KR20010064585A - Control check valve - Google Patents

Abstract

PURPOSE: A control valve is provided to decrease water shock caused by double two-stage closing structure and to have a flux regulative valve function and an interception valve function except for a reverse flow preventive function by adjusting an opening degree with equipping a forcible opening instrument automatically or manually driven. CONSTITUTION: For opening a valve or draining fluid toward a pump, a hand wheel rotates. Bevel gears and a worm turn around for rotating a worm gear(38). Herein, another end of a segment(16) fixed to a segment gear(8) is butted to the other end of the worm gear for enabling the worm gear to rotate the segment and the segment gear. A valve shaft(4) connected with a key on a boss portion of the segment gear rotates for opening a valve disk. Herein, an indicating needle(36) rotates as much as a moved amount of worm gear to an opened position from a check position to order.

Description

CONTROL CHECK VALVE

The present invention relates to a control check valve, and in particular, by installing the internal closing speed control means in the interior of the cylinder that is installed to act as a dash port at both ends of the valve shaft and an external closing speed adjustment means in the external hydraulic piping to emergency closing When the valve disc closes quickly in one step, the water shock can be reduced by a dual two-stage single-force structure that closes slowly in this step, and it is provided with a forced opening and closing means that is manually and / or automatically driven to adjust the opening degree. The present invention relates to a control check valve that has a flow control valve function and a shutoff valve function in addition to the reverse flow prevention function.

In general, a check valve installed in a conventional water supply pipe has a structure in which a valve disc is rotatably installed in an inside of the valve body, and only a reverse flow blocking function to block back flow in case of an emergency in which a pumping force is blocked due to a power failure. I had.

Therefore, there is a problem in that a separate flow control valve and a shutoff valve must be installed for this purpose because there is no flow control function and a shutoff function to control the discharge amount.

Moreover, the conventional check valve has a problem in that the impeller of the pump is damaged as well as the valve itself is damaged by water shock since the valve disc is closed immediately and rapidly due to the reverse flow during the reverse flow.

The present invention was devised to solve such a conventional problem and defects, and the internal closing speed adjusting means is installed in the cylinder which is installed to act as a dash port at both ends of the valve shaft and the external closing speed in the external hydraulic pipe. It is possible to reduce the water shock by the dual two-stage unitary structure, in which the valve disc closes quickly in one stage and then slowly closes in two stages in case of emergency closing by installing the adjusting means. It is to provide a control check valve having a flow control valve function and a shut-off valve function in addition to the reverse flow prevention function by adjusting the opening degree.

1 to 7 are views of the control check valve according to an embodiment of the present invention,

1 is a front view showing the hydraulic system diagram together.

2 is a plan view.

3 is a cross-sectional view showing a valve disc closed state.

Figure 4a is a longitudinal sectional view showing the internal structure of the gearbox.

Figure 4b is a partial perspective view of the segment gear, segment and worm gear shown.

5 is a configuration diagram of an indicator.

Figure 6 (a) is a cross-sectional view showing the guide means of the piston rod.

(b) is a side view.

Figure 7 (a) is a cross-sectional view of the position detection means.

(b) is a longitudinal cross-sectional view.

8 is a configuration diagram of the control shaft manual and automatic drive means.

