CN211009911U - a shut-off valve - Google Patents

Abstract

The utility model provides a globe valve, which relates to the technical field of valves, has the advantages of good sealing and long service life, and comprises a valve body, a valve stem and a valve cover. The valve body is provided with a liquid inlet and a liquid outlet, wherein, The liquid inlet and the liquid outlet are connected to the control cavity in the valve body, the valve cover is pressed on the valve body, the valve stem is penetrated on the valve cover, and extends into the control cavity in the valve body, and the valve stem is engaged by the thread The valve core is fixed on the valve cover, the valve core is fixed at the tail of the valve stem, the valve core and the valve stem tail are connected by bearings, the valve core closely fits the control cavity, and the valve core moves up and down through the rotation of the valve stem, thereby blocking the valve. A liquid inlet, wherein the valve core is provided with an accommodating cavity, the accommodating cavity is a cavity with a narrow inlet and a wide interior, and a piston rod and a piston fixed on the end of the piston rod are arranged in the accommodating cavity along the axial direction. , the piston is close to the inner wall of the accommodating cavity, the rear of the piston and the piston rod are sleeved with elastic parts.

Description

a shut-off valve

technical field

The utility model relates to the technical field of valves, in particular to a shut-off valve.

Background technique

Globe valve is the most widely used valve. Due to the small friction between the sealing surfaces during the opening and closing process, it is relatively durable, the opening height is not large, the manufacturing is easy, and the maintenance is convenient. It is not only suitable for medium and low pressure environments, but also suitable for high pressure environments. The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit to prevent the flow of the medium.

In the prior art, the valve core is used to seal the stop valve to block the liquid inlet and outlet inside the stop valve. However, when the water pressure is too high, due to the lack of a buffer energy-absorbing device in the stop valve, the valve core appears under relatively high pressure. Damaged, affecting the normal use of the valve.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a novel cut-off valve, which has the advantages of good sealing and long service life.

The utility model adopts the following technical scheme to realize: a shut-off valve, comprising a valve body, a valve stem and a valve cover, the valve body is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are connected to the valve body The valve cover is press-fitted on the valve body, the valve stem is worn on the valve cover and extends into the control cavity in the valve body, the valve stem is fixed on the valve cover by threaded engagement, and the tail of the valve stem is The valve core is fixed, the valve core and the tail of the valve stem are connected by a bearing, the valve core closely fits the control cavity, and the valve core drives the valve core to move up and down through the rotation of the valve stem, thereby blocking the liquid inlet, wherein the valve core is provided with a accommodating cavity, the accommodating cavity is a cavity with a narrow inlet and a wide interior, a piston rod and a piston fixed on the end of the piston rod are arranged in the accommodating cavity along the axial direction, the piston is close to the inner wall of the accommodating cavity, The piston rod is sleeved with elastic parts.

Preferably, the elastic member sleeved on the piston rod is a coil spring.

Preferably, at least a pair of sealing grooves are symmetrically arranged on the inner wall of the control chamber, and the sealing grooves are filled with sealing elements.

Preferably, a stopper is provided on the inner wall of the control cavity body, and the stopper is arranged on the lower side of the liquid inlet, and a buffer pad is arranged on the surface of the stopper.

Preferably, the valve core body is provided with a ventilation hole, and the ventilation hole is connected to the end of the accommodating cavity, and the ventilation hole extends to the surface of the valve core and is disposed toward the valve cover.

Compared with the prior art, the cut-off valve of the present invention is provided with an accommodating cavity in the valve core to accommodate the piston rod and the piston arranged in the accommodating cavity, and at the same time a ventilation hole is communicated in the valve core, and the ventilation hole extends to the surface of the valve core , When the external water pressure is large, part of the water enters from the inlet of the accommodating cavity, and drives the piston to push the coil spring on the piston rod. When the piston blocks the air outlet on the valve core, the internal piston stops moving, which acts as a decompression. Damage to the valve core.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

In the figure: 1. Liquid inlet; 2. Liquid outlet; 3. Valve cover; 4. Valve stem; 5. Control chamber; 6. Sealing groove; 7. Valve core; 8. Receiving chamber; 9. Piston rod ; 10, piston; 11, coil spring; 12, ventilation hole; 13, stopper.

Detailed ways

Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new implementations. example.

