JP2609692B2 - Reciprocating stop valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to, for example, an outlet provided in a bottom wall of a tank for taking out a stored liquid in a tank (the outlet is a cleaning liquid discharge port for residue). The present invention also relates to a reciprocating stop valve to be mounted on a valve.

[Conventional technology]

 FIG. 4 shows a conventional reciprocating stop valve of this type.

That is, the reciprocating stop valve 1 includes a valve seat 2a, a flange portion 2b,
Packing box 2c for storing packing 5, packing retainer 6
Valve drive such as an air cylinder 4 having a valve body A comprising a valve box 2 having a valve body 3 and a valve rod 3a having a valve body 3, and a rod 4a connected in series with a free end (lower end) of the valve rod 3a. Device B
And consists of

The valve stem driving device B is attached to the valve box 2 by the bolt 7 and the nut 8 together with the packing retainer 6.

In the reciprocating stop valve 1 having the above structure, the flange portion 2b formed on the valve box 2 is attached to a flange portion 9a formed on the outer periphery of an outlet provided on the bottom wall of the tank 9, for example, with a bolt and a nut. .

Then, the valve seat 2a is opened and closed by the valve body 3 of the valve rod 3a that reciprocates together with the rod 4a by the operation of the valve rod drive device B, and the necessary liquid is stored in the tank 9 and the stored liquid is taken out to another. is there.

In addition, the discharge of the residue cleaning liquid in the tank 9 is performed by opening the valve seat 2a.

[Problems to be Solved by the Invention]

As described above, in the conventional reciprocating stop valve 1,
A valve rod in which the valve rod 3a of the valve body A and the rod 4a of the valve rod driving device B are connected in series, and the valve seat 2a reciprocates together with the rod 4a.
(A) As described above, when the liquid is stored in the tank 9 in the closed state, the sealing between the valve seat 2a and the valve body 3 may be reduced. , If the sealing of the packing 5 with respect to the valve rod 3a decreases, the leaked liquid from the valve seat 2a travels through the valve rod 3a, passes through the packing 5, and travels through the rod 4a to the air cylinder 4. May reach.

In particular, when the storage liquid is a corrosive liquid, the packing 5 is damaged, and the sliding portion between the air cylinder 4 and the rod 4a (the opening of the air cylinder 4 and the outer periphery of the rod 4a that advances and retreats through the opening). Alternatively, corrosion occurs in the sliding portion between the inner wall of the air cylinder 4 and the piston of the rod 4a, and the rod 4a
Since the reciprocating movement of 1 is lacking in smoothness and the opening and closing of the valve body 3 with respect to the valve seat 2a and the sealing degree are poor, the packing 5 needs to be replaced, and the valve rod drive device B must be replaced. There was a problem that did not become.

(B) The decrease in the degree of sealing of the packing 5 with respect to the valve rod 3a
In the case of taking out the liquid from the tank 9 or discharging the residual cleaning liquid, there was the same problem as in the above (a).

(C) The valve rod driving device B is connected to the valve body A such that a small interval corresponding to the stroke of the valve element 3 required for opening and closing the valve seat 2a is interposed between the packing presser 6 and the air cylinder 4. Therefore, there is a problem that the valve stem driving device B must be removed even when only the packing 5 needs to be replaced.

That is, even if the connection between the valve stem 3a and the rod 4a is disconnected and the packing presser 6 is removed from the lower end along the bolt 7 by removing the fixing nut 8, the packing 5 is removed from the lower end of the valve stem 3a, Even if it is impossible or possible to insert a new product, it is extremely troublesome (the valve stem 3a is pushed up), so the valve stem driving device B is also removed.

The present invention has been made in view of the above-described problems of the related art, and even if a leak occurs due to a reduction in the degree of sealing between the valve body and the valve seat, the degree of sealing between the packing and the valve rod, the problem is not solved. It is an object of the present invention to provide a reciprocating stop valve in which liquid leakage does not propagate to a valve shaft driving device.

