JP6228152B2 - Manual valve - Google Patents

Description

  The present invention relates to a manual valve that controls a fluid by moving a valve body relative to a valve seat by turning a knob.

  As manual valves for moving the valve element relative to the valve seat by turning the knob and controlling the fluid, for example, there are manual valves 101 and 201 of the following first and second conventional examples (for example, Patent Document 1, Patent Document 2).

15 and 16 are cross-sectional views of the first conventional manual valve 101. FIG. 15 shows the valve closed state, and FIG. 16 shows the valve open state.
As shown in FIG. 15, the manual valve 101 is fixed to the main body 102 including the valve seat 102 c with the cover 105 surrounding the upper rod 104 </ b> A and the lower rod 104 </ b> B of the rod 104, the coil spring 106, and the pressing member 107. Has been. When the valve is closed, the coil spring 106 is compressed between the presser member 107 disposed at the upper end of the cover 105 and the bulging portion 104Aa provided on the upper rod 104A, and the reaction force thereof is bulged 104Aa. Then, the rod 104 and the valve body 103 are urged toward the valve seat 102c. Therefore, a pressing force that presses the valve body 103 against the valve seat 102 c is obtained by the coil spring 106.

  In this state, when the knob 108 that is screwed into the cover 105 via the screw portion 111 is turned, the knob 108 is raised and engaged with the tip locking portion 104Ab of the rod 104 as shown in FIG. Thereafter, when the knob 108 is further rotated, the rod 104 is pulled up to the knob 108 via the tip locking portion 104Ab, and the valve body 103 is separated from the valve seat 102c.

17 and 18 are sectional views of the manual valve 201 of the second conventional example. FIG. 17 shows the valve open state, and FIG. 18 shows the valve closed state.
As shown in FIG. 18, in the manual valve 201, a valve body 204 is accommodated in a valve box 202 having a valve seat 202c. A valve rod 205 is provided integrally with the valve body 204. The valve stem 205 is inserted into the lid body 208 of the cylinder body 206 and is prevented from coming off by a flange 205a. The cylinder body 206 is provided with a valve pressing body 209 that is screwed into the valve box 202. By rotating the valve pressing body 209, the cylinder body 206 moves while rotating in the axial direction. The coil spring 207 is contracted between the flange 205a of the valve stem 205 and the inner wall 207a of the cylinder body 206. When the valve is closed, the reaction force of the coil spring 207 causes the valve body 204 to move toward the valve seat 202c via the valve rod 205. Energize. That is, a pressing force that presses the valve body 204 against the valve seat 202 c is obtained by the coil spring 207.

  When the valve pressing body 209 is rotated from the valve closed state, the cylinder body 206 moves to the opposite side of the valve seat 202c while rotating integrally with the valve pressing body 209 as shown in FIG. When the flange 205a of the valve rod 205 is engaged with the lid body 208, the valve body 204 moves integrally with the cylinder body 206 and is separated from the valve seat 202c. At this time, since the coil spring 207 is accommodated in the cylinder body 206 and the lid body 208, the spring force of the coil spring 207 does not become a load when the valve pressing body 209 is turned.

Japanese Patent Laid-Open No. 10-122380 No. 04-40058

  However, in the manual valve 101 of the first conventional example, when the valve body 103 is moved between the valve closed position and the valve open position, the presser member 107 contacts the cover 105, so that the coil spring 106 is pressed against the presser member 107. And the bulging portion 104Aa are compressed. The reaction force acts on the rod 104, the tip locking portion 104Ab, and the knob 108 via the bulging portion 104Aa. Therefore, when the knob 108 is turned, the reaction force of the coil spring 106 becomes a load, and it is difficult to turn the knob 108.

  In the manual valve 201 of the second conventional example, although the spring force of the coil spring 207 does not become a load when the valve pressing body 209 is rotated, the valve pressing body 209 and the valve stem 205 are separated from each other. The valve body 204 may be pressed against the valve seat 202c and the seal may become unstable.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a manual valve that has good operability and can perform stable sealing.

One embodiment of the present invention has the following configuration.
(1) A valve seat, a valve body that comes into contact with or separates from the valve seat, a cover that houses the valve body, a knob that is screwed into the cover, and the valve body with respect to the valve seat when the valve is closed A manual valve having a coil spring that presses and presses, and is connected to the valve body, is inserted through the cover and the knob, and is held so as to be movable in the axial direction. A rod having an abutting portion in contact with the rod, and the rod protruding to the outside from the knob; and when the valve body is separated from the valve seat, the valve body engages with the knob; Engagement means for releasing the engagement with the knob when abutting against the knob, the cover is open at an end located on the opposite side of the valve seat, and the other end of the coil spring is connected to the knob. The engaging means is in contact with the knob. During the engagement, the overall length of the coil spring is characterized in that it is a constant.

