CN213176918U

CN213176918U - Lifting check valve with cambered surface seal

Info

Publication number: CN213176918U
Application number: CN202021661493.0U
Authority: CN
Inventors: 徐东; 吴伟; 代伟; 王珂; 王晓飞; 邹瑜; 孙存波; ***强
Original assignee: China Petroleum and Chemical Corp; Sinopec Shengli Oilfield Co Qinghe Oil Extraction Plant
Current assignee: China Petroleum and Chemical Corp; Sinopec Shengli Oilfield Co Qinghe Oil Extraction Plant
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-05-11
Anticipated expiration: 2030-08-11

Abstract

The utility model provides a sealed over-and-under type check valve of cambered surface, which comprises a valve body, the valve gap, the disk seat, the case, guide bar and guide cylinder, the valve gap passes through the bolt with valve body open-top and links to each other, the guide cylinder is fixed in the valve gap center, the runner middle part of valve body is installed to the disk seat, the case is arranged with the disk seat phase, the bottom of guide bar links to each other with case top surface center, the guide cylinder is inserted to the guide bar top, reciprocate along the guide cylinder, the sealed face of case is the arcwall face of underbending, the disk seat is the arcwall face of indent with the contact surface of case, laminate mutually. The utility model discloses make the reverse uniflow nature of check valve and security more reliable, it is more convenient to maintain, clear up the operation, prolongs check valve life simultaneously.

Description

Lifting check valve with cambered surface seal

Technical Field

The utility model belongs to the technical field of the valve, especially, relate to a cambered surface sealed over-and-under type check valve.

Background

Since the twenty-first century, the world petrochemical industry gradually shifts to China, China has become a world large country for producing petrochemical products, the crude oil processing capacity and the ethylene production capacity now live in the second place and the third place around the world and are further increased, petrochemical equipment in China depends on import for a long time, and special valves on some important processes are imported. The inlet valve is not only expensive, but also inconvenient to replace when in maintenance.

At present, in oil field production, in order to ensure safe operation of crude oil output equipment and an oil transportation system, a check valve is installed at an outlet end. The check valve is used for automatically opening and closing the valve clack by the flowing of the medium, and mainly has the functions of preventing the medium from flowing backwards, preventing the pump and the driving motor from reversing, discharging the medium in the container and the like. As known, most of check valves installed at the outlet end of oil transportation equipment adopt lift check valves, medium parameters (flow and pressure) in a pipeline are periodically changed at high frequency, valve cores of the check valves are not limited, the positions of the valve cores of the check valves are changed along with the change of fluid parameters, and the valve cores of the lift check valves are reflected in rapid vertical reciprocating motion, so that the lift check valves have the problems of short service life, poor anti-check performance, damage to external transportation equipment after the check valves fail, and pollution to the environment due to the fact that sealing surfaces in the check valves are easy to damage, valve core guide rods are broken, the check valves are difficult to maintain and the like in the use process.

Disclosure of Invention

The utility model aims to solve the technical problem that the problem that exists provides a cambered surface sealing's over-and-under type check valve to the aforesaid, through changing check valve sealing mode and structure, makes the anti-uniflow nature of check valve and security more reliable, and it is more convenient to maintain, clear up the operation, prolongs check valve life simultaneously, provides the assurance for oil transportation equipment even running.

The utility model provides a technical scheme that above-mentioned technical problem adopted is: the lifting check valve with the cambered surface seal comprises a valve body, a valve cover, a valve seat, a valve core, a guide rod and a guide cylinder, wherein a valve inlet and a valve outlet are respectively arranged on the left side and the right side of the valve body, a flow channel is formed inside the valve body, the valve cover is connected with an opening at the top of the valve body through a bolt, the guide cylinder is fixed at the center of the valve cover, the valve seat is arranged in the middle of the flow channel of the valve body, a valve cavity is formed between the valve seat and the valve cover, the valve core is matched with the valve seat, the bottom end of the guide rod is connected with the center of the top surface of the valve core, the top of the guide rod is inserted into the guide cylinder and moves up and down along the guide cylinder to drive the valve core to move up and down in the valve cavity to communicate or cut off the flow channel.

According to the scheme, the magnetic attraction fastening device is a magnetic ring, an annular notch is formed in the mounting surface of the valve seat and the valve body, and the magnetic ring is embedded in the annular notch.

According to the scheme, the valve core is sleeved with the rubber sleeve.

According to the scheme, the valve seat is made of high-strength steel.

According to the scheme, the valve core and the guide rod are both made of stainless steel, and the valve core is connected with the guide rod in a welding mode.

The utility model has the advantages that: the utility model provides a sealed up-down check valve of cambered surface, change up-down check valve sealing method and structure, adopt the valve ball to seal with the sealed principle of valve seat, make the anti-uniflow nature of check valve more reliable, increase an arc rubber sleeve on the case simultaneously, prevent that case and disk seat from receiving the influence of gas-liquid and producing the metal striking, the sealed face of protection, the life-span of extension case and disk seat, the disk seat is fixed in the valve body through magnetism device of inhaling, when the check valve device inefficacy is maintained, only need take out its annex and change, the operation, it is convenient to maintain, effectively reduce manual operation cost and material cost, reduce workman intensity of labour. Safe production is realized, and equipment failure and crude oil leakage pollution accidents are reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

For a better understanding of the present invention, the following description is given in conjunction with the accompanying drawings and examples.

