KR101448429B1

KR101448429B1 - Cylinder loaded type opening and shutting valve

Info

Publication number: KR101448429B1
Application number: KR1020140056275A
Authority: KR
Inventors: 유복화
Original assignee: 케이알이피에스 주식회사
Priority date: 2014-05-12
Filing date: 2014-05-12
Publication date: 2014-10-10

Abstract

The present invention relates to a cylinder-operated on-off valve capable of ensuring a fast opening and closing speed while opening and closing a high-pressure flow path with a small force, and is provided with a cylinder-operated opening / closing valve that communicates with an inflow- A stem case coupled to an upper portion of the valve body and having a hollow inside and having a lower end vertically movably installed inside the stem case and having a lower end penetrating the upper portion of the valve body, A valve stem extending up to a valve seat of the main body and having an upper end protruding upward from the stem case; a valve member coupled to a lower end of the valve stem, And the other end of the stem is connected to the upper end of the valve stem, and the fulcrum of the rotation center is connected to the action point And a double-acting cylinder for moving the cylinder rod up and down, a cylinder rod connected to a point of force of the rotary lever for rotating the rotary lever in normal and reverse directions with respect to the fulcrum while being raised and lowered.

Description

CYLINDER LOADED TYPE OPENING AND SHUTTING VALVE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cylinder-operated on-off valve that opens and closes to easily connect and disconnect a high-pressure flow path according to the operation of a cylinder.

In general, valve is a device to control and shut off the flow of fluid. It is divided into application, standard, material and structure. It is used as various important parts throughout the industry from small home valve to petrochemical, refinery, There are large industrial valves used.

Among these valves, valves capable of implementing an opening and closing function of connecting and disconnecting the flow path are mainly a rotary ball opening / closing valve and a cylinder operation opening / closing valve.

The rotary ball opening / closing valve controls the flow of the fluid while the flow path of the valve is opened and closed by the operating means provided at one side of the valve body. That is, a spherical ball is provided inside the valve seat of the valve body, and the ball is configured to open and close the flow path of the valve seat while being rotated by the operating means. Such a rotary ball opening / closing valve is capable of rotating the ball even with a small force even when the pressure in the flow passage is in a high pressure state, thereby facilitating opening and closing. On the other hand, since the contact surface between the valve seat of the valve body and the ball, The failure rate is high and the ball having high frictional resistance has to be rotated, so that the opening and closing speed of the valve is inevitably slowed down.

On the other hand, the cylinder-operated on-off valve opens and closes the oil passage while the cylinder rod moves forward and backward by the operation of the direct-acting cylinder provided on one side of the valve body. That is, the disk coupled to the end of the cylinder rod opens and closes the valve seat of the valve body according to the forward and backward movement of the cylinder rod. This cylinder-operated opening / closing valve is advantageous in that the frictional resistance is small and the opening / closing speed is very fast because the contact surface between the valve seat and the disk is smaller than the rotary ball opening / closing valve. However, The required pressure of the direct-acting cylinder is increased in proportion to the pressure in the flow passage.

Accordingly, unlike a rotary ball opening / closing valve, a cylinder-operated opening / closing valve is inevitably required to have a low failure occurrence rate and a high durability while achieving a fast opening and closing speed. In this case, An actuating opening and closing valve is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder-operated opening / closing valve capable of ensuring a fast opening / closing speed while opening / closing a high-pressure flow passage with a small force.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to achieve the above-mentioned object, a first embodiment of a cylinder-operated on-off valve according to the present invention comprises a valve body having a valve seat communicated from an inflow passage formed at a lower portion to an outflow passage formed at a side, A stem case coupled to an upper portion of the valve body so as to be vertically movable up and down inside the stem case and having a lower end penetrating the upper portion of the valve body to be positioned inside the valve body, A valve stem of which the upper end protrudes above the stem case; a disk coupled to the lower end of the valve stem and vertically moving up and down together with the valve stem to open and close the valve seat of the valve body; A rotation lever connected to an upper end of the valve stem and having a fulcrum of a rotation center provided closer to the action point than a force point of the other end; While connected to the lifting of himjeom comprises a cylinder rod with normal and reverse rotation of the rotating lever with respect to the support point, double-acting cylinder for lifting the operating rod of the cylinder.

