Ball valve with pressure relief valve

Abstract

The utility model relates to pipeline valves, specifically to their use as a device for changing the flow direction of a working fluid in turbo-piston units included in systems for measuring the quantity and quality of oil and petroleum products. A ball valve with a pressure relief valve further comprises a pressure relief valve, where the working cavity of the plug is connected to a channel in the safety valve body, which, in turn, is connected to a cavity with an external outlet formed in the safety valve body for pressure relief, which, in turn, is connected to a cavity with an external outlet formed in the safety valve body for pressure relief. An adjusting screw, a spring, a valve stem, a spool valve, and a cage are installed in the valve body.The technical result is to increase the operational reliability of the ball valve by using a safety valve design with adjustable opening pressure. 2 references, 5 figs.

Description

[0001] Technical field

[0002] The utility model relates to pipeline fittings intended for use as a device for changing the direction of the flow of the working medium in turbo-piston units included in systems for measuring the quantity and quality of oil and oil products, in particular to a ball valve.

[0003] Technology Level

[0004] Ball valves with a decompression function are known from the prior art, where a standard ball valve with a circulation channel and a manual drive is supplemented by an upper piston chamber with a relief hole and a piston kinematically connected through a connecting rod with a “punch holder - die holder” unit and a fixed stage clamp, which ensures a controlled release of pressure from the cavity.

[0005] For example, a patent by Tianjin Jingwo Valves Technology Co Ltd, CN 204061967 (priority date July 10, 2014), is known for a ball valve with a decompression function. It includes a valve body, a flange, a spool, and a circulation channel. The two ends of the valve body are equipped with a connecting flange. The inner part of the valve body is equipped with a spool, the inner part of the spool provides a circulation channel, the lower end of the spool is equipped with a valve stem, and the lower end of the valve stem is connected to a switch handle. The disadvantage of this solution is its lack of reliability due to the removal of the spring element from the stem body, the complexity of the design itself, and the presence of a control stem, which is connected to an external structure. The proposed solution lacks a control stem, and the spring tension is adjusted using only one component - a screw.The entire design is simplified and housed in a housing, allowing it to be used in any external operating conditions and increasing reliability.

[0006] A similar structure is disclosed in CN Patent 204061971 for a ball valve structure, owned by Zhejiang Hengke Valve Technology Co Ltd, priority date 01 / 09 / 2014, which includes a ball valve structure, with a valve body, the location of the valve clearance neck is provided with a filler, is provided with a filler compression sleeve above the filler, is provided with a pressure grid above the filler compression sleeve, the handle is located at the upper position of the valve stem, and the pressure regulating rod is located above the compression spring and is a hollow cylindrical fitting mounted on the valve stem; the pressure regulating rod is made of plastic, and this hollow cylindrical fitting is made of two semicircular hollow pipe fittings and the valve stem are provided with a counter thread, and the upper part of the pressure regulating rod is provided with a pressure regulating handle.The disadvantage of this solution is the use of plastic components, such as the pressure control rod, which do not interact well with metal at high pressure and / or temperature, and also exhibit poor performance in oil and gas environments, and the fact that the fitting is made of two halves reduces reliability.

[0007] Also closely related is patent CN 105202217, owned by Wuxi Yanggong Machinery Manufacturing Co Ltd. The ball valve has a ball-type pressure relief valve with a decompression function, comprising a valve body, a spool, and a handle. The middle portion of the described valve body serves as the valve pocket, the spool is located inside the valve body, and the described handle is rigidly connected to the coil. The pressure relief valve consists of a body, a guide, a disc, and a spring. The technical problem with this solution is the inability to adjust the opening pressure of the pressure relief valve and the rigid, non-detachable connection between the ball and the handle.

[0008] Patent RU 58647, priority date May 19, 2006, is proposed as the technical solution closest to the claimed utility model (prototype). The ball valve consists of a body and side branches. The branches are secured to the body with bolts. Fluoroplastic seals are pressed against the ball plug. The connection between the body and branches is sealed with a fluoroplastic gasket. The spindle has an elongated middle section. The valve is equipped with a column secured to the body flange, and the spindle is located inside the column. At the top of the column is a spindle seal assembly consisting of a pack of fluoroplastic washers and a cover, tightened with bolts screwed into the column flange. The column and the body flange are connected to each other with nuts and studs. The spindle drive assembly includes a handle and a stop secured to the end of the spindle. The technical problem with the solution under patent RU 58647 is the lack of the ability to automatically release pressure from the ball valve body.

