A threaded plug-in stop valve

Abstract

A threaded plug-in stop valve comprises a valve body, a valve head, a sleeve, a valve core, and a rotatable valve stem. The inner wall of the upper end of the valve body matches the outer wall of the lower end of the valve head arranged outside the valve block. The lower end of the valve body is inserted into the valve block. The lower end of the valve body is evenly provided with a plurality of A ports around its circumference. The A ports and the lower end opening of the valve body are both connected to the hydraulic oil circuit arranged outside the valve block. An inclined surface is arranged on the inner wall of the lower end opening. The upper end outer wall of the sleeve is threadedly connected to the inner wall of the lower end of the valve head. The lower end outer wall of the sleeve is threadedly connected to the inner wall of the lower end of the valve body. The upper end outer wall of the valve core matches the inner wall of the lower end of the sleeve. An inverted cone-shaped table surface matching the inclined surface seal is arranged on the outer wall of the lower end of the valve core. The rotatable valve stem is axially fixed on the valve head. The lower end outer wall of the valve stem is threadedly connected to the inner wall of the upper end of the valve core. The upper end of the valve stem passes through the valve head and extends to the outside of the valve head. The design is simple in structure, compact, and occupies a small space. It is suitable for hydraulic systems with small installation space.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a threaded plug-in stop valve, which is suitable for greatly reducing the space occupied by the stop valve and can be installed on a hydraulic system with a small space. Background Art

[0002] During the use and maintenance of hydraulic systems, stop valves are often required. Stop valves are mainly used to cut off or communicate the hydraulic system oil circuit, which is convenient for the use and maintenance of hydraulic systems. However, traditional high-pressure stop valves are mainly plate-mounted, flange-mounted, and pipe-mounted, which occupy a large space and have low integration. In systems with relatively small spaces, the application of such stop valves is limited. Therefore, there is an urgent need for a stop valve with a simple and compact structure that is suitable for use in hydraulic systems with small installation spaces. Summary of the invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a threaded plug-in stop valve which has a simple and compact structure and is suitable for use in hydraulic systems with a small installation space.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A threaded plug-in stop valve, the stop valve comprises a valve body, a valve head, a sleeve, a valve core, and a rotatable valve stem. The valve body is a cylindrical structure with upper and lower openings. The upper inner wall of the valve body matches the lower outer wall of the valve head arranged outside the valve block. The lower end of the valve body is inserted into the valve block. The lower end of the valve body is evenly provided with a plurality of A ports around its circumference. The A ports and the lower end opening of the valve body are both connected to a hydraulic oil circuit arranged outside the valve block. An inclined surface is provided on the inner wall of the lower end opening. The upper outer wall is threadedly connected to the lower inner wall of the valve head, and the lower outer wall of the sleeve is threadedly connected to the lower inner wall of the valve body. The valve core is a barrel-shaped structure with an open upper end. The upper outer wall of the valve core cooperates with the lower inner wall of the sleeve. The lower outer wall of the valve core is provided with an inverted cone table that cooperates with the inclined surface seal. The lower outer wall of the rotatable valve stem is threadedly connected to the upper inner wall of the valve core. The middle part of the rotatable valve stem is axially fixed on the valve head, and the upper end of the rotatable valve stem passes through the middle part of the valve head and extends to the outside of the valve head.

[0006] A plurality of oil leakage holes are provided on the valve core at a position above the inverted cone-shaped table surface, and the plurality of oil leakage holes are evenly arranged around the circumference of the valve core.

[0007] The valve head includes an upper section, a middle section, and a lower section which are connected in sequence from top to bottom. The outer wall of the lower section cooperates with the inner wall of the valve body, the inner wall of the lower section is threadedly connected to the upper outer wall of the sleeve, a gasket is arranged between the lower surface of the middle section and the upper end surface of the sleeve, a shaft shoulder is arranged on the middle part of the rotatable valve stem, the shaft shoulder is rotatably arranged between the inner wall of the upper section and the gasket, and the upper end of the rotatable valve stem passes through the upper section and extends to the outside of the upper section.

