio low for maintaining desired downstream control pressure is shown in all gas stream states. Since the shape determines the space between an orifice edge of a winding instrument and a valve output and the space controls shortly a suction operation of the diaphragm cavity which is a downstream pressure measuring element of a regulator, an orifice pipe serves to adjust uniformly by causing the Rising pressure by a gas stream. The above-mentioned composition can put a diaphragm to the gas stream room of large capacity, and it provides the protection or relief performance to the relief sheet of the large area on a cam stem, and the conjointly outstanding overpressure. The direct-acting type regulation-of-pressure valve of the present invention is suitable for both natural gas or the LP gas use in this way only by only changing the load of the safety relief valve spring in which predetermined regulation is possible. According to the present invention, a removable Rising pressure cap is provided to an orifice pipe. The Boost cap is considered more considerably than the path of an orifice pipe as the path or the design to which controlled Boosting effect is brought since it is small and has an orifice whose path is moreover quite bigger than the path of a valve seat. In order to use a Boost cap with the orifice pipe which has a corresponding valve seat of a size, when manufactured by the orifice of different size, it becomes possible to realize each operational characteristic which suited a different environmental condition in an ordinary valve design. Similarly, the present invention contains the unique valve disk holder which carries out a straight-line motion within an orifice pipe. In order to minimize friction on an operation easily, the parts which carry out relative motion are manufactured with the plastic material which has the different characteristic. [Example] Hereinafter, the example of illustration of the present invention is further explained in full detail. If Drawing 1 is described, control valve 10 by the present invention shall be provided with spring casing 12, and this spring casing 12 shall be assembled by the means on a control valve main part, i.e., casing lower half 14, conventionally [ arbitrary ]. These casings are made [, having a flange mutually fixed along with the circumference by a suitable screw fastener and the screw hole corresponding to this for example, or ]. The detailed structure omits illustration. Top room 16 is formed in spring casing 12, and mass lower room 18 is formed in control valve main part 14. Annular diaphragm 20 made from an elastomer separates both A room mutually, and it fixes this diaphragm 20 to diaphragm head 21 of the diameter of a large. The perimeter portion which makes the round shape of diaphragm 20 is pinched between the flanges of spring casing 12 and control valve main part 14. The inner side portion of diagram plum 20 is fixed to diaphragm head 21 by adhesion etc. Erect cylindrical shape color 19 is arranged in the center of diaphragm head 21. Diaphragm head 21 is not made solid but is considered as the composition which provided upheaval crown 13 which has a plurality of big openings 13a (only one of them is illustrated partially). These openings 13a shall be sealed from lower room 18 with relief sheet 30 of the large area which presents cup shape, and this relief sheet shall form the one portion of cam stem 26 during regular work. It cannot be overemphasized that relief sheet 30 can be considered as the composition only stuck on cam stem 26. Color 19 of diaphragm head 21 provides cylinder mailbox 28 attached slidably in cam stem 26. This cylinder mailbox 28 is formed in orifice 19a which carried out the same form within color 19, and suiting D form section shape. Relief spring 46 is arranged between color 19 of diaphragm head 21, and fixing means 48, and the pressure for making it seal below diaphragm 20 with a relief sheet is produced. Fixing means 48 is made [ constituting from an end with a screw of cylinder mailbox 28, and regulation Nut to screw, or ]. In a suitable example, the metal annular color which has a circular opening corresponding to cylinder mailbox 28 is provided in fixing means 48, and after Prediction pressure of the relief spring 46 is carried out to that request spring power, this color shall make a waveform to the prescribed position of the upper part of cylinder mailbox 28, and shall suit it. According to this composition, a series of manufacture common differences will be eliminated, and the homogeneity of product performance will improve. In the case of regular operation pressure, relief spring 46 loads Preload force so that it may not move to diaphragm head 21 or cam stem 26, therefore relief shift 30 may maintain the engagement state below