Soft and hard dual-seal throttling stop emptying valve

Abstract

The utility model discloses a soft and hard dual-sealing throttling stop emptying valve, relates to the field of stop valves, and solves the problems of insufficient sealing performance and the like. The bottom of the valve clack is integrally connected with an annular hard sealing clack, the hard sealing clack is sleeved with a soft sealing ring, and the valve seat is provided with a hard sealing layer and a soft sealing ring embedded in the top face of the valve seat. The soft sealing ring is exposed outwards on the top face of the valve seat and makes contact with the soft sealing ring to form soft sealing fit, and the hard sealing layer makes contact with the hard sealing petal to form hard sealing fit. Soft and hard dual sealing is achieved, soft sealing fit can effectively make up for tiny unevenness of a sealing face and contain tiny particles by means of elasticity and filling performance of the soft sealing ring and the soft sealing ring, and a good initial sealing effect is provided. The hard sealing petals and the hard seals can bear scouring of high-pressure and high-speed media, and the final sealing reliability and long-term durability under severe working conditions are ensured; and the two are mutually complemented under the synergistic effect, so that the adaptability and the stability of the valve under different working conditions are enhanced.

Description

Technical Field

[0001] The utility model relates to the field of globe valves, in particular to a throttle stop and vent valve with double hard and soft seals. Background Art

[0002] In key processes of industrial fields such as petroleum, chemical industry, natural gas, and long-distance pipelines, the throttle stop and vent valve plays a crucial role. It integrates functions of throttle regulation, reliable shut-off, and emergency venting, and is the core opening and closing equipment to ensure the safe and efficient operation of the pipeline system. Its performance is directly related to production safety, energy efficiency, and environmental protection. This type of valve needs to work stably for a long time under harsh working conditions of high pressure, large pressure difference, strong corrosion, and containing impurities (such as sand particles, catalyst powder, hydrates, scale deposits, etc.), posing extremely high requirements for sealing performance and anti-blocking ability.

[0003] For a long time, traditional throttle stop and vent valves generally adopt a single sealing structure, mainly relying on the hard seal form of metal-to-metal. The sealing surfaces of the valve seat and valve disc are usually surfacing welded with hard alloys (such as Stellite alloy) to improve their hardness, wear resistance, and high-temperature resistance. This hard seal design does show good durability in high-temperature, high-pressure, and clean medium environments. However, when facing some media containing tiny particle impurities, the hard sealing surface is extremely easy to be scoured, scratched, or embedded with particles. Each opening and closing operation may exacerbate this wear, resulting in grooves, indentations, or local defects on the sealing surface, thus affecting the sealing effect. Moreover, when the valve is quickly closed or the system pressure fluctuates violently, there is a lack of sufficient elastic buffer between the hard sealing surfaces, which may cause the sealing surfaces to impact and collide instantaneously, increasing the risk of damage.

[0004] In addition, during the throttling or venting process, especially when dealing with viscous, easy-to-crystallize, or high-solid-content media, the impurities and solid particles in the media are extremely easy to deposit and caking at the top of the valve disc, around the valve stem, and in the valve sleeve gap, having an adverse effect on the opening and closing of the valve disc. Summary of the Utility Model

[0005] The purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a throttle stop and vent valve with double hard and soft seals, solving problems such as insufficient sealing performance and the influence of deposits on opening and closing.

[0006] Technical solution of the utility model: It includes a valve body, a valve seat fixedly connected to the valve body, a valve sleeve located above the valve seat and fixedly installed in the valve body, a valve flap located in the valve sleeve and capable of moving up and down relative to the valve sleeve, a valve stem for driving the valve flap to move, and a fixing sleeve connecting the valve stem and the valve flap. A ring-shaped hard sealing flap is integrally connected to the bottom of the valve flap, and a soft sealing ring is sleeved outside the hard sealing flap. A hard sealing layer and a soft sealing ring embedded in the top surface of the valve seat are provided on the valve seat; the soft sealing ring is exposed outward on the top surface of the valve seat and contacts the soft sealing ring to form a soft sealing fit, and the hard sealing layer contacts the hard sealing flap to form a hard sealing fit.

[0007] With the above technical solution, the soft and hard double-sealing structure is combined to achieve double soft and hard seals; relying on the elasticity and filling properties of the soft sealing ring and the soft sealing gasket, the soft sealing fit can effectively compensate for the minute unevenness of the sealing surface such as scratches and indentations and accommodate minute particles, providing a good initial sealing effect, reducing the risk of micro-leakage under the condition of particle-containing media, and can provide buffering during rapid closing or pressure fluctuation of the valve, reducing impact damage; the hard sealing flap and the hard seal can withstand the erosion of high-pressure and high-speed media, ensuring the final sealing reliability and long-term durability under harsh working conditions; the two work together and complement each other, comprehensively improving the sealing grade and service life of the valve, and enhancing the adaptability and stability of the valve under different working conditions.

