JP6332088B2 - Integrated compound steam valve - Google Patents

Description

  The present invention relates to an integrated composite steam valve, and more particularly to an integrated composite steam valve that can control steam supplied to a steam turbine.

  In a steam turbine used in a power plant, a steam valve is usually installed on the inlet side of steam supplied from a boiler or the like. A steam valve requires low pressure loss to improve the efficiency of the steam turbine. At the same time, the steam valve is used in a harsh environment as a device that first receives high-temperature and high-pressure steam, and from the viewpoint of protecting the steam turbine, High reliability is required as an operation end of turbine control. Therefore, the steam valve is generally installed as a pair of a stop valve for shutting off the steam and an adjusting valve for controlling the flow rate of the steam.

  Conventionally, as a structure in which a pair of stop valves and control valves are installed, an integrated composite steam valve disclosed in Patent Document 1 is known. In this integrated composite steam valve, both a stop valve and an adjusting valve are provided in the same valve box. The stop valve includes a stop valve main body provided so as to be capable of reciprocal movement, and the steam flow is blocked by the tip (lower end) of the stop valve main body contacting the seat surface in the casing. Further, by separating the tip of the stop valve body from the seat surface, the interruption of the steam flow is released and the steam flows.

  The adjusting valve in the integrated composite steam valve includes an adjusting valve body formed in a cylindrical shape. The adjusting valve main body is also provided so as to be able to reciprocate, and the flow rate of the flowing steam is controlled by adjusting the separation width between the tip (lower end) and the seat surface in the valve box. Here, the stop valve body of the stop valve is disposed inside the cylindrical adjusting valve body.

International Publication No. 2012/146482

  However, in Patent Document 1, since the stop valve body is disposed inside the adjusting valve body, the diameter of the adjusting valve body becomes large. For this reason, when the area on which the steam pressure acts in the adjusting valve main body is widened, particularly in the operation where the valve opening is about the middle, the adjusting valve is likely to receive an excitation force by the steam passing through the valve box. There is. In addition, there is a problem that the steam that has passed through the control valve is disturbed by the stop valve body and pressure loss increases.

  Moreover, in patent document 1, the complicated subvalve structure for reducing the operation force at the time of valve opening of a stop valve is needed for a stop valve main body, and there exists a problem that a component increases.

  The present invention has been made in view of such a situation, and can reduce the excitation force received by the adjusting valve, reduce the number of components with low-pressure loss, and reduce the operating force. An object is to provide a composite steam valve.

An integrated composite steam valve according to the present invention includes a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjustment valve provided in the same valve box. In the integrated composite steam valve, the stop valve includes a stop valve body that is formed in a cylindrical shape and that contacts the valve seat when the valve is closed, while the adjusting valve is a regulator that contacts the valve seat when the valve is closed. A valve main body, the adjusting valve main body is disposed inside the stop valve main body, an upper portion of the valve chamber is opened, the valve chamber is provided with a valve lid for closing the opening, and the adjusting valve is has a first projecting portion, the valve lid, characterized Rukoto which having a first bracing section for guiding the first projecting portion during the operation of the control valve. The integrated composite steam valve according to the present invention includes a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box, The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjusting valve contacts the valve seat when the valve is closed. A regulating valve body, and the regulating valve body is disposed inside the stop valve body, and when the stop valve is closed, a contact surface of the valve seat with the stop valve body opens and closes the stop valve. It is formed along a direction substantially orthogonal to the operation direction. The integrated composite steam valve according to the present invention includes a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box, The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjusting valve contacts the valve seat when the valve is closed. An adjusting valve main body, and the adjusting valve main body is disposed inside the stop valve main body, and guides an opening / closing operation of the stop valve and the adjusting valve between the adjusting valve main body and the stop valve main body. The stop valve is positioned so that the outer peripheral surface on the distal end side of the stop valve body and the outer peripheral surface on the distal end side of the guide are continuously connected when the stop valve is opened. It is characterized by that. The integrated composite steam valve according to the present invention includes a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box, The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjusting valve contacts the valve seat when the valve is closed. An adjusting valve main body, and the adjusting valve main body is disposed inside the stop valve main body, and guides an opening / closing operation of the stop valve and the adjusting valve between the adjusting valve main body and the stop valve main body. A cylindrical guide is provided, and a tapered surface is formed on the distal end side of the stop valve body and the distal end side of the guide, respectively, and when the stop valve is opened, the tapered surface of the stop valve body and the The tapered surface of the guide is disposed along the same surface.

