A steel ball valve core type pressure regulating assembly

Abstract

This utility model discloses a steel ball valve core type pressure regulating assembly, including a lower housing, an upper housing, and a valve seat, as well as a high-pressure safety valve assembly, a low-pressure safety valve assembly, an anti-negative pressure safety valve assembly, a high-pressure safety valve spring, and a low-pressure safety valve spring mounted on the valve seat. The lower housing, upper housing, and valve seat are connected by screws. The lower housing has ports C and D as inlets, and the upper housing has ports A and B as outlets. The low-pressure safety valve assembly integrates a steel ball, valve seat 1, ball seat, pilot valve assembly, and pilot valve spring inside its cavity. When the aircraft tilts, it rotates the assembly, causing the steel ball to roll within the ball seat, controlling the opening and closing of the pilot valve assembly, thus regulating the opening pressure of the low-pressure safety valve. The assembly prevents oil leakage during aircraft nose-down, side-tilt, or nose-up flight. It features a compact structure, high integration, small size, and light weight.

Description

Technical Field

[0001] This utility model belongs to the field of aircraft fuel tank pressure control technology, specifically relating to a steel ball valve core type pressure regulating component. Background Technology

[0002] To increase an aircraft's altitude, it is usually necessary to pressurize the fuel tank. When an aircraft is flying nose-down, side-tilt, or nose-up, it is necessary to close the low-pressure safety valve to prevent fuel from overflowing from the low-pressure safety valve. Utility Model Content

[0003] To address the problem of fuel overflowing from the safety valve when an aircraft is flying nose-down, side-tilt, or nose-up, this invention provides a steel ball valve core type pressure regulating assembly.

[0004] This utility model provides a steel ball valve core type pressure regulating assembly, including a lower housing, an upper housing, a valve seat, and a high-pressure safety valve assembly, a low-pressure safety valve assembly, an anti-negative pressure safety valve assembly, and a valve cover installed on the valve seat. The valve seat is located between the lower housing and the upper housing and is fixedly connected by a screw. The valve seat and the upper housing form a cavity one, and the valve seat and the lower housing form a cavity two. The lower housing has an inlet one on one side and an inlet two at the bottom. The upper housing has an outlet one and an outlet two on both sides, respectively. The low-pressure safety valve assembly includes a low-pressure safety valve and its inner cavity integrating a valve seat, a ball seat, a steel ball, a pilot valve assembly, and a pilot valve spring. The steel ball is placed in the ball seat and can roll freely. The ball seat is installed in the valve seat. A guide hole is provided at the center of the bottom of the ball seat. One end of the pilot valve assembly is placed inside the bottom of the valve seat, and the other end can move freely through the guide hole. One end of the pilot valve spring is placed in the pilot valve assembly, and the other end is connected to the valve seat. A low-pressure safety valve spring is sleeved on the outer side. The low-pressure safety valve has a pilot hole at its bottom center, and the valve seat has a pilot hole at its bottom center. One end of the valve cover is positioned above the low-pressure safety valve assembly and connected to the valve seat. The low-pressure safety valve, valve seat, ball seat, steel ball, pilot valve assembly, and pilot valve spring are placed on one side of the cavity. The steel ball rolls within the ball seat, controlling the opening and closing of the pilot valve assembly. The high-pressure safety valve assembly includes a high-pressure safety valve stage and a high-pressure safety valve spring sleeved on its outer side. The spring is located on the other side of the cavity. A through hole is provided at the connection between the valve seat and the high-pressure safety valve assembly, and a through hole is provided at the connection with the low-pressure safety valve assembly. The anti-negative pressure safety valve assembly, bypassing through holes one and two, is connected to the valve seat and placed inside the lower housing. The anti-negative pressure safety valve assembly has two sets, including an anti-vacuum valve and an anti-vacuum spring located outside the anti-vacuum valve. The other end of the valve cover is threaded to the pipe connector. A channel is provided inside the valve cover, communicating with the cavity. When the aircraft tilts, this product rotates, causing the steel ball to roll within the ball seat, controlling the opening and closing of the pilot valve assembly, thus regulating the opening pressure of the low-pressure safety valve.

