JPH0542592B2 - - Google Patents

Description

Claim 1: A cylindrical valve chamber 12, 13 in which the valve is adapted to be oriented along the liquid/gas flow direction F.
and a radially disposed valve chamber 14 which can be closed with a removable bonnet 9, the valve further having an operative closed position closely associated with a seat 4 in the valve housing and a radially arranged valve chamber 14 which can be closed with a removable bonnet 9; For use in a submerged/subsurface position, e.g. for liquid/gas, with a winged valve body 3 movable between an inoperative position and an inoperative position that opens the valve to allow liquid/gas to flow through. A shut-off valve for subsea pipelines, the valve being provided with a cylindrical piston 7 displaceable axially in a cylindrical valve chamber 12, 13 of a valve housing between an advanced position and a retracted position; , a cylindrical piston extends across a radial valve chamber 14 in the valve housing, thus separating this valve chamber from the cylindrical valve chambers 12, 13; As it retreats from the area of the valve chamber, the valve is retracted from the flap valve body 3.
includes a locking device for the cylindrical piston 7 pivotally mounted on the bonnet 9, the locking device for the cylindrical piston being locked in the upper position in which the cylindrical piston can move without obstruction and in the forward position of the yoke 20. A shutoff valve characterized in that it consists of a yoke 20 which is movable between a lower position and a lower position cooperating with a groove 21 of a cylindrical piston 7 for locking the cylindrical piston 7.

2. The yoke 20 is moved by a hydraulic cylinder connected by a single member to a crank 17 which is rotatably mounted relative to the bonnet 9; 2. A shutoff valve as claimed in claim 1, characterized in that, when the yoke is in the lower position, the bonnet with the attached device can freely rise without the yoke under the influence of pressure and vacuum.

3. According to claim 1 or 2, the hydraulic system for the actuators 15 and 16 and the various function control devices for the valves are disposed in a container attached to the top of the bonnet 9. shutoff valve.

TECHNICAL FIELD The present invention relates to a fast-acting shut-off valve for use submerged in water, liquid or other fluid, and in particular as set out in the preamble of claim 1. Regarding certain types of shutoff valves.

Previously, in case of an accident or major defect,
It has been difficult to provide shut-off valves for installation in pipelines that can prevent significant amounts of hydrocarbons from returning to the point of origin. Maintenance and replacement of valve elements commonly used today involves considerable expense due to the extensive requirements for such operation.

As an example, when using a conventional shutoff valve in a pipeline, such as a stud pipe, the line fills with water when the valve is opened for repairs. Thereafter, approximately 60 days are required to drain and dry the pipeline before it can be used again for gas/oil transport. This involves a loss of production during this period, which has important economic consequences.

When cleaning pipelines, approximately 200 tons of dirt/dirt are removed as the flow passes through the pipes and valves.
Particles pass through the tubes and valves. To prevent this material from adhering, the tube must be continuous, without cavities and edges. It is also desirable to protect the moving parts of the valve from the ingress of dirt/particles and heavy hydrocarbons, since they will adhere to them and cause corrosion and sticking whenever they do. Therefore, shut-off valves are designed to be able to direct objects/liquids/gases through a continuous "pipe" through the valve. Said object may be a so-called "pitz", an object passed through the pipe in order to clean it, or a so-called "sense pit", i.e. a recording/measuring device suitable for measuring the conditions inside the pipe. ``Linalog'' may also be used.

From French Patent No. 1594134, a shut-off valve of the type with a shut-off clock is known, which has a cylindrical piston that can act between two positions in the longitudinal direction of the passage, in which the cylindrical When the piston is in the forward position, this separates adjacent chambers with valve clocks mounted on the chamber walls. The valve according to the French patent is used in particular in the nuclear power industry.

From US Pat. No. 4,190,074 a pressure-equalizing flap valve is known, the valve housing of which has a cover member into which the flap member can be pivoted. In said deployment, maintenance of the wing member can be accomplished through the opening in the valve housing when the cover member is removed.

