JPH0228302Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is attached to various fluid storage facilities, pipelines, etc., and can be used in the event of an emergency such as an earthquake, fire, or equipment failure in these facilities. This invention relates to the improvement of an emergency operating valve that rapidly shuts off or opens fluid to prevent disasters. [Prior Art] Emergency operating valves are important equipment indispensable for disaster prevention in facilities that handle dangerous fluids such as highly flammable and toxic, and are particularly required to have reliable operating functions. Emergency actuation valves that have been widely used in the past are:
The stem (valve rod), which is integrally equipped with a valve body, is moved in the opposite direction of operation by a driving part such as a screw and is latched, and in an emergency, it can be released and stored. This is a type that operates rapidly using the repulsive force of a spring. In addition, unlike this, when operating, the valve body does not move up and down, but only the valve body is operated.
No. 37-5341 (Name of invention [tank refueling valve])
There is something shown in According to this, the stem and valve body are not integrated,
A connecting rod that can be raised and lowered together with the stem extends downwardly through the valve body, and the connecting rod and the valve body are configured to be removable. Normally, the valve body is linked with the stem to open and close the tank from above. If it is necessary to quickly stop the oil supply when the valve is in the open state, the valve body rotates the connecting rod using the operating rod at the lower end of the valve body to release the connection between the stem and the valve body. It is designed to sit down with the elasticity of a spring and close the oil supply path. [Problems to be solved by the invention] In the former general type of emergency operating valve, the stem that moves up and down must slide within the shaft sealing part in order to open and close the valve. This shaft sealing part has an important function of isolating the fluid from the outside air, and is a part of the general valve structure where many troubles occur, and is the most troublesome problem for those skilled in the art. Since it is a seal for a moving body, strong sliding contact is required between the stem and the packing, and therefore the frictional resistance is large, and a large thrust force is required to move the stem up and down. Normally, when opening and closing a valve, the driving part generates a forced thrust such as a screw thread, so even if the resistance of the shaft sealing part is large, the stem can move up and down, and there is no problem in sealing it. Ta. However, the thrust of the stem for operation is based on the assumption that the supply of electric power and pressure to the operating equipment will be completely stopped under emergency conditions, and that these are not used as the operating source, and the thrust of the stem is determined by the elasticity of the spring and this. Even if the stored repulsive force of the spring is released, it is often blocked by the resistance of the shaft seal and becomes inoperable. , which was extremely dangerous in terms of disaster prevention. In the latter type, the stem moves up and down the shaft seal during normal valve opening and closing, and rapid occlusion causes only the valve body to operate, regardless of stem movement. No troubles with operating functions will occur due to this. In the former type of emergency operation valve, a drive unit that controls the opening and closing of the valve body and an operation member for starting the emergency operation are provided close to one side (often on the upper side) of the valve body. Naturally, this is because not only the individual operations but also the related operations of both are easy to perform, there is no risk of erroneous operation, and maintenance and inspection are easy. In the latter case, the opening and closing of the valve is performed at a separate location above the tank, while the rapid closing operation is performed on the ground below the tank. This is a natural consequence of the fact that the purpose of the invention is limited to (tank refueling valve). However, if this type is used as a general-purpose emergency valve like the former, both operating members must be placed separately at the top and bottom of the valve body, making it extremely difficult to handle. In addition to the stem, there is also a
The operating rod that connects and disconnects the valve body and the connecting rod also requires a shaft sealing part. As already mentioned, the problematic moving shaft seal is
It must be minimized as much as possible. Regardless of conditions such as oil supply, where room temperature and low pressure conditions are good, medium and high pressure shaft seals have a complex structure, require a large amount of space, and are not easy to maintain. This is especially true if the two shaft sealing parts are vertically separated. Furthermore, since a considerable amount of space is required below the valve body, installation locations are restricted, and it becomes complicated to cover with heat insulating material. The present invention takes the above-mentioned conventional problems into account and provides an emergency operating valve that maintains stable function without complicating the structure. [Means for Solving the Problems] In order to achieve the above object, this invention provides a stem that ascends and descends without being restricted in rotation, an operating means for rotating this stem, and a stem within a valve body. A valve body is provided with a valve body that is disposed below and is movable up and down without rotation and that correlates with the valve seat, and a latch provided on both the valve body and the stem are mutually fixed. The emergency operation valve is provided with a latching means that engages to prevent the valve body from moving in the operating direction at a rotational position and releases this engagement at another rotational position. [Example] Examples will be described below with reference to the drawings. FIG. 1a is a longitudinal sectional view of the present invention, showing an embodiment in which the valve is closed in the operating direction. The inlet, outlet and connection means on both sides of the valve body 1 are omitted and not shown. 2 is a primary valve chamber that communicates with the right inlet, 3 is a secondary valve chamber that communicates with the left outlet,
4 is a valve seat provided on a partition wall that partitions both valve chambers 2 and 3; 5 is a valve body 6 facing the valve seat 4; FIGS. ) As shown in ), the valve guide 7 has a prismatic shape on the outside (regular hexagon in the figure).
