JP5514626B2 - Flow control valve - Google Patents

Description

  The present invention relates to a flow rate adjustment valve that adjusts the opening degree of a fluid flow hole between the needle valve and a valve seat by rotating the needle valve, and can be fixed with a desired opening degree by a lock nut. Is.

  2. Description of the Related Art Conventionally, as a flow rate adjustment valve that enables fine adjustment of the flow rate of a fluid, for example, as described in Patent Document 1, a needle valve that is threadably engaged with a valve body is widely known. By rotating the handle fixed to the upper end of the valve stem of this needle valve that protrudes upward from the main body, the inlet and the outlet provided at the lower part of the valve main body are connected around the circulation hole. The flow hole can be opened and closed by attaching and detaching the needle valve to the valve seat, and the opening degree of the flow hole can be finely adjusted to a desired flow rate.

  Furthermore, a lock nut is screwed into the valve stem portion protruding upward from the valve body. After adjusting the opening of the flow hole by rotating the needle valve as described above, the lock nut is The needle valve is configured to be fixed at the desired opening degree by being crimped to the upper end surface or the like of the main body.

Japanese Patent No. 3475303

  However, according to the flow rate adjusting valve configured as described above, when the needle valve is rotated when adjusting the opening degree of the flow hole, the lock nut screwed into the valve rod of the needle valve is provided by the rotating operation. The more it rotates and moves upward together with the needle valve, the larger the opening of the flow hole, the more the lock nut will be separated upward from the lock nut crimping surface provided at the upper end of the valve body, Therefore, after adjusting the opening of the flow hole, i.e., the flow rate, when the needle valve is fixed with the opening, the lock nut must be rotated many times to the seating surface. There is a problem that a considerable amount of labor is required, and during that time, the needle valve may rotate unexpectedly, resulting in a situation where accurate flow rate adjustment cannot be performed.

  The present invention has been made in view of the above-described problems. The object of the present invention is to hold the lock nut in a predetermined position without turning around even if the needle valve is rotated during flow rate adjustment. It is an object of the present invention to provide a flow control valve that can be adjusted easily and accurately.

  In order to achieve the above object, the flow control valve of the present invention, as described in claim 1, rotates a needle valve that is screwed in a female screw portion provided in the valve body so as to be able to advance and retract in the vertical direction. Thus, the flow rate of the fluid flowing through the flow hole inside the valve seat of the needle valve is adjusted, and the needle valve is fixed by a lock nut screwed into the valve rod of the needle valve protruding from the valve body In this flow control valve, an annular member is projected at the upper end of the valve body so as to surround the upper part of the valve stem of the needle valve protruding from the valve body, and the lock nut is attached to the outer peripheral surface of the annular member The O-ring is in close contact with each other so as to be slidable.

  In the flow rate control valve configured as described above, the invention according to claim 2 is directed downwardly with the inner and outer peripheral wall portions integrally connected between the upper ends around the screw hole screwed to the valve rod of the needle valve. An annular protrusion is formed between the inner and outer peripheral walls of the protrusion, and an O-ring attached to the inner peripheral surface of the outer peripheral wall of the protrusion is formed on the outer peripheral surface of the annular member. It is characterized by being closely slidable.

  Furthermore, in the invention according to claim 3, a gland nut having a short cylinder part integrally provided on the upper surface is attached to the upper end part of the valve main body, and the valve main body together with the gland nut is attached to the panel or the like. A valve mounting nut for mounting is screwed together, and an annular member projects from the upper surface of the valve mounting nut.

  In the invention according to claim 4, the outer peripheral surface of the outer peripheral wall portion of the protrusion of the lock nut is provided with scales at regular intervals in the vertical direction, while the handle attached to the upper end of the valve stem of the needle valve is provided. A scale indicating member for indicating the position of the scale facing the scale on the lower surface side is fixed to the upper end portion of the valve stem integrally with the handle.

