Large-diameter oil pipeline safety valve resistant to high pressure difference fluctuation
By employing a stepped pressure-reducing valve core and regulating components in oil pipeline safety valves, the problems of valve core vibration and sealing surface wear caused by high-pressure fluid impact have been solved, resulting in a longer service life and greater stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 宋利强
- Filing Date
- 2025-08-21
- Publication Date
- 2026-06-26
AI Technical Summary
Under the impact of high-pressure fluids, the single-stage valve core of existing safety valves for oil pipelines vibrates violently, the sealing surface wears faster, and the service life is affected.
The valve core and regulating components are stepped pressure reducing. The position of the sealing block is adjusted by knob and screw to achieve stepped pressure reduction, avoiding the instantaneous impact of high pressure fluid on the valve core. The movement of the stepped pressure reducing valve core is used to achieve pressure relief and closure.
It effectively reduces valve core vibration and sealing surface wear, extends service life, and improves the stability and durability of the safety valve.
Smart Images
Figure CN224414441U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of petroleum safety valve technology, and in particular to a safety valve for large-diameter oil pipelines that is resistant to high pressure differential fluctuations. Background Technology
[0002] Currently, most safety valves used in oil pipelines employ a spring to apply pressure to the valve core, thereby achieving pressure control. This type of safety valve is only suitable for oil pipelines with a single pressure, and after long-term use, the spring is prone to fatigue, causing a decrease in the internal pressure of the safety valve and affecting its sealing performance.
[0003] To address the aforementioned issues, existing patent (CN223035792U) discloses a safety valve for oil pipelines, comprising a safety valve body. The safety valve body includes a negative pressure pipeline, a pressure relief pipeline, and a first sealing ring, with the first sealing ring located above the junction of the negative pressure pipeline and the pressure relief pipeline. A sealing valve body is positioned at the top of the negative pressure pipeline, and a valve core is located inside the negative pressure pipeline. A sealing strip is located at the end of the negative pressure pipeline near the sealing valve body. A push rod is positioned at the top of the valve core. The sealing valve body includes a sealing pipeline and a second sealing ring. A handwheel screw assembly is positioned at the top of the sealing pipeline, a tightening nut is located on the outside of the sealing pipeline, and a sealing block is located on the inside of the sealing pipeline. A movable block is located at the bottom of the sealing block, positioned above the second sealing ring. Through this structure, this invention can quickly adjust the internal pressure of the sealing valve body, thereby achieving safety protection for oil pipelines with different pressures and improving the stability of the safety valve.
[0004] However, in the aforementioned prior art, when a single-stage valve core is depressurized, the high-pressure fluid instantly impacts the inclined surface of the valve core, causing severe vibration of the valve core, accelerated wear of the sealing surface, and affecting its service life. Utility Model Content
[0005] The purpose of this utility model is to provide a safety valve for large-diameter oil pipelines that is resistant to high pressure differential fluctuations. This solves the technical problem in the prior art where, when a single-stage valve core is depressurized, the high-pressure fluid instantly impacts the inclined surface of the valve core, causing severe vibration of the valve core, accelerated wear of the sealing surface, and affecting the service life.
[0006] To achieve the above objectives, this utility model employs a large-diameter oil pipeline safety valve resistant to pressure differential fluctuations, comprising a safety valve body and a pressure relief structure; the pressure relief structure includes a pressure relief pipe, a stepped pressure reducing valve core, and an adjusting assembly. The pressure relief pipe is fixedly connected to the safety valve body and located on one side of the safety valve body. The stepped pressure reducing valve core is slidably connected to the safety valve body and located within the safety valve body. The adjusting assembly includes a knob, a lead screw, a sealing block, several disc springs, a movable block, and a locking component. The lead screw is connected to the safety valve body... The entire valve body is detachably connected and located at the upper end of the safety valve body, penetrating the safety valve body. The knob is fixedly connected to the lead screw and located at the upper end of the lead screw. The sealing block is rotatably connected to the lead screw and located at the lower end of the lead screw. The movable block is connected to the sealing block through several disc springs. The stepped pressure reducing valve core is fixedly connected to the movable block and located at one end of the movable block. The locking member is detachably connected to the safety valve body and located at one end of the safety valve body, cooperating with the lead screw.