diaphragm 20. When a diaphragm and a relief sheet are engaged, the gas stream way from control valve main part 14 to spring casing 12 does not exist. Under overpressure conditions which diaphragm head 21 drives in the direction of the upper part to cam stem 26, The seal between diaphragm 20 and lily Fusi 30 is destroyed, and orifice 13a in upheaval crown 13 of diaphragm head 21 and the gas stream which goes to top room 16 through 13b occur from lower room 18 of the relief sheet 30 neighborhood. The rapid flow of emission gas which passes through the inside of orifice 13b of the flank of upheaval crown 13 with upheaval crown 13 in addition to the gas stream in orifice 13a of the upper part is permitted. The latter flow is barred a little with regulation spring 36. In short, relief performance is assisted by having provided upheaval crown. Closing cap 49 closes the upper part of spring casing 12. Adjustment spring 36 which can be adjusted is arranged between diaphragm head 21 and top spring sheet 39. Spring sheet 39 is formed in the bottom of adjustment screw 38, and since the power applied with adjustment spring 36 on a diaphragm head is fluctuated, it is made to rotate, and this adjustment screw makes displacement perpendicularly possible. Run stopper 42 which projects downward on cap 40 is formed, and limitation of upper part Move of cam stem 26 is enabled, It closes according to discontinuation of a gas demand, and switches a control valve to relief operation compulsorily at the time of malfunction of the valve mechanism which stops releasing the overpressure which arises as the result by regular relief operation. Air supply port 22 and exhaust air port 24 are established in control valve main part 14, and connection of a control valve with the pipeline (not shown) into whom gas flows is enabled. adjusting air supply port 22 and exhaust air port 24 in the direction of an axis like illustration -- thereby -- the inside of a pipeline -- comparatively -- true -- it is desirable in whether a direct gas stream way is formed. Cam stem 26 is stopped in stem end 32 which has the cam contour of the front part or cam surface 33, and the rear cam contour or cam surface 34 formed in the same shape. Stem end 32 makes rectangle openings 53a and 53b in cylinder orifice pipe 50 penetrate, and it makes it extend. This cylinder orifice pipe 50 shall have the length which continues and extends into the considerable portion of the distance between air supply port 22 and exhaust air port 24. Fix orifice pipe 50 in control valve main part 14, it is made to cooperate with the inner wall of air supply port 22 with O-ring 54, and an airtight seal is formed. Taper portion 51 is provided in orifice pipe 50, the approach which results in it is formed and circular valve seat 52 is constituted. By providing Rising pressure cap 80 which similarly gives a speed enhancing effect to the gas stream which penetrates orifice pipe 50 in orifice pipe 50, and attracting fluid indoors by the flow velocity, slightly small pressure is generated rather than being able to set below diaphragm 20 in exhaust air port 24. Holding valve disk 60 with disk holder 58, this disk holder 58 enables movement of the inside of orifice pipe 50 horizontally according to the vertical migration of right-angled cam stem 26 to it. This shall be attained by cam follower surface 62.63 on disk holder 58 which can be engaged for front part cam surface 33 on stem end 32. If other drawings are referred to, a clear passage will limit movement of disk holder 58 to the straight-line motion of the direction of an axis within an orifice pipe by a pair of slot in orifice pipe 50. One side (70) of an above-mentioned pair of slots is partially expressed by Drawing 1. Engaging of clutch of the biased spring 64 is carried out to rear cam surface 34 of stem end 32, and the function to compensate the hysteresis effect under valve operation is demonstrated. Boost cap 80 is fixed to the end of orifice pipe 50 by a plurality of fingers 84.84a, enabling free attachment and detachment so that it may mention below. In order to correct Boosting effect by suction of lower room 18, orifice 82 is provided behind Rising pressure cap 80. Diaphragm 20 bottom makes it open for free passage the channel between air supply port 22 and exhaust air port 24, and directly. relief sheet 30 on cam stem 26 with this big composition -- conjointly -- the above -- When (when delivery pressure (downstream pressure) increases suddenly, a rapid and effective high-pressure release operation is enabled.) Direct conversion of the vertical migration of cam stem 26 is carried out to the straight line class leveling movement to valve seat 52 of valve disk 60. The linkage mechanism accompanied by friction loss or mechanical play, i.e., a lever, and