CN2713250Y - Water-sealed valve for gas conduit - Google Patents

Abstract

The utility model relates to a gas pipeline water seal valve, which solves the defect that the existing water seal valve gas is easy to leak and cause gas explosion accidents. A contact valve is installed in the middle section of the drain pipe to connect with the three-way drain pipe, the three-way drain pipe is connected to the anti-leakage device and the contact valve of the anti-leakage device, the anti-leakage device is connected to the outlet pipe, and the inner wall of the anti-leakage device is welded with a steel plate The trapezoidal ring plate is formed, the inner diameter of the trapezoidal ring plate is provided with a sealing ring, and a special-shaped connector is welded on the bottom edge of the trapezoidal ring plate. The inner cavity of the comparator is equipped with an indicator rod, and the upper and lower ends of the indicator rod are equipped with metal balls that can be screwed. on the shut-off valve body. And a fire extinguishing device is installed on the release pipe. It is mainly used as a water seal valve for cutting off gas during pipeline maintenance.

Description

A gas pipeline water seal valve

technical field

The utility model relates to a pipeline gas sealing device, in particular to a "V-shaped" water-seal cut-off valve for cutting off the gas in the gas pipeline laid overhead in metallurgical enterprises.

Background technique

Gas pipeline water seal cut-off valve can play a good role in sealing gas with water in large gas pipeline systems, especially during gas pipeline maintenance or other operations, it can quickly and reliably cut off gas, and can be used according to the effective water seal. The water level is controlled to replenish water to prevent gas leakage and pollution caused by the water sealing valve during the water sealing process. However, its disadvantage is that when the water-sealed cut-off valve is normally connected to the gas, because the connection valve is connected to it, when the gas leaks, part of the gas will be sealed by the internal structure of the water supply device, and the other part of the gas will pass through the open valve. If the contact valve leaks outwards, the function of replenishing water and the function of preventing gas leakage will be lost, resulting in a gas accident hazard. Chinese Patent "Gas Pipeline Gas Leakage Prevention Device" ZL 01 239576.5, see Figure 1, 1 is a water seal cut-off valve, 2 is an upper sewage cut-off device, 3 is a vertical sewage pipe, 4 is a lower sewage cut-off device, 5 is a drainage tank, 6 is a drainage pipe, 7 is a connecting valve, 8 is an anti-gas leakage device with a control water level, 9 is a water supply control valve, 10 is a release pipe, and 11 is a water seal cut-off replenishment valve. The working principle of the water seal cut-off device is: when the gas is blocked, the upper and lower sewage cut-off devices 2 and 4 are in the unblocked position, the contact valve 7 is closed, the water supply control valve 9 and the water seal cut-off and replenishment valve 11 are opened, and the water is sealed. Into the "v" type water seal valve cavity of water seal cut-off valve 1, when the seal water flows through the drain pipe 6, it reaches the effective height of H1, realizing the purpose of water seal to block gas, in order to ensure effective water seal and cut off gas , is provided with the control water level of the anti-gas leakage device 8 with control water level and has the function of preventing gas leakage, when the pressure fluctuation at one end of the gas or the condensed water increases, a part of water flows out through the anti-gas leakage device 8 with control water level. When the water level is lower than the set height, the anti-gas leakage device 8 with water level control will automatically replenish water. Once the water level of the water seal valve breaks down to leak gas, the anti-gas leakage device 8 with water level control will automatically close and control the gas leakage. It will also automatically replenish water until it reaches the effective water level.

