JPS5845629B2 - Control valve with shutoff function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control valve, and particularly to a control valve for controlling the pressure and flow rate of fluid.

As a typical prior art, a governor has been used to control the pressure on the secondary side to be constant.

This conventional governor does not have a shutoff function that completely shuts off fluid flow, and in order to avoid fluid leakage in the unlikely event that the valve is closed, a shutoff valve is installed separately upstream or downstream of the governor. It was necessary to set it up.

In addition, if a shutoff valve is not provided, a relief valve is installed to release fluid on the secondary side to prevent the secondary side of the governor from becoming high pressure due to fluid leaked from the primary side when the governor valve is closed. It was necessary to set up

Other prior art solutions to this problem, such as those shown in U.S. Pat. The valve automatically opens when the pressure returns to normal.

Therefore, it is dangerous to commonly supply city gas through such a control valve to apartment complexes, condominiums, and underground malls with many tenants.

This is because if the control valve is once closed and then automatically opened again, city gas will be released from the gas appliance that was being used when the valve was closed.

Therefore, once the valve is in the closed state, it is necessary to configure the valve so that it can be opened after confirming safety.

An object of the present invention is to provide a control valve for controlling the pressure and flow rate of a fluid that does not automatically open even if the fluid pressure returns to normal after the valve is closed. be.

In such a control valve, it is desirable to force the valve to close even if the fluid pressure is normal in an emergency.

It is therefore another object of the present invention to provide a control valve that can be forced closed even when fluid pressure is normal.

The present invention includes a valve body having a flow path with a valve hole in the middle, a first valve body displaceable in the axial direction on the upstream side or downstream side of the valve hole, and a first valve body for adjusting the opening degree of the valve hole. 1 valve means, a second valve means having a second valve body displaceable in the axial direction on the upstream side of the valve hole and for closing the valve hole; It has a concave recess, and in the circumferential direction of the recess - in a good example,
a first cam having a recess release cam surface that is inclined toward the other side in the circumferential direction along the radial inward direction; a recess that is recessed in the radial direction; and the recess-fitting surface of the recess is radially inwardly equal to the corresponding recess-leaving cam surface or inclined in the circumferential direction, and the recess-fitting surface is a second cam having an arcuate cam surface continuously formed at a radially outer end of the surface; a first valve stem extending toward the valve hole and having one end connected to the first valve body; downstream of the valve hole; means for displacing the first valve stem in the axial direction in response to pressure on the side or upstream side, the means being concentric with the first valve stem and movable in the mutual axial direction, and having one end connected to the second valve body; The other end has a follower that can come into contact with the cam surface and is applied with a spring force in the radial inward direction of the first cam and the second cam, as well as a second valve stem on the downstream side or upstream side of the valve. the first cam to an angular position corresponding to the pressure value in response to the pressure on the side; and the first cam is at the extreme end position of mutual angular displacement with respect to the second cam, the radially outer end of the recess-fitting surface is selected to be in the position of the recess of the first cam. , the recess release cam surface is shaped to allow the first cam to transition to the arcuate cam surface when the follower is removed from the recess, and the second valve means closes when the follower is inserted into the recess. This is a control valve having a shutoff function, characterized in that it is in an open state when it is in a circular cam surface.

When the follower of the second valve stem is in contact with the arcuate cam surface of the second cam due to spring force, the second valve means is open, and the change in pressure on the downstream or upstream side of the valve causes the first valve means to open. The flow rate and pressure of the fluid are kept constant, and at this time, the first cam is angularly displaced in response to the pressure, and when the first cam is at the extreme end position of the mutual angular displacement with respect to the second cam, the second cam is A radially outer end of the recess-fitting surface of the cam is located at the recess of the first cam.

Therefore, when the pressure on the downstream or upstream side of the valve changes and reaches the upper or lower limit pressure, the follower fits into each recess of the first and second cams along the recess fitting surface of the second cam, and therefore The second valve means brings the valve into a closed state.

Thereafter, when the follower leaves the recess, the first cam moves from the recess exit cam surface to the arcuate cam surface, thereby opening the valve.

Therefore, even if the pressure on the downstream or upstream side of the valve returns to normal, the valve will not automatically open.

Therefore, when city gas is commonly supplied to many gas appliances through the control valve, it is necessary to confirm that city gas is not undesirably released from each gas appliance before returning the valve to the open state. This improves safety.