[0008] A sealing gasket and a No. 1 O-ring are provided between the upper section and the rotatable valve stem. The sealing gasket is fixedly connected to the upper section via a nut. A No. 2 O-ring is provided between the lower section and the upper end opening of the valve body.

[0009] The valve body is arranged inside a threaded mounting hole opened on the valve block, and a sealing assembly is arranged between the valve body and the valve block, wherein the sealing assembly comprises a retaining ring and a No. 3 O-type sealing ring.

[0010] An outer hexagonal screwing surface is arranged on the outer wall of the upper end of the rotatable valve stem.

[0011] An inner hexagonal surface is arranged on the inner wall of the lower end of the sleeve, and an outer hexagonal surface is arranged on the outer wall of the upper end of the valve core.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. A threaded plug-in stop valve of the present invention comprises a valve body, a valve head, a sleeve, a valve core, and a rotatable valve stem. The valve body is a cylindrical structure with upper and lower openings. The upper inner wall of the valve body matches the lower outer wall of the valve head arranged outside the valve block. The lower end of the valve body is inserted into the valve block. The lower end of the valve body is evenly provided with a plurality of A ports around its circumference. The A ports and the lower opening of the valve body are both connected to the hydraulic oil circuit arranged outside the valve block. An inclined surface is provided on the inner wall of the lower opening. The upper outer wall of the sleeve is threadedly connected to the lower inner wall of the valve head. The lower outer wall of the sleeve is threadedly connected to the lower inner wall of the valve body. The valve core is a barrel-shaped structure with an upper opening. The upper outer wall of the valve core matches the lower inner wall of the sleeve. The outer wall of the lower end of the valve core is provided with an inverted cone table surface that cooperates with the inclined surface seal, the outer wall of the lower end of the rotatable valve stem is threadedly connected with the inner wall of the upper end of the valve core, the middle part of the rotatable valve stem is axially fixed on the valve head, and the upper end of the rotatable valve stem passes through the middle part of the valve head and extends to the outside of the valve head. On the one hand, this design can be directly inserted into the valve block, greatly reducing the space occupied by the stop valve, and is suitable for hydraulic systems with small installation space. On the other hand, the rotatable valve stem rotates clockwise / counterclockwise to drive the valve core to move up / down in the sleeve, thereby causing the inclined surface to break contact / seal with the inverted cone table surface, thereby controlling the opening / closing of the stop valve. The stop valve has a simple and compact structure and a high degree of integration. Therefore, the present invention is not only simple and compact in structure, but also occupies a small space, and is suitable for hydraulic systems with small installation space.

[0014] 2. In a threaded plug-in stop valve of the present invention, a plurality of oil drain holes are provided on the valve core above the inverted conical table surface, and the plurality of oil drain holes are evenly arranged around the circumference of the valve core. This design ensures that the valve core will not be affected by the hydraulic oil leaking into the valve core and its up and down movement in the sleeve through the oil drain holes, thereby ensuring the smooth operation of the stop valve and high reliability. Therefore, the present invention has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present invention when it is closed.

[0016] Figure 2 It is a structural diagram of the present invention when it is opened.

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the valve body.

[0018] Figure 4 for Figure 1 Schematic diagram of the structure of the middle valve core.

[0019] Figure 5 for Figure 1 Schematic diagram of the structure of the rotatable valve stem.

[0020] Figure 6 for Figure 1 Schematic diagram of the structure of the middle sleeve.

[0021] Figure 7 for Figure 1 Schematic diagram of the structure of the middle valve head.

[0022] In the figure, valve block 1, threaded mounting hole 11, valve body 2, A port 21, lower end opening 22, inclined surface 221, upper end opening 23, valve head 3, upper section 31, sealing gasket 311, No. 1 O-ring 312, middle section 32, lower section 33, No. 2 O-ring 331, sleeve 4, valve core 5, inverted cone table 51, oil drain hole 52, rotatable valve stem 6, shaft shoulder 61, gasket 7, sealing assembly 8, retaining ring 81, No. 3 O-ring 82. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with specific implementation modes.