8 is a cover that closes the upper opening of the valve body 1 and is sealed in a sealed manner; 9 is a guide tube that protrudes from the center of the lower side of the cover 8, and is directed downward. A guide hole 10 is formed at the open end of the valve guide 7, and the guide hole 10 matches the outside of the prismatic shape of the gas cylinder 7, and the valve guide 7 is fitted in the guide cylinder 9 so as to be able to move up and down without rotating. A coil spring 11 is inserted between the cover 8 and the valve body 6, and presses the valve body 6 in the seating direction. 12 is a shaft sealing part 13 (shown is a gland backing, 14 is a tightening tool) fitted into a through hole in the center of the cover 8 to pass through the valve body 1.
A stem (valve rod) protrudes outward; 15 is an engagement shaft portion in which a part of the upper part of the stem is cut into a prismatic shape (a regular square prism in the figure); 16 is a stepped portion on the top of the engagement shaft portion 15; It has a small diameter part with a narrow outer diameter, and a thread is carved into the upper end. 17 has a screw carved on the outer surface,
A drive screw with a through hole drilled in the axial direction is loosely fitted into the narrow diameter portion 16 of the stem 12, and thrust rings 18, 19 (preferably low friction elements such as thrust ball bearings) are interposed on the upper and lower sides. It is rotatably mounted (relative to the stem 12) with a screw at the upper end. 20 are two upright pillars embedded in the cover 8 (the right side is only the center line, not shown),
A yoke 21 is fixed to the upper end. A female thread 22 is cut into the center of the yoke 21, into which the drive screw 17 is screwed, and is moved up and down together with the stem 12 by rotation of a handle 23 fixed thereto. 24 is a support plate fixed to the support column 20, 25 is a rotation sleeve loosely fitted in a through hole in the center of this support plate 24, and the support plate 24 is sandwiched between it and an operating lever 26 fitted to this. It is installed. As shown in FIG. 1b (BB sectional view in FIG. 1a), inside the rotating sleeve 25,
An engagement hole 27 is formed that matches the cross section of the engagement shaft portion 15 of the stem 12, and the engagement shaft portion is inserted therethrough so as to be slidable up and down. The operating lever 26 is fixed to the rotating sleeve 25 by a set screw 28, and rotates the stem 12 by rotating through a limited angle θ as shown in FIG. 1b. 29 is a stopper for the operating lever 26, and the support column 20 serves as a stopper in the right direction. Further, numeral 30 is a removable latch that securely holds the operating lever at position A between it and the stopper 29. Reference numeral 31 denotes a reverse seat flange provided on the stem 12 that protrudes into the valve body 1 , and is correlated with a reverse seat 32 in which a highly slippery material such as Teflon is placed on the underside of the cover 8. Reference numeral 33 denotes a cervical shaft portion where the lower part of the reverse seat flange 31 is tapered in a stepped manner, and 34, 34... refer to the outer periphery as shown in Fig. 2 (perspective view of the lower part of the stem 12) and Figs. 3a and 3b. This is a plurality of (four in the figure) hanging elements formed into parallel protrusions along the axis and having engaging surfaces 35, 35, . At the upper center of the valve guide 7 is the stem 12.
A cervical shaft hole 36 is bored into which the cervical shaft part 33 of the stem 12 fits, and its lower inside is expanded in diameter in a stepwise manner, and the hanging joints 34, 34 of the stem 12 are freely inserted between it and the back surface of the valve body 6. A vacant room 37 is formed that can be stored with a gap. As shown in FIGS. 3a and 3b, around the cervical shaft hole 36, there are provided the suspension insulators 34, 34, 34, .
The same number of vertical grooves 3 with a shape corresponding to the cross section of 34...
8, 38... are cut out, and the engaging surface 3 is protruded on the lower side.