[0005] The contact angle between the ball seat and the steel ball is 15°, allowing the steel ball to roll freely on the ball seat. When placed vertically, the steel ball presses down the pilot valve assembly, and the gas inside the low-pressure safety valve assembly can be depressurized through pilot hole one and guide hole two. When the product is tilted more than 15°, after the steel ball rolls, the pilot valve assembly fits against the ball seat under the action of the pilot valve spring, closing the guide hole.

[0006] The bottom of the low-pressure safety valve assembly is fixed with a filter screen by screws to prevent impurities from clogging the pilot hole.

[0007] A second filter screen is provided between the valve cover and the pipe joint, and an elastic retaining ring is provided between the second filter screen and the pipe joint. A boss is provided on the outer side of the middle part of the pipe joint to abut against the end of the valve cover, and a sealing ring is provided at the connection between the inner side of the valve cover end and the pipe joint.

[0008] A second sealing ring is provided at the connection between the low-pressure safety valve assembly and the valve seat; a third sealing ring is provided at the connection between the low-pressure safety valve and the upper housing; a fourth sealing ring is provided at the connection between the high-pressure safety valve assembly and the valve seat; and a fifth sealing ring is provided at the contact point between the high-pressure safety valve spring and the upper housing.

[0009] A sealing ring six is ​​installed at the connection between the upper housing and the valve seat, a sealing ring seven is installed at the connection between the valve seat and the valve cover, and a sealing ring eight is installed at the connection between the ball seat and the valve seat.

[0010] Washers are provided at the connection points of the screws connecting the lower housing, the valve seat, and the upper housing.

[0011] The anti-vacuum valve is provided with a sealing ring 10 at the connection between it and the lower housing, the bottom end of the anti-vacuum spring is provided with a sealing ring 11 at the connection between it and the lower housing, and the anti-vacuum valve is provided with a sealing ring 12 at the connection between it and the valve seat.

[0012] The valve cover and valve seat are fixedly connected by countersunk screws.

[0013] When the gas pressure inside the fuel tank rises to the opening pressure of the low-pressure safety valve, the low-pressure safety valve opens to release pressure. When the pressure is too high, reaching the opening pressure of the high-pressure safety valve, the high-pressure safety valve opens to release pressure, ensuring that the pressure inside the fuel tank does not exceed the limit and ensuring the safety of the fuel tank.

[0014] When the aircraft is in flight, the steel ball presses down the pilot valve assembly, opening the pilot hole between the pilot valve assembly and the ball seat. Gas is discharged to the atmosphere through the low-pressure safety valve pilot hole one → valve seat pilot hole two → pilot valve assembly pilot hole three → ball seat guide hole → valve cover channel one. At this time, the pressure inside the low-pressure safety valve is atmospheric pressure, and the opening pressure of the low-pressure safety valve is P1.

[0015] When the aircraft flies in attitudes such as nose-down, side-tilt, or nose-up, the rolling steel ball causes the pilot valve assembly, which was initially pressed down by the steel ball, to spring up and press against the ball seat, closing the guide hole of the ball seat. Gas enters the low-pressure safety valve cavity through the pilot hole, establishing a back pressure P. At this time, the opening pressure P1′ of the low-pressure safety valve must increase the back pressure P, thus preventing the low-pressure safety valve from opening and leaking oil during nose-down, side-tilt, or nose-up flight.

[0016] When the aircraft returns to a normal flight attitude after transitioning from nose-down, side-tilt, or nose-up flight, the rolling steel ball presses down on the pilot valve assembly, opening the guide hole of the ball seat. Gas flows through the low-pressure safety valve pilot hole one → valve seat pilot hole two → pilot valve assembly pilot hole three → ball seat guide hole → valve cover passage one to the atmosphere. At this point, the pressure inside the low-pressure safety valve is atmospheric pressure, and when the low-pressure safety valve opens, the pressure returns to P1.