The operation lever is rotatably coupled with the action point of the rotary lever as a center of rotation and is rotatably coupled with one end of the action transmission wheel pin-engaged with the upper end of the valve stem, And a force transmission wheel in which one side of the outer periphery is pin-coupled with the cylinder rod.

The second embodiment of the cylinder-operated on-off valve according to the present invention comprises a valve body communicating from an inflow passage formed at a lower portion to an outflow passage formed at a side surface thereof and having a valve seat formed in the inflow passage, A stem case coupled to an upper portion of the valve body, and a valve member disposed vertically movably in the stem case and having a lower end penetrating the upper portion of the valve body and positioned inside the valve body, A valve stem protruded upward from the case; a valve stem coupled to a lower end of the valve stem, the valve seat of the valve body being closed when the valve stem is lifted upward and downward together with the valve stem, Wherein the valve stem is provided in the stem case with a disc, A rotary lever having a working point at one end connected to the upper end of the valve stem and a fulcrum at which the center of rotation is located closer to the point of action than a point of force at the other end; A cylinder rod for rotating the rotary lever in normal and reverse directions with respect to the fulcrum; and a single acting cylinder for raising and lowering the cylinder rod in a direction of lowering the disk to open the valve seat.

And an outer peripheral surface of the action transmission wheel is engaged with a force point of the rotary lever as a center of circle, and an outer peripheral surface of the action transmission wheel is in contact with the cylinder rod Further comprising a force transmission wheel.

The apparatus may further include a cylinder return spring installed inside the single acting cylinder to provide a spring force to the cylinder rod in a direction in which the cylinder rod descends.

The cylinder actuating opening / closing valve according to the present invention can be easily opened / closed by opening / closing a high-pressure flow path on the disk as the valve stem is lifted or lowered by a small force of the cylinder rod operated by the cylinder using the leverage principle of the rotary lever, .

In addition, the working points and the force points of the rotating lever, which are respectively connected to the cylinder rod reciprocatingly lifting and straightening in a straight line and the valve stem, respectively, have respective turning radii, which can be structurally and easily connected between the action transmitting wheel and the force transmitting wheel You can reduce the waste of power and increase your calendar.

In particular, it is possible to divide embodiments so that the double acting cylinder and the single acting cylinder can be used as the cylinder, and in the case of the double acting cylinder, it is possible to apply the force regardless of the direction of opening and closing the disk, In the case of a single acting cylinder, it can be used only when it is not necessary to waste force in a direction opposite to the set direction since it can exert force only on one direction of opening or closing of the disk.

1 is a side sectional view showing a first embodiment of a cylinder actuating opening / closing valve according to the present invention,
Fig. 2 is a cross-sectional view of the recessed portion of the embodiment of Fig. 1 showing the rotation lever,
FIG. 3 is a side sectional view showing a state in which the valve seat is opened in the embodiment of FIG. 1,
Fig. 4 is a cross-sectional view of a recessed portion of the embodiment of Fig. 3 showing the operation of the rotary lever,
5 is a side sectional view showing a state in which the valve seat is closed in the embodiment of Fig. 3,
Fig. 6 is a cross-sectional view of the recessed portion of the embodiment of Fig. 5 showing the operation of the rotary lever,
7 is a side sectional view showing a second embodiment of the cylinder actuating opening / closing valve according to the present invention,
Fig. 8 is a side sectional view showing the rotation lever of the embodiment of Fig. 7,
FIG. 9 is a side sectional view showing a state in which the valve seat is opened in the embodiment of FIG. 7,
Fig. 10 is a cross-sectional view of the recessed portion of the embodiment of Fig. 9 showing the operation of the rotary lever,
Fig. 11 is a side sectional view showing a state in which the valve seat is closed in the embodiment of Fig. 9,
Fig. 12 is a cross-sectional view of the recessed portion of the embodiment of Fig. 11 showing the operation of the rotary lever,
13 is a side cross-sectional view showing a third embodiment of the cylinder actuating opening / closing valve according to the present invention,
Fig. 14 is a cross-sectional view of the recessed portion of the embodiment of Fig. 13 showing the rotation lever,
Fig. 15 is a side sectional view showing a state in which the valve seat is opened in the embodiment of Fig. 13,
Fig. 16 is a cross-sectional view of the recessed portion of the embodiment of Fig. 15 showing the operation of the rotary lever,
17 is a side cross-sectional view showing the state in which the valve seat is closed in the embodiment of Fig. 15,
18 is a cross-sectional view of the recessed portion illustrating the operation of the rotary lever in the embodiment of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a cylinder-operated opening / closing valve according to the present invention will be described in detail with reference to the accompanying drawings.