  According to the present invention, since the adjusting valve main body is disposed inside the stop valve main body, the adjusting valve main body can be downsized in accordance with the opening diameter of the valve seat. Thereby, the area on which the pressure of the steam acts in the control valve main body can be reduced, and the control valve can be prevented from being excited by the flowing steam. On the other hand, although the stop valve body is enlarged, the operating force when the stop valve is opened can be reduced by optimizing the area in contact with the valve seat. Thus, since the conventional complicated subvalve structure can be made unnecessary, the number of components can be reduced.

It is the schematic block diagram of the integrated composite steam valve according to the present embodiment, partly in vertical section. It is AA arrow sectional drawing of FIG. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the state which opened the stop valve from the state of FIG. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the state which opened the adjustment valve from the state of FIG. It is a principal part enlarged view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram in which a part of the integrated composite steam valve according to the present embodiment is viewed in a longitudinal section. FIG. 2 is a cross-sectional view taken along line AA in FIG. In the following description, unless otherwise specified, terms representing positions and directions are used with reference to FIG.

  As shown in FIGS. 1 and 2, the integrated composite steam valve 10 according to the present embodiment is configured by providing a stop valve 12 and an adjusting valve 13 in the same valve box 11. The integrated composite steam valve 10 is installed on the steam inlet side of a steam turbine (not shown), shuts off the steam supply by a stop valve 12 in an emergency, and is supplied from a steam source such as a boiler by an adjusting valve 13. Control the flow rate of steam. The flow rate of steam supplied from a steam source such as a boiler is controlled by the control valve 13, or the supply of steam is shut off by the stop valve 12 in an emergency. FIG. 1 shows a state in which both the stop valve 12 and the control valve 13 are closed. The steam turbine in which the integrated composite steam valve 10 according to the present embodiment is installed can be applied to a power plant such as geothermal or thermal power, and can also be applied to a plant using any other fluid such as a gas other than steam. May be.

  Inside the valve box 11, a steam inlet portion 16, a valve chamber 17, and a steam outlet portion 18 are formed in order from the upstream side of the steam flow. The steam inlet portion 16 includes a flow path for introducing steam from the lateral direction (right direction) of the valve chamber 17. The steam outlet 18 includes a flow path for discharging steam that has passed through the valve chamber 17 downward. Therefore, in the valve box 11, the steam introduced laterally from the steam inlet portion 16 is turned from the steam outlet portion 18 by changing the direction of 90 ° in the valve chamber 17.

  The inner peripheral surface on the side of the valve chamber 17 is formed in a substantially spherical shape, although a rib or the like is partially formed. Inside the valve chamber 17, a strainer 20 for removing foreign substances contained in the steam is provided. The strainer 20 is formed with a large number of holes penetrating the inside and outside of the side surface of the cylindrical body at predetermined intervals. The central axis C of the cylindrical body is directed in the vertical direction and is the same as the steam outlet 18. (See FIG. 3). Since the foreign material having a predetermined size or larger is removed by the strainer 20, the steam turbine connected to the stop valve 12 and the adjusting valve 13 located on the downstream side of the strainer 20 and the integrated composite steam valve 10 is caused by the foreign material. Can be protected from failure.