  In the above configuration, when the engaging means provided in the portion protruding from the knob of the rod releases the engagement with the knob, the coil spring is compressed between the knob and the contact portion of the rod, The spring force urges the rod and the valve body in the valve seat direction via the contact portion, and presses the valve body against the valve seat. Therefore, the valve body is not pressed excessively against the valve seat and seals uniformly.

  When opening the valve from this closed state, the knob is rotated in the forward direction. The knob moves in the counter valve seat direction along the cover. Until the engaging means engages with the knob, the coil spring extends according to the movement of the knob while urging the rod and the valve body in the valve seat direction via the contact portion. Therefore, only the knob moves in the counter valve seat direction while the rod stops moving in the axial direction.

  When the knob moves in the counter valve seat direction and engages with the engaging means, the rod moves in the counter valve seat direction integrally with the knob via the engaging means. In this case, since the distance between the knob and the contact portion is constant, the knob pulls up the valve body in the counter valve seat direction via the rod while keeping the total length of the coil spring constant. Separate.

  When closing the valve, the knob is turned in the opposite direction and moved in the valve seat direction. Since the coil spring is disposed in a state of being stretched between the knob and the contact portion, the rod moves in the valve seat direction integrally with the knob in a state where the engaging means is engaged with the knob. Therefore, the distance between the engaging means and the contact portion is constant, and the total length of the coil spring is constant.

  When the valve body comes into contact with the valve seat, the knob moves in the valve seat direction while compressing the coil spring, and the engagement means releases the engagement with the knob. The spring force of the coil spring urges the rod and the valve body in the valve seat direction via the contact portion, and presses the valve body against the valve seat.

  Thus, when the engagement means releases the engagement with the knob, the manual valve rotates the knob with the coil spring compressed between the knob and the contact portion. In this case, a load due to the spring force of the coil spring is applied. On the other hand, in the above configuration, when the engaging means is engaged with the knob, the knob, the rod, and the coil spring move integrally in the axial direction with the coil spring having a constant overall length. No load is applied due to the spring force of the coil spring. Therefore, according to the above configuration, only when the knob starts to be turned from the valve closed state, or when the valve body is pressed against the valve seat by turning the knob, a load is applied to the knob by the coil spring. Since the knob is not loaded with a coil spring, operability is good.

  In the above configuration, since the knob is connected to the valve body via the rod, when the valve is closed by turning the knob, the valve body can be brought into contact with the valve seat with a uniform sealing force in the circumferential direction. Is possible. Therefore, according to the above configuration, stable sealing can be performed.

(2) In the configuration described in (1), the knob has a cup shape opened to one side, and the knob and the cover are provided with a threaded portion on a radially outer side of the coil spring. preferable.

  In the above configuration, since the screw portion provided between the knob and the cover is provided on the radially outer side of the coil spring, the overall height of the manual valve can be reduced.

(3) In the configuration described in (1) or (2), the rod is connected to the valve body, and is arranged to be capable of reciprocating linear movement in the axial direction, and the first rod It is preferable to have a second rod that is rotatably connected about an axis and has the engaging means and the abutting portion, and a rotating means for rotating the knob and the second rod.

  In the said structure, the rod is comprised by the 1st rod and the 2nd rod, and if a knob is turned, a 2nd rod will rotate integrally with a knob via a surrounding means. Since the coil spring is arranged in a state of being stretched between the knob and the contact portion provided on the second rod, the coil spring rotates integrally with the knob and the second rod. Therefore, the load when turning the knob is reduced. On the other hand, the first rod is connected to the valve body and is disposed so as to be capable of reciprocating linear movement in the axial direction. The second rod is connected to the first rod so as to allow rotation about the axis. Therefore, even if the second rod rotates integrally with the knob, the first rod transmits only the axial thrust to the valve body and prevents the valve body from being worn. Therefore, in the said structure, while reducing the load at the time of turning a knob, operativity can be improved, abrasion of a valve body can be suppressed and the stable seal | sticker can be maintained.

(4) In the configuration described in (3), when the second rod rotates with respect to the first rod, the first rod and the second rod are disposed at a portion where they slide and reduce sliding resistance. It is preferable to have a sliding resistance reducing means.

  In the above configuration, when the second rod rotates with respect to the first rod, the sliding resistance is reduced by the sliding resistance reducing means arranged at the portion where the first rod and the second rod are in sliding contact. Therefore, according to the said structure, even when the rod is comprised with the 1st and 2nd rod, the load at the time of turning a knob can be reduced.

(5) In the configuration described in any one of (1) to (4), it is preferable that the valve seat is provided in a straight line and that the valve body is a diaphragm.