[0008] In a possible design, a downwardly concave installation groove is provided on the top surface of the valve seat, and the soft sealing ring is placed in the installation groove; the cross-section of the soft sealing ring is in a water droplet shape, and the notch of the installation groove is in a converging shape to fit the shape of the soft sealing ring.

[0009] With the above design, the soft sealing ring with a water droplet-shaped cross-section matches the converging installation groove, which can provide a more uniform pressure distribution, further enhancing the sealing effect and reducing the possibility of leakage; the shape of the installation groove provides a stable installation position for the soft sealing ring, preventing it from shifting or falling off during the use of the valve; the water droplet-shaped soft sealing ring fits the converging notch, which can better adapt to the pressure change during the closing of the valve, enabling the soft sealing ring to expand evenly around when pressed, enhancing the sealing effect with the soft sealing ring, and further improving the reliability of the soft seal.

[0010] In a possible design, a flange is convexly provided on the outer peripheral wall of the hard sealing flap, and a positioning groove is provided on the inner peripheral wall of the soft sealing ring to fit the flange.

[0011] With the above design, the cooperation of the flange and the positioning groove provides reliable axial and circumferential positioning for the soft sealing ring, preventing it from sliding or twisting excessively during opening and closing, increasing the sealing stability, simplifying the assembly process at the same time, and improving the production efficiency.

[0012] In a possible design, a flow hole is provided in the fixed sleeve, and a guide member is installed at the edge of the top orifice of the flow hole. The guide member is fixedly connected to the fixed sleeve; the guide member has an inclined surface located above the top orifice of the flow hole to guide the flow to radially rush outwards.

[0013] With the above design, the inclined surface design on the guide member can guide the medium to radially impact outwards at a certain angle, impacting the sediment accumulated on the top surface of the valve flap, which can loosen and lift the sediment originally attached to the top surface of the valve flap, making it easier for these sediments to be carried away by the fluid through the flow hole instead of continuing to accumulate on the top of the valve flap, reducing the influence of sediment on the opening and closing of the valve flap, optimizing the maintenance cycle of the valve, and extending its service life. Description of the Drawings

[0014] Figure 1 It is a cross-sectional view of a specific embodiment of the present utility model;

[0015] Figure 2 For the present utility model Figure 1 The partial enlarged view at position A;

[0016] Figure 3 For the present utility model Figure 2 The partial enlarged view at position B;

[0017] Figure 4 For the present utility model Figure 2 The partial enlarged view at position C;

[0018] Wherein, 1, valve body; 2, valve seat; 21, hard seal layer; 22, soft sealing ring; 23, installation groove; 3, valve sleeve; 4, valve flap; 41, hard seal flap; 42, soft seal ring; 43, flange; 5, valve stem; 6, fixed sleeve; 61, flow hole; 62, guide member. Detailed Embodiment

[0019] Such as Figures 1-3A throttle stop and vent valve with both hard and soft seals is shown, which includes a valve body 1, a valve seat 2 fixedly connected inside the valve body 1, a valve sleeve 3 located above the valve seat 2 and fixedly installed inside the valve body 1, a valve flap 4 located inside the valve sleeve 3 and capable of moving up and down relative to the valve sleeve 3, a valve stem 5 driving the movement of the valve flap 4, and a fixing sleeve 6 connecting the valve stem 5 and the valve flap 4. A circular hard seal flap 41 is integrally connected to the bottom of the valve flap 4. The hard seal flap 41 protrudes relatively at the bottom of the valve flap 4. A soft seal ring 42 is sleeved outside the hard seal flap 41. A hard seal layer 21 is provided on the valve seat 2, and a soft sealing ring 22 is embedded in the top surface of the valve seat 2; the soft sealing ring 22 is exposed outward on the top surface of the valve seat 2 and contacts the soft seal ring 42 to form a soft seal fit. The hard seal layer 21 is located on the top surface of the valve seat 2 and contacts the hard seal flap 41 to form a hard seal fit. Among them, the bottom of the hard seal flap 41 and the hard seal layer 21 are made of hard surfacing alloy, and the soft sealing ring 22 and the soft seal ring 42 are made of one of rubber, silica gel or plastic. The plastic can be polytetrafluoroethylene. This hard and soft double-seal structure combines the good filling property of soft materials and the high strength and wear resistance of hard materials, can effectively improve the sealing performance of the valve, and meet the sealing requirements under different working conditions.

[0020] An installation groove 23 is recessed downward on the top surface of the valve seat 2, and the soft sealing ring 22 is placed in the installation groove 23; the cross-section of the soft sealing ring 22 is in the shape of a water droplet, that is, the upper tip is small and gradually widens downward, and the notch of the installation groove 23 is in a converging shape, that is, the two side walls of the notch gradually approach each other but still have a gap, so that the shape of the groove wall of the installation groove 23 can fit the shape of the soft sealing ring 22. When installing the soft sealing ring 22, due to the soft property of the soft sealing ring 22, it can be inserted into the notch of the installation groove 23; due to the converging design of the notch, the soft sealing ring 22 can be better fixed, so that it is not easy to shift during the operation of the valve. When closing the valve flap 4, the soft seal ring 42 and the tip of the soft sealing ring 22 are elastically squeezed against each other, so that the soft sealing ring 22 can expand evenly around and fill the installation groove 23 under pressure, and the gap is compressed and reduced, thereby enhancing the sealing effect of the soft seal.