The first embodiment of the cylinder actuated type on-off valve according to the present invention includes a valve body 100, a stem case 200, a valve stem 300, a disk 400, A cylinder rod 600 and a double acting cylinder 700 and may further include an action transmission wheel 800 and a force transmission wheel 900. [

1, the valve body 100 is communicated from an inflow passage 110 formed at a lower portion to an outflow passage 120 formed at one side, and a valve seat 130 is formed in the inflow passage 110 . That is, the transfer fluid flows through the inflow channel 110 of the valve body 100 and then flows out to the outflow channel 120 through the valve seat 130. 3 and 5, the valve seat 130 of the valve body 100 is opened or closed by the disk 400 to be described later so that the fluid to be transferred from the inflow channel 110 to the outflow channel 120 Are transferred and blocked.

The stem case 200 is hollow inside as shown in FIG. 1 and is coupled to the upper portion of the valve body 100. An inflow passage 110 is formed in a lower portion of the valve body 100 and an outflow passage 120 is formed in one side of the valve body 100. The stem case 200 is connected to a valve body 100 Will be the upper portion of the valve body 100 left. The stem case 200 is coupled to the upper portion of the valve body 100 so that the valve stem 300 to be described later is moved up and down inside the stem case 200 to operate inside the valve body 100 through the valve body 100 .

1, the valve stem 300 is vertically movably installed in the stem case 200, and a lower end of the valve stem 300 passes through the upper portion of the valve body 100, And the upper end thereof protrudes upward from the stem case 200.

The disk 400 is coupled to the lower end of the valve stem 300 as shown in FIGS. 1, 3 and 5, and moves upward and downward together with the valve stem 300, 130).

The valve stem 300 and the disc 400 operate together as a single body in which the disc 400 is in a state in which the valve stem 300 is lifted up as shown in Figures 1 and 5, And the disc 400 opens the valve seat 130 in a state in which the valve stem 300 is lowered as shown in FIG. 1 and 5, when the disc 400 closes the valve seat 130, the transfer fluid flowing through the inflow channel 110 of the valve body 100 does not flow out to the outflow channel 120 3, when the disc 400 has opened the valve seat 130, the transfer fluid introduced through the inflow channel 110 of the valve body 100 flows into the outflow channel 120 To the conveying state.

In order to open and close the valve seat 130, the disc 400 needs to be able to move up and down the valve stem 300, and when the valve stem 300 is lifted up and down, A structure capable of opening the disk 400 is required. This can be achieved through the rotation lever 500, the cylinder rod 600, and the double acting cylinder 700, which will be described later.

1, one end of the action point 510 is connected to the upper end of the valve stem 300, and the fulcrum 520 of the rotation center is connected to the other end Is closer to the point of action (510) than the point of action (530). That is, as shown in FIGS. 2 and 4, the length from the fulcrum 520 to the action point 510 is r, the length from the fulcrum 520 to the fulcrum 530 is R, When the force F 1 is applied at the point 530, F 2 at the action point 510 becomes F1 < F 2. That is, the force F2 of the action point 510 can be exerted with a small force F1 of the fulcrum 530. A cylinder rod 600 and a double acting cylinder 700 are provided in a configuration that provides a force to a point of force 530 of the rotary lever 500.

1, 3 and 5, the cylinder rod 600 is coupled to a point of a force of the rotary lever 500 to vertically rotate the rotary lever 500 about the fulcrum 520, The cylinder 700 is a hydraulic or pneumatic cylinder for lifting and lowering the cylinder rod 600.