[0017] The beneficial effects of this utility model are:

[0018] This utility model uses a steel ball valve core type pressure regulating component to control the fuel tank pressure, ensuring that the residual pressure of the aircraft fuel tank is within a reasonable range throughout the entire flight profile, and preventing fuel leakage when the aircraft is flying in attitudes such as nose-down, side-tilt, or nose-up. The product has a compact structure, high integration, small size, and light weight. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0020] Figure 1 A schematic diagram of the steel ball valve core type pressure regulating assembly provided by this utility model;

[0021] Figure 2 A perspective view of the steel ball valve core type pressure regulating assembly provided by this utility model;

[0022] Figure 3 for Figure 2 Sectional view along direction II-II;

[0023] Figure 4 for Figure 2 Partial view of section II;

[0024] Figure 5 for Figure 2 A magnified view of the G direction;

[0025] Figure 6 This is a state diagram of the steel ball valve core type pressure regulating assembly during aircraft flight.

[0026] Figure 7 A diagram showing the status of a steel ball valve core type pressure regulating assembly when an aircraft is flying with its nose down.

[0027] In the attached diagram: 1-lower shell, 1001-cavity II,

[0028] 2-Gate seat, 2001-Washer, 2002-Through hole one, 2003-Through hole two

[0029] 3-Upper shell, 3001-Cavity 1

[0030] 4-Valve cover, 4001-Channel 1

[0031] 5-Screw 1

[0032] 6-High-pressure safety valve assembly, 6001-High-pressure safety valve, 6002-High-pressure safety valve spring, 6003-Sealing ring five, 6004-Sealing ring four

[0033] 7-Low-pressure safety valve assembly, 7001-Low-pressure safety valve, 7001.1-Pilot hole one, 7002-Valve seat, 7002.1-Pilot hole two, 7003-Ball seat, 7003-Pilot guide hole, 7004-Steel ball, 7005-Pilot valve assembly, 7005-Pilot pilot hole three, 7006-Pilot valve spring, 7007-Low-pressure safety valve spring, 7008-Filter screen one, 7009-Screw one, 7010-Sealing ring two, 701-Pilot sealing ring three, 7012-Sealing ring six, 7013-Sealing ring seven, 7014-Sealing ring eight, 7015-Sealing ring nine

[0034] 8-Anti-negative pressure safety valve assembly, 8001-Anti-vacuum valve, 8002-Anti-vacuum spring, 8003-Sealing ring ten, 8004-Sealing ring eleven, 8005-Sealing ring twelve

[0035] 9-Pipe fitting, 9001-Sealing ring one, 9002-Elastic retaining ring, 9003-Filter screen two

[0036] 10 - Countersunk screw. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0038] Please refer to Figure 5, which shows a schematic diagram of the steel ball valve core type pressure regulating assembly provided by this utility model. It includes a lower housing 1, an upper housing 3, and a valve seat 2, as well as a high-pressure safety valve assembly 6, a low-pressure safety valve assembly 7, an anti-negative pressure safety valve assembly 8, and a valve cover 4 installed on the valve seat 2. The valve seat 2 is located between the lower housing 1 and the upper housing 3 and is fixedly connected by screw 5. The valve seat 2 and the upper housing 3 form a cavity 3001, and the valve seat 2 and the lower housing 1 form a cavity 1001. The lower housing 1 has an inlet C on one side and an inlet D at the bottom. The upper housing 3 has an outlet A and an outlet B on both sides respectively. The low-pressure safety valve assembly 7 includes a low-pressure safety valve assembly 6, a low-pressure safety valve assembly 7, an anti-negative pressure safety valve assembly 8, and a valve cover 4. The low-pressure safety valve 7001 and its inner cavity integrate a valve seat 7002, a ball seat 7003, a steel ball 7004, a pilot valve assembly 7005, and a pilot valve spring 7006. The steel ball 7004 is placed inside the ball seat 7003 and can roll freely. The ball seat 7003 is installed inside the valve seat 7002. A guide hole 7003.1 is provided at the center of the bottom of the ball seat 7003. One end of the pilot valve assembly 7005 is placed inside the bottom of the valve seat 7002, and the other end can pass through the guide hole 7003.1. One end of the pilot valve spring 7006 is placed inside the pilot valve assembly 7005, and the other end is connected to the valve seat 7002. A low-pressure safety valve is sleeved on the outside of the low-pressure safety valve 7001. The valve spring 7007, the low-pressure safety valve 7001 has a pilot hole 7001.1 at the bottom center, the valve seat 7002 has a pilot hole 7002.1 at the bottom center, one end of the valve cover 4 is placed above the low-pressure safety valve assembly 7 and connected to the valve seat 7002, and the low-pressure safety valve 7001, valve seat 7002, ball seat 7003, steel ball 7004, pilot valve assembly 7005 and pilot valve spring 7006 are placed on one side of the cavity 3001. The steel ball 7004 rolls in the ball seat 7003, controlling the pilot valve assembly 7005 to open and close the guide hole 7003.1. The high-pressure safety valve assembly 6 includes a high-pressure safety valve. The high-pressure safety valve spring 6002, which is sleeved on its outer side, is located on the other side of the cavity 3001. A through hole 2002 is provided at the connection between the valve seat 2 and the high-pressure safety valve assembly 6, and a through hole 2003 is provided at the connection with the low-pressure safety valve assembly 7. The anti-negative pressure safety valve assembly 8, bypassing the through holes 2002 and 2003, is connected to the valve seat 2 and placed inside the lower housing 1. Two sets of anti-negative pressure safety valve assemblies 8 are provided at the front and rear, including an anti-vacuum valve 8001 and an anti-vacuum spring 8002 located on its outer side. The other end of the valve cover 4 is threadedly connected to the pipe connector 9. A channel 4001 is provided inside the valve cover 4, communicating with the cavity 3001. The valve cover 4 and the valve seat 7002 are fixedly connected by countersunk screws 10.

