A vent valve

Abstract

This invention discloses a vent valve, characterized in that: the vent valve comprises a stud, nut A, lower valve cover, O-ring A, valve body, spring seat, spring, piston sleeve, O-ring B, valve seat, O-ring seal, valve core, O-ring C, steel ball, set screw, valve core sleeve, valve stem, O-ring D, valve cover, nut B, stud, packing, locking screw, packing gland, bracket, valve stem nut, handwheel, nut C, internal hex bolt, STL valve seat sealing pair, STL valve core sealing pair, valve core balance hole, piston sleeve flushing surface, piston sleeve positioning surface, and valve core throttling cone; this invention provides a vent valve with a hard and soft dual-material sealing pair, belonging to and protected the design and manufacturing method of the sealing pair.

Description

Technical Field

[0001] The present invention relates to the technical field related to valves, and in particular to a vent valve. Background Art

[0002] In the venting and discharge of natural gas as the medium, the valve is required to have throttling, shutoff and venting functions. Since natural gas is a flammable and explosive high-risk medium, this requires that the shutoff function of the valve achieve zero leakage when it is closed. Since the valve is throttling and venting, the valve design is required to have a hidden protection structure for the sealing pair. Summary of the invention

[0003] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a vent valve having a hard and soft dual-material sealing pair, which belongs to and is protected by a sealing pair design and manufacturing method.

[0004] The present invention is implemented in this way, constructing a vent valve, characterized in that: the vent valve comprises a stud, a nut A, a lower valve cover, an O-ring A, a valve body, a spring seat, a spring, a piston sleeve, an O-ring B, a valve seat, an O-ring, a valve core, an O-ring C, a steel ball, a set screw, a valve core sleeve, a valve stem, an O-ring D, a valve cover, a nut B, a stud, a packing, a locking screw, a packing gland, a bracket, a valve stem nut, a handwheel, a nut C, an hexagon socket bolt, an STL valve seat sealing pair, an STL valve core sealing pair, a valve core balancing hole, a piston sleeve flushing surface, a piston sleeve positioning surface, and a valve core throttling cone; the lower valve cover is fixed to the bottom of the valve body by means of a stud and a nut A, and an O-ring A is arranged between the lower valve cover and the valve body; a spring seat, a piston sleeve and a valve seat are arranged in the valve body; the spring seat is fixed by means of an hexagon socket bolt Angle bolts are fixed to the valve seat, an O-ring B is arranged between the valve seat and the valve body, the spring corresponds to the spring seat, the O-ring corresponds to the valve seat, a valve core sleeve is arranged on the valve seat, the valve core is located in the valve core sleeve, and an O-ring C is arranged between the valve core sleeve and the valve core, the valve core is connected to the bottom of the valve stem, a valve core balancing hole is opened in the valve core, an O-ring D is arranged between the valve core sleeve and the valve body, the valve cover is fixed to the valve body by nuts B and studs, packing and packing gland are arranged between the valve cover and the valve stem, the bracket is fixed to the valve cover by locking screws, a valve stem nut is arranged between the bracket and the valve stem, and the handwheel is fixed to the upper part of the valve stem by nut C; the upper end of the piston sleeve is the piston sleeve flushing surface, the upper end of the valve seat is the STL valve seat sealing pair, and the lower end of the valve core has an STL valve core sealing pair and a valve core throttling cone.

[0005] A vent valve according to the present invention is characterized in that when the valve is in a closed position, a hard seal is achieved between the STL valve core sealing pair and the STL valve seat sealing pair; a soft seal is achieved between the O-ring and the valve core, and the valve achieves a hard-soft dual-mass seal to achieve zero leakage.

[0006] According to the vent valve described in the present invention, it is characterized in that: the spring seat, the spring, the piston sleeve, the O-ring B, and the hexagon socket bolt form an integral body to protect the O-ring B; when the valve starts to open from closing, the valve core moves upward, and the piston sleeve also moves upward synchronously with the valve core under the action of the spring. After the valve core is separated from the O-ring B, the piston sleeve contacts the O-ring B to protect the O-ring B. When the valve core completely leaves the piston sleeve flushing surface of the piston sleeve, the piston sleeve positioning surface prevents the piston sleeve from moving upward; when the valve changes from an open state to a closed state, the valve core moves downward, and when the valve core lower end face contacts the piston sleeve flushing surface, the valve core pushes the piston sleeve to move downward, and the valve core and the O-ring B first form a soft sealing pair, and when the valve core moves downward again, the STL valve core sealing pair and the STL valve seat sealing pair realize a hard sealing pair. In the whole process, the soft sealing O-ring B is protected and is not flushed by the medium.

