CN210118465U - Forged steel stop valve - Google Patents

Abstract

The utility model discloses a forged steel stop valve relates to stop valve technical field, including the hand wheel, the lower extreme of hand wheel is provided with the valve rod, valve-stem nut is installed to the lower extreme of valve rod, valve-stem nut's lower extreme is provided with the valve body, the inboard of valve body is provided with the throttle passageway, the one end of throttle passageway is provided with the injection flange, and the other end of throttle passageway is provided with the output flange. The filter layer can filter impurity in the medium, thereby guarantee that the use of stop valve is not influenced, the filter layer can tentatively increase the resistance of medium simultaneously, thereby weaken the phenomenon of cavitation, first disk seat, the second disk seat, the thickness of disk seat component has been increased, make the disk seat hole increase, form longer throttle passage, the outside of valve clack is provided with resistant erosion layer and adopts the stellite alloy, can protect the valve clack under the state of opening and shutting, avoid long-time medium to erode, corrode, the damage valve clack, thereby the life of extension stop valve.

Description

Forged steel stop valve

Technical Field

The utility model relates to a stop valve technical field specifically is a forged steel stop valve.

Background

The forged steel stop valve is a valve with valve clack moving along the central line of valve seat, and according to the moving form of valve clack, the change of valve seat through hole is in direct proportional relation with valve clack stroke, and because the valve rod of said valve is relatively short in opening or closing stroke and has very reliable cutting function, and because the change of valve seat through hole is in direct proportional relation with valve clack stroke, it is very suitable for regulating flow rate, and can be used for closing or opening pipeline in pipeline system, and can make system normally run.

However, the stop valve on the market at present is easy to be eroded by media to damage the valve clack in a long-time opening and closing state, the traditional stop valve cannot well avoid cavitation erosion, and the traditional valve seat is too soft in material or is cold-deformed under load. Accordingly, one skilled in the art has provided a forged steel shut off valve that solves the problems set forth in the background above.

Disclosure of Invention

An object of the utility model is to provide a forged steel stop valve to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a forged steel stop valve, includes the hand wheel, the lower extreme of hand wheel is provided with the valve rod, valve-stem nut is installed to the lower extreme of valve rod, valve-stem nut's lower extreme is provided with the valve body, the inboard of valve body is provided with the throttle passageway, the one end of throttle passageway is provided with the injection flange, and the other end of throttle passageway is provided with the output flange, the filter screen is installed to the other end of throttle passageway, the inside middle-end of throttle passageway is provided with the disk seat component, the upper end of disk seat component is provided with the valve clack, the upper end of valve clack is provided with the filler, gland is installed in the outside of.

As a further aspect of the present invention: the upper end of the valve seat component is provided with a spring, the lower end of the spring is connected with a first valve seat layer, and the lower end of the first valve seat layer is provided with a second valve seat layer.

As a further aspect of the present invention: the lower end of the valve clack is provided with an erosion-resistant layer, and the upper end of the erosion-resistant layer is sleeved with a sealing ring.

As a further aspect of the present invention: the first valve seat layer is a hard alloy component, the second valve seat layer is a polytetrafluoroethylene component, the first valve seat layer and the second valve seat layer are fixedly connected, and the valve seat component is a stepped component.

As a further aspect of the present invention: the erosion resistant layer is a stellite alloy member, the seal ring is a polytetrafluoroethylene member, and the valve flap is a stainless steel member.

As a further aspect of the present invention: the output flange is communicated with the filter screen through a throttling channel, and the hand wheel is rotatably connected with the valve rod.

As a further aspect of the present invention: the valve body is a gray cast iron component, and the valve rod is a copper alloy component.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the throttling channel is preferably longer than a common stop valve, so that sudden expansion after flow-closed throttling can be delayed to transfer a damage position to keep the damage position away from a sealing surface; on the other hand, the throttling resistance is increased, the pressure recovery degree is reduced, the cavitation is weakened, and the design of the step type in the valve seat member hole is just for increasing the resistance and weakening the cavitation.