When the water seal valve is normally ventilated, the water supply control valve 9 and the water seal cut-off replenishment valve 11 are in the closed position, the anti-gas leakage device 8 with water level control is in the automatic close position, the contact valve 7 is in the open and unblocked state, and the gas drainer The water level is at the height of H2, and its working state is that the condensed water will be automatically discharged through the contact valve 7 when the pipeline is connected to gas. Once the pressure in the pipeline fluctuates, the height of the water level H2 in the drain will be destroyed, and the effective height of H2 will be reduced. When the gas overflows, the gas leaks through the connecting valve 7, which is the problem to be solved by the utility model. The V-shaped water seal valve is provided with a release pipe 11. After cutting off the gas, it is necessary to operate the discharge pipe cut-off device. Due to frequent use or corrosion, the cut-off device is not strict and cannot judge the degree of gas leakage. In case of a thunderstorm, the release pipe catches fire. The problem to be solved by the utility model. The use of ZL 01 2 39576.5 in gas pipeline drains is a very good technology. It can effectively stop gas leakage when the drainer fails, which has been proven by practice. But when this technology is transferred to the water seal valve, it is not applicable, because it relies on the float and internal mechanism to achieve the control of gas leakage. Another disadvantage of the water-sealed valve is that the set gas release pipe, due to the frequent operation in the system, the valve is not closed tightly, resulting in gas leakage. Sudden closing of the valve will lead to major accidents such as flashback and explosion. If the fire is not extinguished in time, other high-altitude equipment will be burned. Timing delayed in processing.

In order to solve these practical shortcomings of the gas water seal valve, it can be considered necessary to invent and research a safe gas water seal cut-off valve, so as to improve the use function of the gas pipeline equipment.

Contents of the invention

The technical problem to be solved by the utility model is that the gas pipeline water seal cut-off valve can also prevent gas leakage during normal ventilation, and can conveniently and quickly extinguish the fire when the release pipe catches fire. The utility model provides a gas pipeline water seal valve, which improves the structure of the original water seal valve so that when the water seal valve does not seal the water, it can still discharge the condensed water in the pipeline when encountering problems such as gas pressure fluctuations. and prevent gas leakage.

The technical measure taken by the utility model is to basically use the original water seal valve technology, and only design a simpler device that can control gas leakage and drain water within the effective height of the water seal valve drainage seal tank. An anti-gas leakage device is provided at the outlet of the sealed tank, and the outlet of the anti-leakage device is connected with an outlet pipe, and a valve is installed at the bottom of the anti-leakage device, which can provide reliable drainage after the water seal valve blocks the gas.

Another technical measure is that the bottom of the release pipe is provided with a 90° symmetrical fire extinguishing device installed in an annular pipe, equipped with a quick connector, so that the release pipe can be quickly connected with nitrogen to extinguish the fire when it catches fire.

The effect of the utility model is: when the mechanism of the water-sealed valve is normally open to the gas, once the drainer breaks down or the system pressure fluctuates, the leakage of the gas can also be stopped by setting a mechanical device.

Another effect: the trapezoidal annular plate and the trapezoidal valve plate of the anti-leakage device have a good sealing effect under the action of the sealing ring.

The effect of setting the special-shaped hinge is that the valve plate can well maintain the opening at a 45° angle through the special-shaped hinge, and the hole distance for the valve plate to move freely is opened at the connection between the special-shaped hinge and the valve plate. The valve plate achieves better sealing.

The feature of the set comparator is: the use of a simple structure with a cover plate and a cavity can not only seal the condensed water of the gas pipeline, but also seal the smell of the gas condensed water, and control the pollution of the environment.

The effect of the provided indicator rod is that the metal balls at both ends of the indicator rod can be screwed and installed, and can conveniently display the use of the leakage prevention device under the cooperation of the comparator and the valve plate.

Another effect of the present invention is that a fire extinguishing device is installed on the release pipe, so that the fire can be extinguished conveniently and quickly when the release pipe catches fire.

The utility model perfects the design of the gas pipeline water-seal cut-off valve attached to the overhead of the iron and steel enterprise, which fundamentally solves the gas leakage problem of the water-sealed cut-off valve, and makes the water-sealed valve have a wider application field and is safer and more reliable.