[0007] The stepped pressure reducing valve core has a stepped cylinder, a first-stage throttling shroud, a second-stage throttling shroud, and a third-stage throttling shroud. The first-stage throttling shroud, the second-stage throttling shroud, and the third-stage throttling shroud are respectively fixedly connected to the stepped cylinder and are evenly arranged on the stepped cylinder.
[0008] The locking component includes a mounting block and a turntable. The mounting block is fixedly connected to the safety valve body and located at one end of the safety valve body. The turntable is rotatably connected to the mounting block and located at one end of the mounting block.
[0009] The locking component further includes a gear, two racks, and two latches. The gear, the two racks, and the two latches are respectively disposed on the mounting block. The gear is fixedly connected to the turntable and is located at one end of the gear. The two racks are symmetrically meshed with the gear. Each latch is fixedly connected to the corresponding rack and is located at one end of the corresponding rack.
[0010] The locking component further includes two return springs. One end of each return spring is fixedly connected to the mounting block and is symmetrically arranged at one end of the mounting block. The other end of each return spring is fixedly connected to the corresponding latch and is located at one end of the corresponding latch.
[0011] This utility model discloses a safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations. In practical use, the locking mechanism releases the lead screw, and then the knob is rotated. The knob drives the lead screw to rotate, thereby adjusting the position of the sealing block within the safety valve body. This changes the internal pressure of the safety valve body, which is transmitted to the movable block. The movable block moves the stepped pressure-reducing valve core, achieving its opening and closing. When the oil pressure in the negative pressure pipeline is greater than the pressure inside the sealed pipeline, the oil is discharged from the pressure relief pipeline through the stepped pressure-reducing valve core, completing the pressure relief. When the pressure in the negative pressure pipeline is less than the pressure inside the sealed pipeline, the movable block presses down the stepped pressure-reducing valve core, causing it to close again and blocking the pressure relief pipeline. This method effectively solves the problem that when a single-stage valve core releases pressure, the high-pressure fluid instantly impacts the valve core's inclined surface, causing severe valve core vibration, accelerated wear of the sealing surface, and reduced service life. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a schematic diagram of the structure of a safety valve for a large-diameter oil pipeline that is resistant to high pressure differential fluctuations, according to this utility model.
[0014] Figure 2 This is a side view of a safety valve for a large-diameter oil pipeline that is resistant to high pressure differential fluctuations, according to this utility model.
[0015] Figure 3 This is the utility model Figure 2 A cross-sectional view of the AA line structure.
[0016] Figure 4 This is the utility model Figure 2 BB line structural cross-sectional view.
[0017] 101-Safety valve body, 102-Pressure relief pipe, 103-Knob, 104-Screw, 105-Sealing block, 106-Disc spring, 107-Moving block, 108-Stepped cylinder, 109-First-stage throttling shroud, 110-Second-stage throttling shroud, 111-Third-stage throttling shroud, 112-Mounting block, 113-Turntable, 114-Gear, 115-Rack, 116-Lock, 117-Reset spring. Detailed Implementation
[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0019] Please see Figures 1-4 ,in Figure 1 This is a schematic diagram of the structure of a large-diameter oil pipeline safety valve resistant to high pressure differential fluctuations according to this utility model. Figure 2 This is a side view of a large-diameter oil pipeline safety valve resistant to high pressure differential fluctuations according to this utility model. Figure 3 This is the utility model Figure 2 AA-line structural cross-sectional view, Figure 4 This is the utility model Figure 2 BB line structural cross-sectional view.
[0020] This utility model provides a safety valve for a large-diameter oil pipeline that is resistant to pressure differential fluctuations, including a safety valve body 101, a pressure relief pipe 102, a knob 103, a lead screw 104, a sealing block 105, a disc spring 106, a movable block 107, a stepped cylinder 108, a first-stage throttling hood 109, a second-stage throttling hood 110, a third-stage throttling hood 111, a mounting block 112, a turntable 113, a gear 114, a rack 115, a latch 116, and a return spring 117. The aforementioned solution solves the problem that when a single-stage valve core is depressurized, the high-pressure fluid instantly impacts the inclined surface of the valve core, causing severe vibration of the valve core, accelerated wear of the sealing surface, and affecting the service life.