<Description of the reference numerals for the main parts of the drawings>

1: valve body 2: gearbox

3: valve disc 4: valve shaft

4a: camshaft 8, 9: segmented gear

10: rack gear 10a: back side

11: piston 11c: protrusion

11d: bottom plate 11e: euro

11f: space part 12: internal closing speed adjusting means

13, 14: cylinder 15: external closing speed adjusting means

16 segment 16a, 16b both ends

17: piston rod 18: hydraulic piping

18a, 18b: upper port 18c, 19c: extension tube

19: hydraulic piping 19a, 19b: lower port

20: check valve 21: flow control valve

22: oil pressure tank 26: timing solenoid valve

26a: knob 27: operating means

27a: cam 27b: curved surface

29a, 29b, 29c: limit switch 29d: open detection sensor

30: position detection means 35: scale plate

36, 37: needle 38: worm gear

38a, 38b: Both ends 39: Worm

40: adjusting shaft 41, 42: bevel gear

42: flow rate control valve 43: guide means

43a: Roller 43b: Bracket

45: handwheel 46: driver

47: forced opening and closing means

In order to achieve the above object, the control check valve according to the present invention has a segment gear fixed to both ends of a valve shaft rotatably supporting a valve disc to a valve body, and a cylinder on both gear boxes in which the segment gear is built. And a rack gear is formed on the piston rod coupled to the piston of the cylinder, and is engaged with the segment gear so that the opening and closing force is equally applied to the valve shaft of the valve disc by both cylinders. The cylinder is provided with an internal closing speed adjusting means for closing the valve disk quickly in one step and then slowly closing in this step when the emergency closing due to the pumping force is released.

The internal closing speed adjusting means has a protrusion formed on the piston, a space portion into which the protrusion is inserted is formed in the bottom plate of the cylinder, and a flow passage smaller than the space portion is formed on one side of the bottom plate. One side of the flow control valve is configured to be coupled.

This internal closing speed adjusting means is to minimize the transmission of water shock by allowing the valve disk to close quickly in one step and then slowly close in this step. Other forms may be applied by applying the principle of release.

In addition, both cylinders are provided with an external closing speed adjusting means for closing the valve disk quickly in one step after the closing of the valve disk in one step in case of emergency closing due to the release of the pumping force in the hydraulic pipe for distributing the pressure oil. In one embodiment of the external closing speed adjusting means, the hydraulic pipe is connected to the upper port of the both cylinders, the hydraulic pipe is connected to the lower port, respectively, the extension pipe is connected to the hydraulic pipe, the end of the extension pipe A hydraulic oil tank is connected, and a check valve, a flow control valve, and a timing solenoid valve are connected in parallel between the extension pipes, and an operating means for operating the timing solenoid valve is provided.

The external closing speed adjusting means also applies a principle that a large amount of the pressure oil inside the cylinder is discharged in one step, and a small amount is discharged in this step.

The one-step closing amount of the valve disk is preferably set in the range of 90% to 70% of the total opening in consideration of the closing speed of the valve disk.

The actuating means of the timing solenoid valve has a cam shaft fixed to an end of the valve shaft, and the cam shaft is fixed to the cam shaft so that the curved surface of the cam actuates the knob of the timing solenoid valve. It is preferable to operate in conjunction with the shaft, it is also possible to use a structure that is opened and closed by a separate electrical signal.

In addition, the control check valve of the present invention is provided with a forced opening and closing means for forcibly opening and closing the valve disk for the purpose, in addition to the reverse flow prevention function such as the flow rate adjustment function and the blocking function, one form of the forced opening and closing means is A semi-circular worm gear is fixed to one side of the fan-shaped segment gear at the end of the valve shaft in the gearbox to which the cylinder of one side of the valve shaft is coupled, and the worm engaged therein is coupled to the lower portion of the gearbox. Bevel gears are coupled to the ends of the worm and the control shaft to be engaged with each other, a segment is fixed to one side of the one-sided segment gear so that both ends thereof are in contact with both ends of the worm gear is coupled to transmit the rotational force, The handwheel is fixed to the upper end of the adjustment shaft.

This forced opening and closing means is to open and close the valve disc for the purpose of controlling the flow rate of the pipeline and blocking the pipeline in addition to the opening and closing operation for the reverse flow prevention function. There is a feature to make it, the specific configuration for this forced opening and closing means may be configured in a form other than the combination of the worm gear, worm and handwheel. In addition, the control shaft of the forced opening and closing means may be coupled to an automatic driver such as an electric motor to automatically open and close as necessary.

