A plunger-type discharge valve

Abstract

This utility model relates to the field of valve technology and discloses a plunger-type discharge valve. The plunger-type discharge valve includes a valve body, a valve cap at one end of the valve body, and a valve cover at the other end. A valve stem is disposed inside the valve cover, and packing is disposed inside the valve body. The valve stem is integrally formed by a rod and a plunger. The outer surface of the rod has external threads, and the inner wall of the valve cover has internal threads that match the external threads. The valve stem is threaded into the valve cover via the external threads. This utility model reduces external leakage points of pressure-bearing components by optimizing the plunger sealing structure, thereby increasing the valve's sealing reliability and lifespan. By optimizing the switch limiting structure and packing clamping structure, the number of parts is significantly reduced, lowering the overall cost of the valve and enhancing the product's market competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a plunger-type discharge valve. Background Technology

[0002] In the conventional structure of a plunger-type discharge valve, the valve stem drives the plunger to move up and down when the valve is opened and closed. There are two packings in the valve body cavity, which are pressed together by a bushing and a packing gland. The packing is sealed with an appropriate interference fit between the plunger and the valve body to prevent internal and external leakage.

[0003] However, the above structure has many drawbacks: during valve opening and closing, the plunger and upper packing are disengaged for a period of time. With each valve opening and closing cycle, the upper packing wears out more severely, leading to a shorter seal life. Furthermore, if this seal fails, it can cause leakage of the medium at the screw, with serious consequences. Additionally, the valve's opening and closing position is limited by the cooperation of the guide plate and the column. This structure has many parts and requires significant vertical space, resulting in substantial waste in manufacturing costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a plunger-type discharge valve. This solves the problem that during valve opening and closing, the plunger and upper packing are in a disengaged state for a period of time. With increasing valve opening and closing frequency, the upper packing wears more severely, leading to a shorter seal life. Furthermore, if this seal fails, it can cause media leakage at the screw, with serious consequences. Additionally, the valve's opening and closing position is limited by the cooperation of the guide plate and the column. This structure has many parts and requires significant vertical space, resulting in substantial waste in manufacturing costs.

[0005] This utility model provides the following technical solution: a plunger-type discharge valve, including a valve body, a valve cap provided at one end of the valve body, a valve cover provided at the other end of the valve body, a valve stem provided inside the valve cover, and packing provided inside the valve body;

[0006] The valve stem is made by combining a stem and a plunger into one piece. The outer surface of the stem is provided with an external thread, and the inner wall of the valve cover is provided with an internal thread that matches the external thread. The valve stem is installed inside the valve cover by the external thread.

[0007] Preferred technical solution 1: The upper plunger of the valve stem is provided with an inclined surface, which is used to cooperate with the sealing surface of the valve cap to achieve sealing. The lower rod of the valve stem is provided with an inclined surface, which cooperates with the inclined surface of the valve cover to limit the valve to the fully open position.

[0008] Preferred technical solution 2: The valve cover and the valve body are both provided with matching threaded holes, and screws are installed inside the threaded holes. The valve cover and the valve body are positioned and locked together by the screws.

[0009] Preferred technical solution 3: A gasket is provided between the valve cap and the valve body.

[0010] Preferred technical solution four: A handwheel is provided at one end of the valve stem located on the outside of the valve body.

[0011] Preferred technical solution five: A handwheel nut is threadedly installed at one end of the valve stem located on the outside of the valve body, and a washer is provided between the handwheel nut and the handwheel.

[0012] Compared with existing technologies, this utility model provides a plunger-type discharge valve with the following advantages: First, by designing the valve stem and plunger as an integral structure, the bushing and upper packing inside the valve body are eliminated. The valve stem's upper inclined surface cooperates with the valve cap's sealing surface for sealing, and the sealing surface can be hardened. This effectively solves the problems of easy wear of the upper packing and short sealing life in traditional structures, eliminating the risk of media leakage due to seal failure and improving sealing reliability and service life. Second, the valve's fully closed and fully open positions are limited by the upper and lower inclined surfaces of the valve stem cooperating with the inclined surfaces of the valve cap and valve cover, respectively. This eliminates the need for traditional guide plates and column structures, while also... The packing gland and valve cover are designed as a single unit. The valve cover directly engages with the valve stem via threads, eliminating components such as the valve stem nut and gland nut. This significantly reduces the number of parts, lowers manufacturing costs, and reduces the need for vertical space. Furthermore, the reduced number of parts lowers assembly complexity and improves assembly efficiency. The elimination of the valve stem nut and other components also reduces friction during valve operation, lowering the switching torque and making valve operation smoother. In addition, the valve body eliminates the upper packing and bushing, removing screw holes found in traditional structures and preventing external leakage points, thus increasing valve safety and comprehensively enhancing the product's market competitiveness. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Handwheel nut; 2. Washer; 3. Handwheel; 4. Valve cover; 5. Screw; 6. Packing; 7. Valve body; 8. Valve stem; 9. Gasket; 10. Valve cap. Detailed Implementation

[0016] Please see Figure 1-2 ,

[0017] Example 1: A plunger-type discharge valve includes a valve body 7, a valve cap 10 is provided at one end of the valve body 7, a valve cover 4 is provided at the other end of the valve body 7, a valve stem 8 is provided inside the valve cover 4, and packing 6 is provided inside the valve body 7.