DISCLOSURE OF THE INVENTION It is an object of the present invention to prevent the fluid (water/liquid) surrounding the valve from entering the pipeline in which the valve is used, and at the same time prevent the fluid (water/liquid) surrounding the valve from entering the valve packing surface, the packing, the valve stem, the shut-off device, etc. When carrying out maintenance, repair and/or modification of elements such as The object of the present invention is to provide a shut-off valve which can be achieved without the need to encapsulate the valve, or to construct the valve in a housing, chamber, etc., or to cover the valve in any other way.

When the valve is in the open position and the cover is removed,
Even if the valve is open, the liquid flowing through the pipe system/
Maintenance of the valve can be performed and elements such as seals, seats, shutoffs, etc. can be replaced without releasing gas into the surrounding medium. At the same time, the surrounding medium (liquid/water) is prevented from penetrating into the tubing system. In operation, packing rings, seats and similar elements are protected from contamination and wear by dirt/particles as well as gas/oil/liquid flow.

According to the invention, this is achieved by a shut-off valve constructed and arranged according to the characterizing part of claim 1.

Advantageous embodiments representing further developments of the invention according to claim 1 are disclosed in the following claims.

[Brief explanation of the drawing]

An example of an embodiment according to the invention is illustrated in the accompanying drawings.

Figure 1 shows an element (second
1 is a sectional view through the axis of the shut-off valve according to the invention in a side view (corresponding to section - in the figure); FIG.

2 is a top view of the valve according to FIG. 1 without the removable lid; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The shutoff valve illustrated in the drawings is designed to prevent the surrounding medium from entering the pipeline and to ensure that when the valve is overhauled, the fluid passing It is intended for use in sub-water/sub-surface locations where it is desirable that there is no risk of leakage, e.g. in sub-sea pipelines for liquids/gases.

The valve has a valve housing, which comprises a cylindrical valve chamber 12, 13, intended to be oriented along the liquid/gas flow direction F, and an upward transverse connection with a removable lid 9. It consists of a radially arranged valve chamber 14 formed by a tube. The valve also has a winged valve body 3 which has an actuated closed position in close cooperation with a seat 4 in the valve housing and an inactive position which opens the valve to allow liquid/gas to flow through in direction F. You can move between.

The flapping valve body 3 can be moved passively under the influence of gravity and/or the flow medium, or the flapping valve body 3 can be actuated by remote control by an actuating device. Preferably, the winged valve body 3
is actuated by a hydraulic cylinder 15, which is preferably located under the bonnet 9.

The cylindrical valve chamber 1 has different diameters on the inside and outside and is arranged so as to extend from one another.
It is formed by two elements 1 ′, 1 ″. The valve chamber 12 located rearward with respect to the flow direction F has the smallest internal diameter and, together with the coaxial inner tube part 11 , the cylindrical piston 7 The cylindrical piston 7 forms a cylindrical steering member for the cylindrical valve chamber 12, 1 of the valve housing between forward and retracted positions.
3 can be displaced in the axial direction. In the forward position, the cylindrical piston 7 rests against the end face of the end piece 19, in which the sleeve device extends and covers the radial valve chamber 14 of the valve housing;
In this way, the valve chamber 14 is formed into a cylindrical valve chamber 12,1
3 and thus replacement of the valve element can be accomplished without contacting the surrounding medium with the flowing fluid. In the retracted position, the cylindrical piston 7 is retracted from the area of the radial valve chamber 14 .

The cylindrical piston 7 is formed with a radially projecting collar 7' with an outer diameter that approximately corresponds to the inner diameter of the valve chamber part 13, so that the two
fed through an opening 8 or 8' to effect a displacement of the sleeve 7 between two outer positions;
A reaction surface is formed for the medium under pressure or vacuum.

In order to determine the position of the cylindrical piston 7 in the forward position, the valve also has a suitable locking device. Preferably, such a device has a hydraulic cylinder 16 connected by a member to a crank 17 pivotally mounted to the bonnet 9 at 18 to move the yoke 20 between an upper position and a lower position. suitable for moving. In this upper position, the cylindrical piston 7 can move without pinching, and in the lower position the yoke 20 cooperates with the groove 21 of the cylindrical piston 7 in order to lock it in its forward position. This means that when the yoke 20 is extended to the downward position,
By designing the connection between the crank 17 and the yoke in such a way that the bonnet, together with the devices attached to it, can be lifted freely without retracting the yoke 20 from the groove 21 in the cylindrical piston 7. , achieved.