In addition, the rear portion of the piston rod is provided with a guide means for preventing the back pushed back by the rack gear and the segment gear installed on the front, one form of the guide means is a portion in which the rack gear of the piston rod is formed It is configured by contacting the roller on the back of the bracket is attached to the bracket, this guide means may also use other forms.

In addition, the control check valve of the present invention is configured to detect the fully closed, the full opening of the valve disk, to detect the one-stage closing, position sensing means for detecting the open position of the valve disk. One form of this position sensing means is combined with a limit switch for detecting the full closing and the full opening of the valve disk and a limit switch for the one step closing detecting the one-step closing, and for detecting the open position of the valve disc. The open sensor for the combination is configured.

In addition, the gear box is provided with an indicator for indicating the rotation angle of the valve disc and the rotation angle of the worm gear, one type of the indicator is coupled to the worm gear coupled to the valve shaft and An indicator needle is fixed to an end portion of the valve shaft that protrudes from the worm gear, and a scale plate is fixed to the gear box front plate, and configured to measure the rotation amount of the worm gear and the valve disc by the indicator needle.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 7 are views of a control check valve according to an embodiment of the present invention, Figure 1 is a front view showing a hydraulic system diagram, Figure 2 is a plan view, Figure 3 is a cross-sectional view showing a valve disc closed state, respectively 4A is a longitudinal cross-sectional view showing the internal structure of the gearbox, FIG. 4B is a partial perspective view showing the segment gear, the segment, and the worm gear, respectively, and FIG. 5 is a schematic diagram of the indicator.

As shown in the drawing, in the control check valve according to the present invention, the valve disc 3 is fixed to the valve body 4 by the valve shaft 4, and the segment gear 8, ( 9) are fixed to each other, and an arm 6 is fixed to one end of the valve shaft 4, and a weight 7 on which a plurality of weight plates are stacked is coupled to the arm 6.

The cylinders 13 and 14 are fixed to the gear boxes 2 respectively coupled to both side portions of the valve shaft 4, and the piston rods coupled to the pistons 11 of the cylinders 13 and 14 ( A rack gear 10 is formed in 17 and meshes with the segment gears 8 and 9.

The valve disc 3 is connected to the valve shaft 4 and the disk pin 5 and is connected to the segment gears 8 and 9 by the keys 4b and 4c provided on the valve shaft 4. Connected,

O-rings 11a and 11b are coupled to the outer circumferential surface of the piston 11, and protrusions 11c are formed, and the bottom plate 11d of the cylinders 13 and 14 is formed of the piston 11. A space portion 11f into which the protrusion 11c is inserted is formed in the center, a flow passage 11e is formed, and a flow rate control valve 42 is coupled to one side of the flow passage 11e.

The cylinders 13 and 14 have inner spaces divided into upper and lower portions 14a and 14b by pistons 11, and upper ports 18a on upper portions of the main walls of the cylinders 13 and 14, respectively. And 18b are formed, and lower ports 19a and 19b are formed in the lower part, respectively.

When the hydraulic oil flowing through the upper ports 18a and 18b of the cylinders 13 and 14 acts on the upper portion 14a, the piston 11 and the piston rod 17 move downward, and the piston 11 Until the projection 11c of the () is inserted into the space portion 11f of the bottom plate 11d, a large amount of pressure oil is discharged through the lower ports 19a, 19b, and the projection 11c of the piston 11 ) Is inserted into the space portion 11f of the bottom plate 11d, the pressure oil of the lower portion 14b is less discharged through the flow passage 11e.

Therefore, the one-step until the valve disc 3 is closed when the counterflow is applied and the projection 11c of the piston 11 is inserted into the space 11f of the bottom plate 11d is quickly closed. After the protrusion 11c is inserted into the space 11f, it is gradually closed at this stage.