  A cylindrical valve seat 21 is arranged at a position extending from the valve chamber 17 to the steam outlet 18. The seat portion 21a of the valve seat 21 is formed by a tapered surface that decreases in diameter as it goes downward. The seat portion 21 a is formed so as to be smoothly connected to the inner peripheral surface on the side of the valve chamber 17.

  An upper portion of the valve chamber 17 is opened, and a valve lid 23 that closes the opened portion is fixed via a fastener (not shown) such as a bolt. The valve lid 23 has a lid body 28 through which one first valve shaft 25 and two second valve shafts 26 (not shown in FIG. 2) penetrate vertically. The first valve shaft 25 is disposed on the same central axis as the strainer 20 and the steam outlet 18, and the second valve shaft 26 is disposed at a position equidistant from the left and right of the first valve shaft 25. . Guide bushes 29 and 30 (guide bushes 30 not shown in FIG. 2) are provided on the outer circumferences of the valve shafts 25 and 26 to guide the reciprocating motions in the axial direction. It is buried in. Holes are formed in the side surfaces of the guide bushes 29 and 30, and the holes communicate with a leaked steam recovery path 31 (not shown in FIG. 2) extending through the lid main body 28. The leaked steam recovery path 31 recovers the steam leaked from the gaps between the valve shafts 25 and 26 and the guide bushes 29 and 30 to a predetermined steam circulation system.

  Seal structures 33 and 34 (the seal structure 34 is not shown in FIG. 2) are provided around the valve shafts 25 and 26 on the upper surface of the lid main body 28 to restrict the leakage of steam to the atmosphere.

  A support base 37 is provided above the valve lid 23 via a stand 36. A first drive mechanism 38 that reciprocates the first valve shaft 25 in the vertical direction is provided on the support base 37. The first drive mechanism 38 includes a first hydraulic cylinder 41 including a first cylinder rod 40 extending in the up-down direction, and a first urging unit provided on the support base 37 and provided around the first cylinder rod 40. 42. The lower end of the first cylinder rod 40 is connected to the upper end of the first valve shaft 25 via a connection structure 43. The first urging means 42 is configured by disposing an elastic body such as a leaf spring or a coil spring in the housing, and applies a force that displaces the first cylinder rod 40 downward. The first hydraulic cylinder 41 displaces the first cylinder rod 40 and the first valve shaft 25 upward against the force of the first urging means 42 by supplying high pressure oil from the outside.

  The two second valve shafts 26 are provided so as to be reciprocated in the vertical direction by the second drive mechanism 45. The second drive mechanism 45 includes a second hydraulic cylinder 47 (not shown in FIG. 2) provided on the support base 37 with a second cylinder rod 46 (not shown in FIG. 2) extending in the vertical direction. A spring seat 49 connected to the upper end side of each second valve shaft 26, and a second urging means 50 interposed between the upper surface of the spring seat 49 and the lower surface of the support base 37 are provided. The second urging means 50 is made of an elastic body such as a coil spring, and exerts a force for displacing the spring seat 49 downward. The second urging means 50 is disposed on the same central axis as the first cylinder rod 40 and the first valve shaft 25.

  The lower end of the second cylinder rod 46 is connected to the lever 53 via a link bar 52 (not shown in FIG. 2) so as to be relatively rotatable. The lever 53 extends in the left-right direction with the connection position as the center. One end (right end) of the lever 53 is pivotally supported via a bracket 54 (not shown in FIG. 2) extending downward from the support base 37, and the other end (left end) side can swing in the vertical direction. . The lever 53 supports the spring seat 49 from below on the other end (left end) side. The second hydraulic cylinder 47 displaces the second cylinder rod 46 upward by supplying high-pressure oil from the outside. By this displacement, the other end of the lever 53 is displaced upward via the link bar 52 against the force of the second urging means 50, and the spring seat 49 and the second valve shaft 26 are displaced upward.

  Next, the structure of each part in the valve chamber 17 will be described with reference to FIG. FIG. 3 is an enlarged view of a main part of FIG.