The working rod 510 and the fulcrum 530 of the rotary lever 500 each have a turning radius so that the vertical movement and the vertical rotation of the cylinder rod 600 and the valve stem 300, In order to connect the motion transfer between the motions, the action transmission wheel 800 and the force transmission wheel 900 are required as shown in Figs. 1 to 6 so that vertical motion and rotational motion are possible. That is, the action transmission wheel 800 is rotatably coupled with the action point 510 of the rotary lever 500 as a rotation center, and one side of the action transmission wheel is pin-coupled with the upper end of the valve stem 300. The force transmission wheel 900 is rotatably coupled with the fulcrum 530 of the rotary lever 500 as a rotation center, and one side of the force transmission wheel 900 is pin-coupled with the cylinder rod 600. Accordingly, even in the case of the cylinder rod 600, the force transmission wheel 900 can be rotated about the fulcrum 530 of the rotary lever 500 so that the vertically acting force of the cylinder rod 600 And the fulcrum 530 can rotate in accordance with the turning radius while transmitting to the fulcrum 530. In addition, the valve stem 300 and action transfer wheel 800 also operate equally at the point of action 510.

1 and 2, when the pressure exerted on the disc 400 by the disc 400 in the state of closing the valve seat 130 is P (P), as shown in FIGS. 1 and 2, The force PF received from the transferred fluid by the disk 400 becomes a value obtained by multiplying the cross sectional area A of the disk 400 by the pressure P. [ The disc 400 should be lowered with a force larger than the force PF received from the transfer fluid so that the disc 400 opens the valve seat 130. [ This is because the force F2 of the action point 510 lowering the valve stem 300 as shown in Figures 3 and 4 must be greater than the force PF received by the disk 400 from the transferred fluid. At this time, F2 can be expressed by a moment M, which is a value obtained by multiplying the length r from the fulcrum 520 to the action point 510, and the moment M can be expressed by a force F1 acting on the fulcrum 530 by the cylinder rod 600 And the length R from the fulcrum 520 to the fulcrum 530, so that F2 = (R / r) F1. More specifically, assuming that PF = 90, R = 5, r = 1 and F2 = 90, F2 = 100 and F2 = 100. That is, the valve stem 300 can be lowered by only a force of F1 = 20 in order to exert a force of F2 = 100, so that the disc 400 can open the valve seat 130.

Conversely, the pressure inside the valve body 100 is constant in the state shown in Figs. 3 and 4, that is, the state in which the disc 400 is opening the valve seat 130. [ Accordingly, the valve stem 300 can be raised by a very small force, so that the disc 400 can close the valve seat 130. [ 5 and 6, when the cylinder rod 600 is lowered by a force of F1 = 20 to the fulcrum 530 by the operation of the double acting cylinder 700, the rotary lever 500 rotates to move the action point 510 The valve stem 300 is raised by a force of F2 = 100 and the disk 400 is closed by the rising of the valve stem 300. [ The force F2 that is transmitted to the valve stem 300 through the action point 510 and the force F2 that is transmitted to the valve stem 300 along with the force PF corresponding to the pressure of the transfer fluid is applied to the disc 400 in the state where the disc 400 closes the valve seat 130. [ 100 can work together to achieve very fast response, that is, rapid opening and closing speed.

However, it is necessary to use the double acting cylinder 700 in accordance with the shape of the disk 400, the structure of the valve seat 130, the opening and closing direction of the valve seat 130 and the like. On the other hand, Since the force F2 = 100 transmitted to the valve stem 300 and the force PF due to the pressure of the transported fluid are added to the disk 400 when the valve 130 is closed and closed due to a very large force, A large stress concentration problem may occur between the valve seat 400 and the valve seat 130. When the disc 400 applies a large force to the action point 510 of the valve stem 300 when the valve seat 130 is opened and the disc 400 is moved to the action point 510 when the valve seat 130 is closed, It is necessary to make it take a little force.

To this end, a second embodiment and a third embodiment of the cylinder actuating opening / closing valve according to the present invention will be described with reference to FIGS.

The cylinder-actuated type on-off valve according to the second embodiment of the present invention includes a valve body 100, a stem case 200, a valve stem 300, a disk 400, And includes a lever 500, a cylinder rod 600, a single acting cylinder 700 'and a stem spring S1, and may further include an action transmission wheel 800' and a force transmission wheel 900 '.