  In the above configuration, since the valve is closed by pressing the diaphragm against the valve seat provided in a straight line, the flow path can be shielded while suppressing the overall height.

(6) In the configuration described in any one of (1) to (5), it is preferable to include a lock unit that prevents rotation of the knob.

  According to the above configuration, since the rotation of the knob is blocked by the lock means when the knob is rotated until the arbitrary valve opening is reached, it is possible to prevent the adjusted valve opening from changing.

(7) In the configuration described in any one of (1) to (6), the rod and the valve body are moved to the valve seat side by bringing the knob and the cover into contact with each other when the valve is closed. It is preferable to have a restricting means for restricting.

  In the above configuration, the knob and the cover are brought into contact with each other when the valve is closed, thereby restricting the knob from moving in the valve seat direction and preventing the valve body from being excessively pressed against the valve seat. The rod and disc do not move to the valve seat side. Therefore, according to the above configuration, a stable seal can be maintained for a long time.

(8) In the configuration described in any one of (1) to (7), it is preferable that the cover includes a display unit that displays a valve opening degree from a position of the knob that moves in the axial direction.

  In the above configuration, since the display means displays the valve opening from the position of the knob, the operator can turn the knob while checking the valve opening, and the operability is good.

(9) In the configuration described in any one of (1) to (8), the cover has a breathing hole formed in a radial direction for communicating a spring chamber accommodating the coil spring with outside air. ,
It is preferable that the knob covers the breathing hole from the fully closed state to the fully opened state.

  In the above configuration, the breathing hole provided in the cover is covered by the knob from the fully closed state to the fully open state, so that foreign matter, water, etc. are prevented from entering the spring chamber that houses the coil spring. it can.

  Therefore, according to the said structure, the operability is good and the manual valve which can perform the stable seal | sticker can be provided.

It is a top view of the manual valve concerning a 1st embodiment of the present invention. It is AA sectional drawing of FIG. 1, Comprising: A valve closed state is shown. It is AA sectional drawing of FIG. 1, Comprising: An engagement state is shown. It is AA sectional drawing of FIG. 1, Comprising: A full open state is shown. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a top view of a body. It is a figure explaining a surrounding means. It is the top view which looked at the diaphragm from the pressure receiving surface side. It is DD sectional drawing of the diaphragm shown in FIG. It is a figure which shows the 1st modification of a diaphragm. It is a figure which shows the 2nd modification of a diaphragm. It is the perspective view which looked at the 1st rod from the lower surface side. It is sectional drawing of the manual valve which concerns on 2nd Embodiment of this invention, Comprising: A valve closed state is shown. It is sectional drawing of the manual valve of a 1st prior art example, Comprising: A valve closed state is shown. It is sectional drawing of the manual valve of a 1st prior art example, Comprising: A fully open state is shown. It is sectional drawing of the manual valve of a 2nd prior art example, Comprising: A fully open state is shown. It is sectional drawing of the manual valve of a 2nd prior art example, Comprising: A fully closed state is shown.

  Embodiments of a manual valve according to the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a top view of a manual valve 1 according to the first embodiment of the present invention. 2 to 4 are sectional views taken along line AA in FIG. 1. FIG. 2 shows a valve closed state, FIG. 3 shows an engaged state, and FIG. 4 shows a fully opened state. FIG. 5 is a BB cross-sectional view of FIG. 6 is a cross-sectional view taken along CC of FIG. FIG. 7 is a plan view of the body 2. FIG. 8 is a diagram for explaining the surrounding means. FIG. 9 is a plan view of the diaphragm 4 as seen from the pressure receiving surface side. 10 is a DD cross-sectional view of the diaphragm 4 shown in FIG. FIG. 11 is a view showing a first modification of the diaphragm 4. FIG. 12 is a view showing a second modification of the diaphragm 4. FIG. 13 is a perspective view of the first rod 51 as viewed from the lower surface side.

  As shown in FIG. 2, the manual valve 1 has a cover 3 attached to a body 2 via a diaphragm 4 (an example of a valve body), and a knob 7 is screwed to the cover 3. The body 2 is provided with a valve seat 25 with which the diaphragm 4 abuts or separates. The rod 5 is connected to the diaphragm 4 and is inserted through the cover 3 and the knob 7 so as to be movable in the axial direction. The rod 5 is provided with an engaging means 54 at a tip 52 h protruding from the knob 7, and the engaging means 54 engages with the knob 7, whereby the rod 5 is integrated with the knob 7 in the counter valve seat direction (upper in the drawing). Direction). The coil spring 6 is contracted between the knob 7 and a spring receiver 53 (an example of a contact portion) provided on the rod 5, and constantly urges the diaphragm 4 toward the valve seat 25.