[0021] In this specific embodiment, the pressure relief structure includes a pressure relief pipe 102, a stepped pressure reducing valve core, and an adjusting assembly. The pressure relief pipe 102 is fixedly connected to the safety valve body 101 and located on one side of the safety valve body 101. The stepped pressure reducing valve core is slidably connected to the safety valve body 101 and located inside the safety valve body 101. The adjusting assembly includes a knob 103, a lead screw 104, a sealing block 105, several disc springs 106, a movable block 107, and a locking element. The lead screw 104 is detachably connected to the safety valve body 101 and positioned... At the upper end of the safety valve body 101, and penetrating through the safety valve body 101, the knob 103 is fixedly connected to the lead screw 104 and located at the upper end of the lead screw 104. The sealing block 105 is rotatably connected to the lead screw 104 and located at the lower end of the lead screw 104. The movable block 107 is connected to the sealing block 105 through several disc springs 106. The stepped pressure reducing valve core is fixedly connected to the movable block 107 and located at one end of the movable block 107. The locking member is detachably connected to the safety valve body 101 and located at the upper end of the safety valve body 101. One end of the safety valve body 101 is connected to the lead screw 104. The safety valve body 101 is provided by prior art patent CN223035792U. The lead screw 104 is released by the locking member, and then the knob 103 is rotated. The knob 103 drives the lead screw 104 to rotate, thereby adjusting the position of the sealing block 105 inside the safety valve body 101, thereby changing the pressure inside the safety valve body 101. The pressure is transmitted to the movable block 107, which drives the stepped pressure reducing valve core to move, realizing the stepped pressure reduction valve core. When the pressure of the oil in the negative pressure pipeline is greater than the pressure inside the sealed pipeline, the oil is discharged from the pressure relief pipeline 102 through the stepped pressure reducing valve core, thus completing the pressure relief. When the pressure inside the negative pressure pipeline is less than the pressure inside the sealed pipeline, the movable block 107 presses down the stepped pressure reducing valve core, causing it to close again and blocking the pressure relief pipeline 102. This method can effectively solve the problem that when a single-stage valve core releases pressure, the high-pressure fluid instantly impacts the inclined surface of the valve core, causing severe vibration of the valve core, accelerated wear of the sealing surface, and affecting its service life.
[0022] The stepped pressure reducing valve core comprises a stepped cylinder 108, a first-stage throttling shroud 109, a second-stage throttling shroud 110, and a third-stage throttling shroud 111. The stepped cylinder 108 is fixedly connected to the movable block 107 and located at one end of the movable block 107. The first-stage throttling shroud 109, the second-stage throttling shroud 110, and the third-stage throttling shroud 111 are respectively fixedly connected to the stepped cylinder 108 and are evenly distributed on the stepped cylinder 108. The stepped cylinder 108 has a length of 150–200 mm, and the inner diameter of the first-stage throttling shroud 109 is 50 mm. The secondary throttling shroud 110 has an inner diameter of 75mm, and the tertiary throttling shroud 111 has an inner diameter of 110mm. The distance between adjacent throttling shrouds is 30mm, forming a two-stage annular throttling channel. Each of the three throttling shrouds has several throttling holes with diameters of 8mm, 12mm, and 16mm, respectively. The hole axis forms a 15° angle with the radial direction, guiding the fluid to spirally reduce pressure. The single-stage pressure drop ratio is strictly controlled within 1:3. The bottom of the valve core is provided with a stepped cylindrical guide rod (diameter 30mm), which slides with the guide sleeve in the main pipeline (fitting clearance 0.1~0.2mm) to ensure that the valve core rises and falls smoothly without swaying.
[0023] Secondly, the locking component includes a mounting block 112 and a turntable 113. The mounting block 112 is fixedly connected to the safety valve body 101 and is located at one end of the safety valve body 101. The turntable 113 is rotatably connected to the mounting block 112 and is located at one end of the mounting block 112. When the turntable 113 is rotated, the turntable 113 rotates on the mounting block 112.
[0024] Meanwhile, the locking device also includes a gear 114, two racks 115, and two latches 116. The gear 114, the two racks 115, and the two latches 116 are respectively disposed on the mounting block 112. The gear 114 is fixedly connected to the turntable 113 and is located at one end of the gear 114. The two racks 115 are symmetrically meshed with the gear 114. Each latch 116 is fixedly connected to the corresponding rack 115 and is located at one end of the corresponding rack 115. The turntable 113 drives the gear 114 to rotate, the gear 114 drives the two racks 115 to move relative to each other, and the two racks 115 drive the two latches 116 to move relative to each other.
