RU2289052C2 - Shut-off valve for tank-container - Google Patents

Abstract

FIELD: tanks-containers transported by railway, sea and automobile transport.

SUBSTANCE: proposed shut-off valve has sectional body with connecting flanges. One flange is connected with branch pipe. Second flange is located in center of valve body and is connected with tank-container; it has side holes for spindles of hand drives. Circular bore is made in outer surface of body near flange secured on tank. Provision is also made for changeable branch pipe with thread at the end and with flange. Mounted in succession inside body are three shut-off members: inner shut-off member made in form of valve, outer shut-off member in form of ball and additional shut-off member made in form of plug screwed on branch pipe thread. Inner and ball-type shut-off members are provided with independent hand drives. Inner shut-off member is sectional in structure; it includes main part spring-loaded for opening and pilot part spring-loaded for closing and coaxially connected with rod. Rod is engageable with mechanism converting rotary motion of drive into advance motion of rod. Flange connected to tank is provided with additional threaded holes for connection with flange of changeable branch pipe which is connected after damage of body over circular bore.

EFFECT: extended functional capabilities of drainage of liquefied gas from tank-container in an emergency.

2 cl, 2 dwg

Description

The invention relates to products of pipe fittings designed for installation on tank containers in which aggressive and life-threatening liquids and gases are stored and transported.

Shut-off valves installed on tank containers, as a rule, have three shut-off bodies to ensure reliability of sealing in case of emergency in the process of transportation and storage of the tank container. One locking element is located inside the tank, the second, outer and third additional are located outside the tank. This design ensures the reliability of the sealing of the tank cavity in case of emergency situations.

Known shut-off valve for the tank container [1], which is installed to drain and fill the tank, taken as an analogue.

The valve consists of a body composed of two parts fastened by flanges. A flange is made on one part of the body, which secures the valve to the tank, inside the cylindrical part of the body there is an internal valve-type locking element, between which parts a ball locking element is placed. A pipe with a thread at the end is attached to the housing by a flange. A cap is screwed onto the thread, which is the third locking member.

The valve is attached to the wall of the tank container by means of a flange in such a way that the internal shut-off element located on the pipe protruding beyond the flange is always located inside the tank cavity and is protected by the tank wall from external mechanical influences. The valve body near the mounting flange has an annular groove weakening the strength of the body and determining the place of destruction of the body in emergency situations, when the body can be cut off or broken off.

The executed curved branch pipe with a flange for fastening to the body can be installed with the direction of the outlet in any of the four sides, and a straight branch pipe can also be installed.

The plug (third locking member) is made with an annular seal and is pressed against the nozzle opening with a union nut. The plug is removed only at the time of discharge or filling of the product.

The external locking member is a ball valve of known design and is actuated by a lever through a spindle.

The internal locking element is located on the tubular part of the body and consists of the pilot and main valves closing the tubular part of the body on which the seat is made. The valves are mounted on a stem mounted in a sleeve that guides the stem coaxially to the body. The pilot valve is rigidly fixed to the stem, and the main one is slidably mounted on the stem and is pressed against the pilot valve by spring. The second end of the spring abuts against the sleeve and squeezes the valve from the main seat. A head is made at the second end of the stem, a return spring is placed between the stem head and the sleeve on the stem, pressing both valves against the seat. Since the return spring is stronger than the spring pressing the main valve to the pilot, it installs both valves on the seat. The stem head is in contact with the cam located on the manual drive spindle.

The valve is opened by turning the handle of the manual actuator, while turning the cam, depresses the rod, compresses the return spring, and both valves are diverted from the seat, opening the passage. Closing occurs when the cam is manually rotated in the opposite direction.

All three shut-off elements are installed sequentially downstream to increase the degree of reliability of ensuring the tightness of the valve shut-off element and to prevent leakage of harmful and life-threatening liquids and gases transported in tanks.

The described shut-off valve, thanks to the three shut-off elements, has high reliability for tightness and high performance under normal operation.

At the same time, the known shut-off valve has the following disadvantages.

When the tank container crashes, it is possible that the part of the shut-off valve body can be torn off along the annular groove. When liquidating an accident, the product from the tank must be drained into another tank, and the hose must be connected to the rest of the valve body.

Since the rest of the body has no docking place, the drainage process becomes technologically difficult, and sometimes impossible.

This is the disadvantage of this shut-off valve.

From scientific and technical sources, a locking device for a tank container of CJSC "TC SIBUR NN" [2], adopted as a prototype, is known.