  As shown in FIGS. 1 and 7, the body 2 is formed of a metal material and has a substantially straight tube shape. As shown in FIG. 2, the body 2 has a first port 21, a second port 24, and a straight flow path 29 formed on the same axis, and the outer periphery of both ends where the first and second ports 21, 24 open. Flange 27 and 28 for connecting with other piping are provided. As shown in FIG. 7, the body 2 is integrally provided with a flat fixed plate 26, and an opening 26 b is formed in the fixed plate 26 in a circular shape so as to communicate with the linear flow path 29. As shown in FIGS. 2 and 5, the valve seat 25 is linearly provided at a position corresponding to the opening 26 b so as to be orthogonal to the axis X of the linear flow path 29. As shown in FIGS. 5 and 6, the valve seat surface 25 a of the valve seat 25 is formed to be curved in an arc shape toward the side opposite to the cover 3, while suppressing the overall height of the body 2, that is, the manual valve 1. A flow path is secured. As shown in FIGS. 2 and 5, the body 2 is configured by fastening a fixing bolt (not shown) inserted through the cover 3 and the diaphragm 4 into a bolt hole 26 a (see FIG. 7) of the fixing plate 26. The diaphragm 4 is airtightly held between the cover 3 and the opening 26 b is covered with the diaphragm 4.

  As shown in FIG. 9, the diaphragm 4 has a shape corresponding to the fixing plate 26, and an insertion hole 4 a through which a fixing bolt (not shown) is inserted is formed. As shown in FIG. 10, the diaphragm 4 includes a film part 41 and a locking part 42. The locking portion 42 is formed by forming a rigid material (metal or resin) or the like into a substantially H shape, and the hooking portion 42a and the mounting portion 42c are connected via the connecting portion 42b. As shown in FIGS. 9 and 10, the film part 41 includes a circular elastic deformation part 41a and a sandwiched part 41c provided along the outer edge of the elastic deformation part 41a. The elastic deformation portion 41a is provided with a linearly projecting seal portion 41b that seals the valve seat surface 25a. The diaphragm 4 is provided with a thick portion 41d to which the mounting portion 42c of the locking portion 42 is mounted on the end surface located opposite to the end surface where the seal portion 41b is provided.

  As shown in FIG. 10, the film portion 41 is formed by forming a fluororesin into a thin film shape, and is opposite to the liquid contact surface of the first film portion 41B constituting the liquid contact surface and the first film portion 41B. The second film portion 41A, which is disposed on the side and formed of a rubber elastic material, is integrally provided by adhesion or the like. In the diaphragm 4 shown in FIG. 10, the first film part 41B is formed thinner than the second film part 41A. However, as shown in FIG. 11, the first film part 41B may be thicker than the second film part 41A. Alternatively, as shown in FIG. 12, the first and second film portions 41B and 41A may have the same thickness. Furthermore, the first and second film portions 41B and 41A may be simply stacked without bonding.

  As shown in FIG. 2, in the diaphragm 4, the sandwiched portion 41c is sandwiched between the body 2 and the cover 3, and the elastic deformation portion 41a covers the opening 26b. At this time, the second film part 41A is elastically deformed to ensure airtightness. Further, since the first film part 41B is made of fluororesin, it is difficult for dirt to adhere to it.

  As shown in FIGS. 2 and 5, the cover 3 has a cylindrical shape. The cover 3 includes an insertion portion 31 that is inserted into the knob 7. The insertion portion 31 is provided with a smaller diameter than the cover 3, and the cover 3 includes a stepped portion 3 a at a portion located on the body 2 side of the insertion portion 31. The knob 7 has a cup shape opened to one side, and is screwed into the cover 3 so as to be covered with the insertion portion 31. The cover 3 is formed with a male screw 31 a on the outer peripheral surface of the insertion portion 31, and the knob 7 is formed with a female screw 71 b that engages with the male screw 31 a on the inner peripheral surface of the opening portion 71. A part 8 is provided. The knob 7 moves in the axial direction (vertical direction in the figure) with respect to the cover 3 by the screw feed of the screw portion 8.

  The cover 3 is provided with a spring chamber 36, a holding hole 34, and a loading hole 33 on the same axis. The rod 5 is inserted through the loading hole 33, the holding hole 34, and the spring chamber 36 of the cover 3, and is further inserted through the knob 7. The rod 5 includes a first rod 51 and a second rod 52. The first rod 51 is connected to the diaphragm 4 and is slidably loaded into the loading hole 33. The second rod 52 is connected to the first rod 51 so as to be rotatable about an axis, is inserted into the spring chamber 36 from the holding hole 34, and a tip end portion 52 h (upper end portion in the figure) projects from the knob 7. The rod 5 is provided with an engaging means 54 at the tip 52 h of the second rod 52. The rod 5 is provided with a spring receiver 53 (an example of an abutting portion) that abuts on the coil spring 6 on the second rod 52.