The structure and function of the valve body 100, the stem case 200, the valve stem 300, the rotary lever 500, and the cylinder rod 600 in the second embodiment of the cylinder-operated opening / Is the same as the first embodiment described above. However, in the case of the disk 400, the valve seat 130 of the valve body 100 is merely connected to the lower end of the valve stem 300, as shown in FIGS. 7 to 12, The valve seat 130 of the valve body 100 is closed when the valve stem 130 is lifted upward and downward together with the valve stem 300 and the valve seat 130 of the valve body 100 is opened when the valve stem 130 is lifted.

7 to 12, the stem spring S1 is installed in the stem case 200, and the disc 400 is inserted into the stem case 200, And provides a spring force to the valve stem 300 in a direction of ascending to close the valve seat 130. The stem spring S1 is for securing the closing force of the disc 400 with respect to the valve seat 130 in relation to the single acting cylinder 700 'described later.

Unlike the double acting cylinder 700 of the first embodiment, a single acting cylinder 700 'is provided in the second embodiment. The single cylinder 700' The cylinder rod 600 is lifted up to open the valve seat 130. In contrast, since the disc 400 is a single acting cylinder 700 ', the disc 400 does not provide a force to close the valve seat 130 but uses the spring force of the stem spring S1 described above.

In the second embodiment, unlike the first embodiment, since the spring stem SF1 of the stem spring S1 is urged in the direction in which the valve stem 300 is always raised by the spring force SF1 of the stem spring S1, And the force transmission wheel 900 are not required. The other end of the rotation lever 500 is in contact with the cylinder rod 600 and the other end of the rotation lever 500 is in contact with the upper end of the valve stem 300, It will not be a problem that the force is transmitted to the force 510 and the force point 530, respectively. Even in this case, however, the distance between the working point 510 of the rotary lever 500 and the upper end of the valve stem 300, the fulcrum 530 of the rotary lever 500 and the cylinder rod 600, R, r) may be changed to cause problems in the transmission of the accurate force. Therefore, it is preferable to provide the action transmission wheel 800 'and the force transmission wheel 900' having a structure different from that of the first embodiment. That is, the action transmitting wheel 800 'in the second embodiment is coupled with the center of action 510 of the rotary lever 500 as a circle, and the outer peripheral surface thereof is in contact with the upper end of the valve stem 300. Further, the force transmission wheel 900 'is engaged with the fulcrum 530 of the rotary lever 500 as a circle center, and the outer circumferential surface thereof is in contact with the cylinder rod 600. Thus, the action transmission wheel 800 'in the second embodiment does not need to be rotated to the point of action 510 of the rotary lever 500, and does not need to be pinned to the top of the valve stem 300 State may be maintained. This is also the same in relation to the force point 530 of the force transmission wheel 900 'and the rotary lever 500 and the cylinder rod 600.

7 and 8, when the disc 400 is in a state of closing the valve seat 130 and the disc 400 is in a state of closing the valve seat 130 as shown in FIGS. 7 and 8, When the force due to the pressure is PF, the spring force SF1 received from the stem spring S1 is also received. It is necessary to lower the valve stem 300 with a force larger than the combined force PF + SF1 of the force PF received from the fluid and the spring force SF1 of the stem spring S1, The valve seat 130 is opened. This is because the force F2 of the action point 510 for lowering the valve stem 300 as shown in Figs. 9 and 10 must be greater than the combined force PF + SF1, i.e., F2 = (R / r) F1> (PF + SF1). More specifically, assuming that PF = 90, SF1 = 10 R = 5, r = 1, F2 = 110 = (5/1) F1 and F1 = 22 . That is, the valve stem 300 is lowered only by the force of F1 = 22 in order to exert a force of F2 = 110, so that the disc 400 can open the valve seat 130. [