Hydraulic pipes 18 are connected to the upper ports 18a and 18b of both cylinders 13 and 14, and hydraulic pipes 19 are connected to the lower ports 19a and 19b, respectively. The extension pipes 18c and 19c are connected to the hydraulic pipes 18 and 19, and the check valve 20, the flow control valve 21, and the timing solenoid are extended between the extension pipes 18c and 19c. The valves 26 are connected in parallel with each other, and the oil pressure tank 22 is connected to an end of the extension pipe 18c. The timing solenoid valve 26 is actuated by actuation means 27.

The pressure oil tank 22 is connected to the end of the extension pipe (18c) via the stop valve 31, the refill port 34 for supplying the pressure oil, and the discharge valve 32 for discharging as needed Are coupled, and the flowmeter 33 is coupled.

The actuating means 27 of the timing solenoid valve 26 has a cam shaft 4a fixed to an end of the valve shaft 4, and a cam 27a is fixed to the cam shaft 4a so that the curved surface of the cam 27a is fixed. 27b is adapted to actuate the knob 26a of the timing solenoid valve 26.

In addition, the check valve of the present invention is provided with a force opening and closing means 47 for forcibly opening and closing the valve disc 3 manually and / or automatically in order to have a flow control valve function and a shut-off valve function in addition to the backflow prevention function. .

The forced opening and closing means 47 is a semi-circular worm gear to be positioned outside the segment gear 8 at the end of the valve shaft 4 in the gear box 2 to which the cylinder 13 of one side of the valve shaft 4 is coupled. 38 is fixed, the worm 39 is engaged to the lower portion, the one side of the gearbox 2 is coupled to the control shaft 40 and the end of the worm 39 and the control shaft 40 Bevel gears 41 and 42 are coupled to each other and engaged with each other, and the handwheel 45 is fixed to the upper end of the adjustment shaft 40.

The gearbox 2 is manufactured in a hermetic and oil bath type because the worm 39 is multi-rotated so that the worm 39 is always immersed in the gear oil.

Segment 16 is fixed to one side surface of the one side segment gear 8 so that both ends 16a and 16b are in contact with both ends 38a and 38b of the worm gear 38 to transmit rotational force. It is supposed to be.

Figure 6 (a) is a cross-sectional view showing the guiding means of the piston rod, (b) is a side view, as shown therein, the piston rod 17 is a rack gear 10 formed on its front surface and the segment engaged therewith Guide means 43 for preventing this is provided because of the force pushed back by the gear 8, the guide means 43 is the rear of the portion where the rack gear 10 of the piston rod 17 is formed The piston rod 17 is stably linearly moved by contacting the roller 43a with 10a to prevent the piston rod 17 from being pushed backward. The roller 43a is attached to the bracket 43b fixed to the side of the gearbox 2 with the shaft 43c.

In addition, the gear box 2 is provided with an indicator for indicating the rotation angle of the valve disk 3 and the rotation angle of the worm gear 38, one type of the indicator is provided on the valve shaft (4) The indicator needle 36 is coupled to the worm gear 38 rotatably coupled thereto, and the indicator needle 37 is fixed to the end of the valve shaft 4 protruding from the worm gear 38. The front of the gear box 2 is fixed. The scale plate 35 is fixed to the plate so that the rotation amount of the worm gear 38 and the valve disc 3 is measured by the indicating needles 36 and 37.

A scale for measuring the rotation angle of the valve shaft 4, the valve disk 3 is displayed on the upper portion of the scale plate 35, a scale for measuring the rotation angle of the worm gear 38 is displayed on the lower portion, The indication needle 36 is instructed to rotate by the amount of movement of the worm gear 38 from the check position CK to the open position OP.

Figure 7 (a) is a cross-sectional view of the position sensing means, (b) is a longitudinal cross-sectional view, as shown, the position sensing means 30 is a valve disk at the end of the valve shaft (4) Limit switch 29a, 29b for detecting full close and full open of (3), and limit switch 29c for one-step close detection, for example, for detecting a 90% closed state. The detection sensor 29d for detecting the open position of the valve disc 3 is coupled, and the cover 28 for protecting them is coupled. For example, the sensor 29d may be used as a variable resistance sensor, in which a current value is variably output in the range of 4 to 20 mA as the resistance value changes according to the position of the valve shaft 4.

