Stop valve without valve cover

Abstract

The utility model discloses a non-bonnet type stop valve, which comprises a valve body and a valve rod, the valve body is provided with a stop flow channel, the end part of the valve body is provided with a sealing hole communicated with the stop flow channel, the tail end of the valve rod penetrates into the stop flow channel through the sealing hole and is provided with a valve plate, a filler sleeve is connected between the valve rod and the sealing hole, and the valve plate is provided with a valve cover. A penetrating hole is formed in the packing sleeve, the valve rod is arranged in the penetrating hole in a sliding mode, the outer circumferential wall of the packing sleeve and the inner circumferential wall of the sealing hole are connected through a seal welding process, and a sealing piece used for sealing the penetrating hole is arranged between the inner circumferential wall of the penetrating hole and the outer circumferential wall of the valve rod. The stop valve solves the problem of external leakage between the valve cover and the valve body of a conventional stop valve in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a valve coverless stop valve. Background Art

[0002] The stop valve is a commonly used type of valve, and its working principle is based on the linear motion of the valve disc to control the on and off of the fluid. At present, the stop valve includes a valve body, a valve cover and a valve stem. A valve plate is arranged at the bottom of the valve stem, and a stop flow channel is opened in the valve body. The stop flow channel is composed of a feed channel and a discharge channel. The feed channel and the discharge channel are connected through a transition hole. When the valve stem moves downward to drive the valve plate to move synchronously, the valve plate gradually approaches the transition hole. At this time, the gap between the valve plate and the transition hole gradually decreases until the valve plate completely closes the transition hole, thereby achieving complete closure of the stop flow channel, thereby preventing the passage of the fluid. When the valve plate moves upward, the valve plate gradually separates from the transition hole and the gap between the valve plate and the transition hole gradually increases, thereby achieving the opening of the transition hole, thereby allowing the fluid to pass; by adjusting the upper and lower positions of the valve disc, the precise control of the fluid flow rate can be achieved. In the prior art, the valve body and the valve cover are connected by bolts. When the valve body is used for a long time, the bolts will become loose due to the influence of temperature, or the sealing surface between the valve cover and the valve body will fail, thereby causing liquid leakage and affecting the use of the stop valve. However, the prior art lacks a bonnetless stop valve to avoid the problem of liquid leakage between the bonnet and the valve body. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a bonnetless stop valve to solve the problem of external leakage between the bonnet and the valve body of the conventional stop valve in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides a bonnetless stop valve, including a valve body and a valve stem, the valve body is provided with a stop flow channel, the end of the valve body is provided with a sealing hole connected to the stop flow channel, the end of the valve stem penetrates into the stop flow channel through the sealing hole and is provided with a valve plate, a stuffing sleeve is connected between the valve stem and the sealing hole, the stuffing sleeve is provided with a through hole, the valve stem is slidably arranged in the through hole, the outer peripheral wall of the stuffing sleeve and the inner peripheral wall of the sealing hole are connected and arranged by a sealing welding process, and a sealing member for sealing the through hole is provided between the inner peripheral wall of the through hole and the outer peripheral wall of the valve stem.

[0005] The advantages of adopting the above technical scheme are as follows: when assembling the valve body and the valve stem, the valve stem is inserted into the shut-off flow channel through the sealing hole and the position of the valve stem is adjusted so that the valve plate can cooperate with the shut-off flow channel. Then the operator sets the stuffing sleeve on the valve stem and moves the stuffing sleeve downward so that the stuffing sleeve is located at the sealing hole. Then the operator connects the inner circumferential wall of the sealing hole and the outer circumferential wall of the stuffing sleeve through a sealing welding process to achieve the sealing between the sealing hole and the stuffing sleeve. Then the perforation is sealed by a sealing member to achieve the sealing between the valve body and the valve stem. The sealing welding process between the sealing hole and the stuffing sleeve improves the sealing performance of both. The sealing strength between them is improved, and the sealing member is provided to achieve the sealing cooperation between the stuffing sleeve and the valve stem. The above-mentioned technical setting avoids the liquid overflow between the stuffing sleeve and the sealing hole. At the same time, compared with the prior art in which the bolts become loose due to the influence of temperature, resulting in a gap between the valve cover and the valve body, the present technology does not provide a valve cover, thereby reducing the cost expenditure and avoiding the gap between the valve cover and the valve body to cause liquid overflow. At the same time, compared with the bolt connection method in the prior art, the present technology further improves the sealing through sealing welding processing, thereby avoiding liquid overflow.