  The second rod 52 includes a large-diameter portion 52a that is inserted into the holding hole 34 so as to be rotatable and slidable. The spring receiver 53 has a ring shape and is inserted into the second rod 52 from the end located on the side opposite to the valve seat of the second rod 52 and is abutted against the stepped portion 52b formed by the large diameter portion 52a. Is held by. The cover 3 has a spring chamber 36 having a diameter larger than that of the holding hole 34 from an end surface (upper end surface in the drawing) located on the knob 7 side, and accommodates the coil spring 6. The coil spring 6 has a bottom 71a and a spring receiver in a state where the lower end 6b in the drawing is in contact with the spring receiver 53 and the upper end 6a in the drawing is in contact with the bottom 71a of the opening 71 provided in the knob 7. 53. The coil spring 6 is provided so as to be slightly compressed when the engaging means 54 and the knob 7 are engaged.

  As shown in FIGS. 2 to 4, in the rod 5, the tip 52 h of the second rod 52 protrudes from the knob 7 from the valve closed state to the valve open state. The second rod 52 is formed with a screw hole 52d for attaching an engaging means 54 (screw in this embodiment) on the end face on the tip end 52h side, and the engaging means 54 is detachably attached. The knob 7 is provided with a storage recess 73 for storing the engaging means 54 so that the engaging means 54 protrudes from the knob 7 and does not get in the way when the valve is closed. The knob 7 is provided with a stopper 74 between the opening 71 and the housing recess 73 for engaging with the engaging means 54.

  As shown in FIG. 8, two-surface width surfaces 52 e and 72 a are formed on the outer surface of the tip 52 h of the second rod 52 and the inner surface of the through hole 72. Therefore, the second rod 52 is held at the front end portion and the rear end portion in the through hole 72 of the knob 7 and the holding hole 34 of the cover 3, and moves stably in the axial direction. Further, the second rod 52 rotates with the knob 7. In the present embodiment, the “surrounding means” is configured by the two-surface width surfaces 52e and 72a.

  In the second rod 52, a connecting portion 52 c provided at an end portion (lower end portion in the figure) located on the body 2 side is rotatably fitted in an engaging groove 51 d formed in the first rod 51. A sliding ring 10 (sliding resistance reducing means) is provided between an end surface (lower surface in the drawing) located on the body 2 side of the coupling portion 52c and an inner wall (bottom surface in the drawing) 51dx located on the body 2 side of the engaging groove 51d. ), And the sliding resistance when the second rod 52 rotates relative to the first rod 51 is reduced.

  The first rod 51 has a guide groove 35 projecting along the axial direction on the inner peripheral surface of the loading hole 33 provided in the cover 3 in a guide groove 51f formed along the axial direction with respect to the outer peripheral surface. Are fitted on the cover 3 so as to be capable of reciprocating linear movement along the axial direction. In the first rod 51, the thick portion 41d of the diaphragm 4 is fitted into the positioning recess 51a, and the hooking portion 42a of the diaphragm 4 is disposed in the fitting recess 51c. The first rod 51 has a diaphragm 4 in a state in which a small-diameter portion 51e provided between the positioning recess 51a and the fitting recess 51c is disposed with almost no gap in the axial direction between the thick portion 41d and the hooking portion 42a. To the diaphragm 4 to apply axial thrust.

  As shown in FIG. 13, the first rod 51 is provided with a pressing portion 51g for pressing the seal portion 41b of the diaphragm 4 against the valve seat surface 25a on the end surface located on the diaphragm 4 side, thereby providing a stable seal. Can be done.

  As shown in FIG. 2, an O-ring 9 is disposed between the inner peripheral surface of the opening 71 provided in the knob 7 and the outer peripheral surface of the insertion portion 31 provided in the cover 3. When rotating with respect to the cover 3, resistance is generated. This is to prevent the knob 7 from being accidentally rotated with respect to the cover 3.

  Further, as shown in FIG. 2, the cover 3 is formed with a breathing hole 32 in the radial direction with respect to the insertion portion 31 for allowing the spring chamber 36 to communicate with the atmosphere. The breathing hole 32 is provided on the body 2 side of the O-ring 9 and at a position covered with the knob 7 from the valve closed state to the fully opened state. This is to prevent water, dust and the like from entering the spring chamber 36 through the breathing hole 32.