Description of drawings

Figure 1 is a diagram of the original water seal cut-off valve

Fig. 2 is a schematic diagram of the structure of the utility model

Figure 3 is a schematic diagram of the enlarged structure when the trapezoidal valve plate in "part a" of Figure 2 is closed

Figure 4 is a schematic diagram of the enlarged structure when the trapezoidal valve plate in "part a" of Figure 2 is opened

Figure 5 is a top view of Figure 3

Figure 6 is an enlarged schematic diagram of "Part B" in Figure 4

Figure 7 is an enlarged sectional view of "part c" in Figure 2

Detailed ways

Embodiment description with reference to accompanying drawing 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7

In the figure, 1. Water seal cut-off valve, 2. Upper sewage cut-off device, 3. Vertical sewage pipe, 4. Lower sewage cut-off device, 5. Drain tank, 6. Drain pipe, 7. Contact valve, 8. Belt control Anti-gas leakage device for water level, 9. Water supply control valve, 10. Release pipe, 11. Water seal cut-off water supply valve, 12. Anti-leakage device, 12-1. Trapezoidal valve plate, 12-2. Sealing ring, 12-3 .Comparator, 12-4. Indicator rod, 12-5. Trapezoidal ring plate, 12-6. Special-shaped connector, 12-7. Sealing water, 13. Anti-leakage device contact valve, 14. Outlet pipe, 15. Three Drain pipe, 16 fire extinguishing device, 16-1. Symmetrical ring pipe, 16-2. Quick connector.

The water seal cut-off valve 1 is installed on the gas pipeline, and the upper and lower sewage cut-off devices 2 and 4 provided by the water seal valve are connected to the vertical sewage pipe 3, and the vertical sewage pipe 3 is inserted into the cavity of the drainage tank 5. The other end is provided with a vertically upward drainage pipe 6, and a gas leakage prevention device 8 with a water level control is installed on the top of the drainage pipe 6, and the gas leakage prevention device 8 with a water level control is connected to the water outlet pipe 14. The connecting valve 7 is connected with the three-way drain pipe 15, the three-way drain pipe 15 is connected with the anti-leakage device 12 and the contact valve 13 of the anti-leakage device, the anti-leakage device 12 is connected with the outlet pipe 14, and the inner wall of the anti-leakage device 12 is welded with The trapezoidal ring plate 12-5 that steel plate is made, the internal diameter of trapezoidal ring plate is provided with sealing ring 12-2, is welded with special-shaped connector 12-6 at the bottom edge of trapezoidal ring plate, and valve plate 12-1 is housed in connector, in The upper part of the body of the anti-leakage device 12 is provided with a cover comparator 12-3, the inner cavity of the comparator is equipped with an indicator rod 12-4, and the upper and lower ends of the indicator rod are equipped with screwable metal balls, and the set water supply control valve 9 and the water seal shut-off replenishment valve 11 are respectively connected on the anti-gas leakage device 8 and the water seal shut-off valve 1 body of the band control water level, the water seal shut-off valve body is provided with a discharge pipe 10, and the fire extinguishing device 16 is installed on the discharge pipe , The symmetrical annular pipe 16-1 is installed outside the release pipe, and the annular pipe is equipped with a quick connector 16-2 for quick connection of nitrogen.

The operation process of the utility model is as follows: when the water seal cut-off valve 1 is used to block the gas, the upper and lower sewage cut-off devices 2 and 4 are in the unblocked position, the contact valve 7 and the contact valve 13 of the anti-leakage device are closed, and the water seal is opened to cut off the water supply The valve 11 fills water into the water seal cut-off valve 1. After the water level of the water seal cut-off valve reaches the position of H1, the purpose of the water seal to cut off the gas is achieved, and the water supply control valve 9 is opened to keep the water in the water seal cut-off valve from overflowing. The overflow water flows to the outlet pipe 14 through the anti-gas leakage device 8 with water level control, and because the pressure of the gas pipeline fluctuates with the system changes, a part of the water is washed away, so that the water level in the water seal cut-off valve is lower than the effective height of H1 , the anti-gas leakage device 8 with water level control is set to drive the water valve to replenish water, and the height control device moves to H1, close the water valve and open the anti-gas leakage device 8 with water level control to make it overflow and complete the water seal valve cut-off Gas process.