Hole hooks 40, 40... having holes 9, 39... are formed. The relationship between the shaft hooks 34, 34... and the hole hooks 40, 40... in FIG. 1a match as shown in FIG. is in a state of At this time, the operating lever 26 is fixed to the rotating sleeve 25 by the set screw 28 at the position A shown by the solid line in FIG. 1b. Next, when the operating lever 26 is rotated 45 degrees to the right and moved to the position where it hits the support column 20, that is, the position B shown by the imaginary line, the suspension joints 34, 34... are moved as shown in Fig. 3b. so that they fit into the grooves 38, 38, and can pass in the axial direction. The above is the configuration of this device, and the operation will be described next. First, the valve closing operation will be explained with reference to FIG. When fluid is introduced into the valve body 1 , the valve body 6 closes the valve seat 4 and the valve is closed. For normal fluid supply, first handle 2
3 to the left, the drive screw 17 spirals and rises together with the stem 12. The rising stem 12 is restricted by the rotating sleeve 25 fixed to the operating lever 26 and does not rotate, but the shaft engaging members 34, 34... and the hole engaging members 40, 40... engage with each other, so that the valve body 5 together, the reverse seat flange 31 comes into contact with the reverse seat 32 (the upper side of the valve guide and (The cover 8 is designed to have a gap between it and the lower side of the cover 8) and is fully opened, allowing the entire amount to flow through. If an emergency occurs while fluid is being supplied at full throttle as described above and the fluid is rapidly shut off, the latch 30
When the lever 26 is turned to position B, the stem 12 is rotated by 45 degrees, and both the latch members 34 and 40 are disengaged (relationship shown in Fig. 3b), and the valve body 5 is moved by the coil spring. FIG. 6b shows a state in which the valve body 5 is actuated and seated by the repulsive force of 11 to shut off the fluid. Primary pressure acts on the back side of the seated valve body 6, which applies pressure contact with the valve seat 4 to further ensure sealing, but there is a risk that the system fluid will flow back during post-processing of an emergency situation. If so, rotate the handle 23 clockwise to lower the stem 12 and remove the valve body 6.
All you have to do is tighten it. To open the valve again to supply fluid, keep the operating lever 26 in position B, rotate the handle 23 clockwise, and lower the stem 12 until the valve body 6 is closed as described above. , 34... can be rotated within the empty chamber 37, the operating lever 26 is returned to the position A, and the state shown in FIG. To open and close the valve in normal situations other than emergencies, use operating lever 2.
6 at position A and raise/lower the stem 12 by operating the handle 23, it becomes a general stop valve (open/close valve).
It also functions as a. Note that when the stem 12 is close to vertical, the valve body 1
is attached, the valve body 5 can be operated by its own weight and back pressure, so there is no problem even if the coil spring 11 is removed. FIG. 4 is a cross-sectional view showing a different embodiment of the hanging element 34 of the stem 12 from the above-mentioned example. An appropriate number (related to the rotation range θ of the operation lever 26 for operation) can be selected. The hole hooks 40 of the valve guide 7 are also changed to corresponding numbers. FIG. 5 is a partial longitudinal cross-sectional view of a main part inside the valve body 1 showing another embodiment in which the shafting element 34 is shortened and the hole engaging element of the valve guide 7 is formed long. Next, an embodiment in which the direction of operation is in the open direction will be described. FIG. 7 is a vertical sectional view of the internal part of the valve body 1 in an embodiment of the valve opening operation opposite to that shown in FIG.
The relationship between the guide tube 9 and the guide tube 9, and the structure above the cover 8 (not shown) are the same as those in FIGS. 1A and 1B. However, the direction of fluid inflow is reversed, with the primary valve chamber 2 below the valve seat 4 and the secondary valve chamber above. The stem 12 does not have a reverse seat tsuba 31, and the shankakugoko 3
4, 34... have the same cross section as in FIG. The hole hooks 40, 40, . . . inside the valve guide 7 also have the same cross section as shown in FIG. The upper part of the hole hook 40 of the valve guide 7 is connected to the shaft hooks 34, 34 of the stem 12.
A cavity 42 is provided to rotatably accommodate the..., and a ring nut 41 is screwed into the opening. The relationship between the shaft hooks 34, 34, . . . and the hole hooks 40, 40, . . . in FIG. At this time, the operating lever 26 is at position A. Further, when the operating lever 26 is moved to position B, both of the engaging surfaces 35 and 39 are removed, resulting in the same state as shown in FIG. 3b. Next, the action of this valve opening operation will be explained. FIG. 6 shows the hanging brackets 34, 34, . . . as described above.