2. The filter layer of preferred, after using for a long time, impurity is piled up in the gap of valve rod and disk seat very easily to lead to this kind of stop valve not to have fine practicality at the in-process of in-service use, the filter layer can filter impurity in the medium, thereby guarantees that the use of stop valve is not influenced, and the filter layer can tentatively increase the resistance of medium simultaneously, thereby weakens the phenomenon of cavitation.

3. The valve seat component is increased in thickness due to the arrangement of the first valve seat and the second valve seat which are optimized, the valve seat hole is increased, a longer throttling channel is formed, the erosion-resistant layer is arranged on the outer side of the valve clack and made of stellite alloy, the valve clack can be protected in an opening and closing state, long-time medium erosion and corrosion are avoided, and the valve clack is damaged, so that the service life of the stop valve is prolonged.

4. The first valve seat layer is made of hard alloy materials, cold deformation or permanent deformation can be eliminated, the pushing force of the spring is used for obtaining air bubble tight sealing, the valve seat is compressed to generate sealing stress, the material is elastically deformed and is extruded into the rough surface of a matched metal part, and therefore all leakage passages are blocked.

Drawings

FIG. 1 is a schematic structural view of a forged steel shut-off valve;

FIG. 2 is a schematic view of the internal structure of a forged steel shut-off valve;

FIG. 3 is a schematic diagram of the structure of a valve seat member in a forged steel shut-off valve.

In the figure: 1. a hand wheel; 2. a valve stem; 3. a valve body; 4. a valve stem nut; 5. a filler; 6. a valve seat member; 7. a packing gland; 8. a valve cover; 9. a valve flap; 10. injecting a flange; 11. an output flange; 12. a filter screen; 13. a throttling channel; 601. a first valve seat layer; 602. a second valve seat layer; 603. a spring; 901. an erosion resistant layer; 902. and (5) sealing rings.

Detailed Description

Referring to fig. 1 to 3, in an embodiment of the present invention, a forged steel stop valve includes a hand wheel 1, a valve stem 2 is disposed at a lower end of the hand wheel 1, a stem nut 4 is disposed at a lower end of the valve stem 2, a valve body 3 is disposed at a lower end of the stem nut 4, a throttle passage 13 is disposed inside the valve body 3, an injection flange 10 is disposed at one end of the throttle passage 13, an output flange 11 is disposed at the other end of the throttle passage 13, a filter screen 12 is disposed at the other end of the throttle passage 13, a valve seat member 6 is disposed at a middle end inside the throttle passage 13, a valve flap 9 is disposed at an upper end of the valve flap 9, a packing gland 7 is disposed at an outer side of the packing 5, a valve cover 8 is disposed at a lower end of the packing gland 7, the throttle passage 13 is longer than a common stop valve, on one hand, after, the function of keeping it away from the sealing surface; on the other hand, the throttling resistance has been increased again, the recovery degree of pressure has been reduced, make the cavitation weaken, 6 downthehole step formulas of designing into of disk seat member are exactly for increasing the resistance, weaken the cavitation, after using for a long time, impurity is piled up in the gap of valve rod and disk seat very easily, thereby lead to this kind of stop valve not to have fine practicality at the in-process of in-service use, filter screen 12 can filter impurity in the medium, thereby guarantee that the use of stop valve is not influenced, filter screen 12 can tentatively increase the resistance of medium simultaneously, thereby weaken the phenomenon of cavitation.

The upper end of the valve seat member 6 is provided with a spring 603, the lower end of the spring 603 is connected with a first valve seat layer 601, the lower end of the first valve seat layer 601 is provided with a second valve seat layer 602, the lower end of the valve flap 9 is provided with an erosion-resistant layer 901, the outer side of the erosion-resistant layer 901 is sleeved with a sealing ring 902, the first valve seat layer 601 is a hard alloy member and can eliminate cold deformation or permanent deformation, the thrust of the spring 603 is used for obtaining bubble tightness sealing, and the compression valve seat generates sealing stress to enable the material to elastically deform and extrude into the rough surface of a matched metal part so as to block all leakage passages.

