Machine emergency closing of the valve on the main gas pipelines

 

The invention relates to a valve and can be used for the transportation of gas via trunk gas pipelines. Automatic emergency shutdown valve on the main gas pipelines contains the dispenser is installed in its housing by a slide valve in the form of a piston, the first and second control chambers connected to the pipeline. In the last set stop valve associated with the hydraulic drive. Cavity control of the hydraulic drive is connected with the output chamber and the membrane. The piston is installed in the housing between the first and second chambers on two oppositely directed upper and lower rods. These rods secured at their axial movement in tight bushings at the bottom of the cover and the partition between the second control chamber. Second control chamber is divided into two cavities by a metal membrane, sandwiched between the upper end of the body and the cover, and is connected with the cavity of the actuator controls the shut-off organ. The upper rod has a tapered head, the base diameter of which is larger than the diameter of the cylindrical part of the rod, and installed in the immediate vicinity of the membrane to ensure rupture of the membranes. The first and tausha chamber is connected to the ballast tank, associated with the gas pipeline through the check valve. Podobrannaya cavity exit chamber connected with the capacity of emergency supplies gas and related pipeline through the check valve. The top and bottom of the cover is provided with holes, indicating respectively the output chamber and the cavity under the lower end of the rod with the atmosphere. The invention eliminates leakage of gas in operational mode, to prevent false operation of the machine in the operating mode, improve the reliability and safety of the device. 1 C.p. f-crystals, 2 Il.

The invention relates to a valve and can be used for the transportation of gas via trunk gas pipelines. Automatic emergency shutdown of the crane (ACP) provides timely emergency automatic overlap of the pipeline in the event of any breaks and leaks gas, which solves the problem of increasing the safe operation of the pipeline and reduce gas losses if it is damaged. ACP is installed in place of ball valves for shutoff of the gas pipeline and provides automatic closing of these valves, that is blocking the emergency section of the pipeline.

Major requirements the project for a filling station in case of accidents.

2. Fully automatic operation without the use of electronics and additional energy consumption of the devices.

3. The versatility of settings, including the possible use of gas stations in a wide range of gas pressures of 3.0 to 6.0 MPa, and in a wide temperature range (-50)-(+50)oC.

4. Protection against false positives, i.e. ensuring the failure of filling stations in the event of a transient pressure differentials arising, for example, when connecting or disconnecting the large gas consumers.

5. Manufacturability of the design of filling stations in the conditions of mass production.

6. Long life (10 years) with high reliability gas stations.

7. The explosion and fire safety gas stations.

Known machines for emergency shutdown of the pipeline if it is damaged, which includes a gas distribution device for drive control stop valve on the gas line and the sensors are responsive to changes in the rate of fall of pressure containing cylinders associated with the gas pipeline through the holes of small cross section (see Andreev, C. Shut-off valve main gas pipelines. - Leningrad: Nedra, 1968, S. 73-76 RF patent 2138720, the application 98114047/6, 1998).

There are also known machines emergency OE velocity of the gas stream (see, for example ABT. St. USSR 189271, CL F 16 K 17/34, 1961 and the patent of the Russian Federation 2101595, CL F 16 K 17/04, 1998).

The main disadvantages of these devices is the presence of a movable pair (saddle valve) in the line of gas supply at the cylinder stop valve (ball valve) gas pipeline. Feature operation filling station is the fact that for a long time (several months or years) he is in a "cocked" condition (valve shut). While this may slow the gas flow through the shut-off body due to insufficient tightness or due to the formation of microcracks in the long run. This may result in false positive ACP when the flow of critical gas volume. On the other hand, if a pair of saddle-valve well proterty, possible diffusion of the materials of the movable pair, which leads to her "sintering" and the loss of mobility and, consequently, failure of filling stations.

The closest in technical essence to the invention is the automatic emergency shutdown of the pipeline if it is damaged (RF patent 2029191, CL F 16 K 17/34, G 05 D 16/10. Publ. 1992) prototype, characterized in that the valve switchgear is made in the form of a spring-loaded first piston mounted in the bottom of the piston hydrocopper, spring-loaded, linked through the plate with the first piston.

The first piston is supported on a thin metal membrane, sandwiched between the lower end of the body and mounted on the end flange with the provision of rupture of this membrane in the lower position of the first piston. A significant advantage of this device is that the distribution slide valve provides the passage to the actuator of the locking member only upon rupture of the membrane, which prevents leakage of gas to the actuator of the locking member on the pipeline.

The main disadvantage of this machine is the complexity of the design, which includes three piston, a few o-rings, a complicated system of regulation annular channel hydrocopper requiring disassembly of the machine for its settings, as well as additional use (along with the pneumatic system) hydraulic system with a non-freezing liquid. This leads to the complexity of the technology and configuration of the machine and its operation that, ultimately, is reflected on the primary indicator of reliability.