Further, according to the concept of the present invention, the valve body includes a flow path having a valve hole in the middle, and a first valve body that is freely displaceable in the axial direction on the upstream or downstream side of the valve hole, and the opening degree of the valve hole is controlled. a first valve means for adjusting; a second valve means having a second valve body displaceable in the axial direction on the upstream side of the valve hole and for closing the valve hole; supported for reciprocating angular displacement about the axis; It has a recess that is concave inward in the radial direction, and in the circumferential direction of the recess.
a first cam having a recess release cam surface that is inclined toward the other side in the circumferential direction along the radial inward direction; a recess that is recessed in the radial direction; and the recess-fitting surface of the recess is radially inwardly equal to the corresponding recess-leaving cam surface or inclined in the circumferential direction, and the recess-fitting surface is a second cam having an arcuate cam surface continuous to the radially outer end of the surface; a first valve rod extending toward the valve hole and having one end connected to the first valve body; downstream or upstream of the valve hole; means for displacing the first valve stem in the axial direction in response to pressure on the side, the means being concentric with the first valve stem and movable in the mutual axial direction, one end being connected to the second valve body and the other end being displaceable in the axial direction; has a follower that can contact each of the cam surfaces and is applied with a radially inward spring force of the first cam and the second cam, and a second valve stem on the downstream or upstream side of the valve. It includes means for responding to pressure and driving the first cam by angular displacement to an angular position corresponding to the pressure value, and the mutual allowable angular displacement between the first cam and the second cam is such that the follower is on the arcuate cam surface and with the first cam being at the extreme end position of their mutual angular displacement with respect to the second cam, the radially outer end of the recess-fitting surface is selected to be in the position of the recess of the first cam; The release cam surface is shaped to allow the first cam to move to the arcuate cam surface when the follower is removed from the recess, and the second valve means is in a closed state when the follower is inserted into the recess. There is a planetary gear that revolves in conjunction with the first cam, and a sun that is connected with the same axis as the first cam and drives the first cam by angular displacement. A control valve having a shutoff function, comprising a planetary gear means having a gear and a ring gear, and an operation means for angularly displacing the ring gear of the planetary gear means to fit a follower on an arcuate cam surface into a recess. is realized.

The follower can be forcibly inserted into the recess by the operating means, so that in an emergency, the valve can be closed even if the fluid pressure is normal.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

In this control valve, a flow path 2 is formed within a valve body 1, and a valve hole 3 is formed at right angles to the flow of a fluid such as city gas flowing within the flow path 2.

A first valve body 5 is provided toward the valve seat 4 on the downstream side of the valve hole 3, thereby forming a first valve means 6 for pressure regulation.

A second valve body 8 is provided toward the valve seat 7 on the upstream side of the valve hole 3, and a second valve means 9 for shutoff is configured.

The second valve body 8 is resiliently biased toward the valve seat 7 by a spring 10.

On the downstream side of the valve hole 3, the flow path 2 communicates with a diaphragm chamber 12 via a communication path 11.

A diaphragm 13 defining this diaphragm chamber 12 is biased toward the diaphragm chamber 12 by a spring 14 .

A spring chamber 15 in which the spring 14 is housed is communicated with the atmosphere through a through hole 16.

The diaphragm 13 responds to the difference between the pressure within the diaphragm chamber 12, that is, the pressure on the secondary side, and the spring force of the spring 14.
It is displaced up and down in FIG.

The first valve body 5 of the first valve means 6 is displaced in the axial direction of the valve hole 3 in accordance with the displacement of the diaphragm 13, thereby changing the opening degree of the valve hole 3 and adjusting the pressure on the secondary side. Ru.

Further, the second valve body 8 of the second valve means 9 is connected to the diaphragm chamber 12.
When the pressure inside the diaphragm chamber 12 is within a predetermined range, the second valve body 8 is moved away from the valve seat 7 to maintain the open state, and when the pressure inside the diaphragm chamber 12 is out of the pressure range, the second valve body 8 is moved away from the valve seat 7. 7, and the valve hole 3 is completely blocked.

A fitting hole 17 having the same axis is formed on the opposite side of the first valve body 5 from the valve hole 3 .

One end portion of the first valve rod 18 is slidably fitted into the fitting hole 17 .

The first valve rod 18 is guided so as to be freely displaceable in the axial direction of the first valve rod 18 along a guide hole 19 formed in the valve body 1 concentrically with the valve hole 3 .