Next, operation | movement of the manual valve 1 of this embodiment is demonstrated.
As shown in FIGS. 2 and 5, in the manual valve 1, the engagement means 54 provided at the portion (tip portion 52 h) where the rod 5 protrudes from the knob 7 is separated from the stopper 74 and engaged with the knob 7. Is released, the coil spring 6 is compressed between the bottom 71 a of the knob 7 and the spring receiver 53, and the spring force is transmitted through the spring receiver 53 to the second rod 52, the first rod 51, and the diaphragm 4. Is urged toward the valve seat 25 to press the diaphragm 4 against the valve seat 25. Therefore, the diaphragm 4 is not excessively pressed against the valve seat 25, and the seal portion 41b is uniformly sealed to the valve seat surface 25a.

  When opening the valve, the knob 7 is rotated in the forward direction. Then, the knob 7 is moved in the direction opposite to the valve seat 25 (counter valve seat direction, upward in the figure) along the cover 3 by the screw feed of the screw portion 8. Until the engaging means 54 engages with the knob 7, the coil spring 6 extends according to the movement of the knob 7 while urging the rod 5 and the diaphragm 4 toward the valve seat 25 via the spring receiver 53. Therefore, only the knob 7 moves in the counter valve seat direction while the rod 5 stops moving in the axial direction.

  As shown in FIG. 3, when the knob 7 is moved in the counter valve seat direction and the stopper 74 is engaged with the engaging means 54, the rod 5 is engaged with the engaging means 54 as shown in FIGS. 4 and 6. Is lifted up to the knob 7 through and moved together with the knob 7 in the counter valve seat direction. In this case, since the distance between the engaging means 54 and the spring receiver 53 is constant, the knob 7 moves the diaphragm 4 via the rod 5 against the valve seat while keeping the total length L2 of the coil spring 6 constant. Pull up in the direction and move away from the valve seat 25.

  When closing the valve, the knob 7 is rotated in the reverse direction and moved in the direction of the valve seat 25. Since the coil spring 6 is disposed in a state of being stretched between the knob 7 and the spring receiver 53, the rod 5 is in a state where the engaging means 54 is brought into contact with the stopper 74 and engaged with the knob 7. And move in the direction of the valve seat 25 integrally. Therefore, the distance between the engaging means 54 and the spring receiver 53 is constant, and the total length L2 of the coil spring 6 is constant.

  When the diaphragm 4 comes into contact with the valve seat 25, the knob 7 moves toward the valve seat 25 while compressing the coil spring 6, and the engaging means 54 releases the engagement with the knob 7. The spring force of the coil spring 6 urges the rod 5 and the diaphragm 4 toward the valve seat 25 via the spring receiver 53 and presses the diaphragm 4 against the valve seat 25. In the manual valve 1, when the bottom portion 71a of the knob 7 comes into contact with the end portion 31b located on the counter valve seat side of the cover 3, the knob 7 cannot move further in the direction of the valve seat 25. Therefore, in the manual valve 1, the knob 7 is turned too far in the reverse direction, and the resin-made first film portion 41B constituting the diaphragm 4 is excessively pressed against the metal valve seat 25 that is harder than the first film portion 41B. And will not be deformed. Thereby, the manual valve 1 can maintain a stable seal for a long time.

  As described above, when the engaging means 54 releases the engagement with the knob 7, the manual valve 1 rotates the knob 7 in a state where the coil spring 6 is compressed between the knob 7 and the spring receiver 53. Therefore, when the knob 7 is turned, a load due to the spring force of the coil spring 6 is applied. On the other hand, when the engaging means 54 engages with the knob 7, the manual valve 1 is configured such that the knob 7, the rod 5, and the coil spring 6 are integrally formed in the axial direction with the entire length L 2 of the coil spring 6 being constant. Therefore, when the knob 7 is turned, a load due to the spring force of the coil spring 6 is not applied. Therefore, the manual valve 1 is loaded with the coil spring 6 only when the knob 7 starts to be turned from the closed state or when the knob 7 is turned to press the diaphragm 4 against the valve seat 25. In other cases, the knob 7 is not loaded with the coil spring 6, so that the operability is good.

  Further, in the manual valve 1, since the rod 5 is inserted through the cover 3 and the knob 7 and is held in the axial direction, the rod 5 moves stably in the axial direction during the valve opening / closing operation. Therefore, when the valve is closed, the diaphragm 4 can be uniformly sealed to the valve seat 25, and stable sealing can be performed.