The problem to which the invention is directed, is to increase the reliability of the machine by improving the manufacturability, reduce the number of postie the task is in known automatic emergency shutdown of the pipeline containing the slide valve in the form of a piston, the first and the second control chamber connected to the gas pipeline, which has a stop valve associated with the hydraulic actuator, the control cavity which is connected to the output chamber and the diaphragm, a piston mounted in the housing between the first and second control chambers on two coaxial, oppositely directed rods fixed in sealed sleeves, with the possibility of their axis. Bushings are located in the lower cover and the partition between the second control chamber and the output chamber. The output chamber is divided into two cavities by a metal membrane, sandwiched between the upper end of the body and the top cover and connected with the cavity of the actuator controls the shut-off organ. The upper piston rod has a tapered head, the diameter of which is larger than the diameter of the rod, and installed in the immediate vicinity of the membrane to ensure the gap. The piston is calibrated through holes, which communicate between the first and second control chambers. The top and bottom of the cover is provided with drainage holes, which communicate with the atmosphere respectively output the EP with the ballast tank, associated with the gas pipeline through the check valve, the second control chamber is connected through the connection with the pipeline, and the lower cavity exit chamber through the nozzle connected with the capacity of emergency supplies gas and related pipeline through the check valve. Drainage hole at the top of the cover, is made vertically or inclined, has a tapered input and output, it is the ball shut-off element with the possibility of overlap of the openings when the pressure in the output chamber.

The invention is illustrated in Fig. 1, 2, which shows the ACP scheme.

The machine consists of a dispenser is assembled in the cylindrical housing 1, a closed top 2 and bottom 3 covers. Between the upper end of the body 1 and lid 2 is sandwiched a thin metal membrane 12. In the top cover 2 is made of vertical drainage hole 13 with ball shut-off element. The valve as the piston 4 is installed in the housing 1 between the first 14 and second 15 control cameras at two opposite upper 6 and lower 7 stocks. The piston is made of calibrated through hole 5 with a diameter d

The spool can be moved along the body 1 in sealed sleeves 8 and 9 located is shaped head 11, the base diameter of which is larger than the diameter of the cylindrical part of the rod 6, and is installed in the immediate vicinity of the membrane 12 to ensure rupture of the membrane.

In the volume of the dispenser is formed of three chambers: the first control chamber 14 is located between the bottom cover 3 and the bottom end of the piston 4; second control chamber 15 is located between the upper end face of the piston 4 and the bottom end of the partition 10; output the camera includes two cavity - top 16 located between the upper end of the membrane 12 and the upper cover 2 and the lower cavity 17 that is located between the bottom end of the membrane 12 and the upper end of the partition 10.

The first control chamber 14 through the fitting 18 is connected to the ballast tank 19, through which the check valve 20 is connected with the pipeline 21. Second control chamber 15 through the nozzle 22 is connected with the pipeline 21. Premembrane (bottom) cavity 17 of the output chamber through the fitting 23 is connected with the capacity of emergency supplies gas 24, which, through the check valve 25 is connected to the pipeline 21. Cavity control of the hydraulic actuator 27 stop valve (ball valve) is connected with the output chamber 16 and the membrane 12. In the bottom cover 3 is made drainage hole 29, telling the cavity under the lower end of stone state When connecting the machine to the pipeline 21 gas through the check valves 20, 25 fills the tank 19, 24 and through the fittings 18, 22, 23 enters the control chamber. The pressure in the chambers 14, 15, 17 is aligned and equal to the pressure in the pipeline 21. The force acting on the piston 4 downward and causes the spool in the original (lower) position. The magnitude of this force is equal to F=Po(S1-S2), where Ro- pressure in the pipeline; S1- the cross-sectional area of the piston 4; S2- the cross-sectional area of the rod 7.

Work in operational mode.

During operation of filling stations in the operational mode, when the pressure in the pipeline 21 is continuously or slow changes (increases or decreases by connecting consumers gas or due to the irregularity of the operation of compressor stations). In the chambers 14, 15, 17 pressure continuously or slowly varying, however, remains the same for each camera due to the slow flow of gas through a calibrated orifice 5 in the piston 4, which separates the first and second control chambers.

When this valve is in original condition (bottom). If you have a slow gas flow during long-term operation through the seal 9, the gas is discharged to atmosphere through the vent hole 29 in the lower CrackBerry site (if possible violation of its integrity due to corrosion, for example) using a drainage hole 13 in the top cover 2. Through this hole the accumulated gas, overcoming the force of gravity ball shut-off element, picks up the ball and through the resulting annular gap venting to the atmosphere.