At one end of the first valve stem 18, recesses 20 extending in the axial direction are formed at corresponding outer peripheral positions on one diameter line.

The first valve body 5 has pins 21 that fit into these recesses 20.
is installed.

Thereby, the relative movement of the first valve body 5 and the first valve rod 18 along the axis is limited to a range where the pin 21 abuts both ends of the recess 20 along the axis.

A spring 22 that biases the first valve rod 18 in a direction away from the first valve body 5 is housed in the fitting hole 17 .

A rack 23 is formed at the other end of the first valve rod 18 .

A lever 25 having a pinion 24 formed in an arc shape so as to mesh with the rack 23 is pivotally supported by a pin 26 perpendicular to the axis of the first valve rod 18 .

The lever 25 is rotatable around the pin 26 within a plane that includes the axis of the first valve stem 18, and the first valve stem 18 is displaced in the axial direction in response to the pivoting movement of the lever 250.

A drive shaft 27 is connected to the diaphragm 13 at right angles, and a hole 28 for holding the free end of the lever 25 is formed at the free end of the drive shaft 270.

This hole 28 narrows inward from the outside along the axis, and the lever 25 is held in point contact.

As the drive shaft 27 is displaced in the axial direction along with the displacement of the diaphragm 13, the lever 25 is rotated around the pin 26, and the first valve stem 18 is accordingly displaced in the axial direction.

A second valve rod 29 is fixed to the second valve body 8 and extends through the first valve rod 18 and the first valve body 5 so as to be freely displaceable in the axial direction.

One end of the second valve rod 29 movably penetrates the valve body 1 via a seal member 30, and extends through a recess 3 formed in the valve body 1.
It is highlighted as 1.

This recess 31 has an internal thread cut into it, and a cap 32 having an external thread that engages with the internal thread is screwed into the recess 31.

In order to prevent fluid from leaking from the sliding contact portion 33 between the first valve body 5 and the second valve stem 29, the first valve body 5 and the second valve body 8 surround the second valve stem 29. They are airtightly connected by a telescopic member 34.

This telescopic member 34 is freely telescopic along the axis of the second valve rod 29 .

At the other end of the second valve rod 29 facing the diaphragm chamber 12,
A follower 35 is rotatably supported around an axis parallel to the axis of the drive shaft 27 .

An external thread 36 is carved in the middle of the first drive shaft 27 mentioned above.

A sleeve 38 having an inner thread 37 that is threaded into the outer thread 36 is rotatably supported at both ends in the axial direction by the support portion 39 of the valve body 1, and is threaded onto the drive shaft 27.

The sleeve 38 is rotated around the axis in accordance with the displacement of the drive shaft 27 in the axial direction.

A first cam 50 is coaxially fixed to the sleeve 38, and a second cam 51 is loosely fitted into the sleeve 38 so as to be freely rotatable around the same axis.

In the state shown in the first figure, the follower 35 is in contact with the second cam 51.

FIG. 2 is a front view of the first cam 50.

This first cam 50 has two recesses 4 recessed radially inward.
0.41, and these recesses 40, 41 are formed at intervals in the circumferential direction.

Recess separation cam surfaces 42 and 43 are formed at positions close to each other in these two recesses 40 and 41, respectively, and extend radially inward in directions away from each other at angles α and β.

In this example, α − β, but in other examples, α
Peβ is also fine.

FIG. 3 is a front view of the second cam 51.

The second cam 51 is formed with two recesses 44 and 45 that are recessed inward in the radial direction, similar to the first cam 50 shown in the second diagram.

The recesses 44 and 45 are similar to the recesses 40 and 41 of the first cam 50.
For example, they are formed at equal intervals.

Recess fitting surfaces 46 and 47 extending radially inward in a direction close to each other are formed at positions adjacent to each other in these two recesses 40 and 41, respectively.

In FIG. 3, the recess-fitting surfaces 46, 47
10 are inclined at angles γ and δ in mutually proximal directions with respect to the radial direction.

In this example, γ-δ, but in other examples,
It may also be γ\δ.

The radius R1 of the circular arc surface 48 between the recesses 40 and 41 in the first cam 50 is less than the radius R2 of the circular arc surface 49 between the recesses 44 and 45 of the second cam 51 (R1<R2).

The second cam 51 is formed with a long hole 52 that extends in the circumferential direction symmetrically with respect to the axis of the second cam 51 .