[0006] The utility model is further provided that: a bushing is connected between the inner peripheral wall of the through hole and the outer peripheral wall of the valve stem, and the outer peripheral wall of the bushing is expansion-fitted with the inner peripheral wall of the through hole.

[0007] The advantages of adopting the above technical solution are: the expansion fit of the bushing supports the valve stem, thereby preventing the valve stem from deviating from its position and thus restricting the valve stem.

[0008] The utility model further provides that: the sealing element comprises a matching sleeve sleeved on the valve stem, the outer peripheral wall of the matching sleeve is threadedly connected with the inner peripheral wall of the through hole, and the bushing is coaxially aligned with the matching sleeve.

[0009] The benefits of adopting the above technical solution are: in the above technology, the matching sleeve is connected to the perforation thread, so that the matching sleeve can be quickly installed into the perforation and initially close the perforation, thereby preventing foreign matter from invading the perforation or liquid from overflowing from the perforation. At the same time, the sleeve and the matching sleeve are coaxially aligned, so that the sleeve and the matching sleeve cooperate to achieve multiple sealing of the perforation.

[0010] The utility model is further provided with: a sealing gap is formed between the inner peripheral wall of the perforation and the outer peripheral wall of the valve stem, the sealing gap is located between the bushing and the matching sleeve, and the sealing gap, the bushing and the matching sleeve are combined to form a sealing cavity, and the sealing member also includes a sealing filler, and the sealing filler is arranged to fill the sealing cavity.

[0011] The benefits of adopting the above technical solution are: the sealing filler in the above technology fills the sealing cavity, so that the sealing cavity is sealed by the sealing filler, thereby improving the sealing strength between the perforation and the valve stem, and further avoiding liquid overflow or external impurities from intruding. The sealing filler in the above technology can select graphite sealing filler according to the sealing requirements and assembly requirements, so as to achieve the filling of the sealing cavity.

[0012] The utility model is further provided with: a pressure ring is arranged between the matching sleeve and the sealing packing, the pressure ring sleeve is arranged on the valve stem, the top wall of the pressure ring is arranged in abutment with the bottom wall of the matching sleeve, and the bottom wall of the pressure ring is arranged in abutment with the top wall of the sealing packing.

[0013] The benefits of adopting the above technical solution are: in the above technology, a pressure ring is arranged between the matching sleeve and the sealing packing. After the sealing packing is installed into the sealing cavity, the operator inserts the matching sleeve so that the matching sleeve cooperates with the through-hole thread. At this time, the operator continues to screw in the matching sleeve so that the matching sleeve is pressed down and drives the pressure ring to be pressed down synchronously. At this time, the pressure ring is pressed down by the matching sleeve and squeezes the sealing packing, so that the sealing packing is compressed and respectively expands and cooperates with the inner circumferential wall of the through-hole and the outer circumferential wall of the valve stem, thereby realizing the sealing of the sealing cavity and improving the sealing strength.

[0014] The utility model is further provided that: the outer peripheral wall of the pressure ring and the inner peripheral wall of the perforation are arranged in an expansion fit.