When the water seal shut-off valve 1 releases water and turns on the gas, close the water supply control valve 9, open the contact valve 7 and the anti-leakage device contact valve 13 to release the water, put the water in the water seal shut-off valve to the height of H2 and close the anti-leakage device contact valve 13. Open the water seal valve of the gas pipeline, and keep the condensed water in the gas discharged into the gas leakage prevention device 12 through the drainage mechanism 2, 3, 4, 5, 6, 7, and the condensed water is discharged through the outlet pipe 14, so The set trapezoidal valve plate 12-1 is under the action of the special-shaped hinge 12-6, as shown in "Part B", so that the trapezoidal valve plate is kept at an opening of 45°, and the condensed water 12-7 can be effectively discharged. The rod 12-4 passes through the cavity of the cover plate comparator 12-3, the sphere at the bottom end rests on the valve plate at will, and the sphere at the upper end is larger than the inner diameter of the cavity of the comparator and rests freely on the end, its function is to prompt The anti-leakage device of the operator is working normally. When the system pressure is too high or the effective height of H2 is damaged and the water overflows and the gas leaks, the trapezoidal valve plate 12-1 moves upward quickly under the action of the gas pressure to make it annular Plate sealing, reaches the purpose that prevents from leaking gas, for prompting the operator's indicating rod 12-4 moves upwards thereupon and warns that this device can't work normally.

Another embodiment is; on the upper part of the cut-off device of the release pipe, the symmetrical annular pipe 16-1 is welded and installed on the pipe wall. When the release pipe catches fire, it is not necessary to close the cut-off device, and the quick connector 16-2 is connected to the nitrogen pipe to achieve The purpose of quickly extinguishing the fire.

Claims (2)

1, a kind of gas pipe line water-sealing valve, the water seal cut-off valve is installed on the gas pipe line, water-sealing valve set on, the down blow shut-off means connects vertical drain pipe, the displacement can cavity that vertical drain pipe is inserted into, the waste pipe vertically upward that is provided with at the other end of displacement can, water seal is cut off water-feeding valve and is connected with water supply control valve by pipeline, the gas leakage preventing device of band control water level is housed at the top of waste pipe, the gas leakage preventing device of band control water level connects outlet pipe, be connected with communication valve between waste pipe and the outlet pipe, water seal cut-off valve body is provided with exhaust stack, it is characterized in that, at the waste pipe intermediate section communication valve being housed is connected with the threeway waste pipe, the threeway waste pipe connects leakage preventer and leakage preventer communication valve, leakage preventer is connected with outlet pipe, the leakage preventer internal chamber wall is welded with the trapezoidal ring flat-plate that steel plate is made, trapezoidal ring flat-plate internal diameter is provided with seal ring, bottom margin at trapezoidal ring flat-plate is welded with special-shaped link, link is equipped with valve plate, the cover plate that is provided with on the body top of leakage preventer is according to device, according to the device inner chamber indicating arm is housed, indicating arm up and down two ends is equipped with the metal ball that can spin, set water supply control valve and water seal cut off water-feeding valve be connected to the band control water level gas leakage preventing device and water seal cut-off valve body on.

2, a kind of gas pipe line water-sealing valve according to claim 1, it is characterized in that fire-fighting equipment is installed, and fire-fighting equipment is made of symmetrical ring pipe and rapid pipe joint on exhaust stack, the symmetry ring pipe is installed in the exhaust stack outside, and ring pipe is equipped with the rapid pipe joint of quick connection nitrogen.

Images