[0025] In addition, the locking device also includes two return springs 117. One end of each return spring 117 is fixedly connected to the mounting block 112 and is symmetrically arranged at one end of the mounting block 112. The other end of each return spring 117 is fixedly connected to the corresponding latch 116 and is located at one end of the corresponding latch. The two latches 116 press the two return springs 117 together.
[0026] In the application of the large-diameter oil pipeline safety valve resistant to pressure differential fluctuations according to this embodiment, rotating the turntable 113 drives the gear 114 to rotate, which in turn drives the two racks 115 to move relative to each other. The two racks 115 then drive the two latches 116 to move relative to each other, causing the two latches 116 to press against the two return springs 117, thereby releasing the lead screw 104. Then, rotating the knob 103 drives the lead screw 104 to rotate, thereby adjusting the position of the sealing block 105 within the safety valve body 101, thus changing the pressure inside the safety valve body 101. The force is transmitted to the movable block 107, which drives the stepped pressure reducing valve core to move, thereby closing or opening the stepped pressure reducing valve core. When the pressure of the oil in the negative pressure pipeline is greater than the pressure inside the sealed pipeline, the oil is discharged from the pressure relief pipeline 102 through the stepped pressure reducing valve core, completing the pressure relief. When the pressure inside the negative pressure pipeline is less than the pressure inside the sealed pipeline, the movable block 107 presses down the stepped pressure reducing valve core, and the stepped pressure reducing valve core closes again, blocking the pressure relief pipeline 102. This method can effectively solve the problem that when a single-stage valve core is depressurized, the high-pressure fluid instantly impacts the inclined surface of the valve core, causing severe vibration of the valve core, accelerated wear of the sealing surface, and affecting the service life.
[0027] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.
Claims
1. A safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations, characterized in that, Including the safety valve body, It also includes pressure relief structures; The pressure relief structure includes a pressure relief pipe, a stepped pressure reducing valve core, and an adjusting assembly. The pressure relief pipe is fixedly connected to the safety valve body and located on one side of the safety valve body. The stepped pressure reducing valve core is slidably connected to the safety valve body and located inside the safety valve body. The adjusting assembly includes a knob, a lead screw, a sealing block, several disc springs, a movable block, and a locking component. The lead screw is detachably connected to the safety valve body and located at the upper end of the safety valve body, penetrating through the safety valve body. The knob is fixedly connected to the lead screw and located at the upper end of the lead screw. The sealing block is rotatably connected to the lead screw and located at the lower end of the lead screw. The movable block is connected to the sealing block through several disc springs. The stepped pressure reducing valve core is fixedly connected to the movable block and located at one end of the movable block. The locking component is detachably connected to the safety valve body and located at one end of the safety valve body, cooperating with the lead screw.
2. The safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations as described in claim 1, characterized in that, The stepped pressure reducing valve core has a stepped cylinder, a first-stage throttling shroud, a second-stage throttling shroud, and a third-stage throttling shroud. The first-stage throttling shroud, the second-stage throttling shroud, and the third-stage throttling shroud are respectively fixedly connected to the stepped cylinder and are evenly arranged on the stepped cylinder.
3. The safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations as described in claim 2, characterized in that, The locking component includes a mounting block and a turntable. The mounting block is fixedly connected to the safety valve body and located at one end of the safety valve body. The turntable is rotatably connected to the mounting block and located at one end of the mounting block.
4. The safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations as described in claim 3, characterized in that, The locking component also includes a gear, two racks, and two latches. The gear, the two racks, and the two latches are respectively disposed on the mounting block. The gear is fixedly connected to the turntable and is located at one end of the gear. The two racks are symmetrically meshed with the gear. Each latch is fixedly connected to the corresponding rack and is located at one end of the corresponding rack.
5. The safety valve for large-diameter oil pipelines resistant to high pressure differential fluctuations as described in claim 4, characterized in that, The locking component also includes two return springs. One end of each return spring is fixedly connected to the mounting block and is symmetrically arranged at one end of the mounting block. The other end of each return spring is fixedly connected to the corresponding latch and is located at one end of the corresponding latch.