[0024] See also Figures 1 to 7A threaded plug-in stop valve, the stop valve comprises a valve body 2, a valve head 3, a sleeve 4, a valve core 5, and a rotatable valve stem 6. The valve body 2 is a cylindrical structure with upper and lower openings. The upper inner wall of the valve body 2 matches the lower outer wall of the valve head 3 arranged outside the valve block 1. The lower end of the valve body 2 is inserted into the valve block 1. The lower end of the valve body 2 is evenly provided with a plurality of A ports 21 around its circumference. The A ports 21 and the lower end opening 22 of the valve body 2 are both connected to the hydraulic oil circuit arranged outside the valve block 1. The inner wall of the lower end opening 22 is provided with an inclined surface 221. The upper outer wall of the sleeve 4 is threadedly connected to the lower inner wall of the valve head 3, and the lower outer wall of the sleeve 4 is threadedly connected to the lower inner wall of the valve body 2. The valve core 5 is a barrel-shaped structure with an open upper end. The upper outer wall of the valve core 5 cooperates with the lower inner wall of the sleeve 4. The lower outer wall of the valve core 5 is provided with an inverted cone table 51 that seals with the inclined surface 221. The lower outer wall of the rotatable valve stem 6 is threadedly connected to the upper inner wall of the valve core 5. The middle part of the rotatable valve stem 6 is axially fixed on the valve head 3, and the upper end of the rotatable valve stem 6 passes through the middle part of the valve head 3 and extends to the outside of the valve head 3.

[0025] A plurality of oil drain holes 52 are formed on the valve core 5 at a portion above the inverted conical table surface 51 , and the plurality of oil drain holes 52 are evenly arranged around the circumference of the valve core 5 .

[0026] The valve head 3 includes an upper section 31, a middle section 32, and a lower section 33 which are connected in sequence from top to bottom. The outer wall of the lower section 33 cooperates with the inner wall of the valve body 2, and the inner wall of the lower section 33 is threadedly connected to the outer wall of the upper end of the sleeve 4. A gasket 7 is arranged between the lower surface of the middle section 32 and the upper end surface of the sleeve 4. A shoulder 61 is arranged on the middle part of the rotatable valve stem 6. The shoulder 61 is rotatably arranged between the inner wall of the upper section 31 and the gasket 7. The upper end of the rotatable valve stem 6 passes through the upper section 31 and extends to the outside of the upper section 31.

[0027] A sealing gasket 311 and a No. 1 O-ring 312 are provided between the upper section 31 and the rotatable valve stem 6 . The sealing gasket 311 is fixedly connected to the upper section 31 via a nut. A No. 2 O-ring 331 is provided between the lower section 33 and the upper end opening 23 of the valve body 2 .

[0028] The valve body 2 is disposed inside a threaded mounting hole 11 opened on the valve block 1 . A sealing assembly 8 is disposed between the valve body 2 and the valve block 1 . The sealing assembly 8 includes a retaining ring 81 and a No. 3 O-ring 82 .

[0029] An outer hexagonal screwing surface is arranged on the outer wall of the upper end of the rotatable valve stem 6 .

[0030] An inner hexagonal surface is arranged on the inner wall of the lower end of the sleeve 4 , and an outer hexagonal surface is arranged on the outer wall of the upper end of the valve core 5 .