  Here, in the manual valve 1, the rod 5 is composed of the first rod 51 and the second rod 52, and when the knob 7 is turned, the second rod 52 becomes the two-surface width surfaces 52 e and 72 a (an example of the rotating means). And rotate together with the knob 7. Since the coil spring 6 is disposed in a state of being stretched between the knob 7 and the spring receiver 53 provided on the second rod 52, the coil spring 6 rotates integrally with the knob 7 and the second rod 52. Therefore, the load when turning the knob 7 is reduced. On the other hand, the first rod 51 is connected to the diaphragm 4 and is disposed so as to be capable of reciprocating linear movement in the axial direction by fitting the guide portion 35 into the guide groove 51f. The second rod 52 is connected to the first rod 51 so as to allow rotation about the axis. Therefore, even if the 2nd rod 52 rotates integrally with the knob 7, the 1st rod 51 transmits only the thrust of an axial direction to the diaphragm 4, and the diaphragm 4 (2nd film | membrane part which consists of elastic materials, such as rubber | gum) 41A) wear is prevented. Therefore, in the manual valve 1, the operability can be improved by reducing the load when the knob 7 is turned, and the wear of the diaphragm 4 can be suppressed and a stable seal can be maintained. Further, since the first rod 51 moves only in the axial direction, the manual valve 1 can perform the valve opening / closing operation in a state where the seal portion 41b of the diaphragm 4 is positioned with respect to the valve seat surface 25a of the valve seat 25. .

  In the manual valve 1, the end surface of the second rod 52 located on the valve seat 25 side is pressed against the inner wall 51 dx of the first rod 51 by the spring force of the coil spring 6, and the sliding resistance generated at the contact portion is controlled by the knob 7. It may become a load when turning. However, since the sliding ring 10 is disposed between the end surface of the second rod 52 located on the valve seat 25 side and the inner wall 51dx, the manual valve 1 has the second rod 52 with respect to the first rod 51. The sliding resistance that occurs when the motor rotates is reduced. Therefore, the manual valve 1 includes the first rod 51 provided so that the rod 5 is movable in the axial direction and the second rod 52 provided so as to be movable and rotatable in the axial direction. The load when the knob 7 is turned can be reduced.

  By the way, although the manual valve 1 adjusts the valve opening degree by turning the knob 7, it is preferable that the operator can confirm the valve opening degree when the flow rate is adjusted. Therefore, the manual valve 1 according to the present embodiment is provided with a memory (an example of a display unit) indicating the valve opening degree along the axial direction on the outer peripheral surface of the cover 3. The valve opening is made visible from the relationship. According to this, the operator can turn the knob 7 while confirming the valve opening, and the operability is good.

  The manual valve 1 presses the diaphragm 4 against the valve seat 25 that is provided in a straight line so as to be orthogonal to the straight flow path 29 that connects the first port 21 and the second port 24. Since the valve is closed, the flow path can be shielded while suppressing the overall height.

  Further, the manual valve 1 is provided with the threaded portion 8 on the radially outer side with respect to the coil spring 6, so that the overall height can be lowered.

  Since the manual valve 1 is covered with the knob 7 in the breathing hole 32 provided in the cover 3 from the fully closed state shown in FIG. 2 to the fully opened state shown in FIG. Or the like can be prevented from entering the spring chamber 36 that houses the coil spring 6.

  The said manual valve 1 is arrange | positioned at the piping through which the raw material of a pharmaceutical manufacturing line flows, for example. In the pharmaceutical production line, piping is periodically sterilized from the viewpoint of hygiene. If the entire line is stopped and sterilization is performed, the production efficiency decreases. Therefore, sterilization is performed for every fixed section. The manual valve 1 is used to divide the section. For example, the manual valve 1 is normally opened to flow the raw material through the line. When sterilization is performed, the operator closes the manual valve 1 appropriately to divide a section to be sterilized, and performs sterilization by flowing steam, a cleaning solution, or the like through the section. When the sterilization is completed, the closed manual valve 1 is returned to the valve open state. The operator performs sterilization of another area in the same manner. Since the manual valve 1 has good operability and a stable seal, an operator can efficiently perform sterilization work.

(Second Embodiment)
Subsequently, a manual valve according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 14 is a cross-sectional view of the manual valve 11 according to the second embodiment of the present invention, showing the valve closed state. The manual valve 11 has a male screw part 12a of the cover 12 that is longer in the axial direction than the male screw part 31a of the first embodiment, and the lock nut 13 is screwed into the male screw part 12a. Unlike the valve 1, the other points are the same as the manual valve 1.

  For example, when the manual valve 11 is adjusted to a desired valve opening degree by turning the knob 7, the lock valve 13 is turned to open the opening end of the knob 7 in addition to the effects of the manual valve 1 of the first embodiment. If it arrange | positions so that it may contact | abut to a part, rotation of the knob 7 is blocked | prevented. Therefore, according to the manual valve 11, it can prevent that the knob 7 is accidentally turned and the adjusted valve opening degree changes.