Conversely, the pressure inside the valve body 100 is constant when the state shown in Figs. 9 and 10, that is, the disc 400 is opening the valve seat 130, is constant. Accordingly, the valve stem 300 can be raised by a very small force, so that the disc 400 can close the valve seat 130. [ 11 and 12, only the drain operation of the single acting cylinder 700 'causes the spring force SF1 of the stem spring S1 to reach the point 510 of the valve stem 300 with a force of F2 = SF1 = 10 The cylinder rod 600 is lowered to the force point 530 under the force of F1 = SF1 / 5 = 2 to be drained. The disk 400 closes the valve seat 130 by the upward movement of the valve stem 300 and the disk 400 is subjected to the force due to the pressure of the transferred fluid in the process of closing the valve seat 130 The force F2 = SF1 = 10 transmitted to the valve stem 300 through the action point 510 together with the force FF acts on the valve seat 130 to be closed. At this time, the force acting on the fulcrum 530 connected to the cylinder rod 600 of the single acting cylinder 700 'starts from the force of the first F1 = SF1 / 5 = 2 and finally the force F1 = SF1 / 5 + PF / 5 = 20 power. Therefore, by using the single acting cylinder 700 'and the stem spring S1 when the disk 400 closes the valve seat 130, the force applied between the disk 400 and the valve seat 130 at the time of closing can be minimized .

However, in the case of the above-described second embodiment, since the force of F1 = 2 for draining the single acting cylinder 700 'is applied in the process of closing the valve seat 130, the responsiveness at closing may be somewhat lowered . In other words, when the double acting cylinder 700 of the first embodiment is used, the response is very fast, but a very large force is applied between the disk 400 and the valve seat 130, 700 'and the stem spring S1 are used, a small force is applied between the disc 400 and the valve seat 130 so that there is little fear of breakage. However, there is a problem that responsiveness is slowed down.

In order to adopt the midpoint between the advantages and disadvantages of the first and second embodiments, a third embodiment of the cylinder actuating opening / closing valve according to the present invention will be described with reference to FIGS.

The third embodiment has the same configuration as the second embodiment, and further includes a cylinder return spring S2. That is, the cylinder return spring S2 is installed inside the single acting cylinder 700 ', and provides the spring force SF2 to the cylinder rod 600 in a direction in which the cylinder rod 600 descends.

The operation of the rotary lever 500 through the cylinder return spring S2 of the third embodiment in the structure of the second embodiment will now be described with reference to FIGS. (R / r) SF2 of the cylinder return spring S2 and the spring force SF1 received from the stem spring S1, when the force due to the pressure received by the disc 400 is PF, ] Is also received. Therefore, when the force (PF) received from the transferred fluid by the disk 400 is equal to the sum of the spring force SF1 of the stem spring S1 and the spring force [R / r SF2] of the cylinder return spring S2, The valve stem 300 must be lowered with a force larger than + SF1 + (R / r) SF2 so that the disc 400 opens the valve seat 130. This is because the force F2 of the action point 510 lowering the valve stem 300 as shown in FIGS. 15 and 16 should be greater than the combined force [PF + SF1 + (R / r) SF2] R / r) (F1-SF2) > (PF + SF1). More specifically, assuming that PF = 90, SF1 = 10, SF2 = 5, R = 5, r = 1 and F2 = 90 + 10 + 25 = / 1) F1, and F1 = 26. That is, the valve stem 300 is lowered only by the force of F1 = 26 in order to exert a force of F2 = 130, so that the disc 400 can open the valve seat 130. [

Conversely, the pressure inside the valve body 100 is constant when the state shown in Figs. 15 and 16, that is, the disk 400 is opening the valve seat 130, is constant. Accordingly, the valve stem 300 can be raised by a very small force, so that the disc 400 can close the valve seat 130. [ 17 and 18, only the drain operation of the single acting cylinder 700 'causes the spring force SF1 of the stem spring S1 to be applied to the action point 510 with the force of F2 = SF1 = 10, And at the same time, the cylinder rod 600 is lowered by force of F1 = SF1 / 5 + SF2 = 7 to the force point 530 and drained. The disk 400 closes the valve seat 130 by the upward movement of the valve stem 300 and the disk 400 is subjected to the force due to the pressure of the transferred fluid in the process of closing the valve seat 130 The force F2 = SF1 + (R / r) SF2 = 35 transmitted to the valve stem 300 through the action point 510 together with the force FF acts on the valve seat 130 to close the valve seat 130 maintain. At this time, the force acting on the fulcrum 530 connected to the cylinder rod 600 of the single acting cylinder 700 'starts from the force of the initial F1 = SF1 / 5 + SF2 = 7 and finally the force F1 = SF1 / 5 + PF / 5 = 2 + 5 + 18 = 25.