[Means for Solving the Problems]

In order to achieve the above object, in the reciprocating stop valve of the present invention, the valve body and the valve stem drive device are arranged in parallel.

That is, a valve body having a reciprocating valve stem, a valve stem driving device arranged in parallel with the valve body and having a reciprocating rod, and a valve body extending from the free end of the rod in each of the closed and open states. It comprises a connecting member for connecting the free end of the protruding valve stem and the free end of the rod.

The connecting member is composed of a block portion fixed to the free end of the rod and a pair of parallel arm portions extending from the block portion and holding the free end of the valve rod, or the free end of the rod. And a pair of rotatable parallel arms pivotally attached to the free end of the valve stem through a slot.

Furthermore, the valve rod drive device uses air cylinders and piston rods, hydraulic cylinders and piston rods, electromagnetic solenoids and plunger rods, etc. as appropriate, and the bottom wall of the valve rod drive device is mounted on a bracket protruding from the outer wall of the valve body. Install and install in parallel with the valve body.

[Action]

For example, a valve stem of a valve body attached to a storage liquid outlet of a tank bottom wall is connected to a valve stem driving device (parallel to the valve stem reciprocating operation line). By operating a valve stem driving device disposed so as to reciprocate the wire, the valve is reciprocated through a connecting member to open and close the valve seat, to store the liquid in the tank, to take out the liquid, and to discharge the residue cleaning liquid. And do.

In the closed state, the leakage generated when the sealing degree between the valve seat and the valve body and the sealing degree between the packing and the valve rod are reduced coexists, and the liquid leaks down through the valve rod and drops at the free end. However, since the free end of the valve stem extends (is at the lower level) from the free end of the rod of the valve stem drive device, the liquid leakage travels through the connecting member inclined upward to the free end side of the rod. It does not propagate to the drive.

Further, when the stored liquid is taken out and the residual cleaning liquid is discharged, even if there is a leak due to a decrease in the degree of sealing between the packing and the valve rod, it does not propagate to the valve rod drive device as described above.

Since the stem drive is arranged in parallel with the valve body,
By removing the connection between the valve rod and the connecting member and removing the packing retainer from the packing box, the packing can be easily replaced (extracting the old product and inserting a new product) from the free end of the valve shaft.

〔Example〕

 Examples will be described with reference to the drawings.

The same parts as those in the conventional example are denoted by the same reference numerals, and an example in which the parts are attached to the outlet of the tank bottom wall will be described.

As shown in FIG. 1, the valve body A of the reciprocating stop valve 20 is the same as that of the conventional example shown in FIG. 4, and a packing box portion 2c containing a valve seat 2a, a flange portion 2b, and a packing 5, It comprises a valve box 2 having a packing presser 6 and a valve body 3 having a reciprocating valve rod 3a.

The valve stem driving device B is the same as the conventional example in a certain point from the air cylinder 4 having the reciprocating rod 4a, but the valve stem driving device B is arranged in parallel with the valve body A in the present invention.

That is, the valve rod drive unit B is attached to the bracket 21 fixedly inserted between the lower surface of the packing box portion 2c of the valve box 2 and the packing retainer 6.
The bottom wall of the air cylinder 4 is attached, and the reciprocating operation line of the rod 4a is deviated in parallel with the reciprocating line of the valve stem 3a.

The bracket 21 is formed with a stepped portion 21a in which the mounting portion of the device B is set to a slightly higher position so that the leaked liquid does not reach the valve stem driving device B.

Thus, the free end (lower end) of the valve rod 3a is set so as to extend from the free end (lower end) of the rod 4a in both the closed and open states, and connects the two free ends. Connecting member
22 is inclined so that the connecting side with the rod 4a is at a high position and the connecting side with the valve rod 3a is at a low position, and the liquid leaking down through the valve rod 3a is transmitted through the connecting member 22 and the valve rod drive device. It does not propagate to B.

The connecting member 22 includes a block 22a screwed and fixed to the free end of the rod 4a, and a pair of parallel arms 22b extending from the block 22a and holding the free end of the valve stem 3a. It is configured.