  A stop valve 12 and an adjusting valve 13 are provided inside the strainer 20 in the valve chamber 17. The stop valve 12 includes a stop valve main body 61 formed in a cylindrical shape, and a connection portion fixed to an upper end surface of the stop valve main body 61 via a fastener 62 such as a bolt (not shown in FIG. 2 and FIG. 3). 63. The connecting portion 63 is formed on the side opposite to the contact end of the stop valve body 61 with the valve seat 21 (that is, the front end of the stop valve body 61). The upper end side of the stop valve body 61 is formed thicker as it goes upward. The stop valve 12 is attached to the lower end side of the two second valve shafts 26 via the connection portion 63 on the upper end side of the stop valve main body 61 and can reciprocate in the vertical direction together with the second valve shafts 26. Yes.

  The control valve 13 includes a control valve main body 65 formed in a cylindrical shape, and a joint 66 formed so as to cover the upper part of the control valve main body 65. The adjusting valve main body 65 is disposed inside the stop valve main body 61. The lower end side of the first valve shaft 25 is connected to the joint portion 66, so that the adjusting valve 13 can reciprocate in the vertical direction together with the first valve shaft 25. A through hole 67 through which steam flows is formed on the left side of the first valve shaft 25 in the joint portion 66. The through-hole 67 formed in the joint portion 66 penetrates to the inner peripheral surface of the tubular adjustable valve body 65. On the right side of the first valve shaft 25 in the joint portion 66, a protrusion 68 (first protrusion) that protrudes upward in a rod shape is formed. The protruding portion 68 is slidably inserted into the hole of the steady portion 70 (first steady portion). In addition to obtaining the vibration suppressing effect of the entire control valve 13 by this insertion, when the control valve 13 is operated (vertical movement), the vertical movement of the protrusion 68 and the whole control valve 13 is guided. The steady rest 70 is fixed to the inner peripheral side of a guide 72 described later.

  A cylindrical guide 72 is provided outside the adjusting valve main body 65 and inside the stop valve main body 61, that is, between the stop valve main body 61 and the adjusting valve main body 65. The guide 72 includes a guide main body 74 that extends downward from the lower surface of the lid main body 28, an outer bush 75 that is attached to the outer peripheral side of the guide main body 74, and an inner bush that is attached to the inner peripheral side of the guide main body 74. 76.

  Here, the entire guide 72, the guide main body 74, the outer bush 75, and the inner bush 76 are each formed in a cylindrical shape and disposed on the same central axis C. In addition to these, the stop valve main body 61, the adjusting valve main body 65, the first valve shaft 25, the strainer 20, and the steam outlet 18 are also arranged on the same central axis C.

  The outer diameter of the outer bush 75 is set to be slightly smaller than the inner diameter of the stop valve body 61. The inner diameter of the inner bush 76 is set to be slightly larger than the outer diameter of the adjustable valve main body 65. Accordingly, the outer bush 75 is disposed opposite to the inner surface of the stop valve main body 61 and the inner bush 76 is opposed to the outer surface of the adjusting valve main body 65 with a slight gap therebetween. Two piston rings 78 that come into contact with the inner peripheral surface of the stop valve body 61 are provided on the outer peripheral surface of the outer bush 75, and steam leakage between the stop valve main body 61 and the outer bush 75 is caused by the piston ring 78. It is regulated within a predetermined range. Further, two piston rings 79 that contact the inner peripheral surface of the inner bush 76 are provided on the outer peripheral surface of the adjusting valve main body 65, and steam between the adjusting valve main body 65 and the inner bush 76 is formed by the piston ring 79. Leakage is regulated within a predetermined range.