[0031] The principle of the present invention is described as follows:

[0032] Since the rotatable valve stem 6 is axially fixed on the valve head 3 by the shaft shoulder 61, the rotatable valve stem 6 cannot move axially but can only rotate. Since the inner wall of the lower end of the sleeve 4 and the outer wall of the upper end of the valve core 5 are hexagonal surfaces, the valve core 5 cannot rotate but can only move axially. When the stop valve needs to be opened, the rotatable valve stem 6 is rotated clockwise, and the rotatable valve stem 6 drives the valve core 5 to move upward in the sleeve, so that the inverted cone table 51 provided on the outer wall of the lower end of the valve core 5 is out of contact with the inclined surface 221 provided on the inner wall of the lower end opening 22, the A port 21 is connected with the lower end opening 22, and the stop valve is opened. When the stop valve needs to be closed, the rotatable valve stem 6 is rotated counterclockwise, and the rotatable valve stem 6 drives the valve core 5 to move downward in the sleeve, so that the inverted cone table 51 is sealed with the inclined surface 221, the A port 21 is disconnected from the lower end opening 22, and the stop valve is closed.

[0033] Embodiment 1:

[0034] See also Figures 1 to 6 A threaded plug-in stop valve comprises a valve body 2, a valve head 3, a sleeve 4, a valve core 5 and a rotatable valve stem 6. The valve body 2 is a cylindrical structure with upper and lower openings. The upper inner wall of the valve body 2 matches the lower outer wall of the valve head 3 arranged outside the valve block 1. The lower end of the valve body 2 is inserted into the threaded mounting hole 11 opened on the valve block 1. The lower end of the valve body 2 is evenly provided with four A ports 21 around its circumference. The A ports 21 and the lower opening 22 of the valve body 2 are both connected to the hydraulic oil circuit arranged outside the valve block 1. An inclined surface 221 is provided on the inner wall of the lower opening 22. The upper outer wall of the sleeve 4 is threadedly connected to the lower inner wall of the valve head 3. The lower outer wall of the sleeve 4 is threadedly connected to the lower inner wall of the valve body 2. An inner hexagonal surface is provided on the inner wall of the lower end of the cylinder 4, and the valve core 5 is a barrel-shaped structure with an opening at the upper end. An outer hexagonal surface matching the inner hexagonal surface is provided on the outer wall of the upper end of the valve core 5, and an inverted cone table 51 sealingly matched with the inclined surface 221 is provided on the outer wall of the lower end of the valve core 5. Two oil drain holes 52 are provided on the portion of the valve core 5 located above the inverted cone table 51, and the two oil drain holes 52 are symmetrically arranged on the valve core 5. The outer wall of the lower end of the rotatable valve stem 6 is connected to the inner wall of the upper end of the valve core 5 by a left-handed thread, and the middle part of the rotatable valve stem 6 is axially fixed on the valve head 3. The upper end of the rotatable valve stem 6 passes through the middle part of the valve head 3 and extends to the outside of the valve head 3. An outer hexagonal screwing surface is provided on the outer wall of the upper end of the rotatable valve stem 6.

[0035] Embodiment 2:

[0036] The difference from Example 1 is that:

[0037] See also Figure 7The valve head 3 includes an upper section 31, a middle section 32, and a lower section 33 which are connected in sequence from top to bottom. The outer wall of the lower section 33 matches the inner wall of the upper end of the valve body 2, and the inner wall of the lower section 33 is threadedly connected to the outer wall of the upper end of the sleeve 4. A gasket 7 is arranged between the lower surface of the middle section 32 and the upper end surface of the sleeve 4. A shaft shoulder 61 is arranged on the middle part of the rotatable valve stem 6. The shaft shoulder 61 is rotatably arranged between the inner wall of the upper section 31 and the gasket 7. The upper end of the rotatable valve stem 6 passes through the upper section 31 and extends to the outside of the upper section 31.

[0038] Embodiment 3:

[0039] The difference from Example 2 is that:

[0040] See also Figure 1 , Figure 2 A sealing gasket 311 and a No. 1 O-ring 312 are provided between the upper section 31 and the rotatable valve stem 6. The sealing gasket 311 is fixedly connected to the upper section 31 through a nut. A No. 2 O-ring 331 is provided between the lower section 33 and the upper end opening 23 of the valve body 2.