By using the position detecting means 30 as described above, the control check valve of the present invention may check the operation state with an electric signal in a control room far from the field, and operate the valve operation remotely.

8 shows the configuration of the control shaft manual and automatic drive means, by installing the driver 46 on the control shaft 40 for manipulating the opening of the valve disc 3, the control shaft 40 is handwheel By 45, it is possible to rotate manually or by using the driver 46 as needed.

Referring to the operation of the control check valve according to the present invention as described above are as follows.

First, the opening operation of the control check valve of the present invention will be described. The valve disc 3 is automatically opened when the pressure of about 0.5 to 1.0 kgf / cm ² is reached by the discharge amount of the pump.

Here, the valve disc is connected to the valve shaft (4) and the disk pin (5), and the segment gear (8), (9) by the keys (4b, 4c) provided on the valve shaft (4) And segment gears (8) and (9) are connected to the rack gear (10) partially formed in the piston rod (17) installed inside the cylinders (13) and (14), and the piston rod (17). Is connected to the piston 11 and is moving.

At this time, since the pistons 11 of the cylinders 13 and 14 move upward, the pressure oil of the upper portion 14a of the piston 11 passes through the hydraulic piping 18 to the check valve 20 and the hydraulic piping 23 And the lower portion 14b of the cylinders 13 and 14 through the cylinder lower ports 19a and 19b.

At this time, the cylinders 13 and 14 have a volume difference between the upper portion 14a and the lower portion 14b around the piston 11, i.e., the amount of pressure oil when the valve disc 3 is closed may be opened. Since the amount of pressure oil of the lower portion 14b at the time is smaller by the volume difference of the piston rod 17 than the upper portion 14a, the pressure oil of the difference volume flows into the pressure oil tank 22.

Since the cylinders 13 and 14 for dashpots, which alleviate the impact of the actuated control check valve, are installed at both ends of the valve shaft 4, the valve shaft 4 during valve operation is Stable operation without twisting

Therefore, the valve disc 3 is kept open by the flow rate discharged from the pump because there is no other special resistance.

Next, the opening degree of the control check valve, that is, the opening angle and the closing angle adjustment action will be described. The opening degree of the control check valve is to adjust the opening and closing angle of the valve by closing the valve in the open state of the valve. The adjusting method is to rotate the handwheel 45 to the right, that is, to the right direction, the bevel gears 41 and 42 connected to the adjusting shaft 40 rotate, and the worm gear 38 to the right by the worm 39 connected thereto. And the one end portion 16a of the segment 16 connected to the segment gear 8 in series is in contact with the one end portion 38a of the cutout portion (38) of the worm gear 38. As it passes, the segment 16 rotates to the right, which causes the segment gear 8 to rotate to the right together.

In addition, since the rack gear 10 is engaged with the segment gear 8 and moves, the piston rod 17 moves downward and the piston 11 connected to the piston rod 17 moves downward by an adjusted amount. The upper part 14a of (13) and (14) is supplemented with pressure oil.

This replenishment includes the hydraulic oil in the lower portion 14b of the cylinders 13 and 14, the lower ports 19a and 19b of the cylinders 13 and 14, the hydraulic piping 24 and 25, the flow rate. The control valve 21, the timing solenoid valve 26, the hydraulic pipe 18 and the upper ports (18a, 18b) of the cylinders 13, 14 flows in, and the insufficient amount is supplied from the hydraulic oil tank (22). It is replenished through the stop valve 31 and the hydraulic pipe (18).