  Returning to FIG. 2, a guide key 80 (second projecting portion) is provided on the left side in FIG. 2 above the stop valve 12, and the guide key 80 is sandwiched between the stop valve body 61 and the connection portion 63. ing. The guide key 80 extends in the radial direction of the stop valve main body 61, and one end side thereof (the right end side in FIG. 2) projects from the inner peripheral surface of the stop valve main body 61. The protruding portion of the guide key 80 is received in a slot hole 75 a (second steadying portion) formed in the outer bush 75. When the guide key 80 is received in the slot hole 75a, the guide valve 80 and the stop valve 12 are allowed to move in a predetermined range when the stop valve 12 is operated (moved up and down). Rotation in the circumferential direction is restricted.

  Next, detailed shapes of the distal ends (lower ends) of the stop valve main body 61, the adjusting valve main body 65, and the guide portion 72 and the valve seat 21 will be described below with reference to FIG.

  The tip (lower end) of the stop valve body 61 is in contact with the valve seat 21 when the stop valve 12 is closed, thereby blocking the flow of steam. On the other hand, in the valve seat 21, a receiving surface (contact surface) 21b is formed so that a part of the seat portion 21a is recessed in a groove shape in a region where the tip of the stop valve body 61 contacts. The receiving surface 21b is formed along a surface direction substantially orthogonal to the central axis C, that is, a horizontal direction. Since the opening / closing operation direction of the stop valve 12 is the vertical direction, in other words, the direction orthogonal to the receiving surface 21b, the stop valve 12 functions as a poppet valve, and the operation force of the stop valve 12 is reduced. Further, by forming a tapered shape on the outer peripheral side of the distal end of the stop valve body 61 that becomes thinner toward the distal end, a steam flow path can be secured between the strainer 20 and the stop valve body 61.

  The tip of the adjusting valve main body 65 is in contact with the seat portion 21a when the adjusting valve 13 is closed, thereby blocking the flow of steam. The tip of the adjusting valve main body 65 is formed so as to taper while the diameter of the outer peripheral side increases toward the tip. Therefore, by lowering the adjusting valve 13 and bringing the leading end of the adjusting valve main body 65 into pressure contact with the seat portion 21a having a tapered surface, their adhesion is enhanced and the airtightness can be improved.

  A tapered surface is formed on the outer peripheral side of the guide portion 72 so as to become thinner toward the tip. When the stop valve 12 is opened (see FIG. 6), the tapered surface of the distal end of the stop valve main body 65 and the tapered surface of the distal end of the guide 72 are continuously arranged along the same surface. Therefore, it is possible to suppress the occurrence of turbulence in the steam flowing against the tapered surfaces, and to reduce the pressure loss on the distal end sides of the stop valve 12 and the guide 72.

  Here, when both the stop valve 12 and the regulating valve 13 are opened from the closed state, if the pressure difference between the steam inlet portion 16 and the steam outlet portion 18 is large, the operating force for opening the stop valve 12 is extremely large. However, in this embodiment, by optimizing the contact area between the tip of the stop valve body 61 and the receiving surface 21b of the valve seat 21, the double valve structure is not applied to the valve body, and the stop valve 12 The operation force can be reduced. Further, the operating force for opening the regulating valve 13 is excessively large because the pressure above the joint 66 and the inside of the regulating valve body 65 is equalized by the through hole 67 of the regulating valve body 65. Can be avoided.

  Next, the opening / closing operation of the stop valve 12 and the adjusting valve 13 will be described with reference to FIGS. 4 to 7 in addition to FIGS. 4 is an explanatory view showing a state in which the stop valve is opened from the state of FIG. 1, and FIG. 5 is an enlarged view of a main part of FIG. FIG. 6 is an explanatory view showing a state where the valve is opened from the state of FIG. 4, and FIG. 7 is an enlarged view of a main part of FIG.

