Connecting structure of valve rod and valve clack of stop valve

Abstract

A connecting structure of a valve rod and a valve clack of a stop valve comprises the valve rod (2), the valve clack (5) and a valve seat (7) which is arranged on a valve body (4), and is characterized in that the top face of the valve clack extends upwards to form two lug plates (6), the lower end of the valve rod extends to form a plate body (1), the plate body is inserted between the two lug plates, gaps are formed between the plate body and the lug plates, a mandrel (3) penetrates through the plate body and the two lug plates, and the mandrel (3) is connected with the valve clack (5). And a gap is reserved between the mandrel and the lug plate. The valve has the beneficial effects that the connecting structure between the valve clack and the valve rod is simple and reliable, the valve clack can translate and turn over relative to the valve rod, and the valve seat has a guiding effect on downward movement of the valve clack, so that the valve clack can be in full contact with the valve seat; even if the axis of the valve rod does not coincide with the center line of the valve seat, the valve clack and the valve seat can be centered automatically; therefore, the adverse effect of assembly errors between the valve body and the valve cover and between the valve rod and the valve clack can be eliminated.

Description

Technical Field

[0001] The utility model relates to a connection structure between a valve stem and a valve disc of a stop valve. Background Art

[0002] A globe valve comprises a valve body, a valve cover, a valve stem, a valve disc, and a valve seat. The valve body is sealed to the valve cover, the valve stem passes through the valve cover, and a sealing packing is provided between the valve stem and the valve cover. The lower end of the valve stem is connected to the valve disc, and the valve disc and valve seat are tapered. When the valve stem is raised, the valve disc separates from the valve seat, opening the globe valve. When the valve stem is lowered, the valve disc can fit tightly against the valve seat, closing the globe valve. Existing valve stems and valve discs are fixedly connected. If there are assembly errors between the valve body and valve cover, and between the valve stem and valve disc, it will be difficult for the valve stem, valve disc, and valve seat to be coaxial. When the globe valve is closed, the valve disc and valve seat will come into unilateral contact. To ensure a tight closure of the globe valve, sufficient pressure must be applied to the valve disc to ensure full contact with the valve seat. However, this can damage the valve stem due to bending and cause friction between the valve disc and valve seat. Utility Model Content

[0003] The technical problem to be solved by the utility model is to improve a connection structure between a valve stem and a valve disc of a stop valve, in which, when there are assembly errors between the valve body and the valve cover and between the valve stem and the valve disc, only normal pressure needs to be applied to the valve disc to make the valve disc fully contact with the valve seat, the valve stem will not be damaged, and there is no friction between the valve disc and the valve seat.

[0004] The technical solution of the present utility model is a connection structure between the valve stem and the valve disc of a stop valve, which includes a valve stem 2, a valve disc 5, and a valve seat 7. The valve seat is arranged on a valve body 4, and is characterized in that two ear plates 6 extend upward from the top surface of the valve disc, a plate body 1 extends from the lower end of the valve stem, the plate body is inserted between the two ear plates, and a gap is formed between the plate body and the ear plates. The core shaft 3 passes through the plate body and the two ear plates, and a gap is left between the core shaft and the ear plates.

[0005] The beneficial effects of the present invention are that the connection structure between the valve disc and the valve stem is simple and reliable, the valve disc can translate and flip relative to the valve stem, and the valve seat has a guiding effect on the downward movement of the valve disc, so that the valve disc can fully contact the valve seat; even if the axis of the valve stem and the center line of the valve seat do not coincide, the valve disc and the valve seat can be automatically aligned; this can eliminate the adverse effects of assembly errors between the valve body and the valve cover and between the valve stem and the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of the present utility model.

[0007] Figure symbols: 1-plate body, 2-valve stem, 3-core shaft, 4-valve body, 5-valve disc, 6-ear plate, 7-valve seat, 8-pin. DETAILED DESCRIPTION

[0008] A connection structure between the valve stem and valve disc of a stop valve, which includes a valve stem 2, a valve disc 5, and a valve seat 7. The valve seat is arranged on a valve body 4, and two ear plates 6 extend upward from the top surface of the valve disc. A plate body 1 extends from the lower end of the valve stem, and the plate body is inserted between the two ear plates. A core shaft 3 passes through the plate body and the two ear plates.

[0009] There is a gap between the plate body and the ear plate, and a gap between the core shaft and the ear plate. The valve disc can flip around the core shaft and move along the plane. In this way, the valve disc and the valve seat can be automatically aligned to avoid unilateral contact between the valve disc and the valve seat, and can eliminate the adverse effects caused by assembly errors between the valve stem and the valve cover and between the valve stem and the valve disc (such as bending of the valve stem and wear of the valve disc and valve seat).

[0010] The plate body can be formed by symmetrically removing two arc surfaces at the lower end of the valve stem.

[0011] The lugs may be welded to the top surface of the disc.

[0012] The core shaft and the plate body can be connected by interference fit or transition fit. In this case, one end of the core shaft has a flange and the other end of the core shaft is covered with a ring body, which is connected to the core shaft through a pin 8.

[0013] Generally speaking, after the valve stem is assembled on the valve cover, the deviation error between the axis of the valve stem and the center line of the valve seat will not be greater than 2 mm, so the gap between the plate body and the ear plate is selected to be 3 mm; the gap between the core shaft and the ear plate is also selected to be 3 mm.

Claims

1. A connection structure between a valve stem and a valve disc of a stop valve, comprising a valve stem (2), a valve disc (5), and a valve seat (7), wherein the valve seat is arranged on a valve body (4), and is characterized in that: Two ear plates (6) extend upward from the top surface of the valve disc, a plate body (1) extends from the lower end of the valve stem, the plate body is inserted between the two ear plates, a gap is provided between the plate body and the ear plates, a core shaft (3) passes through the plate body and the two ear plates, and a gap is provided between the core shaft and the ear plates.

2. The connection structure between the valve stem and the valve disc of the stop valve according to claim 1 is characterized in that: The core shaft and the plate body are connected by interference fit.

3. The connection structure between the valve stem and the valve disc of the stop valve according to claim 1 is characterized in that: There is a transition fit between the core shaft and the plate body. One end of the core shaft has a flange, and the other end of the core shaft is sleeved with a ring body, which is connected to the core shaft through a pin (8).

4. The connection structure between the valve stem and the valve disc of the stop valve according to claim 1 is characterized in that: The gap between the plate body and the ear plate is selected to be 3 mm; the gap between the core shaft and the ear plate is also selected to be 3 mm.

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