The locking device consists of a solid cylindrical body with a flange for attachment to the tank wall. One end of the casing is made in the form of a pipe with a saddle at the end for an internal locking element made of two valves: pilot and main. The second end of the housing is made with a seal for the ball locking element and a thread for the pipe clamping the ball locking element and serving as a continuation of the housing. At the second end of the pipe, a thread is made for the plug, which is the third locking element. On the side surface of the housing there are two holes for installing bushings for manual drives of the internal and external (ball) locking bodies. All three locking elements: internal, external and additional, are installed sequentially in the direction of the flow of the working medium and duplicate each other.

A V-groove is made on the surface of the housing near the flange.

The external locking element consists of a ball with a hole and is placed between the seats. The ball is connected to the handle by means of a spindle, by means of which it can be rotated 90 ° and thereby block and open the passage opening of the locking device. The internal locking element is mounted on a stem located in a sleeve that provides the direction of the stem coaxial to the housing. The pilot valve is rigidly fixed to the rod, and the main valve is mounted movably on the rod and is pressed against the pilot valve by a spring. The second end of the spring abuts against the sleeve and squeezes the valves from the main seat. A head is made at the second end of the stem. Between the stem head and the sleeve, a return spring is placed on the stem, pressing both valves against the seat. Since the return spring is stronger than the spring pressing the main valve to the pilot, it installs both valves on the seat. The stem head is in contact with the cam located on the manual drive spindle. The valve is opened by turning the handle of the manual actuator. At the same time, the cam rotates, squeezes the stem, compresses the return spring, and both valves are diverted from the seat. Closing occurs when the cam is manually rotated in the opposite direction.

The disadvantage of the locking device is the following. The locking device must have several designs, in which the pipe can be straight and directed left or right. The threaded connection of the pipe with the simultaneous clamping of the ball and the orientation of the bend of the sleeve does not allow such designs. In addition, after an accident, the valve does not allow joining the tank after an accident to discharge the product.

The basis of the invention is the task of creating and developing a shut-off valve for a tank container by creating a docking point for the remaining part of the housing with a drain hose and using a shut-off valve-nozzle assembly to connect to the remaining part of the housing.

The task and technical result is achieved by the fact that in the shut-off valve for the tank container, consisting of a composite housing with connecting flanges: one for connecting to the nozzle, the second, in the middle of the housing, for connecting to the tank, with side openings for manual drive spindles , with an annular groove made on the outer surface near the flange mounted on the tank, a replaceable nozzle with a flange and a thread on the end; three sequentially installed locking elements with independent from each other manual drives: internal valve type, external ball and additional in the form of a plug screwed onto the pipe thread; manual actuators of the locking elements, while the internal locking element is made integral, consisting of the main, spring-loaded to open, and pilot, spring-loaded to close and coaxially connected to the rod, interacting with the mechanism for converting the rotational movement of the actuator into translational movement of the rod, on the flange attached to the tank additional threaded holes have been made for attaching a flange to a replaceable nozzle to be attached after emergency destruction of the housing along an annular groove.

In addition, interchangeable nozzles are made with flanges that have the ability to dock after an accident with both the end of the housing and the flange in place of the separation of the housing.

The essential features common with the prototype are: housing, manual drives of locking elements, internal locking element, ball valve, plug.

The salient features of the inventive shutoff valve, providing a technical result, are as follows:

- on the flange of the body attached to the tank, additional threaded holes are made for attaching the flange of the replaceable nozzle, which is attached after emergency destruction of the body along an annular groove;

- interchangeable nozzles are made with flanges that have the ability to dock with both the end of the body and the flange at the point of separation of the body after an accident.

In addition, there are additional significant features that provide increased use of the valve.

These significant distinguishing features provide the following result.

In the event of an accident with a filled tank and breaking off a part of the body along an annular groove to eliminate a dangerous situation, it is necessary to pour the contents of the tank into an air-conditioned tank. To do this, it is necessary to attach a drain hose to the emergency tank, but it is impossible to attach a drain hose directly to the break point. Therefore, in the flange that remains mounted on the tank, additional threaded holes are made, with which a replaceable pipe is attached with bolts to which a regular drain hose is connected or a plug is installed.

The claimed technical solution of the shut-off valve for the tank container is illustrated by the drawings: in Fig. 1, a longitudinal section is shown, in Fig. 2 is a section along the plane AA. The valve body consists of two parts 1a and 1b, between which a locking member 2 is installed in the form of a ball, connected to the spindle 3 of the manual actuator 4. A sealing ring 5 is installed between the parts of the body, the ball 2 is sealed with PTFE rings 6, the spindle 3 is sealed with an oil seal 7. K a pipe 8 with a cap 9, a seal 10 and a union nut 11 is attached to the lower flange of the housing. The cap 9 is a locking member duplicating other locking members. The casing has a flange 12, by which the valve is attached to the wall of the tank 13. An annular groove 14 is made on the cylindrical part of the casing, weakening the casing's strength at this point and determining the break point in an emergency. Holes 15 are made on the flange 12 (see FIG. 2) for attaching the valve to the tank, as well as additional threaded holes 16 for attaching the flange of the replaceable pipe 8, which is attached after emergency destruction of the housing along the annular groove 14.