  As shown in FIG. 1, in order to open the stop valve 12 from a state where both the stop valve 12 and the control valve 13 are closed, high pressure oil is supplied from the outside to the second hydraulic cylinder 47. With this supply, as shown in FIG. 4, when the spring seat 49 and the second cylinder rod 46 rise against the force of the second urging means 50, the other end (left end) of the lever 53 also rises. The connected second valve shaft 26 and stop valve 12 are also raised. As shown in FIGS. 4 and 5, the stop valve 12 is positioned at a position where the outer peripheral surface of the stop valve main body 61 and the outer peripheral surface of the distal end of the guide 72 are tapered. In this state, the stop valve 12 is opened away from the receiving surface 21b while the valve 13 is kept closed, and the steam flow is cut off only by the valve 13.

  In order to open the regulating valve 13 from this state, high pressure oil is supplied from the outside to the first hydraulic cylinder 41. By this supply, as shown in FIG. 6, the first cylinder rod 40 is raised, and the first valve shaft 25 and the regulating valve 13 are raised against the force of the first urging means 42. As a result, as shown in FIGS. 6 and 7, the regulating valve 13 opens away from the seat surface 21 a, and steam flows from the steam inlet portion 16 through the valve chamber 17 to the steam outlet portion 18. Then, by controlling the supply of high-pressure oil to the first hydraulic cylinder 41, the control valve 13 reciprocates in the vertical direction, and by changing the separation distance between the tip of the control valve main body 65 and the seat surface 21a, the steam outlet portion The flow rate of the steam flowing through 18 is controlled.

  Here, in an emergency, etc., the supply of high-pressure oil to the first hydraulic cylinder 41 is interrupted, and the first cylinder rod 40 is lowered by the force of the first biasing means 42 and connected to the first cylinder rod 40. 1 The valve shaft 25 and the adjusting valve 13 are lowered. Similarly, the supply of high-pressure oil to the second hydraulic cylinder 47 is cut off, and the second cylinder rod 46 is lowered by the force of the second urging means 50, and the second valve shaft 26 and the stop valve 12 connected thereto are moved. Descend. As a result, the regulating valve body 65 in the regulating valve 13 is in a closed state in contact with the seat surface 21a, and the shutting valve body 61 in the stop valve 12 is in a closed state in contact with the receiving surface 21b, thereby blocking the steam flow. The

  In addition, in the valve open state of the stop valve 12 shown in FIGS. 4 to 7, the connection portion 63 of the stop valve 12 is disposed so as to be buried above the innermost uppermost position of the steam inlet portion 16, A steam flow path is secured, and pressure loss is reduced by not hindering the steam flow from the steam inlet section 16. That is, the connecting portion 63 is disposed so as to be embedded outside the flow path of the steam flowing into the valve chamber 17 when the stop valve 12 is in the open state.

  As described above, according to the present embodiment, by arranging the adjusting valve main body 65 inside the stop valve main body 61, the adjusting valve main body 65 can be reduced in size (smaller diameter) and the through hole 67 can be formed. The adjustable valve body 65 provided can be applied. Thereby, it is possible to reduce the area in which the pressure acts on the control valve main body 65 by the steam flow from the steam inlet portion 16. As a result, the operating force for opening the control valve 13 can be reduced, the first drive mechanism 38 including the first hydraulic cylinder 41 can be downsized and the structure can be simplified, and the cost increase can be suppressed. Furthermore, although the stop valve body 61 is increased in size (increases in diameter) by disposing the stop valve body 61 on the outside of the adjusting valve body 65, the stop valve does not have to be applied even if the conventional complicated sub-valve structure is applied. The operational force at the time of opening the valve 12 can be reduced and the number of components can be reduced, thereby suppressing an increase in cost.

  In addition, since the regulating valve main body 65 becomes small, the excitation force received by the regulating valve 13 by the steam flow can be suppressed. Further, when the flow rate of the steam is adjusted by the control valve 13, most of the region excluding the lower end (tip) side of the control valve 13 is located inside the guide 72, so that it is difficult to be influenced by the excitation force due to the steam flow. . Thereby, the vibration of the control valve 13 by a steam flow can be suppressed, and it can avoid that the bad influence by a vibration arises in each structure of the integrated composite steam valve 10. FIG.