[0007] A vent valve according to the present invention is characterized in that: during the valve opening process, whether it is partially opened or fully opened, the STL valve core sealing pair and the STL valve seat sealing pair are not subject to erosion by the medium, the piston sleeve erosion surface is higher than the STL valve seat sealing pair to protect the STL valve seat sealing pair, and when the valve is fully opened, the STL valve core sealing pair is completely hidden in the valve core sleeve and is not subject to erosion.

[0008] A vent valve according to the present invention is characterized in that: the valve core balance hole plays a balancing role, and the pressures in the upper and lower chambers of the valve core are balanced, so that the valve opening and closing torque is small, and the valve core throttling cone plays a primary throttling and pressure reduction role in the opening and venting process, and the throttling hole of the valve core sleeve plays a secondary throttling role, so that the venting pressure is reduced to protect the downstream venting equipment.

[0009] The present invention has the following advantages: the vent valve of the present invention has a hard and soft dual-material sealing pair, and the protected sealing pair is designed and manufactured; the present invention has the following improvements and advantages;

[0010] First, for this application, the valve structure is designed as a valve core balance cage structure. It mainly consists of a valve body, a valve core, a valve seat, a piston sleeve, a spring, a spring seat 6, a valve core sleeve, a valve stem, a valve cover, etc. When the valve is in the closed position, the STL valve core sealing pair and the STL valve seat sealing pair realize hard sealing; the O-ring and the valve core realize soft sealing, and the valve realizes hard and soft dual-quality sealing to achieve zero leakage.

[0011] Second, the spring seat, spring, piston sleeve 8, O-ring B, and hexagon socket bolt form a whole to protect O-ring B. When the valve starts to open from closed, the valve core moves upward, and the piston sleeve also moves upward synchronously with the valve core under the action of spring 7. After the valve core is separated from the protective O-ring B, the piston sleeve contacts the O-ring B to protect the protective O-ring B. When the valve core completely leaves the piston sleeve flushing surface 33 of the piston sleeve, the piston sleeve positioning surface 34 prevents the piston sleeve from moving upward; when the valve changes from an open state to a closed state, the valve core moves downward, and when it moves to the lower end face of the valve core and contacts the flushing surface of the piston sleeve, the valve core will push the piston sleeve to move downward, and the valve core and the protective O-ring B first form a soft seal pair. When the valve core moves downward again, the STL valve core seal pair and the STL valve seat seal pair realize a hard seal pair. In the whole process, the soft seal protective O-ring B is protected and is not flushed by the medium.

[0012] Third, by Figure 2-Figure 3 It can be seen that during the valve opening process, whether it is partially open or fully open, the STL valve core sealing pair and the STL valve seat sealing pair are not affected by the medium erosion. The piston sleeve erosion surface is higher than the STL valve seat sealing pair to protect the STL valve seat sealing pair. When the valve is fully opened, the STL valve core sealing pair is completely hidden in the valve core sleeve and is not affected by erosion.

[0013] Fourthly, the balance hole of the valve core plays a balancing role, and the pressures in the upper and lower chambers of the valve core are balanced, so that the valve opening and closing torque is small. The throttling cone of the valve core plays a primary throttling and pressure reduction role in the process of opening and venting, and the throttling hole of the valve core sleeve plays a secondary throttling role, which reduces the venting pressure and protects the downstream equipment of the venting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the vent valve of the present invention;

[0015] Figure 2 This is a schematic diagram of the valve fully open state;

[0016] Figure 3 It is a schematic diagram of the valve opening process or half-open state;

[0017] Figure 4-Figure 5 It is a schematic diagram of the structure corresponding to the valve seat;

[0018] Figure 6-Figure 7 It is a schematic diagram of the structure corresponding to the piston sleeve;

[0019] Figure 8-Figure 9 It is a schematic diagram of the structure corresponding to the spring seat.