Work in emergency mode.

In case of damage (rupture) of the pipeline 21, the pressure therein begins to fall sharply, and the gradient of the reset several times higher than in the case of pressure fluctuations in operational mode. While check valves 20, 25 are closed, isolating the vessel 19, 24 from the pipeline 21, thereby maintaining a constant pressure P0corresponding to the pressure in the pipeline 21 before the accident. The pressure in the second control chamber 15 directly connected through the fitting 22 with the gas pipe 21 also starts to fall sharply in accordance with the pressure drop in the pipeline 21.

The hydraulic resistance of an orifice 5 in the piston 4 prevents the rapid drop in pressure in the first control chamber 14. As a result, the force F acting up and driving the piston 4. The magnitude of this force is equal to F1= P1(S1-2S2)+P(S1-S2), where1<P).

Under the action of forces F1the piston 4 moves upward; this conical head 11 pierces the membrane 12. The gas from the tank 24 through the fitting 23 is held in the upper chamber exit chamber 16 and through the fitting 26 is supplied into the cavity of the control of the hydraulic actuator 27, providing a closure gate 28 of the pipeline 21. Drainage hole 29 prevents the formation of the force, preventing upward movement of the piston 4 due to the formation of a vacuum in the cavity between the bottom cover 3 and the bottom end of the rod 7. Under pressure P0in the upper cavity 16 output camera ball shut-off element overlaps the drain opening 13 in the top cover 2, preventing the discharge of gas into the atmosphere.

Setting up filling stations is carried out by selection of the diameter of the calibrated holes 5 in the piston 4 and the value of the free volume of the ballast tank 24.

The expected positive effect of the invention is as follows:
1. The slide valve of the distributor provides getperiod to the actuator of the valve only when the rupture of the membrane, which prevents leakage of gas in the operational mode.

2. The presence of the rod 7, the lower end of which is affected by atmospheric pressure, provides the differential raboty.

3. The presence of cone-shaped head 11 of a diameter greater than the diameter of the rod 6, increases the reliability of gas stations, allowing for the free passage of gas from the bottom of the cavity 17, the output of the camera in the upper cavity 16.

4. The presence of the ballast tanks 24 and calibrated holes 5 in the piston 4 allows the variation of the diameter of these holes and the size of the free volume of the vessel 24 to select the desired mode of operation of filling stations in relation to specific characteristics of the gas (the gas flow rate, working pressure, emergency gradient value of the discharge pressure).

5. The presence of drain holes 13 with ball shut-off element increases the reliability of gas stations (in terms of protection against false positives) by the release of gas into the atmosphere when the membrane defects that occur during long-term operation.

6. The pneumatic connection between the control chambers 14, 15 and the bottom of cavity 17, the output of the camera, as well as the presence of drain holes 29 increases the reliability of gas stations, ensuring its normal functioning in the operational mode, even with the lack of the object of the piston and gaskets 8, 9, which may be broken when a sufficient period of time operational mode.

References
1. the 34. Publ. B 27, 1999

3. RF patent 2101595, CL F 16 K 17/04. Publ. BI 1, 1998

4. The copyright certificate. The USSR 189271, CL F 16 K 17/34, 1961.

5. RF patent 2029191, CL F 16 K 17/34, G 05 D 16/10. Publ. 1992


Claims

1. Machine emergency closing of the valve on the main gas pipelines, containing the dispenser is installed in its housing by a slide valve in the form of a piston, the first and second control chambers connected to the pipeline, which has a stop valve associated with the hydraulic actuator, the control cavity which is connected with the output chamber and the membrane, characterized in that the piston is installed in the housing between the first and second control chambers on two oppositely directed upper and lower rods, mounted with the possibility of axial movement in tight bushings at the bottom of the cover and the partition between the second control chamber, which is divided into two cavities by a metal membrane, sandwiched between the upper end of the body and the cover, and is connected with the cavity of the control actuator of the locking member, with the upper rod has a tapered head, the base diameter of which is larger than the diameter of the cylindrical part of the rod, and the control chamber communicated with each other via calibrated through holes in the piston, the first control chamber is connected to the ballast tank associated with gas pipeline through the check valve, and podobrannaya cavity exit chamber connected with the capacity of emergency supplies gas and related pipeline through the check valve, the top and bottom of the cover is provided with holes, indicating respectively the output chamber and the cavity under the lower end of the rod with the atmosphere.

2. Machine under item 1, characterized in that the hole in the top cover, located vertically or inclined, has a tapered input and output and it is a ball shut-off element with the possibility of overlap of the openings when the pressure in the output chamber.

 

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