the pivot are not contained. Therefore, according to the above-mentioned composition of the present invention, it has exact control of delivery pressure and a flow, or the pressure release characteristic which is possible and was excellent, and, moreover, the direct-acting type control valve of low cost with an easy structure is realized. Drawings 2 and 3 are the top views and sectional views showing diaphragm 20 and diaphragm head 21, and express more clearly orifices 13a and 13b in upheaval crown 13 especially. On diaphragm head 21, a plurality of upheaval sides aiming at reinforcement are fabricated. In order to enable attachment of a diaphragm easily between the up-and-down casings of a control valve, a plurality of holes 20a at equal intervals are formed in diaphragm 20. Hole 19a of the 0-character shape in color 19 shall be made to cooperate with a type-like section in Mr. Hitoshi of cylinder mailbox 28 on the upper part of stem 26, and it shall assemble easily by giving directivity between the inside of the Porto hole of cam stem 26 and a valve. the -- when the detailed structure of the present invention is further explained, referring to a 4~lO figure, Drawing 4 is an enlarged drawing which fractures disk holder 58 and specifies valve disk 60. As for this disk 60, it is desirable for charges of an elastic material, such as a synthetic rubber, to constitute, and to hold in the suitable hollow in the front end of disk holder 58. the side portion before a Circular table form [ holder / 58 / disk ], and Hub -- the flat main part of a diamond form is provided, and a Notch part is formed in the main part, and parallel side wall 72.74 of a pair of inner sides, back wall 76, and the last wall formed of cam follower 62.63 are limited. Inside back wall 76, biased spring 64 fixed by ultrasonic weld etc. is arranged. Biased spring 64 makes engagement possible elastically with rear cam contour 34 on stem end 32 of cam stem 26. By providing a pair of the parallel extensions or wings 57.57a which have two incomes with a pair of parallel slots 68.70 which countered the diametral direction within the internal surface of orifice pipe 50 in disk holder 58, movement within the orifice pipe of disk holder 58 is limited to axis directional movement. 1st and 2nd protruded pieces 55 for attachment are provided in the front end of orifice pipe 50, and mounting hole 55a for fixing an orifice pipe in casing lower half 14 of a control valve is formed. Form circular sulcus 67 in expansion part 65 on the rear of orifice pipe 50, these circular sulci are made to cooperate with finger 84.84a, and fixation of Rising pressure cap 80 in a prescribed position is enabled. As illustration, cam follower side 62.63 shall be flat and shall make a predetermined angle mutually. A cam follower side is made to cooperate with front part cam contour 33 on cam stem 26, disk holder 58 is moved, and the gas stream opening between valve disks 60 is controlled by valve seat 52. Cam contour 33 and cam follower side 62.63 are considered as the conversion ratio of the power of Hub 4:1, or the composition obtained, and when required, they certainly enable [ easy and ] closing of a valve disk. A valve disk stabilizes regulation [ gas flows ] of a between as Taber shape from which the mechanical conversion ratio of Hub 2:1 is obtained, and it considers it as the composition which can secure necessary capacity. Drawings 9 and 10 are the top views and sectional views showing Rising pressure cap 80 by the present invention, respectively. Boost cap 80 is formed in the shape of a cup, a plurality of fingers 84 are provided so that it may stop within latch part 85, and these latch parts 85 are made to extend in the direction of the circumference around base 83 in which hole 82 was formed. The rectangle rib aiming at reinforcement is made to extend along the lateral surface of finger 84. Another finger 84a is inserted from the perimeter side of Rising pressure camp 80, and it is made to stop by latch part 86 displaced from latch part 85 of finger 84 to the inner side. By the front of latch part 86, surface 88 supported by the back of the lower part of cam stem 26 is formed during an operation. This is as having shown clearly in Drawing 4. Finger 84a is shown to the prescribed position by the figure with the latch part which engages with the back wall of rectangle opening 53b in orifice pipe 50. Engaging of clutch of the latch part 85 is carried out to circular sulcus 67 of the body rear of orifice pipe 50 as most clearly expressed by Drawing 5. The end elevation of Drawing 8 which removed cap 80 and expressed specifies that disk holder 58 is settled in orifice pipe 50 in the suitable direction by having a size from which parallel wings 57.57a of disk holder 58 differ. Although this feature