[0020] Among them: stud 1, nut A2, lower valve cover 3, O-ring A4, valve body 5, spring seat 6, spring 7, piston sleeve 8, O-ring B9, valve seat 10, O-ring 11, valve core 12, O-ring C13, steel ball 14, set screw 15, valve core sleeve 16, valve stem 17, O-ring D18, valve cover 19, nut B20, stud 21, packing 22, locking screw 23, packing gland 24, bracket 25, valve stem nut 26, handwheel 27, nut C28, hexagon socket bolt 29, STL valve seat sealing pair 30, STL valve core sealing pair 31, valve core balancing hole 32, piston sleeve scouring surface 33, piston sleeve positioning surface 34, valve core throttling cone 35. DETAILED DESCRIPTION

[0021] The following will be combined with the attached Figure 1-Figure 9 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a vent valve through improvement. Figure 1-Figure 9As shown, it can be implemented in the following manner; the vent valve comprises a stud 1, a nut A2, a lower valve cover 3, an O-ring A4, a valve body 5, a spring seat 6, a spring 7, a piston sleeve 8, an O-ring B9, a valve seat 10, an O-ring 11, a valve core 12, an O-ring C13, a steel ball 14, a set screw 15, a valve core sleeve 16, a valve stem 17, an O-ring D18, a valve cover 19, a nut B20, a stud 21, a packing 22, a locking screw 23, a packing gland 24, a bracket 25, Stem nut 26, hand wheel 27, nut C28, hexagon socket bolt 29, STL valve seat sealing pair 30, STL valve core sealing pair 31, valve core balance hole 32, piston sleeve flushing surface 33, piston sleeve positioning surface 34, valve core throttling cone 35; lower valve cover 3 is fixed to the bottom of valve body 5 through stud 1 and nut A2, and O-ring A4 is arranged between lower valve cover 3 and valve body 5; spring seat 6, piston sleeve 8 and valve seat 10 are arranged in valve body 5; spring seat 6 is connected to valve seat 10 through hexagon socket bolt 29 The valve seat 10 is fixed, an O-ring B9 is arranged between the valve seat 10 and the valve body 5, the spring 7 corresponds to the spring seat 6, the O-ring 11 corresponds to the valve seat 10, a valve core sleeve 16 is arranged on the valve seat 10, the valve core 12 is located in the valve core sleeve 16, and an O-ring C13 is arranged between the valve core sleeve 16, the valve core 12 is connected to the bottom of the valve stem 17, a valve core balance hole 32 is opened in the valve core 12, an O-ring D18 is arranged between the valve core sleeve 16 and the valve body 5, and the valve cover 19 is connected to the valve stem 17 by the nut B20 and the stud 2 1 is fixed on the valve body 5, a packing 22 and a packing gland 24 are arranged between the valve cover 19 and the valve stem 17, a bracket 25 is fixed on the valve cover 19 by a locking screw 23, a valve stem nut 26 is arranged between the bracket 25 and the valve stem 17, and a hand wheel 27 is fixed to the upper part of the valve stem 17 by a nut C28; the upper end of the piston sleeve 8 is a piston sleeve flushing surface 33, the upper end of the valve seat 10 is an STL valve seat sealing pair 30, and the lower end of the valve core 12 is provided with an STL valve core sealing pair 31 and a valve core throttling cone 35.

[0023] When the vent valve of the present invention is implemented, when the valve is in the closed position, the STL valve core sealing pair 31 and the STL valve seat sealing pair 30 realize hard sealing; the O-ring 11 and the valve core 12 realize soft sealing, and the valve realizes hard and soft dual-quality sealing to achieve zero leakage.

[0024] When the vent valve described in the present invention is implemented; the spring seat 6, the spring 7, the piston sleeve 8, the O-ring B9, and the hexagon socket bolt 29 form a whole to protect the O-ring B9; when the valve starts to open from closing, the valve core 12 moves upward, and the piston sleeve 8 also moves upward synchronously with the valve core 12 under the action of the spring 7. After the valve core 12 is separated from the O-ring B9, the piston sleeve 8 contacts the O-ring B9 to protect the O-ring B9. When the valve core 12 completely leaves the piston sleeve flushing surface 33 of the piston sleeve 8, the piston sleeve positioning surface 34 prevents the piston sleeve from moving upward any further; when the valve changes from an open state to a closed state, the valve core 12 moves downward, and when the lower end surface of the valve core 12 contacts the piston sleeve flushing surface 33, the valve core 12 will push the piston sleeve 8 to move downward, and the valve core 12 and the O-ring B9 first form a soft sealing pair, and when the valve core 12 moves downward again, the STL valve core sealing pair 31 and the STL valve seat sealing pair 30 realize a hard sealing pair. During the whole process, the soft sealing O-ring B9 is protected and not eroded by the medium.

