JPH0238781A - Reciprocating type stop valve - Google Patents

Abstract

PURPOSE:To improve the service life of a valve rod driver in a reciprocating type stop valve mounted at an opening for introducing out liquid stored in a tank or the like by disposing a valve body and a valve rod driving device parallely, and extending the free end of the valve rod connecting a connection member from the free end of a rod. CONSTITUTION:A valve body A and a valve rod driver B are disposed parallely, while the free end of valve rod 3a is extended from the free end of rod 4a, then both the free end are connected with a connection member 22. It is thus possible to prevent the influence onto the device even if leakage along the rod 3a occurs from a packing and to improve the service life of the device B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an outlet that is formed in the bottom wall of a tank to take out the liquid stored in the tank (the outlet is a cleaning liquid outlet for residual cleaning liquid). Regarding reciprocating type stop valves that can be installed in

[Conventional technology]

A conventional reciprocating stop valve of this type is shown in FIG.

That is, the reciprocating stop valve 1 includes a valve seat 2a, a flange portion 2b
, a valve body A consisting of a valve body 2 having a gasket whistle part 2G for storing a gasket 5, a gasket retainer 6, and a valve stem 3a having a valve body 3; It consists of a valve rod drive device B such as an air cylinder 4 having a connected rod 4a.

Therefore, the above-mentioned valve stem drive system r! IB is attached to the valve box 2 together with a packing retainer 6 by bolts 7 and nuts 8.

The reciprocating type stop valve 1 having the above configuration has seven flange portions 2b formed on the valve box 2, and 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, by bolts and nuts. .

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

Note that the residual cleaning liquid in the tank 9 is discharged by opening the valve seat 2a.

[Problem to be solved by the invention]

As mentioned above, in the conventional reciprocating type stop valve 1, the valve stem 3a of the valve body A and the rod 4a of the valve stem driving device MB are connected in series, and the valve seat 2a reciprocates together with the rod 4a. Since the valve is opened and closed by the moving valve stem 3a, (a) As mentioned above, when the valve is in the open state where liquid is stored in the tank 9, the valve seat 2a and the valve body 3 should be sealed tightly. If the degree of sealing of the seal 5 with respect to the valve stem 3a coexists, the liquid leaking from the valve seat 2a will travel along the valve body 3a, pass through the seal 5, and then travel along the rod 4a. Air cylinder 4 may be reached.

In particular, if the storage liquid is a corrosive liquid, Packin 5
Damage to the sliding part between the air cylinder 4 and the rod 4a (
Corrosion occurs in the opening of the air cylinder 4 and the outer periphery of the rod 4a that moves forward and backward through the opening, or in the sliding portion between the inner wall of the air cylinder 4 and the piston of the rod 4a, causing a lack of smoothness in the reciprocating movement of the rod 4a. Since the opening/closing and sealing of the valve body 3 with respect to the valve seat 2a become poor, there is a problem in that the gasket 5 must be replaced, and the valve stem drive device B must also be replaced.

(b) The same problem as in (a) arises when the sealing degree of the packing 5 against the valve stem 3a is lowered when the liquid in the tank 9 is taken out or the residual cleaning liquid is discharged.

(C) Connection of valve stem drive device B to valve body A is as follows:
The seal holder 6 and the air cylinder 4 are spaced small enough to accommodate the stroke of the valve body 3 required to open and close the valve seat 2a.
Since the valve stem drive unit M8 is interposed between the valve stem and the valve stem drive unit M8, there is a problem in that the valve stem drive unit M8 must be removed even if only the gasket 5 needs to be replaced.

That is, even if the connection between the valve stem 3a and the rod 4a is disconnected, the fixing nut 8 of the seal retainer 6 is removed, and the seal holder 6 is lowered downward along the bolt 7, the seal 5 cannot be pulled out from the lower end of the valve stem 3a. Since it is impossible to insert a new one, or even if it is possible, it is very troublesome (pushing up the valve stem 3a), the valve stem driving device tB must also be removed.