[0039] The contact angle between the ball seat 7003 and the steel ball 7004 is 15°. The steel ball 7004 can roll freely on the ball seat 7003. When placed vertically, the steel ball 7004 presses down the pilot valve assembly 7005. Gas inside the low-pressure safety valve assembly 7 can be depressurized through pilot hole 1 7001.1 and guide hole 2 7002.1. When the product is tilted more than 15°, after the steel ball 7004 rolls, the pilot valve assembly 7005, under the action of the pilot valve spring 7006, comes into contact with the ball seat 7003, closing the guide hole 7003.1.

[0040] The bottom of the low-pressure safety valve assembly 7 is fixedly mounted with a filter screen 7008 by screw 7009. A filter screen 9003 is provided between the valve cover 4 and the pipe connector 9. An elastic retaining ring 9002 is provided between the filter screen 9003 and the pipe connector 9. A boss is provided on the outer side of the middle part of the pipe connector 9 to abut the end of the valve cover 4. A sealing ring 9001 is provided at the connection between the inner side of the end of the valve cover 4 and the pipe connector 9.

[0041] A sealing ring 7010 is provided at the connection between the low-pressure safety valve assembly 7 and the valve seat 2; a sealing ring 7011 is provided at the connection between the low-pressure safety valve 7001 and the upper housing 3; a sealing ring 6004 is provided at the connection between the high-pressure safety valve assembly 6 and the valve seat 2; and a sealing ring 6003 is provided at the contact point between the high-pressure safety valve spring 6002 and the upper housing 3. A washer 2001 is provided at the connection point between the screw 5 and the lower housing 1, the valve seat 2, and the upper housing 3. A sealing ring 8003 is provided at the connection between the anti-vacuum valve 8001 and the lower housing 1; a sealing ring 8004 is provided at the connection between the bottom end of the anti-vacuum spring 8002 and the lower housing 1; and a sealing ring 8005 is provided at the connection between the anti-vacuum valve 8001 and the valve seat 2.

[0042] When the gas pressure inside the fuel tank rises to the opening pressure of the low-pressure safety valve 7001, the low-pressure safety valve 7001 opens to release pressure. When the pressure is too high, reaching the opening pressure of the high-pressure safety valve 6001, the high-pressure safety valve 6001 opens to release pressure, ensuring that the pressure inside the fuel tank does not exceed the limit and ensuring the safety of the fuel tank.

[0043] The steel ball 7004 is placed inside the low-pressure safety valve assembly 7, making full use of the internal structural space of the product. In order to prevent fuel from overflowing from the low-pressure safety valve when the aircraft is flying in attitudes such as nose-down, side-tilt, or nose-up, it is necessary to increase the opening pressure of the low-pressure safety valve. The low-pressure safety valve will not open and leak oil during attitude flight.

