Valve with reliable sealing effect

Abstract

A valve with a reliable sealing effect belongs to the technical field of mechanical manufacturing, and comprises a valve body, a valve seat, a valve rod and a valve cover, the part of the valve rod in a valve rod channel is surrounded by a sealing sleeve gasket, the sealing sleeve gasket is a sleeve body with one closed end, the opening end of the sealing sleeve gasket is provided with an outward upper edge, and the upper edge is arranged at the top end of the valve rod channel and between the valve rod channel and the valve cover. During installation, the valve rod is sleeved with the sealing sleeve gasket, then the valve rod sleeved with the sealing sleeve gasket is inserted into the valve rod channel, finally, the valve deck is screwed on the valve rod channel of the valve body, the upper edge of the sealing sleeve gasket is clamped between the valve rod channel and the valve deck, and a sealing gasket is just formed. When the valve is opened, the valve rod channel is filled with liquid with certain pressure, but due to isolation of the sealing sleeve gasket, the connecting part of the valve rod and the valve cover does not make contact with the liquid, and therefore leakage caused by the liquid is avoided. The anti-leakage valve can effectively prevent leakage of the valve, and is simple in structure, safe and reliable in performance and wide in applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical manufacturing and relates to a valve. Background Art

[0002] The existing three-way stop valve is mainly composed of a valve body, a valve seat, a valve stem and a valve cover. The valve body has an inlet chamber, an outlet chamber and a valve stem channel. The valve cover is sealed and fixed on the valve body at the top of the valve stem channel. The valve stem passes through the valve cover. The valve stem and the valve cover are generally threaded together, and the end of the valve stem corresponds to the valve seat. When the valve is opened, the liquid enters from the water inlet chamber and is discharged from the water outlet chamber through the valve seat. When the valve is closed, the valve stem is rotated so that the valve stem moves downward, and the end of the valve stem blocks the valve seat, isolating the water inlet chamber from the water outlet chamber. There is a problem with valves of this structure. When the valve is opened, the valve stem channel is filled with liquid with a certain pressure. Since the valve stem often moves relative to the valve cover, it is not easy to completely seal between the valve stem and the valve cover, and leakage is serious. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a valve with reliable sealing effect.

[0004] The utility model mainly comprises a valve body, a valve seat, a valve stem and a valve cover to form a valve. The valve body has a water inlet cavity, a water outlet cavity and a valve stem channel. The valve cover has an internal thread, and the upper part of the valve stem channel has an external thread. The internal thread of the valve cover cooperates with the external thread of the valve stem channel. The part of the valve stem in the valve stem channel is surrounded by a sealing sleeve. The sealing sleeve is a sleeve body with one end closed, and its open end has an outward upper edge, which is shaped like an inverted straw hat with a circle of brim. The upper edge is at the top of the valve stem channel, between the valve stem channel and the valve cover. During installation, the sealing sleeve is sleeved on the valve stem, and then the valve stem sleeved with the sealing sleeve is inserted into the valve stem channel. Finally, the valve cover is tightened on the valve stem channel of the valve body, and the upper edge of the sealing sleeve is clamped between the valve stem channel and the valve cover, just forming a sealing gasket. When the valve is opened, the valve stem channel is filled with liquid with a certain pressure, but due to the isolation of the sealing sleeve, the part of the valve stem connected to the valve cover does not contact the liquid, thereby avoiding the leakage caused thereby.

[0005] Although the sealing sleeve is made of a material with a certain elasticity, it is easy to be damaged as the valve stem expands and contracts over a long period of time. Adding a corrugated cavity at the waist of the sealing sleeve can effectively solve this problem. The corrugated cavity is a cavity-shaped body with transverse corrugations.

[0006] The utility model can effectively prevent the leakage of the valve, has a simple structure, safe and reliable performance and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a cross-sectional view of the utility model;

[0008] Figure 2The figure is a cross-sectional view of the sealing sleeve. DETAILED DESCRIPTION

[0009] The utility model is mainly composed of a valve body 1, a valve seat 2, a valve stem 5 and a valve cover 7. The valve body 1 has a water inlet cavity 3, a water outlet cavity 4 and a valve stem channel 6. The valve cover 7 has an internal thread, and the upper part of the valve stem channel 6 has an external thread. The internal thread of the valve cover 7 matches the external thread of the valve stem channel 6. The part of the valve stem 5 in the valve stem channel 6 is surrounded by a sealing sleeve 8. The sealing sleeve 8 is a sleeve body with one end closed, and its open end has an outward upper edge 9, and the upper edge 9 is at the top of the valve stem channel 6. There is a corrugated cavity 10 at the waist of the sealing sleeve 8.

Claims

1. A valve with reliable sealing effect, consisting of a valve body, a valve seat, a valve stem and a valve cover, characterized in that The valve cover has an internal thread and the upper part of the valve stem channel has an external thread. The internal thread of the valve cover cooperates with the external thread of the valve stem channel. The part of the valve stem in the valve stem channel is surrounded by a sealing sleeve. The sealing sleeve is a sleeve body with one end closed and an outward upper edge at its open end. The upper edge is at the top of the valve stem channel and between the valve stem channel and the valve cover.

2. The valve according to claim 1, characterized in that : The waist of the sealing sleeve is provided with a corrugated cavity.

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