[0041] Embodiment 4:

[0042] The difference from Example 1 is that:

[0043] See also Figure 1 , Figure 2 A sealing assembly 8 is provided between the inner wall of the threaded mounting hole 11 and the outer wall of the valve body 2 , and the sealing assembly 8 includes a retaining ring 81 and a No. 3 O-ring 82 .

Claims

1. A threaded plug-in stop valve, characterized in that: The stop valve comprises a valve body (2), a valve head (3), a sleeve (4), a valve core (5), and a rotatable valve stem (6); the valve body (2) is a cylindrical structure with upper and lower openings; the upper inner wall of the valve body (2) cooperates with the lower outer wall of the valve head (3) arranged outside the valve block (1); the lower end of the valve body (2) is inserted into the valve block (1); the lower end of the valve body (2) is evenly provided with a plurality of A ports (21) around its circumference; the A ports (21) and the lower end opening (22) of the valve body (2) are both in communication with a hydraulic oil circuit arranged outside the valve block (1); an inclined surface (221) is provided on the inner wall of the lower end opening (22); the sleeve (4 ) is threadedly connected to the lower inner wall of the valve head (3), the lower outer wall of the sleeve (4) is threadedly connected to the lower inner wall of the valve body (2), the valve core (5) is a barrel-shaped structure with an upper end opening, the upper outer wall of the valve core (5) is matched with the lower inner wall of the sleeve (4), the lower outer wall of the valve core (5) is provided with an inverted cone table (51) that is sealed with the inclined surface (221), the lower outer wall of the rotatable valve stem (6) is threadedly connected to the upper inner wall of the valve core (5), the middle part of the rotatable valve stem (6) is axially fixed on the valve head (3), and the upper end of the rotatable valve stem (6) passes through the middle part of the valve head (3) and then extends to the outside of the valve head (3).

2. A threaded cartridge stop valve according to claim 1, characterized in that: A plurality of oil drain holes (52) are provided on the valve core (5) at a location above the inverted cone-shaped table surface (51), and the plurality of oil drain holes (52) are evenly arranged around the circumference of the valve core (5).

3. A threaded cartridge stop valve according to claim 1 or 2, characterized in that: The valve head (3) comprises an upper section (31), a middle section (32), and a lower section (33) which are connected in sequence from top to bottom. The outer wall of the lower section (33) matches the inner wall of the valve body (2). The inner wall of the lower section (33) is threadedly connected to the outer wall of the upper end of the sleeve (4). A gasket (7) is arranged between the lower surface of the middle section (32) and the upper end surface of the sleeve (4). A shaft shoulder (61) is arranged on the middle part of the rotatable valve stem (6). The shaft shoulder (61) is rotatably arranged between the inner wall of the upper section (31) and the gasket (7). The upper end of the rotatable valve stem (6) passes through the upper section (31) and extends to the outside of the upper section (31).

4. A threaded cartridge stop valve according to claim 3, characterized in that: A sealing gasket (311) and a first O-ring (312) are provided between the upper section (31) and the rotatable valve stem (6); the sealing gasket (311) is fixedly connected to the upper section (31) via a nut; and a second O-ring (331) is provided between the lower section (33) and the upper opening (23) of the valve body (2).

5. A threaded cartridge stop valve according to claim 1 or 2, characterized in that: The valve body (2) is arranged inside a threaded mounting hole (11) opened on the valve block (1), and a sealing assembly (8) is arranged between the valve body (2) and the valve block (1), wherein the sealing assembly (8) comprises a retaining ring (81) and a No. 3 O-type sealing ring (82).

6. A threaded cartridge stop valve according to claim 1 or 2, characterized in that: An outer hexagonal screwing surface is provided on the outer wall of the upper end of the rotatable valve stem (6).

7. A threaded cartridge stop valve according to claim 1 or 2, characterized in that: An inner hexagonal surface is provided on the inner wall of the lower end of the sleeve (4), and an outer hexagonal surface is provided on the outer wall of the upper end of the valve core (5).

Images