[0044] like Figure 6As shown, when the aircraft is in flight, the steel ball 7004 presses down the pilot valve assembly 7005, and the guide hole 7003.1 of the ball seat 7003 opens. Gas is discharged to the atmosphere through the low-pressure safety valve pilot hole 1 7001.1 → valve seat pilot hole 2 7002.1 → pilot valve assembly pilot hole 3 7005.1 → ball seat guide hole 7003.1 → valve cover channel 1 4001. At this time, the pressure inside the low-pressure safety valve is atmospheric pressure, and the opening pressure of the low-pressure safety valve is P1.

[0045] like Figure 7 As shown, when the aircraft is flying in attitudes such as nose-down, side-tilt, or nose-up, after the steel ball 7004 rolls, the pilot valve assembly 7005, which was originally pressed down by the steel ball 7004, is lifted up by the pilot valve spring 7006 and pressed against the ball seat 7003. The pilot valve assembly 7005 closes the guide hole 7003.1 of the ball seat 7003. Gas enters the inner cavity of the low-pressure safety valve assembly through the low-pressure safety valve pilot hole 7001.1, and a back pressure P is established in the inner cavity of the low-pressure safety valve assembly. At this time, the opening pressure P1′ of the low-pressure safety valve needs to be increased to increase the back pressure P. Compared with P1, the back pressure increases, which can achieve the purpose of preventing the low-pressure safety valve from opening and leaking oil when the aircraft is flying in attitudes such as nose-down, side-tilt, or nose-up.

[0046] When the aircraft returns to a normal flight attitude after transitioning from nose-down, side-tilt, or nose-up flight, the pilot valve assembly 7005, pressed down by the rolling steel ball 7004, opens the guide hole 7003.1 of the ball seat 7003. Gas is discharged to the atmosphere through the low-pressure safety valve pilot hole 1 7001.1 → valve seat pilot hole 2 7002.1 → pilot valve assembly pilot hole 3 7005.1 → ball seat guide hole 7003.1 → valve cover passage 1 4001. At this time, the pressure inside the low-pressure safety valve is atmospheric pressure, and the opening pressure of the low-pressure safety valve returns to P1.

[0047] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, are all covered within the scope of the claims of this utility model.

Claims

1. A steel ball valve core type pressure regulating assembly, characterized in that: The system includes a lower housing (1), an upper housing (3), and a valve seat (2), as well as a high-pressure safety valve assembly (6), a low-pressure safety valve assembly (7), a negative pressure safety valve assembly (8), and a valve cover (4) mounted on the valve seat (2). The valve seat (2) is located between the lower housing (1) and the upper housing (3) and is fixedly connected by a screw (5). The valve seat (2) and the upper housing (3) form a cavity (3001), and the valve seat (2) and the lower housing (1) form a cavity (1001). The lower housing (1) has an inlet (C) on one side and an inlet (D) at the bottom. The upper housing (3) has an outlet (A) and an outlet (B) on both sides. The low-pressure safety valve assembly (7) includes a low-pressure safety valve (7001) and its inner cavity integrates a valve seat (7002), a ball seat (7003), and a steel ball (7004). The valve assembly includes a pilot valve assembly (7005) and a pilot valve spring (7006). A steel ball (7004) is placed inside a ball seat (7003) and can roll freely. The ball seat (7003) is installed inside a valve seat (7002). A guide hole (7003.1) is provided at the center of the bottom of the ball seat (7003). One end of the pilot valve assembly (7005) is placed inside the bottom of the valve seat (7002), and the other end can pass through the guide hole. (7003.1) One end of the pilot valve spring (7006) is placed inside the pilot valve assembly (7005), and the other end is connected to the valve seat (7002). A low-pressure safety valve spring (7007) is sleeved on the outside of the low-pressure safety valve (7001). A pilot hole one (7001.1) is provided at the bottom center of the low-pressure safety valve (7001), and a pilot hole two (7002) is provided at the bottom center of the valve seat (7002).1) One end of the valve cover (4) is placed above the low-pressure safety valve assembly (7) and connected to the valve seat (7002). The low-pressure safety valve (7001), valve seat (7002), ball seat (7003), steel ball (7004), pilot valve assembly (7005), and pilot valve spring (7006) are placed on one side of the cavity (3001). The steel ball (7004) rolls in the ball seat (7003) to control the opening and closing of the pilot valve assembly (7005). The high-pressure safety valve assembly (6) includes a high-pressure safety valve (6001) and a high-pressure safety valve spring (6002) sleeved on its outer side, which are placed on the other side of the cavity (3001). The valve seat (2) has a through hole (2002) at its connection with the high-pressure safety valve assembly (6), and a through hole (2003) at its connection with the low-pressure safety valve assembly (7). The anti-negative pressure safety valve assembly (8) is connected to the valve seat (2) and placed inside the lower housing (1), avoiding the through holes (2002) and (2003). The anti-negative pressure safety valve assembly (8) has two sets, including an anti-vacuum valve (8001) and an anti-vacuum spring (8002) on its outer side. The other end of the valve cover (4) is threadedly connected to the pipe connector (9). The valve cover (4) has a channel (4001) communicating with the cavity (3001).