Subsequently, the emergency closing of the control check valve will be explained. When the motor of the pump is stopped due to a power failure while the valve disc 3 is open, fluid such as water flowing in the pipe flows backward and generates water pressure. If the impeller of the pump hits the pressure directly, the expensive pump is damaged, so the valve must be closed in advance so that the pump is not directly affected by this shock pressure.

Therefore, if a backflow occurs when the valve is open, the valve is closed by the rotational force due to the weight of the weight 7 of the valve disc 3 and the weight 6 connected to the arm 6, where the weight 7 is the weight It consists of several plates to control the.

The valve disc 3 can be emergency closed even when it is in any opening degree, and does not require its own power due to the reverse flow, but the reverse force, the rotation force by the weight of the valve disc 3 and the rotation force of the weight 7, For example, it closes quickly in one step up to 90% closure.

When the valve disc 3 reaches the one-step closing point in this manner, the projection 11c of the piston 11 is inserted into the space portion 11f formed in the bottom plate 11d of the cylinders 13 and 14. Then, the inlet is blocked, and the pressure oil gradually flows out through the space portion 11f and the lower ports 19a and 19b while being controlled by the flow control valve 42 through the flow passage 11e. Accordingly, the valve disc 3 is slowly closed at this stage.

When the valve disc 3 reaches the one-step closing point, the cam shaft 4a is coupled to the end of the valve shaft 4 and the cam 27a is fixed to the cam shaft 4a so that the cam 27a is secured. As it rotates with the valve shaft 4, the curved surface 27b of the cam 27a presses the knob 26a of the solenoid valve 26 to close the timing solenoid valve 26. When the timing solenoid valve 26 is closed, the flow path flowing through the hydraulic pipe 25 and the timing solenoid valve 26 is closed, and the pressure oil is adjusted by the check valve 20 while the hydraulic flow passage 24 is adjusted. Through the flow through the upper portion (14a) of the cylinders (13), (14), the valve disc (3) is also gradually closed in this step by the flow control valve (21).

The valve disc 3 is closed in one step during emergency closing, and then the flow path 11e of the cylinders 13 and 14, the flow control valve 42, and the timing solenoid valve 26 of the hydraulic pipe. Since the flow rate is controlled by the flow rate control valve 21 to close the flow slowly, this flow is slowly closed in this step, so that the backflow water pressure is gradually applied to the pump, thereby preventing damage to the pump due to instantaneous rapid application. do.

In addition, the two-stage delay closing operation of the valve disc 3 is adjusted only by the flow paths 11e and the flow rate control valve 42 of the cylinders 13 and 14, and the timing solenoid valve 26 of the hydraulic piping Since the flow rate control valve 21 is to be dually controlled can be operated safely in case one side is broken.

In addition, since the closing operation of the timing solenoid valve 26 is controlled by the cam 27a coupled to the valve shaft 4, the step of the valve disc 3 is changed by changing the position of the cam 27a. The closing amount can be adjusted to 90%, 85%, 80%, 75%, 70%, etc. The one-step closing amount of the valve disc 3 can be freely adjusted at any angle, but is preferably adjusted in the range of 70% to 90% in consideration of the total closing time of the valve disc 3.

As described above, when the valve disc 3 is closed, the segment gear 8 engaged with the rack gear 10 of the piston rod 17 as the piston rod 17 of the cylinders 13 and 14 moves downward. (9) turns to the right, so that the segments (16) turn to the right together so that the other end (16b) is in contact with the other end (38b) of the worm gear (38).

As the valve disc 3 is closed as described above, the piston rods 17 of both the cylinders 13 and 14 are formed on the rear surface 10a of the portion where the rack gear 10 is formed. Since the rollers 43a are in contact with each other, the linear motion of the rollers 43a is smoothly performed without being pushed backwards, thereby the valve disc 3 is stably closed.

Hereinafter, the opening of the emergency closed valve will be described.