  According to the first aspect of the present invention, by turning a needle valve that is screwed in a female thread portion provided in the valve main body so as to be movable back and forth in the vertical direction, the flow hole inside the valve seat of the needle valve is formed. A flow rate adjusting valve configured to adjust a flow rate of a circulating fluid and to fix a needle valve by a lock nut screwed to a valve rod of a needle valve protruding from the valve body, the valve body at the upper end of the valve body An annular member is provided so as to surround the upper part of the valve stem of the needle valve protruding from the needle, and an O-ring is interposed on the opposing surface of the annular member and the lock nut. Even if the valve is rotated, the frictional force between the ring member and the locknut that is slidably contacted via the O-ring is larger than the frictional force due to the threaded engagement between the needle valve and the locknut. With needle valve It can be reliably prevented from being carried around the body, and can be smoothly adjusted so that the desired valve opening is obtained by rotating only the needle valve while holding the lock nut in the unlocked position. .

  Therefore, after slightly rotating the lock nut to unlock the needle valve and adjusting the opening of the needle valve by rotating the needle valve, the lock nut is slightly rotated and fixed in the opposite direction. By doing so, the needle valve can be locked, so that the flow rate can be adjusted easily and accurately.

  Further, according to the invention according to claim 2, the joint structure of the lock nut and the annular member through the O-ring is centered on the screw hole screwed into the valve nut of the needle valve. An O-ring is formed by forming a downward opening protrusion composed of an inner and outer peripheral wall portion integrally connected between the upper ends, and inserting an annular member between the inner and outer peripheral wall portions of the protrusion and mounting it on the inner peripheral surface of the outer peripheral wall portion. Since the ring member fixed to the valve body side is placed between the inner and outer peripheral wall portions of the protrusion formed on the lock nut. A simple structure that allows the lock nut to be smoothly rotated via an O-ring interposed between the opposing surfaces of the lock nut and the annular member can be configured, and the outer peripheral surface of the lock nut can be entirely covered. Locked or locked with an externally exposed structure Turning operation by a wrench or the like can be easily performed at the time of removal.

  According to the invention of claim 3, a gland nut is integrally attached to the upper end portion of the valve main body, and the short cylinder portion is integrally provided on the upper surface, and the valve main body together with the gland nut is paneled on the short cylinder portion. Since the valve mounting nut for mounting on the panel is screwed together, when mounting the flow control valve of the present invention on the panel, after inserting the short cylinder part into the mounting hole provided in the panel, the upper and lower surfaces of this panel Can be easily and firmly attached to the panel by sandwiching the gland nut with the gland nut and the valve mounting nut, and the annular member projects from the upper surface of the valve mounting nut. A simple structure in which the annular member is fixed to the valve body side can be provided.

  According to the invention which concerns on Claim 4, while providing the graduation to the outer peripheral surface of the outer peripheral wall part in the protrusion of the lock nut at regular intervals in the vertical direction, the handle attached to the upper end of the valve stem of the needle valve Since a scale indicating member that indicates the position of the scale opposite to the scale on the lower surface side is fixed to the upper end of the valve stem integrally with the handle, a lock nut is integrally provided on the valve body side. While rotating only the needle valve by operating the handle in a state in which rotation with the needle valve is prevented via the O-ring with respect to the annular member, the scale indicating member is moved to the outer periphery of the outer peripheral wall portion at the protrusion of the lock nut. It can be easily and accurately adjusted to the scale provided on the surface, and can be easily and accurately set so as to obtain a desired flow rate.

The longitudinal cross-sectional front view of the state which closed the flow regulating valve of this invention. The front view which cut through the lower half part of the state which opened the valve. The disassembled perspective view of this invention flow control valve. The perspective view of the state attached to the panel.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a valve body provided with a female thread portion 3 in which a valve rod 2a of a needle valve 2 is screwed up and down in a vertical direction. The valve seat 4 of the needle valve 2 is formed at the lower end of the valve body, and the inlet 12 provided on one side of the valve body 1 through the circular flow hole 11 surrounded by the valve seat 4 is provided on the other side. It communicates with an outlet 13 provided in the section.