The locking pin 53 that fits gently into the elongated hole 52 is connected to the first
It is installed upright on the cam 50.

In this way, the first cam 50 and the second cam 51 are connected to the elongated hole 52.
While the locking pin 53 is fitted into the long hole 52, relative angular displacement is allowed by an angle corresponding to the length of the elongated hole 52.

When the first cam 50 and the second cam 51 are at the extreme end position of their mutual angular displacement, the radially outer ends 46a, 47a of the recess-fitting surfaces 46, 47 of the second cam 51 recess 4
(a) Recessed release cam surface 4 so that it is at position 0,41.
The angle θ1 (see FIG. 2) that the radially outer ends 42a and 43a of 2.43 make with the rotational axis of the first cam 50, and (b
) Radial direction outer ends 46a, 4γ of recess fitting surfaces 46°47
The angle θ2 (see FIG. 3) that a forms with the rotational axis of the second cam 51, and (e) the mutual angular displacement allowable angle θ3 (see FIG. 3) between the first cam 50 and the second cam 51. As long as it is determined (the magnitude relationship between angles θ1 and 02 does not matter.

When the follower 35 is on the arcuate cam surface 49 of the second cam 510, the second valve body 8 is displaced to the left in FIG. 1 against the spring force of the spring 10 and separated from the valve seat 7. , the second valve means 9 is in an open state.

When the pressure on the secondary side, that is, the pressure inside the diaphragm chamber 12 is higher than the predetermined upper limit pressure, the follower 35 moves into the recesses 41, 4.
5, and when the pressure is below the lower limit pressure, the follower 35 fits into the recesses 40 and 44, and when these are fitted, the second valve body 8 is seated on the valve seat 7 by the spring force of the spring 10, and the second valve means 9
becomes closed.

When the follower 35 is on the arcuate cam surface 49 and the second valve means 9 is in the open state, when the pressure on the downstream side of the valve hole 3 increases,
The pressure in the diaphragm chamber 12 increases, so that the diaphragm 13 and the drive shaft 27 are displaced upward in FIG. It is rotated as shown in 61.

In response to this rotational movement of the lever 250, the first valve rod 18 and the first valve body 5 are displaced in a direction closer to the valve seat 4 of the valve hole 3.

As a result, the flow rate of the fluid flowing through the valve hole 3 is restricted,
The pressure in the diaphragm chamber 12, that is, the pressure on the secondary side, decreases and returns to the original pressure.

Further, when the pressure inside the diaphragm chamber 12 decreases, the diaphragm 13 and the drive rod 27 are displaced downward in FIG.
In response, lever 25 moves arrow 61 around pin 26.
is rotated in the opposite direction.

As a result, the first valve rod 18 and the first valve body 5 are displaced in a direction away from the valve seat 4, and the flow rate of fluid flowing through the valve hole 3 is increased accordingly.

Therefore, the pressure in the diaphragm chamber 12, that is, the pressure on the secondary side increases and returns to the original pressure.

As the drive shaft 27 is displaced upward in FIG. 1, the sleeve 38 and the first cam 50 are angularly displaced in the direction of the arrow 57 as shown in FIG. 4.

As a result, the locking pin 53 comes into contact with the front end 58 of the elongated hole 52 in the rotational direction 57, and accordingly, the second cam 5
1 is rotated in the same direction as arrow 57.

A state in which the locking pin 53 is in contact with the end 58 of the elongated hole 52 is shown in FIG. 4.

In this state, the recess fitting surface 47 is located at the rear of the recess exit cam surface 43 in the rotational direction 57, and the first cam 5
It is located at the position of the recess 41 of 0.

Therefore, as will be described below, it is ensured that the follower 35 will fit into the recesses 41 and 45 from the arcuate cam surface 49 through the recess fitting surface 47.

When the pressure in the diaphragm chamber 12 exceeds a predetermined upper limit pressure, the follower 35 moves the recess-fitting surface of the second cam 51 due to the radially inward spring force of the first cam 50 and the second cam 510 by the spring 10. 47 into recesses 45, 41.

At this time, the recess fitting surface 47 is further angularly displaced in the rotational direction 57 by the radially inward force of the follower 35,
The state shown in FIG. 42 is reached.

In the state shown in FIG. 4, in which the follower 35 is at the bottom of the recesses 41, 45, the second valve means 9 is in a closed state.

When the follower 35 retracts into the recess 41.45, the second cam 51 undergoes an angular displacement in the direction of rotation 57, while the first cam 50 remains stationary.