[0018] The valve stem 8 is made by combining the stem and the plunger into one piece. The outer surface of the stem of the valve stem 8 is provided with external threads, and the inner wall of the valve cover 4 is provided with internal threads that match the external threads. The valve stem 8 is installed inside the valve cover 4 through the external threads.

[0019] Example 2: The difference between this example and Example 1 is that the upper plunger of the valve stem 8 is provided with an inclined surface, which is used to cooperate with the sealing surface of the valve cap 10 to achieve sealing. The lower stem of the valve stem 8 is provided with an inclined surface, which cooperates with the inclined surface of the valve cover 4 to limit the valve to the fully open position.

[0020] Example 3: The difference between this example and Example 1 is that the valve cover 4 and the valve body 7 are both provided with matching threaded holes on their surfaces, and screws 5 are installed inside the threaded holes. The valve cover 4 and the valve body 7 are positioned and locked together by the screws 5.

[0021] Example 4: The difference between this example and Example 1 is that a gasket 9 is provided between the valve cap 10 and the valve body 7.

[0022] Example 5: The difference between this example and Example 1 is that a handwheel 3 is provided at one end of the valve stem 8 located outside the valve body 7.

[0023] Example 6: The difference between this example and Example 1 is that the stem of the valve stem 8 is threaded with a handwheel nut 1 at one end located on the outside of the valve body 7, and a washer 2 is provided between the handwheel nut 1 and the handwheel 3.

[0024] In summary, when operating this plunger-type discharge valve, the operator turns the handwheel 3. The handwheel 3, through the cooperation of the handwheel nut 1 and the washer 2, drives the valve stem 8 to rotate. Since the outer surface of the valve stem 8 has an external thread that matches the internal thread of the valve cover 4, the valve stem 8 moves axially along the valve cover 4 while rotating. When the valve needs to be closed, the valve stem 8 moves upward, and the inclined surface at the upper plunger gradually comes into contact with the sealing surface of the valve cap 10. The sealing is achieved through the cooperation of the inclined surfaces of the two, and at the same time, the valve is limited to the fully closed position. The gasket 9 between the valve cap 10 and the valve body 7 further ensures the sealing performance at this point. When the valve needs to be opened, the handwheel 3 is turned in the opposite direction, and the valve stem 8 moves downward. The inclined surface of its lower end gradually engages with the inclined surface of the valve cover 4 to achieve the limit of the valve in the fully open position. Throughout the process, the packing 6 inside the valve body 7 plays an auxiliary sealing role, while the valve cover 4 and the valve body 7 are locked together by screws 5 to ensure the stability of the overall valve structure. Furthermore, since the valve stem 8 is an integrated structure combining the stem and the plunger, friction between components is reduced, making the valve opening and closing process smoother.

Claims

1. A plunger type let-down valve comprising a valve body (7), characterized in that: A valve cap (10) is provided at one end of the valve body (7), a valve cover (4) is provided at the other end of the valve body (7), a valve stem (8) is provided inside the valve cover (4), and a packing (6) is provided inside the valve body (7). The valve stem (8) is made by combining the stem and the plunger into one piece. The outer surface of the stem of the valve stem (8) is provided with an external thread, and the inner wall of the valve cover (4) is provided with an internal thread that matches the external thread. The valve stem (8) is installed inside the valve cover (4) by the external thread.

2. The plunger-type discharge valve according to claim 1, characterized in that: The upper plunger of the valve stem (8) is provided with an inclined surface, which is used to cooperate with the sealing surface of the valve cap (10) to achieve sealing. The lower rod of the valve stem (8) is provided with an inclined surface, which cooperates with the inclined surface of the valve cover (4) to limit the valve to the fully open position.

3. A plunger-type discharge valve according to claim 1, characterized in that: Both the valve cover (4) and the valve body (7) have matching threaded holes on their surfaces. Screws (5) are installed inside the threaded holes, and the valve cover (4) and the valve body (7) are positioned and locked together by the screws (5).

4. A plunger-type discharge valve according to claim 1, characterized in that: A gasket (9) is provided between the valve cap (10) and the valve body (7).

5. A plunger-type discharge valve according to claim 1, characterized in that: A handwheel (3) is provided at one end of the valve stem (8) located outside the valve body (7).

6. A plunger-type discharge valve according to claim 5, characterized in that: The valve stem (8) has a handwheel nut (1) threaded onto one end of the stem located on the outside of the valve body (7), and a washer (2) is provided between the handwheel nut (1) and the handwheel (3).

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