As shown in figure 1, the lifting check valve with the cambered surface sealing comprises a valve body 1, a valve cover 2, a valve seat 3, a valve core 4, a guide rod 5 and a guide cylinder 6, wherein the left side and the right side of the valve body are respectively provided with a valve inlet and a valve outlet, a flow passage is arranged inside the valve body, the valve cover is connected with an opening at the top of the valve body through a bolt 7, the guide cylinder is fixed at the center of the valve cover, the valve seat is arranged in the middle of the flow passage of the valve body, a valve cavity is formed between the valve seat and the valve cover, the valve core is matched with the valve seat, the bottom end of the guide rod is connected with the center of the top surface of the valve core, the top of the guide rod is inserted into the guide cylinder and moves up and down along the guide cylinder to drive the valve core to move up and down in the valve cavity to communicate or cut off the flow passage, the sealing surface of the valve core is a downward convex arc, the sealing performance is better when anti single current, is equipped with magnetism on the disk seat and inhales fastener, inhales through magnetism and fixes a position the disk seat.

The installation face of disk seat and valve body is gone up to open has annular notch 8, and the annular notch is inlayed and is equipped with magnetic ring 9, and the disk seat passes through magnetism with the valve body and inhales the location, and the original sealed face of protection check valve, only need when the disk seat became invalid take out the disk seat can.

The rubber sleeve 10 is sleeved outside the valve core, so that the sealing performance of the valve core and the valve seat is enhanced, metal impact caused by the influence of gas and liquid on the valve core and the valve seat is prevented, a sealing surface is protected, and the service life of the valve core and the valve seat is prolonged.

The valve seat is made of high-strength steel, and the valve seat is guaranteed to be fixed on the check valve body under the action of strong magnetism.

The valve core and the guide rod are both made of stainless steel, the corrosion resistance of the valve core is enhanced, the influence of strong magnetism is avoided, and the valve core is connected with the guide rod in a welding mode.

When the oil transportation equipment normally operates, flowing media enter the inlet of the check valve from the outlet of the pump, when the pressure of the inlet end of the check valve is greater than the pressure of the outlet end of the check valve and the self weight of the valve core, the valve core is jacked up by liquid flow, the guide rod on the surface of the valve core moves upwards under the limitation of the guide cylinder, a channel is formed at the moment, and the liquid flow flows into the outlet of the check valve from the valve seat. When the oil transportation equipment stops operating due to a fault, the flowing medium in the pipeline flows backwards rapidly, the pressure of the outlet end of the check valve is larger than that of the inlet end of the check valve, the liquid flow is reversed under the action of pressure difference, the valve core is subjected to the downward force of the liquid flow at the moment, the guide rod on the surface of the valve core moves downwards under the limitation of the guide cylinder, the cambered surface of the valve core and the cambered surface of the valve seat interact to seal when the valve core falls down, the channel is closed, and single flow is realized.

When the check valve needs to be maintained and cleaned, the check valve cover plate is detached, the valve core is taken out by a tool, and the check valve is checked and cleaned. If the valve core rubber sleeve is damaged, the valve core rubber sleeve is taken out for replacement, and if the sealing surface of the valve seat is damaged, the old valve seat and the magnetic ring are taken out.

The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.

Claims

1. A lifting check valve with cambered surface sealing comprises a valve body, a valve cover, a valve seat, a valve core, a guide rod and a guide cylinder, the left side and the right side of the valve body are respectively provided with a valve inlet and a valve outlet, a flow passage is arranged in the valve body, the valve cover is connected with the top opening of the valve body through a bolt, the guide cylinder is fixed at the center of the valve cover, the valve seat is arranged in the middle of the flow passage of the valve body, a valve cavity is formed between the valve seat and the valve cover, the valve core is matched with the valve seat, the bottom end of the guide rod is connected with the center of the top surface of the valve core, the top of the guide rod is inserted into the guide cylinder and moves up and down along the guide cylinder to drive the valve core to move up and down in the valve cavity to connect or cut off the flow passage, the magnetic valve is characterized in that the sealing surface of the valve core is a downward convex arc-shaped surface, the contact surface of the valve seat and the valve core is a concave arc-shaped surface and is attached to the sealing surface of the valve core, and the valve seat is provided with a magnetic suction fastening device.

2. The lift check valve with cambered surface seal according to claim 1, wherein the magnetic attraction fastening device is a magnetic ring, an annular notch is formed in the mounting surface of the valve seat and the valve body, and the magnetic ring is embedded in the annular notch.

3. The lift check valve with cambered surface seal according to claim 2, wherein the valve core is sleeved with a rubber sleeve.

4. The cambered surface sealed lift check valve of claim 1 or 3 wherein the valve seat is made of high strength steel.

5. The lift check valve with cambered surface seal according to claim 4, wherein the valve core and the guide rod are both made of stainless steel, and the valve core is welded with the guide rod.