Manual valve with adjustable valve head stroke

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a manual valve with an adjustable valve head stroke, which comprises a valve seat assembly, a valve rod assembly and a valve head, the valve seat assembly comprises a valve body. The valve head is arranged in the valve cavity; the valve rod assembly comprises a threaded sleeve, an upper valve rod and a lower valve rod. The lower valve rod is connected with the up-down moving valve head, and the lower valve rod and the valve seat assembly are in sliding fit and do not rotate relatively; the upper valve rod is rotationally matched with the valve seat assembly; the thread sleeve is in threaded connection with the lower valve rod; the threaded sleeve adjusts the distance between the upper valve rod and the lower valve rod, and then the stroke of the valve head is adjusted. According to the scheme, the length of the valve rod assembly is increased or decreased by adjusting the connection tightness of the threaded sleeve and the upper valve rod, so that the stroke of vertical movement of the valve head is changed, the position of the valve head in the valve cavity is extended, and after the valve head is abraded, the on-off effect can be achieved again; and the situations that the service life of a product is shortened and the turn-off capacity is invalid due to the fact that different operators exert too large force when the valve is turned off are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a manual valve with adjustable valve head stroke. Background Art

[0002] Valves are often needed in industries such as semiconductors, hydrogen energy, and electricity. After long-term use, valves are prone to damage to the sealing surface of the valve head and cause valve failure. In particular, valves with plastic valve heads for opening and closing control are more prone to wear and tear due to material reasons, which affects the use of the valve.

[0003] To this end, it is necessary to design a manual valve structure that can continue to be used even when the valve head is worn to a certain extent. The valve structure can also reduce the product life and failure of the closing ability due to excessive force when closing the valve due to different personnel through a limit sleeve. Utility Model Content

[0004] In order to solve some of the above problems existing in the prior art, the present invention provides a manual valve with adjustable valve head stroke.

[0005] The technical solution adopted by the utility model is:

[0006] A manual valve with adjustable valve head stroke, comprising a valve seat assembly, a valve stem assembly and a valve head;

[0007] The valve seat assembly comprises a valve body; a first channel, a second channel and a valve cavity are arranged in the valve body, and the valve cavity is used to connect the first channel and the second channel;

[0008] The valve head is arranged in the valve cavity, and can open or close the communication port between the valve cavity and the second channel when the valve head moves up and down;

[0009] The valve stem assembly is waterproof and sealed with the valve seat assembly, and includes a screw sleeve, an upper valve stem and a lower valve stem; the lower end of the lower valve stem extends into the valve cavity to connect and move the valve head up and down, and the lower valve stem and the valve seat assembly are slidably matched up and down and do not rotate relative to each other; the upper valve stem and the valve seat assembly are rotationally matched and do not move up and down; the lower end of the screw sleeve is threadedly connected to the lower valve stem to control the up and down movement of the lower valve stem; the upper end of the screw sleeve is threadedly connected to the upper valve stem to adjust the distance between the upper valve stem and the lower valve stem, and then adjust the stroke of the valve head when it moves up and down.

[0010] As an alternative or supplement to the above-mentioned manual valve: the valve seat assembly also includes a locking nut and a valve stem sleeve, the valve stem sleeve is arranged at the center of the locking nut, the locking nut is threadedly connected to the valve body, and the valve stem sleeve is pressed and fixed to the valve body; the upper end of the lower valve stem penetrates into the valve stem sleeve and is in slidable sealing contact with the valve stem sleeve.

[0011] As an alternative or supplement to the above manual valve: a gasket for sealing is arranged between the outer convex edge of the valve stem sleeve and the valve body, and an O-ring for sealing is arranged between the valve stem sleeve and the inner wall of the locking nut.

[0012] As an alternative or supplement to the above manual valve: a radially outwardly protruding annular disk is arranged at the lower end of the lower valve stem, and a bellows is arranged between the annular disk and the lower end of the valve stem sleeve.

[0013] As an alternative or supplement to the above-mentioned manual valve: the valve seat assembly also includes a locking sleeve, which is arranged outside the threaded sleeve and the upper valve stem; the lower end of the locking sleeve is relatively fixed to the valve body, and a limiting sleeve is arranged on the inner side of the upper end of the locking sleeve, and the lower end of the limiting sleeve is pressed against the threaded sleeve through a compression spring.

[0014] As an alternative or supplement to the above manual valve: the upper end key of the upper valve stem is connected with a handle.

[0015] As an alternative or supplement to the above manual valve: the handle is provided with a cotter pin, the limiting sleeve is provided with a fan-shaped opening, and the cotter pin extends into the fan-shaped opening to limit the angle range of rotation of the handle.

[0016] As an alternative or supplement to the above manual valve: the limiting sleeve is fixed by a second screw radially arranged on the locking sleeve.

[0017] As an alternative or supplement to the above manual valve: a compression spring is provided on the outer side of the screw sleeve, the upper end of the compression spring abuts against the limit sleeve, and the lower end abuts against the annular protrusion on the screw sleeve.