[0015] The benefit of adopting the above technical solution is that: in the above technology, the outer peripheral wall of the pressure ring and the inner peripheral wall of the perforation are arranged in an expansion fit, thereby improving the sealing strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0017] The utility model provides a bonnetless stop valve, comprising a valve body 1 and a valve stem 11, wherein the valve body 1 is provided with a stop flow channel 12, a sealing hole 13 communicating with the stop flow channel 12 is provided at the end of the valve body 1, the end of the valve stem 11 penetrates into the stop flow channel 12 through the sealing hole 13 and is provided with a valve plate 111, a stuffing sleeve 2 is connected between the valve stem 11 and the sealing hole 13, a through hole 21 is provided on the stuffing sleeve 2, the valve stem 11 is slidably arranged in the through hole 21, the outer peripheral wall of the stuffing sleeve 2 and the inner peripheral wall of the sealing hole 13 are connected and arranged by a sealing welding process, a sealing member for sealing the through hole 21 is arranged between the inner peripheral wall of the through hole 21 and the outer peripheral wall of the valve stem 11, a bushing 3 is connected between the inner peripheral wall of the through hole 21 and the outer peripheral wall of the valve stem 11, the outer peripheral wall of the bushing 3 and the inner peripheral wall of the through hole 21 are arranged in an expansion fit, The sealing component includes a matching sleeve 4 sleeved on the valve stem 11, the outer peripheral wall of the matching sleeve 4 is threadedly connected to the inner peripheral wall of the through hole 21, the bushing 3 and the matching sleeve 4 are coaxially aligned, a sealing gap is formed between the inner peripheral wall of the through hole 21 and the outer peripheral wall of the valve stem 11, the sealing gap is located between the bushing 3 and the matching sleeve 4, and the sealing gap is combined with the bushing 3 and the matching sleeve 4 to form a sealing cavity 31, the sealing component also includes a sealing packing 5, the sealing packing 5 is filled in the sealing cavity 31, a pressing ring 41 is arranged between the matching sleeve 4 and the packing, the pressing ring 41 is sleeved on the valve stem 11, the top wall of the pressing ring 41 is abutted and matched with the bottom wall of the matching sleeve 4, the bottom wall of the pressing ring 41 is abutted and matched with the top wall of the sealing packing 5, and the outer peripheral wall of the pressing ring 41 is expansion-fitted with the inner peripheral wall of the through hole 21.

[0018] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A bonnetless stop valve, comprising a valve body and a valve stem, wherein the valve body is provided with a stop flow channel, the end of the valve body is provided with a sealing hole communicating with the stop flow channel, the end of the valve stem penetrates into the stop flow channel through the sealing hole and is provided with a valve plate, characterized in that: A stuffing sleeve is connected between the valve stem and the sealing hole, a through hole is opened on the stuffing sleeve, the valve stem is slidably arranged in the through hole, the outer peripheral wall of the stuffing sleeve and the inner peripheral wall of the sealing hole are connected and arranged by a sealing welding process, and a sealing member for sealing the through hole is arranged between the inner peripheral wall of the through hole and the outer peripheral wall of the valve stem.

2. A bonnetless stop valve according to claim 1, characterized in that: A bushing is connected between the inner peripheral wall of the through hole and the outer peripheral wall of the valve stem, and the outer peripheral wall of the bushing is expansion-fitted with the inner peripheral wall of the through hole.

3. A bonnetless stop valve according to claim 2, characterized in that: The sealing member comprises a matching sleeve sleeved on the valve stem, the outer peripheral wall of the matching sleeve is threadedly connected with the inner peripheral wall of the through hole, and the bushing is coaxially aligned with the matching sleeve.

4. A bonnetless stop valve according to claim 3, characterized in that: A sealing gap is formed between the inner peripheral wall of the perforation and the outer peripheral wall of the valve stem. The sealing gap is located between the bushing and the matching sleeve and the sealing gap, the bushing and the matching sleeve are combined to form a sealing cavity. The sealing member also includes a sealing filler, which is arranged to fill the sealing cavity.

5. The bonnetless stop valve according to claim 4, characterized in that: A pressure ring is arranged between the matching sleeve and the sealing packing, the pressure ring sleeve is arranged on the valve stem, the top wall of the pressure ring is arranged in abutment with the bottom wall of the matching sleeve, and the bottom wall of the pressure ring is arranged in abutment with the top wall of the sealing packing.

6. The bonnetless stop valve according to claim 5, characterized in that: The outer peripheral wall of the pressure ring is arranged in an expansion fit with the inner peripheral wall of the perforation.

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