[0009] The technical result is to increase the reliability of the ball valve operation by using a safety valve design with the ability to adjust the opening pressure.

[0010] Essence Revealed

[0011] The technical result is achieved by using a ball valve containing a safety valve in its design, which removes excess pressure from the ball plug through a cavity with an external outlet, minimizing damage to the plug, distortions and jamming in the valve structure and increasing the reliability of the ball valve.

[0012] The design of the ball valve with a pressure relief valve consists of two main parts: the ball valve itself and the built-in safety valve, structurally connected into one product, while the design of the valve includes a ball plug, the position of which is controlled by a handle, while the plug has an opening through which the working medium enters the body of the safety valve, which, in turn, is connected to the cavity with an external outlet made in the body of the safety valve for pressure relief.

[0013] The difference between the claimed utility model and the prototype is the placement of a safety device on the body of the ball valve, which allows for the release of excess pressure and has the ability to adjust the valve opening pressure.

[0014] Brief description of drawings

[0015] Fig. 1 - general view of a ball valve with a pressure relief valve.

[0016] Fig. 2 - pressure relief valve design.

[0017] Fig. 3 - 3D model of the valve in section.

[0018] Fig. 4 - 3D model of the valve in section, front view.

[0019] Fig. 5 - valve stroke, left - closed position, right - open position, where

[0020] 1 - ball valve body;

[0021] 2 - ball plug;

[0022] 3 - flange;

[0023] 4 - ball plug seal;

[0024] 5 - tap stem;

[0025] 6 - flange connection of the "protrusion / recess" type;

[0026] 7 - fastening;

[0027] 8 - flange joint seal;

[0028] 9 - rack;

[0029] 10 - oil seal;

[0030] 11 - handle;

[0031] 12 - safety valve;

[0032] 13 - valve body;

[0033] 14 - valve stem;

[0034] 15 - cell;

[0035] 16 - spool;

[0036] 17 - glass;

[0037] 18 - spring;

[0038] 19 - adjusting screw;

[0039] 20 - valve cover;

[0040] 21 - channel;

[0041] 22 - cavity with external outlet.

[0042] Implementation

[0043] The design of the ball valve with pressure relief valve consists of two main parts: the ball valve itself and the built-in safety valve, structurally connected to each other by fastening (studs) and located in the same body.

[0044] Body 1 of the ball valve serves as the load-bearing component and contains the internal fluid passage. Body 1 ensures the valve's tightness and mechanical strength and is made of metal.

[0045] Ball plug 2 is a spherical component with a hollow cylindrical bore matching the diameter of the hole in flange 3. By rotating 90 degrees around its axis, the plug either blocks the flow or opens the passage. The working cavity of the ball plug is the part of the valve body, plug, and cylindrical bore that are engaged when ball plug 2 rotates. Flange 3 has a complex shape: a flat ring in contact with ball plug 2, protrusions for fixing to the body of valve 1 by fastener 7, and an outlet for connecting the ball valve to the pipeline. Flange 3 ensures a strong and tight fastening through the flange joint by compressing seal 8. The body of flange 3 has grooves for installing seals 4 in the area of ​​contact with ball plug 2.The seal of the ball plug 4 is an annular element made of a dense material with a low coefficient of friction and high heat resistance characteristics, preferably fluoroplastic, the seal fits tightly to the surface of the ball plug 2, preventing leakage of the medium in the closed position.

[0046] The tap stem 5 transmits the rotational movement from the handle 11 to the ball plug 2, ensures reliable fixation and rotation of the plug 2, the stem is located in the stand 9 with the possibility of unimpeded rotation.

[0047] Many ball valve connections are designed with a male / female flange joint 6. This joint consists of two flat elements. To enhance the connection's reliability, one element has a male flange and the other has a similar female flange. The female flange is slightly deeper to accommodate a flange seal 8. This gasket, typically made of expanded graphite, fills the gap between the flanges and prevents leakage. Each flange joint is secured with a fastener 7, which is secured with studs, ensuring a strong connection.

[0048] Stand 9 for valve stem 5 maintains the valve stem position and prevents lateral movement, increasing the durability of the mechanism. The stand houses seal 10, which surrounds valve stem 5 near handle 11 and is secured by fastener 7, preventing the working fluid from escaping from the valve body when valve stem 5 rotates. Movement of the ball plug is transmitted mechanically through handle 11, a control element the operator uses to manually rotate the stem and ball plug to open or close the valve.