  Further, since the adjusting valve 13 and the stop valve 12 are provided inside and outside the cylindrical guide 72, the reciprocating operation for opening and closing the adjusting valve 13 and the stop valve 12 can be guided by a single guide 72, thereby simplifying the configuration, and consequently The rectifying effect of the steam flowing in the valve chamber 17 can be obtained. Further, the guide 72 can exert a force to support the force from the radial direction of the control valve 13 and the stop valve 12, and the vibration of the control valve 13 and the stop valve 12 can be better suppressed.

  Moreover, since both the stop valve 12 and the regulating valve 13 are disposed inside the same strainer 20, the strainer 20 is structurally enlarged, but it is possible to provide a large number of through holes in the strainer 20. Therefore, the pressure loss is reduced, the steam passing through the strainer 20 is rectified, and the pressure loss of the valve can also be reduced.

  Further, by installing piston rings 78 and 79 having a self-sealing function (differential pressure sealing function) between the guide 72 and the stop valve main body 61 and between the guide 72 and the adjusting valve main body 65, such installation is performed. The sealing performance at the position can be appropriately maintained over a long period of time.

  In addition, since the single first valve shaft 25 is disposed on the same central axis as the adjusting valve main body 65, the adjusting valve main body 65 can be reciprocated smoothly and smoothly in the vertical direction. In addition, since the first valve shaft 25 is the minimum number, the leakage of steam from the gap between the first valve shaft 25 and the guide bush 29 in an operation in which the valve opening of the adjusting valve main body 65 is intermediate. Can be suppressed.

  Further, since the two second valve shafts 26 are arranged at equal distances on the left and right sides of the first valve shaft 25 and are connected to the stop valve body 61, the operating force when the stop valve 12 is opened increases. Even in such a case, the force can be distributed to the two second valve shafts 26. Moreover, since the stop valve 12 is not fully opened after it is fully opened at the start of operation, the second valve shaft 26 and the guide bush 30 are connected by the back seat of the stop valve body 61 during operation. It is regulated so that there is no steam leakage from the gap.

  In addition, this invention is not limited to the said embodiment, It can implement variously. In the above-described embodiment, the size, shape, direction, and the like illustrated in the accompanying drawings are not limited thereto, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, the guide 72, the stop valve body 61, and the regulator valve body 65 may be formed in a cylindrical shape other than a cylinder. Further, the adjusting valve main body 65 may have a shape other than a cylindrical shape such as a bowl shape. However, it is advantageous that the guide 72, the stop valve main body 61, and the adjusting valve main body 65 are cylindrical in that steam turbulence hardly occurs.

  Further, the number of the second valve shafts 26 is not limited to two, but may be three or more, and each may be arranged at an equal distance from the first valve shaft 25.

  Further, the center of the strainer 20, the valve lid 11, and other components may be decentered with respect to the center of the valve chamber 17.

DESCRIPTION OF SYMBOLS 10 Integrated compound steam valve 11 Valve box 12 Stop valve 13 Adjustable valve 17 Valve chamber 20 Strainer 21 Valve seat 21b Receiving surface (contact surface)
25 First valve shaft 26 Second valve shaft 61 Stop valve main body 63 Connection portion 65 Adjustable valve main body 66 Joint portion 67 Through-hole 68 Protruding portion (first protruding portion)
70 steady rest (first steady rest)
72 Guide 75 Outer bushing 76 Inner bushing 78 Piston ring 79 Piston ring

Claims (12)