Accordingly, when the disc 400 closes the valve seat 130, by using the single acting cylinder 700 ', the stem spring S1, and the cylinder return spring S2 through the third embodiment, The force [SF1 + (R / r) SF2 + PF = 10 + 25 + 90 = 125] between the valve seat 130 and the valve seat 130 is significantly smaller than [PF + F2 = 90 + 100 = 190] Is slightly larger than [SF1 + PF = 10 + 90 = 100] in the second embodiment. The force F1 applied to the initial point 530 corresponding to the speed at which the disc 400 is drained during the closing of the valve seat 130, that is, the speed at which the disc 400 closes the valve seat 130, (R / R) SF1 = 2 in the second embodiment, and the closing rate is 2.5 times larger than the F1 = (r / R) SF1 = 2 in the third embodiment, where F1 = [(r / R) SF1 + SF2] = 2 + The effect is 2.5 times faster in proportion to the second embodiment.

As described above, the cylinder-operated opening / closing valve according to the present invention is configured such that the small force (pressure) of the cylinder rod 600 operated by the double acting cylinder 700 or the single acting cylinder 700 ' The opening and closing speed of the valve 400 can be secured while opening and closing the high-pressure flow path on the disk 400 as the valve stem 300 moves up and down.

The working point 510 and the fulcrum point 530 of the rotary lever 500 connected to the cylinder rod 600 and the valve stem 300 reciprocating in a straight line reciprocate each other and have a respective turning radius, Can be structurally and easily connected through the transmission wheels 800 and 800 'and the force transmission wheels 900 and 900', thereby reducing the waste of power and enhancing the transfer force.

In particular, the double acting cylinder 700 and the single acting cylinder 700 'can be used in the same manner. In the case of the double acting cylinder 700, the advantage of being able to apply force regardless of the opening and closing directions of the disk 400 The single acting cylinder 700 'can be applied only to one direction of the opening or closing of the disk 400, so that it is necessary to waste the force in the opposite direction to the set direction. Can be used.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: valve body 110: inflow channel
120: Outflow channel 130: Valve seat
200: Stem Case
300: Valve stem
400: disk
500: Rotary lever 510: Point of action
520: Fulcrum 530: Strikethrough
600: Cylinder rod
700: Double acting cylinder 700 ': Single acting cylinder
800, 800 ': action transmission wheel
900, 900 ': force transmission wheel
S1: Stem spring
S2: Cylinder return spring

Claims

A valve body communicating from an inflow passage formed in a lower portion to an outflow passage formed in a side surface, the valve body having a valve seat formed in the inflow passage,
A stem case having a hollow interior and coupled to an upper portion of the valve body,
A valve stem which is vertically movable up and down inside the stem case and whose lower end passes through an upper portion of the valve body and is located inside the valve body and whose upper end protrudes above the stem case;
A disk coupled to a lower end of the valve stem and vertically lifting up and down together with the valve stem to close the valve seat of the valve body and to open the valve seat of the valve body upon lowering,
A stem spring installed inside the stem case for providing a spring force to the valve stem in a direction of ascending so as to close the valve seat,
A rotation lever provided at one end of the valve stem and connected to an upper end of the valve stem and having a fulcrum at a rotation center thereof closer to the action point than a force point at the other end;
A cylinder rod connected to a power point of the rotary lever to rotate the rotary lever in normal and reverse directions with respect to the fulcrum;
A single-acting cylinder for raising the cylinder rod in a direction in which the disk descends to open the valve seat,
An action transmission wheel coupled to a point of action of the rotary lever as a center of circle and having an outer peripheral surface in contact with an upper end of the valve stem,
A force transmission wheel coupled to the rotary lever at a center of a circle and having an outer peripheral surface in contact with the cylinder rod,
Further comprising a cylinder return spring installed inside the single acting cylinder to provide a spring force to the cylinder rod in a direction to lower the cylinder rod.

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