[0049] The pressure relief valve 12 has a pressure relief valve body, which is connected to the ball valve body 1 to relieve excess pressure. It prevents emergency situations by reducing the pressure to the rated value. The pressure relief valve has a valve body that houses all internal components and consists of an upper valve body 13, a bowl 17, and a valve cover 20, which are connected in series with each other by detachable joints. The upper valve body 13 is connected to the valve body 1.

[0050] The valve stem 14 is configured to move within the valve body under the action of the working medium pressure, controlling the position of the spool 16. The spool 16 performs the function of the locking element of the safety valve 12, which, upon reaching the opening pressure, moves downwards, releasing excess pressure into the drain through a cavity with an external outlet 22. The cage 15 is a cylinder with holes, inside which the spool 16 moves, which pulls the valve stem 14 behind it, the cage is a guide element for the spool 16, ensuring the precise movement and centering of the parts inside the valve body 13. At the installation location of the cage 15, the valve body 13 has a cavity with an external outlet 22, ensuring the discharge of excess pressure through the holes in the cage 15 into the cavity 22, and then into the external environment.

[0051] Bearer 17 supports spring 18 and other internal valve components, simultaneously protecting them from environmental influences. Bearer 17 is connected to the body. Spring 18 regulates the closing force of spool 16, setting the pressure threshold at which the valve will begin to operate. Spring 18 regulates the valve opening pressure, allowing relief valve 12 to be adjusted to operating parameters.

[0052] Adjusting screw 19 adjusts the preload of spring 18, thereby changing the opening pressure of valve 12. Cover 20 prevents contaminants from entering valve 12 and preventing leakage of the working fluid from the relief valve. It also serves as a travel limiter for piston rod 14.

[0053] The device works as follows

[0054] Valve body 1 and ball plug 2 control the main flow of the working fluid in the valve via handle 11 and valve stem 5. When opened / closed by the operator, handle 11 transmits mechanical movement through stem 5 to ball plug 2, changing its position. Depending on the working fluid flow, in the "open" position of ball plug 2, excessive pressure may be created, which can lead to damage to the valve's main components and leakage of the working fluid.

[0055] To relieve excess pressure, the ball valve comprises a safety valve 12, the body 13 of which is structurally connected to the body 1 of the valve by means of a fastener (studs) and is located with it in the same body. The working cavity of the ball plug 2 in the area of ​​the seals of the ball plug 4 is connected to a channel 21, which leads to a cavity with an external outlet 22. A cage 15 with a spool 16 is installed in the cavity, which is driven by the action of the pressure of the working medium coming from the channel 21. Spring 18 is installed with a preliminary compression, which is adjusted by an adjusting screw 19. It holds the safety valve 12 closed until the pressure of the working medium exceeds the compression force of spring 18. Spring 18, clamped by the adjusting screw 19, holds the valve closed until the pressure exceeds the set threshold.

[0056] When the pressure is exceeded, the spool 16 shifts, opening the channel 21 and the cavity with the external outlet 22 to discharge excess medium, reducing the pressure.

[0057] When the pressure is exceeded, safety valve 12 opens via valve body 13. Its spool 16, driven by valve stem 14, is displaced, allowing excess fluid to escape through channel 21 and the cavity with external outlet 22. Adjusting screw 19 sets the force of spring 18. The valve automatically closes when the pressure returns to normal, and seals 4 and 8 ensure a tight seal. Cage 15 and bowl 17 secure and guide the valve. This maintains optimal pressure and protects the system from overload.

[0058] Thus, the ball valve with a pressure relief valve automates the release of excess pressure, allows for effective control of the flow of the working medium, minimizing damage to the plug, distortions and jamming in the valve structure, thereby increasing the reliability of the ball valve.

Claims

1. A ball valve with a pressure relief safety valve, comprising a housing with a ball plug, configured to control the position of a handle through a stem in a rack, characterized in that it additionally contains a pressure relief valve, wherein the working cavity of the ball plug is connected to a channel in the housing of the safety valve, which, in turn, is connected to a cavity with an external outlet made in the housing of the safety valve for relieving pressure, wherein an adjusting screw, a spring, a valve stem, a spool valve and a cage are installed in the valve housing.

2. A ball valve with a pressure relief valve according to paragraph 1, characterized in that the spool and stem are installed inside a cage, which, in turn, is installed in a cavity with an external outlet.

3. A ball valve with a pressure relief safety valve according to paragraph 1, characterized in that the spool is designed with the possibility of translational movement transmitted by the valve stem.

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