  The valve body 1 has a horizontally long cylindrical body portion 1a provided with the inlet 12 and the outlet 13 on both sides, and integrally projects upward from the center of the upper peripheral portion of the body 1a. The female threaded portion 3 reaching the valve seat 4 provided at the central portion of the main body portion 1a from the central portion of the upper end of the cylindrical portion 1b. A packing 14 is formed in the upper end opening of the female thread portion 3 so as to be in close contact with the intermediate outer peripheral portion of the valve stem 2a of the needle valve 2 in the longitudinal direction, and on the outer peripheral surface of the upper end portion of the cylindrical portion 1b. The gland nut 15 is screwed to press the upper end surface of the packing 14 with the lower end surface of the gland nut 15.

  A short cylindrical portion 15a through which the valve stem 2a of the needle valve 2 is inserted is integrally formed on the top surface of the ground nut 15, and the outer peripheral surface of the short cylindrical portion 15a is approximately the same size and shape as the ground nut 15. The valve mounting nut 16 is screwed together, and the panel P is sandwiched from above and below by the valve mounting nut 16 and the ground nut 15 so as to attach the valve to the panel P. . Further, a short cylindrical ring member 5 having a certain height is integrally provided on the upper surface of the valve mounting nut 16.

  The upper part of the valve stem 2a of the needle valve 2 protrudes upward from the short cylindrical part 15a of the ground nut 15 screwed into the cylindrical part 1b of the valve body 1, and the upper end of the upper part of the disc-shaped handle 6 The handle 6 is fixed to the upper end portion of the valve stem 2a by inserting the nut 18 into the upper end threaded portion through the through hole 6a provided in the central portion. An upper end top plate portion 7b of a cylindrical scale indication member 7 having a lower end formed on the scale indication end 7a is brought into close contact with a square hole 7c provided at the center portion of the top plate portion 7b. The scale indicating member 7 is fixed to the valve stem 2a integrally with the handle 6 by the nut 18 in a state of being fitted to the angular shaft portion. The scale indicating member 7 may be fixed directly to the outer peripheral portion of the lower surface of the handle 6 without being attached to the upper end of the valve stem 2a.

  Further, a lock nut 8 is screwed into a threaded portion 2b of the valve stem 2a of the needle valve 2 protruding upward from the short cylindrical portion 15a of the ground nut 15. The lock nut 8 has an outer diameter larger than the outer diameter of the scale indicating member 7, and a gap between the outer peripheral portion and the screw hole 8a screwed into the screw portion 2b of the valve stem 2a. This portion is formed in a projecting portion 9 that is open downward and is composed of inner and outer peripheral wall portions 9a and 9b that are integrally connected by an annular top wall portion 9c with the upper end being centered around the screw hole 8a.

  The height of the protruding portion 9 is slightly smaller than the inner diameter of the scale indicating member 7 in the outer peripheral wall portion 9a of the protruding portion 9 formed shorter than the height (length) of the scale indicating member 7. A circle having a downward opening formed between the opposing surfaces of the inner and outer peripheral wall portions 9a and 9b while the projection 9 is formed in a small diameter and is accommodated in the scale indicating member 7 so as to be relatively projectable downward. A short cylindrical ring member 5 projecting from the upper surface of the valve mounting nut 16 is inserted into the annular space 9d, and the lock is attached to the outer peripheral surface of the annular member 5. An O-ring 10 attached to the lower end portion of the inner peripheral surface of the outer peripheral wall portion 9a of the protrusion 9 in the nut 8 is slidably brought into close contact.

  In addition, a plurality of scales 17 are provided at regular intervals in the vertical direction on the outer peripheral surface of the outer peripheral wall portion 9a of the protrusion 9 in the lock nut 8. The scale designating end 7a of the scale designating member 7 that covers the outer peripheral wall 9a of the section 9 with a gap is combined to adjust the flow rate.

  The flow rate regulating valve configured as described above is attached to the panel P or the like in use. First, the nut 18 screwed into the upper end of the valve stem 2a of the needle valve 2 is removed, and the handle 6 and the scale indicating member 7 fixed to the upper end of the valve stem 2a by the nut 18 are removed. Are sequentially removed, and the lock nut 8 is removed from the valve stem 2a by screwing the threaded portion 2a of the valve stem 2a, and the valve mounting nut 16 is removed following the lock nut 8. In this state, the short cylindrical portion 15a of the ground nut 15 screwed to the cylindrical portion 1b of the valve body 1 is inserted from below into the mounting hole 19 formed in the panel P so as to protrude from the mounting hole 19. In this state, the valve mounting nut 6 is screwed into the short cylindrical portion 15a of the gland nut 15 protruding upward from the mounting hole 19, so that the valve main body 1 is connected with the gland nut 15 and the valve mounting nut 6. Install on panel P.