When the follower 35 reaches the bottom of the recesses 41 and 45, the locking pin 53 is attached to the rear end 5 of the elongated hole 52 along the rotation direction 57.
It is in contact with 9.

When the pressure in the diaphragm chamber 12 is between the upper limit pressure and the lower limit pressure, with the follower 35 fitted into the recesses 41 and 45, the cap 32 is removed and the second valve rod 29 in the recess 31 is removed. By pulling one end outward, the follower 35 moves radially outward along the recess detachment cam surface 43 and contacts the recess insertion surface 47, and sequentially moves the first cam 50 and the second cam 510 radially outward. The follower 35 has a circular arc cam surface 49.
reach.

In this way, in the second valve means 9, the second valve body 8 is connected to the valve seat 7.
The valve moves away from the valve and becomes open.

4, when the follower 35 is on the arcuate cam surface 49, when the pressure in the diaphragm chamber 12 is reduced and the diaphragm 13 and the drive shaft 27 are displaced downward in FIG. Cam 50 is angularly displaced in the direction of rotation indicated by dashed arrow 60.

Due to the angular displacement of the first cam 50 in the direction of the arrow 60, the locking pin 53 is moved to the front end 5 in the elongated hole 52 in the moving direction 60.
9, and accordingly, the second cam 51 rotates in the rotational direction 60.
is angularly displaced.

A state in which the locking pin 53 is in contact with the end 59 of the elongated hole 52 is shown in FIG. 4.

In this state, the recess fitting surface 46 of the recess 44 of the second cam 51 is located at the rear of the recess leaving cam surface 42 of the recess 40 of the first cam 50 in the rotational direction 60 .

When the pressure in the diaphragm chamber 12 reaches a predetermined lower limit pressure, the follower 35 moves from the arcuate cam surface 49 to the recess 40.44.
suddenly become immersed in.

As is clear from FIG. 3, the recess fitting surface 46 is arranged at an angle γ with respect to the radial direction of the second cam 510 in the rotational direction 60.
4, the follower 35 suddenly fits into the recess 40.degree. 44, resulting in the state shown in FIG. 4, and the second valve means 9 is abruptly closed.

When the pressure in the diaphragm chamber 12 is between the upper limit pressure and the lower limit pressure, with the follower 35 at the bottom of the recess 40° 44, the cap 32 is removed and the second valve rod 29 in the recess 31 is removed.
By pulling the one end outward, the follower 35 is displaced radially outward of the first cam 500 along the recess release cam surface 42, and eventually reaches the arcuate cam surface 49, as shown in FIG. The state will be as follows.

When the second cam 51 is at the front end in the rotational direction 60 than the first cam 50, the recess detachment cam surface 42 is connected to the recess insertion surface 46.
It suffices if it is located at the rear of the rotation direction 60 or flush with the recess fitting surface 46.

Further, when the second cam 51 is at the front end in the rotation direction 57 than the first cam 50, the recess detachment cam surface 43 is located at the rear of the recess fitting surface 47 in the rotation direction 57, or the recess It is sufficient if it is flush with the insertion surface 47.

Radial direction outer ends 46a, 47a of recess fitting surfaces 46, 47
In this case, the second cam 51 is rotated in a direction 57 more than the first cam 50,
When the follower 35 is located at the relatively front end of the recess 40, 41, the follower 35 is located 57°600 forward in the rotational direction than the recess release cam surface 42,43.
suddenly settles at the bottom of depression 40.41.

The bottom of the recess 40 of the first cam 50 is the recess 44 of the second cam 51.
The bottom of the recess 41 of the first cam 50 must be equal to or shallower than the bottom of the recess 45 of the second cam 51.

As another embodiment of the present invention, a locking pin 5 is attached to the second cam 51.
3 may be provided upright, and the elongated hole 52 may be formed in the first cam 50.

There may be two combinations of the elongated hole 52 and the locking pin 53 as in the illustrated embodiment, or there may be one combination in another embodiment.

Further, instead of the combination of the elongated hole 52 and the locking pin 53, another structure may be used that limits the allowable angle of mutual angular displacement between the first cam 50 and the second cam 51.

The first cam 50 and the second cam 51 may be generally circular as in the illustrated embodiment, or may have other shapes in other embodiments.

FIG. 5 is a sectional view of another embodiment of the present invention, and FIG.
Parts corresponding to the embodiment of FIG. 4 are given the same reference numerals.