[0018] The beneficial effects of the utility model are as follows: since the valve stem assembly in the present scheme adopts multiple detachably connected parts such as the screw sleeve, the upper valve stem and the lower valve stem; therefore, the length of the valve stem assembly can be increased or decreased by adjusting the tightness of the connection between the screw sleeve and the upper valve stem, thereby changing the stroke of the valve head moving up and down, so that the position of the valve head in the valve cavity can be extended, and after the valve head is worn, the on-off effect can be realized again. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0020] Figure 1 It is a cross-sectional structural diagram of a manual valve with adjustable valve head stroke in this scheme.

[0021] In the figure: 1-valve body; 2-valve head; 3-bellows; 4-locking nut; 5-gasket; 6-locking sleeve; 7-O-ring; 8-threaded sleeve; 9-compression spring; 10-upper valve stem; 11-limiting sleeve; 12-cotter pin; 13-handle; 14-first screw; 15-second screw; 16-valve stem sleeve; 17-lower valve stem; 18-first channel; 19-second channel; 20-valve chamber. DETAILED DESCRIPTION

[0022] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment designs a manual valve with adjustable valve head stroke, including components such as a valve seat assembly, a valve stem assembly and a valve head 2. The valve stem assembly cooperates with the valve seat assembly in a waterproof and sealing manner.

[0025] The valve seat assembly includes a valve body 1, a locking sleeve 6, a locking nut 4, a limiting sleeve 11 and other components.

[0026] The valve body 1 is provided with a first channel 18, a second channel 19 and a valve cavity 20. The valve cavity 20 is used to connect the first channel 18 and the second channel 19. After gas or liquid enters the valve cavity 20 through the first channel 18 or the second channel 19, it can be discharged from the second channel 19 or the first channel 18.

[0027] The valve head 2 is arranged in the valve cavity 20. When the valve head 2 moves up and down, it can open or close the communication port between the valve cavity 20 and the second channel 19; when the valve head 2 moves downward, the communication port can be sealed, and when the valve head 2 moves upward, the communication port can be opened.

[0028] The valve stem assembly includes components such as a screw sleeve 8, an upper valve stem 10 and a lower valve stem 17; the lower end of the lower valve stem 17 extends into the valve cavity 20, and the lower valve stem 17 is connected to the valve head 2. When the lower valve stem 17 moves up and down, it can drive the valve head 2 to move up and down. The lower end of the screw sleeve 8 is threadedly connected to the lower valve stem 17 to control the up and down movement of the lower valve stem 17; the upper end of the screw sleeve 8 is threadedly connected to the upper valve stem 10 to adjust the distance between the upper valve stem 10 and the lower valve stem 17, and then adjust the stroke of the valve head 2 when it moves up and down. Specifically: the upper valve stem 10 is rotatably matched with the valve seat assembly. When the upper valve stem 10 rotates, it can drive the screw sleeve 8 to rotate synchronously, so that the lower valve stem 17 and the valve head 2 can move up and down through the threaded matching relationship between the screw sleeve 8 and the lower valve stem 17. In addition, when the connection between the screw sleeve 8 and the upper valve stem 10 is tightened or loosened, while ensuring that the screw sleeve 8 and the upper valve stem 10 do not rotate relative to each other during the valve opening and closing process, the distance between the upper valve stem 10 and the lower valve stem 17 can be increased or decreased, thereby changing the up and down movement stroke of the valve head 2.

[0029] The lower valve stem 17 is slidably matched with the valve stem sleeve 16 or the valve body 1 without relative rotation, so that the rotation of the upper valve stem 10 can be converted into the up and down movement of the lower valve stem 17. The lower end of the lower valve stem 17 is provided with a radially outwardly protruding annular disk, and a bellows 3 is provided between the annular disk and the lower end of the valve stem sleeve 16. When the lower valve stem 17 moves telescopically, the bellows 3 changes in telescopic movement.

[0030] The valve stem sleeve 16 is arranged at the center of the locking nut 4, and the locking nut 4 is threadedly connected to the valve body 1, and the valve stem sleeve 16 is pressed and fixed to the valve body 1; the upper end of the lower valve stem 17 penetrates the valve stem sleeve 16 and is in slidable sealing contact with the valve stem sleeve 16. A gasket 5 for sealing is arranged between the outer convex edge of the valve stem sleeve 16 and the valve body 1, and an O-ring for sealing is arranged between the valve stem sleeve 16 and the inner wall of the locking nut 4.

[0031] The locking sleeve 6 is sleeved on the outside of the threaded sleeve 8 and the upper valve stem 10; the lower end of the locking sleeve 6 is threadedly connected to the locking nut 4, so as to achieve relative fixation with the valve body 1, and a limiting sleeve 11 is arranged on the inner side of the upper end of the locking sleeve 6, and the limiting sleeve 11 is tightened and fixed by a second screw 15 radially to the locking sleeve 6.