[0025] When the vent valve described in the present invention is implemented; during the valve opening process, whether it is partially opened or fully opened, the STL valve core sealing pair 31 and the STL valve seat sealing pair 30 are not eroded by the medium, and the piston sleeve erosion surface 33 is higher than the STL valve seat sealing pair 30 to protect the STL valve seat sealing pair 30. When the valve is fully opened, the STL valve core sealing pair 31 is completely hidden in the valve core sleeve 16 and is not eroded.

[0026] When the vent valve described in the present invention is implemented, the valve core balance hole 32 plays a balancing role, and the pressures in the upper and lower chambers of the valve core 12 are balanced, so that the valve opening and closing torque is small, and the valve core throttling cone 35 plays a primary throttling and pressure reduction role in the opening and venting process, and the throttling hole of the valve core sleeve 16 plays a secondary throttling role, so that the venting pressure is reduced to protect the downstream venting equipment.

[0027] The vent valve described in the present invention has a hard and soft dual-material sealing pair, and is designed and manufactured with a protected sealing pair; since the medium in the venting and discharge is natural gas, the valve is required to have throttling, cut-off, and venting functions, and since natural gas is a flammable and explosive high-risk medium, this requires that the valve's cut-off function achieve zero leakage when closed, and since the valve is a throttling venting, the valve design is required to have a hidden protective structure for the sealing pair.

[0028] Therefore, for this application, the valve structure is designed as a valve core balance cage structure. It mainly consists of a valve body 5, a valve core 12, a valve seat 10, a piston sleeve 8, a spring 7, a spring seat 6, a valve core sleeve 16, a valve stem 17, a valve cover 19, etc. When the valve is in the closed position, the STL valve core seal pair 31 and the STL valve seat seal pair 30 realize a hard seal; the O-ring 11 and the valve core 12 realize a soft seal, and the valve realizes a hard and soft dual-quality seal to achieve zero leakage.

[0029] The spring seat 6, springs 7, 8, piston sleeve 8, O-ring 9, and hexagon socket bolt 29 form a whole to protect the O-ring 9. When the valve starts to open from closed, the valve core 12 moves upward, and the piston sleeve 8 also moves upward synchronously with the valve core 12 under the action of the spring 7. After the valve core 12 is separated from the protective O-ring 9, the piston sleeve 8 contacts the O-ring B9 to protect the protective O-ring B9. When the valve core 12 completely leaves the piston sleeve flushing surface 33 of the piston sleeve 8, the piston sleeve positioning surface 34 prevents the piston sleeve from moving upward; when the valve changes from an open state to a closed state, the valve core 12 moves downward, and when it moves to the lower end surface of the valve core 12 and contacts the piston sleeve flushing surface 33, the valve core 12 will push the piston sleeve 8 to move downward, and the valve core 12 and the protective O-ring 9 first form a soft sealing pair, and when the valve core 12 moves downward again, the STL valve core sealing pair 31 and the STL valve seat sealing pair 30 realize a hard sealing pair. During the whole process, the soft seal protection O-ring 9 is protected and is not eroded by the medium.

[0030] Depend on Figure 2-Figure 3 It can be seen that during the valve opening process, whether it is partially opened or fully opened, the STL valve core sealing pair 31 and the STL valve seat sealing pair 30 are not eroded by the medium, and the piston sleeve erosion surface 33 is higher than the STL valve seat sealing pair 30 to protect the STL valve seat sealing pair 30. When the valve is fully opened, the STL valve core sealing pair 31 is completely hidden in the valve core sleeve 16 and is not eroded.

[0031] The valve core balance hole 32 plays a balancing role, and the pressures in the upper and lower chambers of the valve core 12 are balanced, so that the valve opening and closing torque is small. The valve core throttling cone 35 plays a primary throttling and pressure reduction role in the opening and venting process, and the throttling hole of the valve core sleeve 16 plays a secondary throttling role, which reduces the venting pressure and protects the downstream venting equipment.