In addition, this invention is not limited to the said embodiment, Various application is possible.
(1) For example, you may use the manual valves 1 and 11 of the said embodiment for flow control of liquids, such as water and a washing | cleaning liquid other than gas, such as a vapor | steam.
(2) For example, in the above embodiment, in order to restrict the lowering of the knob and stop the valve closing operation, the upper wall of the knob is abutted against the upper edge of the cover. It is good also as a structure which abuts against this level | step-difference part 3a.
(3) In the above embodiment, the rotating means is constituted by the two-surface width surfaces 52e and 72a. For example, the tip 52h of the second rod 52 and the through hole 72 of the knob 7 are formed in a polygonal shape. Means "may be configured. Further, for example, the turning means may be configured by forming a groove along the axial direction on the outer peripheral surface of the second rod 52 and slidably fitting a pin disposed in the radial direction of the knob 7 into the groove. good.
(4) The valve structure of the manual valves 1 and 11 may be a poppet valve structure.
(5) For example, the first rod 51 may have a shape in which the pressing portion 51g is omitted.
(6) In the above embodiment, the first and second ports 21 and 24 are arranged in the same straight line. For example, the second port 24 is provided below the first port 21, and the valve seat 25 and the second port 24 are provided. May be connected by an oblique flow path.
(7) For example, the body 2 may be formed of a material other than a metal such as a fluororesin. For example, even when the body 2 is formed of a fluororesin, when the knob 7 is turned in the reverse direction to close the valve, the movement of the knob 7 in the direction of the valve seat 25 is restricted by contacting the cover 3. The knob 7 is not turned too much and the diaphragm 4 is excessively pressed against the valve seat, so that the diaphragm 4 and the valve seat are not deformed.
(8) Further, for example, instead of the flanges 27 and 28, the body 2 may be provided with connection portions connected to other pipes by insertion or screwing at both ends. Further, for example, the body 2 may be connected to other piping by welding or the like without the flanges 27 and 28.

1,11 Manual valve 3,12 Cover 13 Lock nut (an example of locking means)
4 Diaphragm (example of valve body)
5 Rod 6 Coil spring 7 Knob 10 Sliding ring (an example of means for reducing sliding resistance)
25 Valve seat 29 Straight flow path 32 Breathing hole 41b Seal part 51 1st rod 52 2nd rod 53 Spring support (an example of contact part)
54 Engagement means 52e, 72a Width across flats (an example of a turning means)
31b end (an example of a limiting means)
71a bottom (an example of a limiting means)

Claims (9)

A valve seat, a valve body that contacts or separates from the valve seat, a cover that accommodates the valve body, a knob that is screwed into the cover, and presses the valve body against the valve seat when the valve is closed. In a manual valve comprising a coil spring,
A rod connected to the valve body, inserted through the cover and the knob, and held so as to be movable in the axial direction; and a rod having an abutting portion that abuts against one end of the coil spring;
The rod is provided at a portion projecting outward from the knob, and engages with the knob when the valve body is separated from the valve seat, and with the knob when the valve body abuts on the valve seat. Engaging means for releasing the engagement;
The cover has an end located on the side opposite to the valve seat, and the other end of the coil spring is in contact with the knob. While the engaging means is engaged with the knob, the coil A manual valve characterized in that the total length of the spring is constant. The manual valve according to claim 1,
The knob has a cup shape opening to one side;
The manual valve according to claim 1, wherein the knob and the cover are provided with a threaded portion on a radially outer side of the coil spring. In the manual valve according to claim 1 or 2,
The rod is connected to the valve body, and is connected to the first rod arranged so as to be capable of reciprocating linear movement in the axial direction. The rod is connected to the first rod so as to be rotatable about an axis. Having a second rod having a contact portion;
A manual valve having a turning means for turning the knob and the second rod. The manual valve according to claim 3,
When the second rod rotates with respect to the first rod, the first rod and the second rod are arranged in a sliding contact portion, and have sliding resistance reducing means for reducing sliding resistance. Manual valve. The manual valve according to any one of claims 1 to 4,
The valve seat is provided in a straight line;
A manual valve characterized in that the valve body is a diaphragm. The manual valve according to any one of claims 1 to 5,
A manual valve having locking means for preventing rotation of the knob. The manual valve according to any one of claims 1 to 6,
A manual valve comprising: a restricting means for restricting movement of the rod and the valve body toward the valve seat by bringing the knob and the cover into contact with each other when the valve is closed. The manual valve according to any one of claims 1 to 7,
The manual valve according to claim 1, wherein the cover includes display means for displaying a valve opening degree from a position of the knob that moves in the axial direction. The manual valve according to any one of claims 1 to 8,
The cover has a breathing hole formed in a radial direction for communicating a spring chamber accommodating the coil spring with outside air;
The manual valve characterized in that the knob covers the breathing hole from a fully closed state to a fully open state.

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