On the tubular part of the housing 1a, a saddle 17 (see Fig. 1) of the inner locking member 18 is made on top. Inside the tubular part of the housing 1a, a sleeve 19 is installed on the jumpers, in which the stem 20 is located, and a pilot locking member 21 is mounted on top of the stem 20, which closes the pilot hole in the main locking body 18 in the saddle. A flange 22 is made at the second end of the stem for mounting the return spring 23 and a recess 24 for articulating the stem 20 with the connecting rod 25. The spring 23 abuts against the shoulder 22 with its lower end and lowers the stem 20 and with it the internal locking member 18 to the pilot locking member 21.

The manual drive of the internal locking element consists of a spindle 27 with a handle, a crank 28, movably articulated with a connecting rod 25, is mounted on the spindle 27.

Thus, three sequentially installed locking elements are mounted in the shutoff valve: internal, external ball and additional in the form of a plug.

The algorithm for the shut-off valve is as follows. In the initial state, all locking elements block the valve passage. To fill the tank with a product, unscrew the union nut 11 and remove the plug 9, screw the inlet hose onto the freed thread of the nozzle 8, turn the actuator 4 by opening the ball shut-off element 2 and also turn the crank arm of the internal valve clockwise to lift the connecting rod 25, rod 20, the pilot locking member 21, and after it, through the spring 26, the main locking member 18 rises. The drive handle of the internal locking member is fixed with a cable. The product is fed through the inlet hose and the tank is filled. After filling the tank, close the ball locking element, remove the latch from the handle of the actuator of the internal valve and under the action of the return spring 23, the internal valve closes and the handle of the actuator returns to its original position.

Disconnect the inlet hose and install the plug 9 with the union nut 11. The plug remains on the valve until the product is drained from the tank.

The operation of the valve during the discharge occurs in this sequence. Unscrew the union nut 11 and remove the cap 9, screw the drain hose onto the freed thread of the pipe 8. The handle of the manual drive of the internal locking body is turned clockwise and fixed with a cable, while the connecting rod 25 rises and lifts the stem 20 with the pilot locking member 21. Through the pilot hole, the product fills the cavity in front of the ball locking member 2, the pressure under the locking member 18 becomes equal to the pressure in the tank and the spring 26 raises the locking element 18 against the stop in the pilot locking body 2. The product is discharged from the tank at a predetermined, not exceeding the permissible speed, which cannot create an effort Noe to compress the spring 26 and the inner closure member landing on the seat.

If the drainage process has occurred normally, then close the ball valve, the internal locking element 18 and the pilot 21 are lowered down by turning the hand drive handle counterclockwise. Disconnect the drain hose and install a plug that remains wound until the next drain.

Thus, the shut-off valve for the tank container provides the expansion of the technological capabilities of the discharge of liquefied gas from the tank container after the accident and allows you to accelerate the elimination of emergency situations.

Used sources

1. Fort vale technical documentation for the "2 gas foot valve short profile" valve - analogue.

2. RF patent 2154217 C1. The locking device for the tank container, 08/10/2000, the prototype.

Claims (2)

1. Shut-off valve for the tank container, consisting of a composite housing with connecting flanges: one for connecting to the nozzle, the second in the middle of the housing for connecting to the tank, with side openings for the spindles of manual actuators, with an annular groove made on the outer surface near the tank flange, replaceable pipe with flange and thread on the end, three sequentially installed locking bodies with independent from each other manual drives: internal valve type, external ball additional and in the form of a plug screwed onto the thread of the pipe, manual drives of the internal and ball locking elements, while the internal locking element is made integral, consisting of the main, spring-loaded to open, and pilot, spring-loaded to close and coaxially connected to the rod, interacting with a mechanism for converting the rotational movement of the drive into translational movement of the rod, characterized in that additional threaded holes are made on the body flange connected to the tank attaching a flange to a replaceable nozzle attached after emergency destruction of the housing along an annular groove. 2. The shut-off valve according to claim 1, characterized in that the replaceable nozzles are made with flanges that are able to dock with both the end of the housing and the flange at the point of separation of the housing after an accident.

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