In order to discharge the fluid in the pipeline to the pump or to open the valve in the closed state as described above, rotate the handwheel 45 to the outside to rotate the bevel gears 41, 42 and the worm 39. 38 is rotated to the left, and at this time, since the other end 16b of the segment 16 fixed to the segment gear 8 is in contact with the other end 38b of the worm gear 38, the worm gear 38 is connected to the segment ( 16 and the segment gear 8 are rotated to the left, whereby the valve shaft 4 connected by the key 4b to the boss portion of the segment gear 8 is rotated to open the valve disc 3. At this time, the indication needle 36 is rotated by the amount of movement of the worm gear 38 from the check position CK to the open position OP to instruct.

At this time, when the operation is completed after opening the valve disc (3), the handwheel 45 must be operated so that the indication needle 36 is returned to the check position CK. If not, the valve may not close as long as it is open.

When the opening of the valve disc 3 is adjusted by rotating the worm 39 with the automatic driver 46, the opening of the valve can be automatically adjusted.

As described above, the present invention provides an inner closing speed adjusting means in a cylinder installed at both ends of the valve shaft to serve as a dash port, and an external closing speed adjusting means in an external hydraulic pipe, thereby providing an emergency closing valve disk. Since a two-stage single-force structure is adopted, in which the quick closing in one step is followed by the closing in two steps, it is possible to prevent damage to the valve itself and the pump by reducing the water shock when the backflow is blocked.

In addition, there is an advantage to have a flow control valve function, a shutoff valve function and a drain valve function in addition to the reverse flow prevention function by providing a forced opening and closing means that is manually and / or automatically driven opening and closing means.

In addition, there is an advantage of ensuring the normal check function safely by returning the worm gear to the check position by a force opening / closing means when draining.

In addition, an indicator is installed in the gearbox so that the upper half of the indicator indicates the open position of the valve disc, and the lower half indicates the actual position of the worm gear so that all information regarding the operation of the valve can be visually checked. The position detection means installed on the shaft receives the opening position of the valve disc as an electrical signal, and has the effect of remotely operating the valve from a distance.

Such a control check valve of the present invention has a check valve function, a flow control function, a shutoff valve and a drain valve function can be widely and very advantageously used for pipes for various fluid transfer including water supply pipes, It is installed on the discharge side of the pump so that it can be closed in emergency in the case of reverse flow, it can be used as a check valve, control the discharge amount to adjust the flow, and also can be used as an emergency shut-off valve. In addition, there is an effect that the maintenance of the plumbing equipment is very simple.

Claims (15)