The engaging surfaces 35, 35... at the lower ends of the holes, the hole engaging pieces 40,
The engagement surfaces 39, 39... at the upper ends of the valve body 40 are engaged with each other, and the thrust of the stem 12 presses the valve body 6 against the valve seat 4 to shut off fluid. When it is necessary to open the system fluid to prevent harm, when the operating lever 26 is rotated from A to B, the engagement surfaces 35 and 39 of both the shaft and the hole are released, and the valve body 5 is opened from below. The valve body 6 is pushed up by the fluid and fully opens until the back surface of the valve body 6 touches the lower end of the stem 12, releasing the fluid. To close the valve body 6 again, raise the stem 12 until the upper side of the valve guide 7 contacts the lower side of the cover 8, return the operating lever 26 to position A, and align the shaft and hole engaging surfaces 35 and 39. After engaging, the stem 12 is lowered and the valve body 6 is seated and pressed. The above is an embodiment of the present invention, but the method of engaging the stem 12 and the valve body 5 (or the valve body 6) is as follows.
It is determined by carefully considering various conditions such as the valve diameter, fluid pressure, temperature, and direction of operation, but any suitable means other than those listed in the text can be adopted. Further, the driving and operating operation of the stem 12 is not limited to manual operation, and it is also possible to employ automatic devices such as pressure-operated elements such as power cylinders and diaphragms, and electric drives. To start the operation, various known methods can be used, such as receiving the operating lever 26 biased by the tension of a spring with a latch 30 and releasing the latch 30 by remote control. [Effects of the invention] Since this invention has the above-mentioned structure and function, it exhibits the following effects. A. The structure is simple. Since the stem 12 has the functions of opening and closing the valve body 6 and activating the emergency operation, there is no need to add a moving shaft sealing part 13, which is a complicated and problematic component, and the valve body 1 is not of a special type. Since general standard products can be used, manufacturing is easy and low cost. B. Operation is reliable. During operation, the stem 12 does not move up and down, so the frictional resistance of the shaft sealing part 13 does not become an obstacle, and the valve body 5
operates reliably with extremely small thrust. C. It is easy to start up. Activation involves rotating the stem 12 rather than moving it up and down, so there is little resistance. In addition, since the rotation angle of the operating lever 26 can be narrowed (the more the number of shafts 34 shown in Fig. 4, the smaller the angle is, 30 degrees for 6 threads), less input is required, and activation can be performed using the repulsive force of the spring. Suitable for devices, etc. D. There is no erroneous operation. Since the driving part and the operating lever 26 are arranged close to each other on the same side, the normal opening/closing operation is no different from the conventional one, and the engagement between the valve body 5 and the stem 12 is controlled depending on the position of the operating lever 26. , release can be confirmed, and related operations such as activation and restoration can be performed without mistakes.

[Brief explanation of drawings]

FIG. 1a is a longitudinal sectional view of the present invention, with some parts omitted. Fig. 1b is a sectional view taken along line B-B in Fig. 1a, Fig. 2 is a perspective view of the lower part of the stem 12, and Figs. 3a and 3b are sectional views taken along line A-A in Fig. The interlocking relationship with the interlocking child 40 is shown. Figure 4 shows stem 12
FIG. 5 is a cross-sectional view showing an embodiment of the shaft holder 34, and FIG. 5 is a partial longitudinal sectional view of the internal part of the valve body 1 showing another embodiment of the shaft holder 34 and the hole holder 40. FIG. 6a 7b is a vertical cross-sectional view of the inner part of the valve body 1 showing the operating state, and FIG. 7 is a partial vertical cross-sectional view of an embodiment of the valve opening operation. 1 is a valve body, 4 is a valve seat, 5 is a valve body, 6 is a valve body, 7 is a valve guide, 12 is a stem, 13 is a shaft sealing portion, 17 is a drive screw, 25 is a rotating sleeve, 26
Reference numeral denotes an operating lever, numeral 34 denotes a shaft hook, and numeral 40 denotes a hole hook.

Claims (1)

[Scope of utility model registration request] A stem that is raised and lowered by a drive unit without being restricted in rotation, an operating means that rotates the stem, and a valve seat that is disposed below the stem within the valve body and is movable up and down without rotation. A valve body having a valve body correlated with the valve body, and a catch provided on both the valve body and the stem mutually prevent movement of the valve body in the operating direction at a certain rotational position. An emergency operating valve equipped with a latching means that engages in one direction and releases the engagement at another rotational position.