is effective in assembling a mechanism immediately, it should not be considered to be a limited element of the present invention in what kind of sense, either. If it returns to Drawing 4, back wall 69 of top slot 53a in orifice pipe 50 inclines. For this reason, where Rising pressure cap 80 is set to a prescribed position, cam stem 26 can be inserted into orifice pipe 50. As mentioned above, the surface on latch part 86 of finger 84a forms the guide to the backside of the lower part of cam stem 26. Difficulty accompanying the hysteresis or mechanical backlash which produces the variation in regulation in both upper pressure and downstream load, or the changing bottom as described above, It is possible to solve by providing cam contour 34 which carried out the form same on the rear of end 22 of cam stem 26 by composition of the present invention. Biased spring 64 is located along with cam contour 34, and it is intermittently driven in order to carry out engaging of clutch of the cam surface 33 to related cam follower surface 62.63. For this reason, a hysteresis effect decreases, and it can contribute in order to make performance of a regulator into what was extremely consistent under cycle-izing of load, and change of appliance inlet pressure. A regulator is desirable in whether a lightweight high intensity material constitutes according to the cost design object. It can do [ realizing lightweight nature, intensity, and the low friction characteristic or ] by manufacturing a cam stem, an orifice pipe, and a disk holder with the engineering plastic material etc. which have advanced self-lubricity. As mentioned above, the parts which carry out relative motion consist of different-species materials. That is, nylon constitutes valve disk holder 58 like Rising pressure cap 80, and it forms the support face of orifice pipe 50 and cam stem 26. The latter is manufactured with an acetal plastic. So, '1! In slot 70.68, t57.57a runs aground easily and slides also on cam stem 26 easily to cam surface 62.63 of an orifice pipe, and the surface of Winga 84a. A diaphragm can be manufactured by the arbitrary common knowledge elastomer material used for this object. As for a cam stem and a relief sheet, it is desirable to carry out integral moulding. Similarly, although a valve seat is considered as a separate insertion, integral moulding can be carried out as some orifice pipes. The size of orifice 82 in Boost cap 80 is changed, and it becomes possible by changing the size of the orifice in valve seat 52, and the shape on the surface of a cam to realize the low cost gas pressure control valve of the single stage corresponding to wide range environment and working condition. In fact, the size of a valve seat orifice and a Rising pressure orifice becomes in order to make a specific operational characteristic agree, and it is changed into a pair. The more it is small in the orifice in a Rising pressure cap like common knowledge, a lot of thing gas distributes to a lower room via rectangle opening 53a in an orifice pipe, and 53b, and, the more Boosting effect especially in a large flow is reduced. It cannot be overemphasized that it can carry out with various appearances like Deformed, without not limiting the present invention only to the specific example mentioned above, and deviating from the technical scope.

[Brief Description of the Drawings]

Drawings 1 are a sectional view of the control valve by one example of the present invention, and Drawing 2, The top view of the diaphragm assembly object of the control valve of Drawing 1, and Drawing 3, It is a perspective view which the elements on larger scale and Drawing 5 in which the sectional view which meets 3-3 line of Drawing 2, and Drawing 4 show the cam stem of a present invention control valve, a Rising pressure pipe, a cap, and an alignment movement disk holder fracture the top view of the composition of Drawing 4, and Drawing 6 fractures a part of composition of Drawings 4 and 5, and is shown, In Drawing 10, Drawing 9 of Ah is To at the elevational view of the structure of Drawing [ in / in the partial diagrammatic view and Drawing 8 which Drawing 7 drew along 7-7 line of Drawing 4 / the removal state of a Rising pressure cap ] 5, the front view of a Rising pressure cap of the present invention, and the sectional view that meets 10 -10 line of Drawing 9. 10 ... Control valve 14 ... Casing lower half 18 ... Lower room 19a ... Orifice 21 ... Diaphragm head 24 ... Exhaust air port 30 [ ... Cam follower 12 / ... Spring casing 16 / ... Top room ] ... Relief sheet 46 ... Relief spring 58 ... Disk holders 62 and 63 19 ... Color 20 ... Diaphragm 22 ... Air supply port 26 ... Cam stem 33 ... Cam surface 50 -.. Orifice pipe 60 ... valve disk 84, 84 a ... finger FIG. FIG. FIG. Eight pieces FIG. 1 *