In this embodiment, a planetary gear means 70 is provided in the middle of the drive shaft 27.
is mounted, and an operating means 72 for driving the ring gear TI of the planetary gear means 70 in angular displacement is provided.

By angularly displacing the ring gear 77 by this operating means 72, the follower 35 at the end of the second valve stem 29 is fitted into the recesses 40, 44 or 41, 45 of the first cam 50 and the second cam 51. , the second valve means 9 can be closed regardless of the pressure in the diaphragm chamber 12.

FIG. 6 shows the planetary gear means 70, the first cam 50, and the second cam 5.
1 and a drive shaft 27 in an exploded perspective view.

Sleeve 38 is secured to end plate 73 of planetary gear means 70.

Two pins 74 are fixed to the end plate 73, and two planetary gears 75 are pivotally supported by the pins 74.

A sun gear 76 is screwed into the external thread 36 in the middle of the drive shaft 27, and the sun gear 76 is rotationally driven by displacement of the drive rod 27 in the axial direction.

The ring gear 7γ having internal teeth that meshes with the planetary gear 75 is
It is loosely fitted into the boss portion 76a of the sun gear 76.

The sleeve 38 and the sun gear 76 are rotatably supported around the axis between support portions 78a and 78b formed in the valve body 1.

The sleeve 38 is inserted through the drive shaft 27 loosely, and the sleeve 38 can be freely angularly displaced relative to the drive shaft 27. There are no words that fit together.

FIG. 7 is a cross-sectional view taken along the section line ■--■ in FIG. 5.

The operating means 72 includes a plunger 79 that is freely displaceable on one diameter line of the ring gear 77, and a plunger 79 that connects the plunger 79 to the ring gear 7.
A spring 80 is biased toward the ring gear 77, and an electromagnetic coil 81 is configured to drive the plunger 79 in the axial direction. and a link 82 to be coupled.

When the electromagnetic coil 81 is excited, the plunger 7
9 is attracted to the right in FIG. 7 against the spring force of spring 80, thereby causing ring gear 77 to be angularly displaced about its axis.

As the pressure in the diaphragm chamber 12 changes, the diaphragm 13 moves upward or downward in FIG.

A drive shaft 27 is fixed to the diaphragm 13.

Therefore, the drive shaft 27 together with the diaphragm 13
Move the diagram up or down.

As a result, the sun gear 76 is rotated as shown in FIG. 90 or vice versa.

Plunger T9 stops rotation of ring gear 77.

Therefore, when sun gear 76 rotates in the direction of arrow 90, planet gear 75 rotates in the direction of arrow 91.

As a result, the end plate 73 supporting the planetary gear 75 is
Rotate in the direction of arrow 92.

The sleeve 38 is fixed to the end plate 73 and the first cam 50.

Therefore, when the end plate 73 rotates, the first cam 50 is rotated together with the end plate 73.

The subsequent operation is similar to that of the previous embodiment.

When the follower 35 is on the arcuate cam surface 49 and the electromagnetic coil 81 is excited and the plunger 79 is displaced to the right in FIG. 7, the ring gear 77 moves in the direction of arrow 93 as shown in FIG. Rotate in the direction.

Sun gear 76 is stationary.

In addition, in FIG. 8, the end plate 73 is simply shown for convenience of illustration.

As a result, the planetary gear 75 is angularly displaced in the direction of arrow 94, and the end plate 73 is accordingly angularly displaced in the direction of arrow 95.

This end plate 73 is fixed to the sleeve 38 and the first cam 50, so that the first cam 50 is angularly displaced clockwise in FIG.

For this purpose, the follower 35 is inserted into the recess 40.44.

This forces the second valve means 9 into the closed state.

As shown in FIG. 4 2 above (when the follower 35 is fitted into the recesses 41 and 45 and the pressure in the diaphragm chamber 12 is between the upper limit pressure and the lower limit pressure), the electromagnetic coil 81 is momentarily turned off. By energizing the plunger 7
9 is displaced to the right in FIG. 7 by an appropriate stroke, thereby displacing the ring gear 71 clockwise in FIG.
In response, the planetary gear 75 rotates clockwise in FIG.

As a result, the end plate 73 and the first cam 50 are angularly displaced in the direction of the arrow 60 in FIG.