In a preferred embodiment of the valve according to the invention,
In order to ensure a tight connection between the cylindrical piston 7 and the valve chamber 1, the valve is equipped with a special packing device (not shown), which can be activated from the outside, for example hydraulically.

The devices for applying hydraulic pressure to the actuators 15, 16 and the devices for controlling the valve action can preferably be arranged in a chamber 24 located on the top side of the bonnet 9.

The bonnet 9 usually has a pivotable clamp 1
0 to hold it in place.

The end piece 19 serves as a hold-down piece against the displacement of the sleeve 7 in the flow direction F, and furthermore, the end piece 19 acts as a hold-down piece against the displacement of the sleeve 7 in the flow direction F, and furthermore, the sleeve 7 through the opening that appears when the end piece is removed
installation.

All elements can be made of steel with cladding.

To simplify the drawing, packing rings and devices and hydraulic connection lines are not shown.

During normal operation, fluid flows in direction F. The cylindrical piston 7 is in the forward position and, if necessary, the flap valve body 3 is held in the upper position by the hydraulic actuator 15. In an export pipeline, it is possible to choose to employ such an actuator 15 as necessary, but in an import pipeline, an actuator is absolutely necessary.

To prevent liquid in a pipeline from flowing in an undesired direction in certain emergency operations;
It is absolutely essential to prevent the enveloping medium and especially sea water from entering the pipeline system. By means of a signal from the platform, the cylindrical piston 7 can be pushed back, and the valve can be pushed back by the influence of gravity, by the liquid returning in the export pipeline, or by the actuator A. When the flap valve body 3 engages with the valve seat 4, the valve is closed. This position is illustrated in dotted lines in FIG.

After the defect requiring valve closure has been corrected, the valve can be reopened. This is achieved by equalizing the pressure on both sides of the winged valve body 3 due to its rise into the valve chamber 14 in the radial direction. If the valve is equipped with a hydraulic flap valve actuator 15, the flap valve body 3 can be suitably moved by this device. Otherwise, the winged valve body 3 can be moved into the intended position by displacement of the cylindrical piston 7 into the forward position, the movement of which is dependent on the appropriate design of the winged valve body 3. It can be achieved.

In some circumstances, it may be desirable to have a shutoff valve that is particularly fast acting. In this case, during normal operation, the cylindrical piston is held in a retracted position. This allows a particularly rapid closing of the valve by actuation of the flap valve body. Cylindrical piston 7
are moved to the forward position only when attempting to pass through a pit or when it is necessary to perform repair and maintenance work on valve packing surfaces, shafts, flaps, etc. In this mode of operation,
It is clear that many of the important elements of the valve are exposed to the effects of corrosion and erosion of the flowing medium. However, with the means available to accomplish routine inspection of valves according to the invention, the harmful consequences that may occur with this mode of operation can be maintained at a low level or, with appropriate arrangements and monitoring. It can be avoided entirely by maintenance schedules.

The unique features of the valve will be shown again.

When the cylindrical piston 7 is fixed in the advanced position by the yoke 20, the bonnet 9 with attached elements can be removed without interrupting the operation of the pipeline. Before this operation,
A packing device (not shown) between the valve chamber 1 and the cylindrical piston 7 should be activated and the pressure differences on both sides of the bonnet 9 should be equalized. One of the different types of maintenance and repair operations is then selected. In shallow water,
After removing the bonnet, the diver
Tasks can be easily accomplished. Especially in deep water
Manned or unmanned submersibles can also be used. However, if one wishes to take full advantage of the special features of the valve according to the invention, it is possible instead to use the lifting of the bonnet 9 and the equipment attached to it, so that inspections etc. can be carried out on board, or The bonnet 9 (equipped with the device) can be replaced very simply by a new or overhauled bonnet.