A globe valve as shown in Figure 1, wherein the globe valve comprises a valve body, a valve cover 3 and a valve stem 4, the valve cover 3 is covered on the valve body, and the valve body body is provided with a liquid inlet 1 and a liquid outlet 2. There is a control cavity 5 inside the valve body, the two ends of the control cavity 5 are connected to the liquid inlet 1 and the liquid outlet 2, the valve rod 4 is inserted through the valve rod 4 and extends to the valve body, and the valve rod 4 is connected to the valve body The valve core 7 in the control chamber 5, the tail of the valve stem 4 is fixed with the valve core 7 through the bearing, wherein the valve stem 4 is fixed on the valve cover 3 by threaded engagement, the valve core 7 is close to the inner wall of the control chamber 5, and is in the rotary valve. When the rod 4 goes down, it drives the valve core 7 to move up and down on the control chamber 5, blocks the liquid inlet 1, controls the liquid inlet of the liquid inlet 1, and has the effect of blocking and sealing. Wherein, the end of the valve rod 4 is provided with a knob to facilitate the rotation of the valve rod 4 .

Further, a stopper 13 is provided on the inner wall of the control chamber 5 , the stopper 13 is used to limit the valve core 7 , and the stopper 13 is arranged at the lower part of the liquid inlet 1 , when the valve core 7 completely blocks the liquid inlet 1 , the valve core 7 rests on the stopper 13, and the stopper 13 plays a role in limiting the valve core 7, wherein, the inner wall of the control chamber 5 is provided with a sealing groove 6, and the sealing groove 6 is symmetrically arranged on the inner wall of the control chamber 5, and The number of pairs is set to play a sealing role to prevent seepage from entering the valve core 7 through the valve core 7 and the inner wall of the control cavity 5, which affects the sealing effect of the globe valve.

Further, in the case of high water pressure or when the liquid outlet pipe connected to the liquid outlet 2 is blocked, when the valve core 7 is blocked, the internal water pressure is high, and the large water pressure pushes the valve core 7 upward, causing The threaded connection between the valve stem 4 and the valve cover 3 is loose, resulting in sliding wire, which affects the service life. A accommodating cavity 8 is set on the valve core 7, wherein the accommodating cavity 8 is designed with a narrow inlet and a wider interior. A piston rod 9 is arranged in the axial direction, and a piston 10 is arranged at the end of the piston rod 9, wherein the piston 10 is close to the cavity wall of the accommodating cavity 8. Under the action of water pressure, the piston rod 9 will move toward the valve in the axial direction. The cover 3 moves in the direction, wherein, in order to realize the movement and buffering of the piston rod 9, a ventilation hole 12 is provided on the valve core 7, and a coil spring 11 is sleeved on the piston rod 9. The coil spring 11 plays a buffering role and can relieve the water pressure. , wherein, the vent hole 12 on the valve core 7 extends to the surface of the valve core 7, and is the surface facing the direction of the valve cover 3. When the piston 10 moves upward, the air in the accommodating cavity 8 is discharged from the vent hole, which is convenient for the piston rod 9. When the piston 10 blocks the ventilation port, the internal air cannot flow, and the piston rod 9 stops moving. When the water pressure is removed, the coil spring 11 drives the piston rod 9 to rebound. At the same time, the piston 10 leaves the ventilation port position, and the gas enters from the ventilation port. , to facilitate the downward movement of the piston 10.

Through the piston rod 9 and the piston 10 assembly in the accommodating cavity 8, the water pressure in the accommodating cavity 8 can be effectively removed, preventing the water pressure from damaging the valve core 7 and the valve stem 4, and ensuring the tightness of the globe valve.

The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited by this. Any insubstantial changes and replacements made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. The scope of protection of the present utility model.

Claims (5)

1. A globe valve, comprising a valve body, a valve stem and a valve cover, the valve body is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are connected to a control cavity in the valve body, and the valve cover is pressurized. The valve stem is mounted on the valve body, and the valve stem is inserted into the valve cover and extends into the control cavity of the valve body. The valve stem is fixed on the valve cover by threaded engagement. It lies in: the valve core and the tail of the valve stem are connected by a bearing, the valve core closely fits the control cavity, and the valve core moves up and down through the rotation of the valve stem, thereby blocking the liquid inlet, and the valve core is provided with a accommodating cavity. , the accommodating cavity is a cavity with a narrow inlet and a wide interior. A piston rod and a piston fixed at the end of the piston rod are arranged in the accommodating cavity along the axial direction. The piston is close to the inner wall of the accommodating cavity. An elastic part is sleeved on the rod. 2 . The globe valve according to claim 1 , wherein the elastic member sleeved on the piston rod is a coil spring. 3 . 3 . The shut-off valve according to claim 1 , wherein at least a pair of sealing grooves are symmetrically arranged on the inner wall of the control chamber, and the sealing grooves are filled with sealing members. 4 . 4 . The shut-off valve according to claim 1 , wherein a stopper is provided on the inner wall of the control cavity body, the stopper is arranged on the lower side of the liquid inlet, and a buffer pad is arranged on the surface of the stopper. 5 . 5 . The shut-off valve according to claim 1 , wherein the valve core body is provided with a ventilation hole, and the ventilation hole is connected to the end of the accommodating cavity, the ventilation hole extends to the surface of the valve core, and Set towards the bonnet.

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