[0032] A compression spring 9 is provided on the outer side of the screw sleeve 8, the upper end of the compression spring 9 abuts against the limit sleeve 11, and the lower end abuts against the annular protrusion on the screw sleeve 8. The compression spring 9 can increase the stability of the connection between the upper valve stem 10 and the screw sleeve 8, thereby reducing the relative rotation of the upper valve stem 10 and the screw sleeve 8, and reducing the occurrence of changes in the stroke of the valve head 2 when the valve is in use.

[0033] The upper end of the upper valve stem 10 is keyed to a handle 13, so that the rotation of the screw sleeve 8 and the upper valve stem 10 is controlled by the handle 13. The handle 13 is provided with a split pin 12, and the limiting sleeve 11 is provided with a fan-shaped opening, and the split pin 12 extends into the fan-shaped opening to limit the angle range of rotation of the handle 13. The split pin and the limiting sleeve can achieve a limiting effect, thereby reducing the occurrence of product life reduction and failure of the closing ability due to excessive force when the valve is closed due to different operators.

[0034] In the structure of this embodiment, when the valve head is worn out after long-term use and the valve cavity is not sealed tightly, the distance between the upper valve stem 10 and the lower valve stem 17 can be increased by rotating the screw sleeve 8, so that the valve head is closer to the connecting port, thereby realizing the on / off operation of the valve cavity.

[0035] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A manual valve with adjustable valve head stroke, characterized in that: It includes a valve seat assembly, a valve stem assembly and a valve head (2); The valve seat assembly comprises a valve body (1); a first channel (18), a second channel (19) and a valve cavity (20) are arranged in the valve body (1); the valve cavity (20) is used to connect the first channel (18) and the second channel (19); The valve head (2) is arranged in the valve cavity (20), and the valve head (2) can open or close the communication port between the valve cavity (20) and the second channel (19) when it moves up and down; The valve stem assembly cooperates with the valve seat assembly in a waterproof and sealing manner, and comprises a screw sleeve (8), an upper valve stem (10) and a lower valve stem (17); the lower end of the lower valve stem (17) extends into the valve cavity (20) to connect and move the valve head (2) up and down, and the lower valve stem (17) and the valve seat assembly slide up and down and do not rotate relative to each other; the upper valve stem (10) and the valve seat assembly rotate and do not move up and down; the lower end of the screw sleeve (8) is threadedly connected to the lower valve stem (17) to control the up and down movement of the lower valve stem (17); the upper end of the screw sleeve (8) is threadedly connected to the upper valve stem (10) to adjust the distance between the upper valve stem (10) and the lower valve stem (17), thereby adjusting the stroke of the valve head (2) when it moves up and down.

2. The manual valve with adjustable valve head stroke according to claim 1, characterized in that: The valve seat assembly also includes a locking nut (4) and a valve stem sleeve (16). The valve stem sleeve (16) is arranged at the center of the locking nut (4). The locking nut (4) is threadedly connected to the valve body (1) and presses the valve stem sleeve (16) to be fixed to the valve body (1); the upper end of the lower valve stem (17) penetrates into the valve stem sleeve (16) and is in slidable sealing contact with the valve stem sleeve (16).

3. The manual valve with adjustable valve head stroke according to claim 2, characterized in that: A gasket (5) for sealing is arranged between the outer convex edge of the valve stem sleeve (16) and the valve body (1), and an O-ring for sealing is arranged between the valve stem sleeve (16) and the inner wall of the locking nut (4).

4. The manual valve with adjustable valve head stroke according to claim 2, characterized in that: The lower end of the lower valve stem (17) is provided with a radially outwardly protruding annular disk, and a bellows (3) is provided between the annular disk and the lower end of the valve stem sleeve (16).

5. The manual valve with adjustable valve head stroke according to any one of claims 1 to 4, characterized in that: The valve seat assembly also includes a locking sleeve (6), which is sleeved on the threaded sleeve (8) and the upper valve stem (10); the lower end of the locking sleeve (6) is relatively fixed to the valve body (1), and a limiting sleeve (11) is arranged on the inner side of the upper end of the locking sleeve (6), and the lower end of the limiting sleeve (11) is pressed against the threaded sleeve (8) through a compression spring (9).

6. The manual valve with adjustable valve head stroke according to claim 5, characterized in that: The upper end of the upper valve stem (10) is keyed to a handle (13).

7. The manual valve with adjustable valve head stroke according to claim 6, characterized in that: The handle (13) is provided with a cotter pin (12), and the limiting sleeve (11) is provided with a fan-shaped opening, and the cotter pin (12) extends into the fan-shaped opening to limit the rotation angle range of the handle (13).

8. The manual valve with adjustable valve head stroke according to claim 5, characterized in that: The limiting sleeve (11) is fixed by a second screw (15) radially opposite to the locking sleeve (6).

9. The manual valve with adjustable valve head stroke according to claim 5, characterized in that: A compression spring (9) is sleeved on the outer side of the screw sleeve (8), the upper end of the compression spring (9) abuts against the limiting sleeve (11), and the lower end of the compression spring (9) abuts against the annular protrusion on the screw sleeve (8).

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