In this embodiment, the valve drive B is an air cylinder 4
However, the present invention is not limited to this, and a hydraulic cylinder and a piston rod or an electromagnetic solenoid and a plunger rod are also used as appropriate. A type that supplies oil, an electric current, or a type that supplies the drive medium for both valve closing and valve opening is appropriately used.

The connecting member 22 is not limited to the above-described embodiment, but as shown in FIG. 2, a pair of arms which can pivot about a central portion of a bracket 23 provided on the cylinder 4 of the valve rod driving device B. Department
One end of 22b is pivotally attached to a pin provided at the free end of rod 4a,
A pin provided at the free end of the valve stem 3a may be inserted into the elongated hole 22c formed at the other end. However, in this case,
The reciprocating direction of the rod 4a for opening the valve is opposite to that in the embodiment of FIG.

FIG. 3 shows another embodiment of mounting the valve stem driving device B. The valve stem driving device B is mounted on the bracket 24 projecting (by welding or the like) on the outer wall of the valve casing 2 above the packing box portion 2c. The bottom wall of the cylinder 4 is attached, and in this case, the step portion 21a of the bracket 21 of the embodiment shown in FIG.
There is no need for a means for preventing liquid leakage propagation.

〔The invention's effect〕

The present invention has a valve body and a valve stem drive device arranged in parallel,
Since the free end of the valve rod that connects the connecting members is set to extend from the free end of the rod, (a) Even if a leak from the valve seat or packing occurs in the valve rod, Propagation to the rod drive can be prevented and thus the valve rod drive is more durable.

(B) There is no accessory below the packing retainer of the valve body, there is a wide space, and by disconnecting the connecting member at the free end of the valve rod and disconnecting the packing retainer from the packing box, The packing can be pulled out from the free end of the valve rod and a new one can be inserted, and the packing can be replaced very easily without removing the valve rod drive device.

(C) A stop valve having a short length in the vertical direction, for example,
When mounting on the bottom wall of a tank, etc., the mounting space below the bottom wall can be saved.

The reciprocating stop valve of the present invention can be used not only for mounting on a bottom wall of a tank or the like, but also for mounting a branch pipe in the middle of piping.

[Brief description of the drawings]

1 is a front view, partially in vertical section, of a reciprocating stop valve, FIG. 2 is an explanatory view of a main part showing another embodiment of a connecting member, and FIG. 3 is another embodiment of mounting a valve stem driving device. FIG. 4 is a partial vertical sectional front view of a conventional reciprocating stop valve. 20 Reciprocating stop valve A A Valve body 2 Valve box 2a Valve seat 2b Flange section 2c Packing box section 3 Valve body 3a Valve Rod, 5 ... packing, 6 ... packing presser, B ... valve stem drive, 4 ... cylinder, 4a ... rod, 21 ... bracket, 10a ... step, 22 ... connecting member, 22a ... … Block, 22b …… arm, 22c …… long hole, 23,24 …… bracket.

Claims (5)

(57) [Claims] 1. A valve body having a reciprocating valve stem, a valve driving device disposed in parallel with the valve body and having a reciprocating rod, and a rod free in each of a closed state and an open state. A reciprocating stop valve comprising a free end of a valve stem extending from an end and a connecting member connecting a free end of the rod. 2. The connecting member comprises a block portion fixed to the free end of the rod, and a pair of parallel arm portions extending from the block portion and holding the free end of the valve rod. The described reciprocating stop valve. 3. The reciprocating device according to claim 1, wherein the connecting member comprises a pair of rotatable parallel arms pivotally connected to the free end of the rod and to the free end of the valve stem through an elongated hole. Dynamic stop valve. 4. The reciprocating stop valve according to claim 1, wherein the valve stem driving device has a bottom wall attached to a bracket protruding from an outer wall of a valve body of the valve body and arranged in parallel with the valve body. 5. The valve stem driving device comprises an air cylinder and a piston rod or a hydraulic cylinder and a piston rod or an electrode solenoid and a plunger rod.
The described reciprocating stop valve.