[0021] A flange 43 is convexly provided on the outer peripheral wall of the hard seal flap 41, and a positioning groove is provided on the inner peripheral wall of the soft seal ring 42 to fit the flange 43. When installing the soft seal ring 42, align the positioning groove with the flange 43 on the hard seal flap 41, so that the soft seal ring 42 is accurately sleeved on the hard seal flap 41. The cooperation between the flange 43 and the positioning groove can effectively prevent the soft seal ring 42 from sliding relative to the hard seal flap 41 during use, avoid the soft seal ring 42 from detaching from the valve flap 4, and ensure the stability and reliability of the soft seal.

[0022] As Figure 4As shown in the figure, a flow hole 61 is provided in the fixed sleeve 6, and a guide member 62 is installed at the edge of the top hole of the flow hole 61. The guide member 62 is fixedly connected to the fixed sleeve 6. The guide member 62 can be fixed to the fixed sleeve 6 by means such as welding or threaded connection to ensure its firm installation. The guide member 62 has an inclined surface located above the top hole of the flow hole 61. When the medium flows out of the flow hole 61, the inclined surface will guide the medium to rush out radially outward. Impact the sediment accumulated on the top surface of the valve flap 4, causing the sediment to rise and be output through the flow hole 61 under certain valve states, reducing the influence of sediment accumulation on the valve performance.

[0023] The general working principle of the valve in this application is as follows: When the valve needs to be closed, by operating the valve stem 5, the valve stem 5 drives the valve flap 4 to move downward along the valve sleeve 3. As the valve flap 4 descends, the soft seal ring 42 first contacts the soft seal ring 22 on the valve seat 2 to form a soft seal, initially preventing the medium from flowing. The valve flap 4 continues to descend, and the hard seal flap 41 contacts the hard seal layer 21 on the valve seat 2 to form a hard seal, further enhancing the sealing effect to ensure that the valve is completely closed and prevent the medium from leaking. When the valve needs to be opened, the valve stem 5 is operated in the reverse direction, the valve stem 5 drives the valve flap 4 to move upward along the valve sleeve 3, the soft seal ring 42 is separated from the soft seal ring 22, and the hard seal flap 41 is separated from the hard seal layer 21, and the medium begins to flow in the valve. At this time, the medium passes through the flow hole 61 in the fixed sleeve 6 and flows radially outward under the guidance of the inclined surface of the guide member 62, realizing the functions of smooth throttling and venting.

Claims

1. A throttling stop and vent valve with a double seal of soft and hard types, comprising a valve body (1), a valve seat (2) fixedly connected to the valve body (1), a valve sleeve (3) located above the valve seat (2) and fixedly installed in the valve body (1), a valve flap (4) located in the valve sleeve (3) and capable of moving up and down relative to the valve sleeve (3), a valve stem (5) driving the valve flap (4) to move, and a fixing sleeve (6) connecting the valve stem (5) and the valve flap (4), characterized in that: A ring-shaped hard seal flap (41) is integrally connected to the bottom of the valve flap (4). A soft seal ring (42) is sleeved outside the hard seal flap (41). A hard seal layer (21) and a soft seal ring (22) embedded in the top surface of the valve seat (2) are provided on the valve seat (2). The soft seal ring (22) is exposed outward on the top surface of the valve seat (2) and contacts the soft seal ring (42) to form a soft seal fit. The hard seal layer (21) contacts the hard seal flap (41) to form a hard seal fit.

2. The throttling stop and vent valve with double soft and hard seals according to claim 1, characterized in that: An installation groove (23) recessed downward is formed in the top surface of the valve seat (2). The soft seal ring (22) is placed in the installation groove (23). The cross-section of the soft seal ring (22) is in a water droplet shape. The notch of the installation groove (23) is in a converging shape to fit the shape of the soft seal ring (22).

3. The throttling shut-off and vent valve with both soft and hard seals according to claim 1 or 2, characterized in that: A flange (43) is convexly provided on the outer peripheral wall of the hard seal flap (41). A positioning groove that fits the flange (43) is formed in the inner peripheral wall of the soft seal ring (42).

4. The throttling shut-off and vent valve with double hard and soft seals according to claim 1 or 2, characterized in that: A flow-through hole (61) is formed in the fixed sleeve (6). A guide member (62) is installed at the edge of the top hole of the flow-through hole (61). The guide member (62) is fixedly connected to the fixed sleeve (6). The guide member (62) has an inclined surface, and the inclined surface is located above the top hole of the flow-through hole (61) to guide the flow to radially rush outwards.

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