2. The steel ball valve core type pressure regulating assembly according to claim 1, characterized in that: The contact angle between the ball seat (7003) and the steel ball (7004) is 15°. The steel ball (7004) can roll freely on the ball seat (7003). When placed vertically, the steel ball (7004) presses down the pilot valve assembly (7005). The gas in the cavity of the low-pressure safety valve assembly (7) can be depressurized through the pilot hole one (7001.1) and the guide hole two (7002.1). When the product is tilted more than 15°, after the steel ball (7004) rolls, the pilot valve assembly (7005) is in contact with the ball seat (7003) under the action of the pilot valve spring (7006) and closes the guide hole (7003.1).

3. The steel ball valve core type pressure regulating assembly according to claim 1, characterized in that: The bottom of the low-pressure safety valve assembly (7) is fixedly fitted with a filter screen (7008) by a screw (7009).

4. The ball valve core type pressure regulating assembly according to claim 1, characterized in that: A second filter screen (9003) is provided between the valve cover (4) and the pipe joint (9), and an elastic retaining ring (9002) is provided between the second filter screen (9003) and the pipe joint (9). A boss is provided on the outer side of the middle part of the pipe joint (9) to abut against the end of the valve cover (4), and a sealing ring (9001) is provided at the connection between the inner side of the end of the valve cover (4) and the pipe joint (9).

5. The steel ball valve core type pressure regulating assembly according to claim 1, characterized in that: The low-pressure safety valve assembly (7) is provided with a sealing ring two (7010) at the connection between it and the valve seat (2), the low-pressure safety valve (7001) is provided with a sealing ring three (7011) at the connection between it and the upper housing (3), the high-pressure safety valve assembly (6) is provided with a sealing ring four (6004) at the connection between it and the valve seat (2), and the high-pressure safety valve spring (6002) is provided with a sealing ring five (6003) at the contact point between it and the upper housing (3).

6. The ball valve core type pressure regulating assembly according to claim 1, characterized in that: A sealing ring six (7012) is installed at the connection between the upper housing (3) and the valve seat (7002), a sealing ring seven (7013) is installed at the connection between the valve seat (7002) and the valve cover (4), a sealing ring eight (7014) is installed at the connection between the ball seat (7003) and the valve seat (7002), and a sealing ring nine (7015) is provided at the connection between the valve cover (4) and the valve seat (7002).

7. The ball valve core type pressure regulating assembly according to claim 1, characterized in that: A washer (2001) is provided at the connection point of the screw (5) connecting the lower housing (1), the valve seat (2) and the upper housing (3).

8. The ball valve core type pressure regulating assembly according to claim 1, characterized in that: A sealing ring ten (8003) is provided at the connection between the anti-vacuum valve (8001) and the lower housing (1), a sealing ring eleven (8004) is provided at the connection between the bottom end of the anti-vacuum spring (8002) and the lower housing (1), and a sealing ring twelfth (8005) is provided at the connection between the anti-vacuum valve (8001) and the valve seat (2).

9. The ball valve core type pressure regulating assembly according to claim 1, characterized in that: The valve cover (4) and the valve seat (7002) are fixedly connected by countersunk screws (10).

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