This also allows the follower 35 in the recesses 41, 45 to
can be moved to the arcuate cam surface 49 of the second cam 510, and the second valve means 9 can be brought into an open state.

In this way, by angularly displacing the ring gear 77 of the planetary gear means 70 with the operating means 72, the diaphragm chamber 1
Regardless of the pressure inside 2, the second valve means 9 for shutoff can be closed.

As another embodiment of the invention, the first valve body 5 of the first valve means 6
The second valve body 8 of the second valve means 9 may be brought into contact with the valve seat 7 on the upstream side of the valve hole 3.

Further, the first valve stem 18 of the first valve body 5 may be inserted into the second valve stem 29 of the second valve body 8 so as to be freely displaceable in the axial direction.

Furthermore, a pilot pressure may be applied to the inside of the spring chamber 15 through the through hole 16.

In another embodiment of the invention, instead of providing two recesses in the first cam 50 and the second cam 51, only one recess 40, 44 or the other recess 41, 45 may be provided. .

In this way, the valve hole 3 can be shut off only when the pressure in the diaphragm chamber 12 is at either the upper limit pressure or the lower limit pressure.

As another embodiment of the present invention, the diaphragm chamber 12 may be communicated with the upstream side of the valve hole 3 to adjust the pressure upstream of the valve hole 3 to a constant value.

In each of the above-mentioned embodiments, the first valve means 6 has been described as regulating the pressure on the downstream side or upstream side of the valve hole 3. However, since the opening degree of the valve hole 3 is changed by the first valve means 6, Of course, the flow rate of the fluid can be adjusted by the first valve means 6.

As described above, according to the present invention, the opening degree of the valve hole is adjusted by displacing the first valve body in the axial direction of the valve hole in response to the pressure on the downstream side or upstream side of the valve hole, and the flow rate and the flow rate of the fluid are adjusted. The pressure can be adjusted constant.

Further, the follower fits into each recess of the first cam and the second cam when the pressure on the downstream side or upstream side of the valve hole is a predetermined upper limit pressure or lower limit pressure, and at this time, the recess fitting surface is the first cam and the second cam. The corresponding recess extends along the radially inward direction of the two cams to be equal to or even closer to each other than the exit cam surfaces, so that the follower engagement is abrupt and thus the second valve means can be shut off abruptly. becomes.

Therefore, unlike conventional governors, there is no need to separately provide a shutoff valve, and a control valve having a shutoff function can be constructed compactly.

Further, by using the planetary gear means and angularly displacing the ring gear by the operating means, the follower can be fitted into the recess regardless of the pressure value on the downstream or upstream side of the valve hole, and the second valve means can be inserted into the recess. The valve can be closed.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of the entire embodiment of the present invention, FIG. 2 is a front view of the first cam 50 of FIG. 1, and FIG. 3 is a front view of the first cam 50 of FIG.
A front view of the cam 51, FIG. 4 is a cross section line ■-■ of FIG. 1 to show the operating status of the first cam 50 and the second cam 51
5 is a sectional view of another embodiment of the present invention, and FIG. 6 is a sectional view of the planetary gear means 70, first cam 50, and
An exploded perspective view of the second cam 51 and the drive shaft 270, FIG. 7 is a sectional view taken along the section line ■-■ in FIG. 5, and FIG. 8 is a simplified diagram for explaining the operation of the planetary gear means 70. FIG. 1...-valve body, 2... flow path, 3...
...Valve hole, 5...First valve body, 6...
First valve means, 8... Second valve body, 9...
Second valve means, 10... Spring, 12...
Diaphragm chamber, 13...Diaphragm, 18
...First valve stem, 20...Second valve stem, 4
0,41.44゜45...-concavity, 42.43.
...Recess exit surface, 46° 47 ...Recess insertion surface, 49 ... Arc cam surface, 50 ...
First cam, 51... Second cam, 52...
・Long hole, 53... Locking pin, 70...
Planetary gear means, 72... Drive means, 75...
...Planet gear, 16...Sun gear, 77...
...Ring gear, 79...Plunger, 8
0... Spring, 81... Electromagnetic coil, 8
2...Ring.