[0032] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vent valve, characterized in that; The vent valve comprises a stud (1), a nut A (2), a lower valve cover (3), an O-ring A (4), a valve body (5), a spring seat (6), a spring (7), a piston sleeve (8), an O-ring B (9), a valve seat (10), an O-ring (11), a valve core (12), an O-ring C (13), a steel ball (14), a set screw (15), a valve core sleeve (16), a valve stem (17), an O-ring D (18), a valve cover (19), a nut B (20), a stud (21), a packing (22), a locking screw (23), a packing gland (24), a bracket (25), and a valve stem nut (26). , hand wheel (27), nut C (28), hexagon socket bolt (29), STL valve seat seal pair (30), STL valve core seal pair (31), valve core balance hole (32), piston sleeve flushing surface (33), piston sleeve positioning surface (34), valve core throttling cone (35); the lower valve cover (3) is fixed to the lower side of the valve body (5) by means of studs (1) and nuts A (2), and an O-ring A (4) is arranged between the lower valve cover (3) and the valve body (5); a spring seat (6), a piston sleeve (8) and a valve seat (10) are arranged in the valve body (5); the spring seat (6) is fixed to the valve seat (10) by means of hexagon socket bolts (29), An O-ring B (9) is arranged between the valve seat (10) and the valve body (5), the spring (7) corresponds to the spring seat (6), the O-ring (11) corresponds to the valve seat (10), a valve core sleeve (16) is arranged on the valve seat (10), the valve core (12) is located in the valve core sleeve (16), and an O-ring C (13) is arranged between the valve core sleeve (16), the valve core (12) is connected to the bottom of the valve stem (17), a valve core balancing hole (32) is opened in the valve core (12), an O-ring D (18) is arranged between the valve core sleeve (16) and the valve body (5), and the valve cover (19) is connected to the valve stem (17) by a nut B (20) and a stud (2 1) is fixed on the valve body (5), a packing (22) and a packing gland (24) are arranged between the valve cover (19) and the valve stem (17), the bracket (25) is fixed on the valve cover (19) by means of a locking screw (23), a valve stem nut (26) is arranged between the bracket (25) and the valve stem (17), and the hand wheel (27) is fixed to the upper part of the valve stem (17) by means of a nut C (28); the upper end of the piston sleeve (8) is a piston sleeve flushing surface (33), the upper end of the valve seat (10) is an STL valve seat sealing pair (30), and the lower end of the valve core (12) is provided with an STL valve core sealing pair (31) and a valve core throttling cone (35).

2. A vent valve according to claim 1, characterized in that; When the valve is in the closed position, the STL valve core sealing pair (31) and the STL valve seat sealing pair (30) realize hard sealing; the O-ring (11) and the valve core (12) realize soft sealing, and the valve realizes hard and soft dual-material sealing to achieve zero leakage.

3. A vent valve according to claim 1, characterized in that; The spring seat (6), spring (7), piston sleeve (8), O-ring B (9), and hexagon socket bolt (29) form a whole to protect the O-ring (9). When the valve starts to open from closed, the valve core (12) moves upward, and the piston sleeve (8) also moves upward synchronously with the valve core (12) under the action of the spring (7). After the valve core (12) and the O-ring B (9) are separated, the piston sleeve (8) contacts the O-ring B (9) to protect the O-ring B (9). When the valve core (12) completely leaves the piston sleeve flushing surface (33) of the piston sleeve (8), the piston sleeve is fixed. The position surface (34) prevents the piston sleeve from moving upward. When the valve changes from an open state to a closed state, the valve core (12) moves downward. When the lower end surface of the valve core (12) contacts the piston sleeve flushing surface (33), the valve core (12) pushes the piston sleeve (8) downward. The valve core (12) and the O-ring (9) first form a soft seal pair. When the valve core (12) moves downward further, the STL valve core seal pair (31) and the STL valve seat seal pair (30) form a hard seal pair. During the entire process, the soft seal O-ring B (9) is protected and is not flushed by the medium.

4. A vent valve according to claim 1, characterized in that; During the valve opening process, whether the valve is partially opened or fully opened, the STL valve core seal pair (31) and the STL valve seat seal pair (30) are not eroded by the medium. The piston sleeve erosion surface (33) is higher than the STL valve seat seal pair (30) to protect the STL valve seat seal pair (30). When the valve is fully opened, the STL valve core seal pair (31) is completely hidden in the valve core sleeve (16) and is not eroded.

5. A vent valve according to claim 1, characterized in that; The valve core balance hole (32) plays a balancing role, and the pressures in the upper and lower chambers of the valve core (12) are balanced, so that the valve opening and closing torque is small. The valve core throttling cone (35) plays a primary throttling and pressure reduction role in the opening and venting process, and the throttling hole of the valve core sleeve (16) plays a secondary throttling role, so that the venting pressure is reduced, thereby protecting the venting downstream equipment.

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