  Next, the lock nut 8 is mounted on the valve stem 2a by being screwed into the threaded portion 2b of the valve stem 2a protruding upward from the short tube portion 15a of the ground nut 15, and then the scale indicating member 7 is attached to the valve stem. The handle 6 is attached to the upper end portion of the valve stem 2a so as to cover the protrusion 9 of the lock nut 8 by being attached to the upper end portion of the lock nut 8a. Adheres to the upper end of 2a. A pipe is connected to the inflow port 12 and the outflow port 13 of the flow control valve attached in this way.

  As shown in FIG. 1, in the state where the needle valve 2 is seated on the valve seat 4 and the flow hole 11 between the inlet 12 and the outlet 13 is closed, the flow regulating valve The bottom surface around the screw hole 8a of the lock nut 8 screwed to the screw portion 2b is crimped to the upper end surface of the short cylindrical portion 15a of the ground nut 15 to lock the needle valve 2 and the scale indicating member 7 The bottom scale indicating end 7a of the lock nut 8 is in the position indicating the lowest scale 17 of the plurality of scales 17 provided on the outer peripheral surface of the outer peripheral wall portion 9a of the protrusion 9 of the lock nut 8 and is closed. Is shown.

  In order to open the flow control valve, first, from the closed state shown in FIG. 1, the lock nut 8 is screwed away from the threaded portion 2b of the valve stem 2a with a spanner or the like (in FIG. 4, the counterclockwise direction). ) To unlock the needle valve 2. At this time, if the lock nut 8 is rotated by a very slight angle of, for example, 15 degrees or less, the crimping of the ground nut 15 to the short tube portion 15a is released and the needle valve 2 is unlocked. The scale 17 provided on the outer peripheral wall portion 9a of the protrusion 9 of the lock nut 8 hardly changes its position. When the lock nut 8 is rotated, the O-ring 10 attached to the lower end portion of the inner peripheral surface of the outer peripheral wall portion 9a of the projection 9 is locked in close contact with the outer peripheral surface of the annular member 5. The nut 8 is slid in the circumferential direction integrally with the nut 8.

  Thus, after unlocking the needle valve 2 by turning the lock nut 8, the handle 6 is turned counterclockwise to open the valve and adjusted to a predetermined flow rate. That is, when the handle 6 is rotated counterclockwise, the needle valve 2 is rotated integrally with the handle 6 so that the threaded portion 2a is provided in the valve body 1 and the screw hole 8a of the lock nut 8. The conical valve portion at the lower end is moved away from the valve seat 4 and the flow hole 11 is opened to allow fluid to flow from the inlet 12 to the outlet 13 through the circulation hole 11.

  Thus, as the handle 6 is rotated counterclockwise many times, the needle valve 2 gradually moves up, the opening area of the flow hole 11 increases, and the flow rate increases. At this time, since the lock nut 8 is screwed into the threaded portion 2b provided on the valve rod 2a of the needle valve 2 that rotates together with the handle 6, the lock nut 8 rotates along with the rotation of the needle valve 2. An attempt is made to mount the O-ring 10 on the inner peripheral surface of the lower end portion of the outer peripheral wall 9 a of the protrusion 9 of the lock nut 8, and to fix the O-ring 10 to the valve body 1. 16 is in close contact with the outer peripheral surface of the annular member 5 projecting from the upper surface, and the sliding frictional force between the O-ring 10 and the annular member 5 causes the screw hole 8a of the lock nut 8 and the threaded portion of the valve stem 2a. Since it is larger than the screwing frictional force with 2b, the lock nut 8 is held by the annular member 5 without rotating and is maintained in the stop state at the unlocked position.