Claims (1)

[Scope of Claims] 1. A valve body having a flow path with a valve hole in the middle, a first valve body displaceable in the axial direction on the upstream or downstream side of the valve hole, and adjusting the opening degree of the valve hole. a second valve means for closing the valve hole having a second valve body displaceable in the axial direction on the upstream side of the valve hole; It has an inward recess, and in the circumferential direction of the recess - in a good example,
a first cam having a recess release cam surface that is inclined toward the outer side in the circumferential direction along the radial inward side; and the recess-fitting surface of the recess is radially inwardly equal to or inclined in the circumferential direction of the corresponding recess-leaving cam surface; a second cam having an arcuate cam surface continuously formed at the radially outer end of the surface; a first valve rod extending toward the valve hole and having one end connected to the first valve body; downstream of the valve hole; or a means for displacing the first valve stem in the axial direction in response to pressure on the upstream side, the means being concentric with the first valve stem and movable in the mutual axial direction, and having one end connected to the second valve body; a second valve rod having a follower that can contact the cam surface at an end and receiving a spring force inward in the radial direction of the first cam and the second cam, and a downstream side or an upstream side of the valve; means for driving the first cam to an angular position corresponding to the pressure value, and the mutual allowable angular displacement between the first cam and the second cam is such that the follower is on the arc cam surface. and in a state where the first cam is at the extreme end position of mutual angular displacement with respect to the second cam, the radially outer end of the recess-fitting surface is selected to be in a range at the position of the recess of the first cam, The recess release cam surface is shaped to allow the first cam to move to the arcuate cam surface when the follower is removed from the recess, and the second valve means is in a closed state when the follower is inserted into the recess. 1. A control valve having a shutoff function, characterized in that the control valve is in an open state when it is on an arcuate cam surface. 2 A diaphragm chamber is formed in the valve body and communicates with a flow path on the downstream side or upstream side of the valve hole, and the first valve rod is displaced in the axial direction in accordance with the displacement of the diaphragm that defines the diaphragm chamber. A control valve having a shutoff function according to claim 1, wherein the first cam is angularly displaced. 3. The first cam has two recesses spaced apart in the circumferential direction of the first cam, and the second cam has two recesses spaced apart in the circumferential direction of the second cam. A control valve having a shutoff function according to claim 1, characterized in that: 4. A valve body having a flow path with a valve hole in the middle, a first valve means having a first valve body displaceable in the axial direction on the upstream or downstream side of the valve hole, and adjusting the opening degree of the valve hole. , a second valve means for closing the valve hole, which has a second valve body displaceable in the axial direction on the upstream side of the valve hole; in the circumferential direction of the recess - in a good example,
a first cam having a recess release cam surface that is inclined toward the other side in the circumferential direction along the radial inward direction; a recess that is recessed in the radial direction; and the recess-fitting surface of the recess is radially inwardly equal to the corresponding recess-leaving cam surface or inclined in the circumferential direction, and the recess-fitting surface is a second cam having an arcuate cam surface continuous to the radially outer end of the surface; a first valve rod extending toward the valve hole and having one end connected to the first valve body; downstream or upstream of the valve hole; means for displacing the first valve stem in the axial direction in response to pressure on the side, the means being concentric with the first valve stem and movable in the mutual axial direction, one end being connected to the second valve body and the other end being displaceable in the axial direction; has a follower that can contact each of the cam surfaces and is applied with a radially inward spring force of the first cam and the second cam, and a second valve stem on the downstream or upstream side of the valve. It includes means for responding to pressure and driving the first cam by angular displacement to an angular position corresponding to the pressure value, and the mutual allowable angular displacement between the first cam and the second cam is such that the follower is on the arcuate cam surface and with the first cam being at the extreme end position of their mutual angular displacement with respect to the second cam, the radially outer end of the recess-fitting surface is selected to be in the position of the recess of the first cam; The disengagement cam surface is shaped to allow the first cam to move to the arcuate cam surface when the follower is disengaged from the recess, and the second valve means is in a closed state when the follower is inserted into the recess. There is a planetary gear that revolves in conjunction with the first cam, and a sun that is connected with the same axis as the first cam and drives the first cam by angular displacement. A control having a blocking function, characterized in that it includes a planetary gear means having a gear and a ring gear, and an operation means for angularly displacing the ring gear of the planetary gear means to force a follower on an arcuate cam surface into a recess. valve. 5. The operating means includes a plunger pin-coupled to the ring gear at a position offset from its axis, and a coil for displacing the plunger by electromagnetic force. A control valve with a shutoff function. 6. The first cam has two recesses spaced apart in the circumferential direction of the first cam, and the second cam has two recesses spaced apart in the circumferential direction of the second cam. A control valve having a shutoff function according to claim 4.