In view of the problems of the prior art as described above, the present invention has been developed to prevent liquid leakage even if the sealing degree between the valve body and the valve seat or the sealing degree between the packing and the valve stem deteriorates and leakage occurs. It is an object of the present invention to provide a reciprocating stop valve in which liquid does not propagate to a valve stem drive device.

[Means to solve the problem]

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 drive device disposed in parallel with the valve body and having a reciprocating rod, and a valve stem drive device that is arranged in parallel with the valve body and has a reciprocating rod; It consists of a connecting member that connects the free end of the extending valve stem and the free end of the rod.

The connecting member may consist of a block portion fixed to the free end of the rod and a pair of parallel arms extending from the block portion to sandwich the free end of the valve rod, or the free end of the rod. It consists of a pair of parallel rotatable arms that are pivotally connected to the valve stem and to the free end of the valve stem through slots.

Furthermore, the valve stem drive device uses an air cylinder and piston rod, a hydraulic cylinder and piston rod, an electromagnetic solenoid and a plunger rod, etc. as appropriate, and the bottom wall of the valve stem drive device is attached to a bracket that protrudes from the outer wall of the valve body. , arranged in parallel with the valve body.

[Effect]

For example, the valve stem of a valve body attached to the storage liquid outlet on the bottom wall of the tank is connected to a valve stem drive device (an actuation mechanism in which the rod is deviated in parallel with the reciprocating line of the valve stem), which is placed in parallel with the valve body. By operating the valve drive device M), which is arranged to reciprocate the line, the valve is reciprocated via a connecting member to open and close the valve seat, storing and discharging the liquid in the tank, and removing the residual cleaning liquid. and discharge.

When the valve is in the closed state, the leakage that occurs when there is a reduction in the degree of sealing between the valve seat and the valve body and a decrease in the degree of sealing between the packing and the valve stem coexists, descends through the valve body, However, since the free end of the valve stem extends (is located below) the free end of the rod of the valve stem drive, the leakage fluid is transmitted through the connecting member that slopes upward toward the free end of the rod. and does not propagate to the valve stem drive device.

Further, even if there is leakage due to the poor sealing between the packing and the valve stem when taking out the stored liquid and discharging the residual cleaning liquid, it will not propagate to the valve stem driving device as described above.

Since the valve body drive device is arranged in parallel with the valve body, the seal can be replaced (parts removed) from the free end of the valve stem by disconnecting the valve stem from the connecting member and removing the seal holder from the seal box. (removal and insertion of a new one) is easy.

(Example) Examples will be described with reference to the drawings.

Note that the same parts as in the conventional example are given the same reference numerals, and an example in which they are attached to the outlet in the bottom wall of the tank will be described.

As shown in FIG. 1, the valve body Δ of the reciprocating stop valve 20 is the same as the conventional example shown in FIG. It consists of a valve box 2 equipped with a packing retainer 6, and a valve body 3 having a reciprocating valve rod 3a.

The valve body drive device B is also the same as the conventional example in that it consists of an air cylinder 4 having a reciprocating rod 4a, but in the present invention, the valve stem drive device B is arranged in parallel to the valve body.

Immediately, the bottom wall of the air cylinder 4 of the valve rod drive device B is attached to the bracket 21 inserted and fixed between the lower surface of the packing box part 2C of the valve box 2 and the packing retainer 6, and the rod 4a is attached.
The reciprocating action line of the valve stem 3a is offset in parallel to the reciprocating action line of the valve stem 3a.

Note that the leakage liquid is transmitted to the bracket 21 and the valve stem drive 1j
+A stepped portion 21a is formed which makes the mounting portion of device B slightly higher so that it does not reach device B.

The free end (lower end) of the valve stem 3a is set to extend from the free end (lower end) of the rod 4a in both open and closed states, and connects the two free ends. The connecting member 22 is tilted so that the side connected to the rod 4a is in a high position and the side connected to the valve stem 3a is in a low position, so that the leakage liquid that descends through the valve stem 3a is transmitted through the connecting member 22 and reaches the valve stem. This is to prevent it from propagating to the drive device B.

The connecting member 22 includes a block portion 22a that is screwed and fixed to the free end of the rod 4a, and a pair of parallel arm portions 22b that extend from the block portion 22a and sandwich the free end of the valve rod 3a. It is configured.