Segment gears 8 and 9 are fixed to both ends of the valve shaft 4 rotatably supporting the valve disc 3 to the valve body 1, and the segment gears 8 and 9 are Cylinders 13 and 14 are respectively installed on the upper parts of both gear boxes 2 to be built-in, and a rack gear is mounted on the piston rod 17 coupled to the pistons 11 of the cylinders 13 and 14. (10) is formed to engage the segment gear (8), (9) so that the opening and closing force is evenly applied to the valve shaft (4) of the valve disc (3) by the two cylinders (13), (14). In addition, both the cylinder 13, 14 has an internal closing speed control means for closing the valve disc 3 quickly in one step after the emergency closing due to the release of the pumping force (in this step) ( 12) is provided with a control check valve. According to claim 1, The inner closing speed adjusting means 12 is formed with a projection (11c) on the piston 11, the bottom plate (11d) of the cylinder 13, 14, the projection 11c. 11f of the space is inserted into the center, a flow path 11e smaller than the space portion 11f is formed at one side of the bottom plate 11d, and the flow rate is adjusted at one side of the flow path 11e. Control check valve, characterized in that the valve 42 is configured to be coupled. 2. The valve disc (3) according to claim 1, wherein the valve disc (3) is quickly closed in one step at the time of emergency closing due to the release of pumping force in the hydraulic pipe for distributing the hydraulic oil to both the cylinders (13) and (14). Control check valve, characterized in that configured to be provided with an external closing speed adjusting means (15) to close slowly. According to claim 3, The external closing speed adjusting means 15 is connected to the hydraulic pipe 18 to the upper port (18a, 18b) of the cylinder 13, 14, the lower port (19a) ), (19b) is connected to the hydraulic pipe 19, respectively, the hydraulic pipe (18), 19 is extended extension pipe (18c), (19c) is connected, the oil pressure at the end of the extension pipe (18c) The tank 22 is connected, and the check valve 20, the flow control valve 21, and the timing solenoid valve 26 are connected in parallel between the extension pipes 18c and 19c, respectively, and the timing solenoid valve ( 26. The control check valve, characterized in that configured to be provided with an operating means (27) for operating. 5. The actuating means (27) of the timing solenoid valve (26) has a cam shaft (4a) fixed to an end of the valve shaft (4), and a cam (27a) is fixed to the cam shaft (4a). Control check valve, characterized in that the curved surface (27b) of the cam (27a) is configured to actuate the knob (26a) of the timing solenoid valve (26). 2. The control check valve according to claim 1, characterized in that the valve disc (3) is provided with a force opening / closing means (47) for opening and closing the valve disc (3) in order to regulate the flow rate of the pipeline and block the pipeline in addition to the non-return function. The method of claim 6, wherein the forced opening and closing means 47 is a semi-circular worm gear 38 at the end of the valve shaft (4) in the gear box (2) to which the one side cylinder 13 of the valve shaft (4) is coupled The segment gear 8 is fixed to be located at one side, and the worm 39 engaged with the segment gear 8 is coupled to the lower portion, and the adjustment shaft 40 is coupled to one side of the gear box 2 and the worm 39 Bevel gears 41 and 42 are coupled to end portions of the adjustment shaft 40 so that the bevel gears 41 and 42 are engaged with each other, and segments 16 are protruded to one side of the one side segment gear 8 so that both ends 16a thereof, 16b is coupled to both ends 38a and 38b of the worm gear 38 so that rotational force is transmitted, and a handwheel 45 is fixed to an upper end of the adjustment shaft 40. Control check valve. The rear portion of the piston rod (17) is provided with a guide means (43) for preventing the back from being pushed back by the rack gear (10) and the segment gear (8) installed in front of it. Control check valve characterized in that. 9. The guide means (43) according to claim 8, wherein the guide means (43) is brought into contact with the roller (43a) which is condensed to the bracket (43b) on the rear face (10a) of the portion where the rack gear (10) of the piston rod (17) is formed. Control check valve, characterized in that configured. According to claim 1, wherein the position detection means 30 for detecting the fully closed, the full opening of the valve disk 3, the one-stage closing, the open position of the valve disk 3 is provided Control check valve, characterized in that configured. The position detecting means (30) according to claim 10, wherein the position detecting means (30) includes a limit switch (29a) and (29b) for detecting a full closing and a full opening of the valve disc (3) and a one-step closing for detecting a one-step closing. A control check valve, characterized in that the detection limit switch (29c) is coupled, the opening detection sensor (29d) for detecting the open position of the valve disc (3) is coupled. 2. The control check valve according to claim 1, wherein a driver (46) for automatically driving an adjustment shaft (40) for manipulating the opening of the valve disc (3) is coupled. 8. The control check valve according to claim 7, wherein the gear box (2) is provided with an indicator indicating the rotation angle of the valve disc (3) and indicating the rotation angle of the worm gear (38). According to claim 13, wherein the indicator needle is coupled to the worm gear 38, the indicator needle 37 is fixed to the end of the valve shaft 4 protruding from the worm gear 38, The scale plate 35 is fixed to the front plate of the gearbox 2 so that the amount of rotation of the worm gear 38 and the valve disc 3 is configured to measure by the indicating needles 36 and 37. Control check valve. The control check valve according to any one of claims 1 to 14, wherein the one-step closing amount of the valve disc (3) is set in the range of 90% to 70% of the total opening amount.