  Accordingly, the scale indicating member 7 moves upward integrally with the needle valve 2 as the needle valve 2 rotates and retracts with respect to the lock nut 8, and the scale indicating end 7 a is connected to the protrusion 9 of the lock nut 8. When the scale indicating end 7a corresponds to the position of the scale 17 indicating the desired flow rate, the lowermost scale 17 provided on the outer peripheral wall portion 9a is sequentially associated with the upper scale 17, and the handle 6 If the turning operation is stopped, the opening degree of the flow hole 11 by the lower end conical valve portion of the needle valve 2 can be adjusted to a desired flow rate.

  In this state, the needle valve 2 is locked by rotating the lock nut 8 clockwise with a spanner or the like. At this time, the lock nut 8 does not rotate as described above, and maintains the unlocked state rotated by a slight angle from the locked state as described above. The rotation angle is also a slight angle that is the same as the unlocking angle. Therefore, the indication position of the scale 17 by the scale indication end 7a of the scale indication member 7 is held at the adjusted desired flow rate indication position with almost no fluctuation. Can be kept.

  In the above embodiment, the flow rate adjusting portion of the present invention is constituted by the gland nut 15 having the short cylinder portion 15a in the valve body 1 and the valve mounting nut 16 screwed into the short cylinder portion 15a of the gland nut 15. An annular member 5 that is configured to be attached to the panel P or the like and is slidably contacted with the O-ring 10 on the upper surface of the valve mounting nut 16 is projected. The main body 1a of the valve main body 1 may be attached to and supported by a pipe or the like without using the nut 16, and therefore the annular member 5 is a nut that is screwed onto the upper end of the cylindrical portion 1b of the valve main body. A structure protruding from a member or the like may be used.

  The O-ring 10 is attached to the lower end portion of the inner peripheral surface of the outer peripheral wall portion 9a of the protrusion 9 of the lock nut 8 so as to be slidably in close contact with the outer peripheral surface of the annular member 5. The inner peripheral wall portion 9b may be attached to the lower end portion of the outer peripheral surface so as to be slidably in close contact with the inner peripheral surface of the annular member 5. In short, it is screwed to the valve rod 2a of the needle valve 2. The present invention can be satisfied if the structure is such that an O-ring is interposed between the opposed surfaces of the lock nut 8 and the annular member 5 protruding from the upper end of the valve body 1.

1 Valve body 2 Needle valve
2a Valve stem 3 Female thread 4 Valve seat 5 Ring member 6 Handle 7 Scale indicator 8 Lock nut 9 Projection
9a, 9b Inner peripheral wall
10 O-ring
11 Distribution hole
12 Inlet
13 Outflow hole

Claims (4)

  While adjusting the flow rate of the fluid flowing through the flow hole inside the valve seat of the needle valve by rotating the needle valve that is screwed into the female thread portion provided in the valve body so as to be able to advance and retract in the vertical direction, In a flow control valve configured to fix a needle valve by a lock nut screwed to a valve stem of a needle valve protruding from the valve body, an upper end of the valve body protrudes from the valve body at the upper end of the valve body. An annular member is provided so as to surround an upper part, and an O-ring attached to the lock nut is slidably in close contact with an outer peripheral surface of the annular member.   The lock nut is formed with a downward opening protrusion consisting of an inner and outer peripheral wall part integrally connected with the upper end centered around a screw hole screwed into the valve stem of the needle valve. Between the inner and outer peripheral wall parts of this protrusion An annular member is inserted into the outer peripheral wall portion of the projection and an O-ring attached to the outer peripheral surface of the projecting portion is slidably in close contact with the outer peripheral surface of the annular member. The flow control valve described.   A gland nut is integrally attached to the upper end of the valve body, and a short cylinder part is integrally provided on the upper surface, and a valve mounting nut for attaching the valve body to a panel or the like together with the gland nut is screwed onto the short cylinder part. The flow regulating valve according to claim 1 or 2, wherein an annular member is projected on the upper surface of the valve mounting nut.   On the outer peripheral surface of the outer peripheral wall portion of the protrusion of the lock nut, a scale is provided at regular intervals in the vertical direction, while the scale on the lower surface side of the handle attached to the upper end of the valve stem of the needle valve is opposed to the scale. The flow rate adjusting valve according to claim 1 or 2, wherein a scale indicating member for indicating the position of the scale is fixed to an upper end portion of the valve stem integrally with the handle.

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