In this embodiment, the valve stem driving device B is an air cylinder 4 and a rod 4a, but is not limited to this, and a hydraulic cylinder and a piston rod, or an electromagnetic solenoid and a plunger rod, etc. can be used as appropriate, and the valve-closing type r arrangement can be realized. A type that is held by a spring bias and supplies a driving medium (air, oil, electric current) when the valve is opened, or a type that supplies the driving medium both when the valve is closed and when the valve is opened is used as appropriate.

Note that the connecting member 22 is not limited to the above-mentioned embodiment, and as shown in FIG. One end of the portion 22b may be pivotally connected to a pin provided at the free end of the rod 4a, and the pin provided at the free end of the valve stem 3a may be inserted into an elongated hole 22c formed at the other end. However, in this case, the reciprocating direction of the rod 4a for closing and opening the valve is opposite to that in the embodiment shown in FIG.

FIG. 3 shows another embodiment of mounting the valve stem drive device B, in which the valve stem drive device uB is attached to a bracket 24 (by welding, etc.) protruding from the outer wall above the packing box portion 2C of the valve box 2.
In this case, there is no need for liquid leakage prevention means such as the stepped portion 21a of the bracket 21 in the embodiment shown in FIG. 1.

〔Effect of the invention〕

In the present invention, the valve body and the valve stem driving device are arranged in parallel, and the free end of the valve stem connecting the connecting member is set to extend beyond the free end of the rod. Even if liquid leaks from the valve seat or packing through the valve stem, it can be prevented from propagating to the valve stem drive device, thus improving the sweat resistance of the valve stem drive device.

(b) There are no attachments and there is a large space below the seal holder of the valve body, and by disconnecting the connecting member at the free end of the valve stem and disconnecting the seal holder from the seal box, The gasket can be removed from the free end of the valve stem and a new one can be inserted, making it extremely easy to replace the gasket without removing the valve stem drive device.

(C) This is a stop valve with a short length in 11 directions, and when it is installed on the bottom wall of a tank, for example, the installation space below the bottom wall can be saved.

Note that the reciprocating stop valve of the present invention can be used not only to be attached to the bottom wall of a tank, but also to attach a branch pipe in the middle of piping.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal cross-sectional front view of a reciprocating type stop valve, and Fig. 2 is a perspective view showing another embodiment of the connecting member. ! FIG. 3 is a partially longitudinal sectional front view showing another embodiment of the installation of the valve stem drive device. FIG. 4 is a partially longitudinal sectional front view of a conventional reciprocating stop valve. 20... Reciprocating type stop valve, A... Valve body, 2... Valve box, 2a... Valve seat, 2b... Flange portion, 2C... Packing box portion, 3... Valve body, 3a...
Valve stem, 5... seal, 6... seal holder, B.
... Valve stem drive device, 4... Cylinder, 4a... Rod, 21... Bracket, 10a... Step portion, 22... Connection member, 2
2a...Block part, 22b...Arm part, 22C...
・Long hole, 23.24...Bracket. Certain 2 figures

Claims (1)

[Claims] 1. A valve body having a reciprocating valve stem, a valve stem drive device disposed in parallel with the valve body and having a reciprocating rod, and in each state of the valve closed and open. A reciprocating stop valve comprising a connecting member that connects the free end of a valve stem extending from the free end of the rod and the free end of the rod. 2. The reciprocating valve according to claim 1, wherein 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 sandwiching the free end of the valve rod. Dynamic stop valve. 3. The reciprocating type stop according to claim 1, wherein the connecting member comprises a pair of parallel rotatable arms pivotally connected to the free end of the rod and to the free end of the valve stem through an elongated hole. valve. 4. The reciprocating stop valve according to claim 1, wherein the valve stem drive device has a bottom wall attached to a bracket protruding from the outer wall of the valve box of the valve body, and is arranged in parallel with the valve body. 5. The reciprocating stop valve according to claim 1, wherein the valve stem drive device comprises an air cylinder and a piston rod, a hydraulic cylinder and a piston rod, or an electromagnetic solenoid and a plunger rod.