In an integrated composite steam valve including a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box,
The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjustment valve includes an adjustment valve body that contacts the valve seat when the valve is closed,
The regulator valve body is disposed inside the stop valve body ;
The upper part of the valve chamber is open, and the valve chamber includes a valve lid that closes the opening,
The control valve has a first protrusion,
The integral lid steam valve , wherein the valve lid has a first steadying portion that guides the first projecting portion when the regulating valve is operated . In an integrated composite steam valve including a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box,
The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjustment valve includes an adjustment valve body that contacts the valve seat when the valve is closed,
The regulator valve body is disposed inside the stop valve body ;
An integrated composite steam valve characterized in that, when the stop valve is closed, a contact surface of the valve seat with the stop valve body is formed along a direction substantially orthogonal to the opening / closing operation direction of the stop valve. .   The cylindrical guide which guides the opening / closing operation | movement of the said stop valve and the said control valve is provided between the said control valve main body and the said stop valve main body. The integrated composite steam valve as described. In an integrated composite steam valve including a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box,
The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjustment valve includes an adjustment valve body that contacts the valve seat when the valve is closed,
The regulator valve body is disposed inside the stop valve body;
Between the control valve main body and the stop valve main body, a cylindrical guide for guiding the opening and closing operation of the stop valve and the control valve is provided,
The check valve, when opening of the valve, integrated with the outer peripheral surface and the outer peripheral surface of the guide on the distal end side of the distal end side of the stop valve body you characterized in that it is positioned so as to be continuous in a series Compound steam valve. In an integrated composite steam valve including a valve box in which a valve chamber is formed and a valve seat is disposed in the valve chamber, and a stop valve and an adjusting valve provided in the same valve box,
The stop valve is formed in a cylindrical shape and includes a stop valve body that contacts the valve seat when the valve is closed, while the adjustment valve includes an adjustment valve body that contacts the valve seat when the valve is closed,
The regulator valve body is disposed inside the stop valve body;
Between the control valve main body and the stop valve main body, a cylindrical guide for guiding the opening and closing operation of the stop valve and the control valve is provided ,
Tapered surfaces are formed on the distal end side of the stop valve body and the distal end side of the guide, respectively, and when the stop valve is opened, the tapered surface of the stop valve body and the tapered surface of the guide are the same surface. integrated composite vapor valve you characterized in that it is disposed along the.   The guide is disposed on the same central axis as the stop valve and the adjusting valve, and is disposed close to the outer bushing disposed opposite to the inner surface of the stop valve main body and the outer surface of the adjusting valve main body. 6. The integrated composite steam valve according to claim 3, further comprising an inner bush arranged opposite to each other.   The piston ring is provided between the guide and the stop valve main body and between the guide and the adjustable valve main body. An integrated composite steam valve as described in 1.   8. The control valve according to claim 3, wherein a region excluding a tip side of the control valve is positioned inside the guide when the flow rate of the steam is adjusted by the control valve. 9. The integrated composite steam valve as described. The stop valve has a second protrusion;
9. The integrated composite according to claim 3, wherein the guide has a second steadying portion for guiding the second projecting portion when the stop valve is operated. Steam valve.   The integrated composite steam valve according to any one of claims 1 to 9, wherein the stop valve and the adjusting valve are disposed inside a strainer provided in the valve chamber. . The adjusting valve is connected to the first valve shaft and is provided so as to be able to reciprocate, while the stop valve is connected to at least two second valve shafts and is provided to be able to reciprocate,
The adjusting valve body and the first valve shaft are disposed on the same central axis, and each of the second valve shafts is disposed at a position equidistant from the first valve shaft,
The stop valve is attached to the second valve shaft via a connection portion formed on the side opposite to the contact end with the valve seat,
The connecting portion, when the open state of the valve, according to claim 1 to claim 10, characterized in that it is arranged so as to bury the outside of the flow path of the steam flowing into the valve chamber The integrated composite steam valve according to any one of the above. The adjusting valve includes a joint portion formed so as to cover an upper portion of the adjusting valve body, and the joint portion has a through-hole penetrating to an inner peripheral surface of the adjusting valve body. The integrated composite steam valve according to any one of claims 1 to 11 .

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