The valve seat comprises a first valve seat layer 601, a second valve seat layer 602, a valve seat member 6, an erosion-resistant layer 901, a sealing ring 902, a valve flap 9, a valve seat member 9, a valve body 3, a valve rod 2, a valve body 601, a valve seat layer 602, a throttling channel 13, a valve seat hole 13, a throttling channel 13, an erosion-resistant layer 901, a stellite alloy, a sealing ring 902, a valve clack 9, a valve seat 9 and a valve seat cover, wherein the first valve seat layer 601, the second valve seat layer 602 are arranged in a double-layer mode, the thickness of the valve seat member 6 is increased, the valve seat hole is increased, the throttling channel 13 is longer, the erosion-resistant layer 901 is arranged on the outer side of the valve flap 9, the valve flap 9 can be protected in an opening and closing state, long-time medium erosion is avoided, The valve clack 9 is corroded and damaged, so that the service life of the stop valve is prolonged.

The utility model discloses a theory of operation is: the medium is injected into the flange 10 from the beginning, impurity in the medium can be filtered through the filter screen 12, thereby ensuring that the use of the stop valve is not influenced, meanwhile, the filter screen 12 can primarily increase the resistance of the medium, thereby weakening the phenomenon of cavitation, the entering throttling channel 13 is longer than the common stop valve, increasing the throttling resistance, reducing the recovery degree of pressure, and weakening the cavitation, the step type is designed in the hole of the valve seat component 6 to increase the resistance, the first valve seat layer 601 and the second valve seat layer 602 increase the thickness of the valve seat component 6, the erosion resistant layer 901 arranged on the outer side of the valve flap 9 adopts stellite alloy, the valve flap 9 can be protected in an opening and closing state, long-time medium scouring and corrosion are avoided, thereby prolonging the service life of the stop valve, the first valve seat layer 601 is a hard alloy component, cold deformation or permanent deformation can be eliminated, the thrust of the spring 603 is used for obtaining tight sealing of bubbles, the compression of the valve seat creates a sealing stress that elastically deforms the material into the rough surface of the mating metal part to block all leakage paths, thereby extending the useful life of the shut-off valve.

The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (7)

1. The forged steel stop valve comprises a hand wheel (1) and is characterized in that a valve rod (2) is arranged at the lower end of the hand wheel (1), a valve rod nut (4) is installed at the lower end of the valve rod (2), a valve body (3) is arranged at the lower end of the valve rod nut (4), a throttling channel (13) is arranged on the inner side of the valve body (3), an injection flange (10) is arranged at one end of the throttling channel (13), an output flange (11) is arranged at the other end of the throttling channel (13), a filter screen (12) is installed at the other end of the throttling channel (13), a valve seat member (6) is arranged at the middle end in the throttling channel (13), a valve clack (9) is arranged at the upper end of the valve seat member (6), packing (5) is arranged at the upper end of the valve clack (9), and a packing, and the lower end of the packing gland (7) is provided with a valve cover (8).

2. A forged steel stop valve according to claim 1, wherein the upper end of said seat member (6) is provided with a spring (603), the lower end of said spring (603) is connected with a first seat layer (601), and the lower end of said first seat layer (601) is provided with a second seat layer (602).

3. The forged steel stop valve according to claim 1, wherein the lower end of the valve flap (9) is provided with an erosion-resistant layer (901), and the upper end of the erosion-resistant layer (901) is sleeved with a sealing ring (902).

4. A forged steel stop valve according to claim 2, wherein said first valve seat layer (601) is a hard alloy material member, said second valve seat layer (602) is a teflon material member, said first valve seat layer (601) and said second valve seat layer (602) are fixedly connected, and said valve seat member (6) is a stepped member.

5. A forged steel shut-off valve according to claim 3, wherein said erosion resistant layer (901) is a stellite material, said seal ring (902) is a teflon material, and said valve flap (9) is a stainless steel material.

6. The forged steel stop valve according to claim 1, wherein the output flange (11) is connected with the filter screen (12) through a throttling channel (13), and the hand wheel (1) is rotatably connected with the valve rod (2).

7. A forged steel stop valve according to claim 1, wherein said valve body (3) is a member of gray cast iron and said valve stem (2) is a member of copper alloy.