CN206320324U - A kind of high pressure line gate valve with pressure relief device - Google Patents

Abstract

The utility model discloses a high-pressure pipeline gate valve with a pressure relief device. The gate valve comprises: a valve body, a valve seat, a valve cover, a gate plate and a valve stem; the gate plate is arranged in the valve body; one end of the valve stem It is connected with the gate, and the other end passes through the valve cover; a pressure relief hole is opened in the outlet direction of the gate; an external bypass pressure relief valve is installed in the middle cavity of the valve body; the valve stem The self-sealing structure in the middle of the outer wall of the valve body and the inner wall of the shaft hole of the valve body is a double seal ring structure; the double seal ring structure includes a stainless steel elastic hard seal ring and a flexible graphite soft seal ring or a flexible graphite braided packing arranged in sequence along the axis of the shaft hole A soft sealing ring; a packing cover plate is arranged above the double sealing ring structure; an upper sealing seat is arranged below the double sealing ring structure, and a packing spacer is arranged between the upper sealing seat and the soft sealing ring.

Description

A high-pressure pipeline gate valve with a pressure relief device

technical field

The utility model relates to the field of valves, in particular to a high-pressure pipeline gate valve with a pressure relief device.

Background technique

The pipeline gate valve is mainly suitable for oil, water, gas and other pipelines to cut off or connect the pipeline medium, and has good sealing performance. But precisely because of its excellent two-way sealing performance, when the high-temperature, high-pressure or low-temperature medium is closed in the middle cavity, if the temperature of the middle cavity continues to rise and the medium expands to the point that the middle cavity cannot bear it, there will be a huge safety hazard, ranging from If the valve is seized and cannot be opened and closed, it will cause damage to the valve, have a huge impact on the entire system, and even cause harm to the entire production process, bringing hidden dangers to life and property. Therefore, it is necessary to develop a high-pressure gate valve with a pressure relief device to solve the harm caused by the abnormal boost in the middle cavity. In addition, the self-sealing ring of the traditional pipeline gate valve has a single seal, which has certain hidden dangers.

Utility model content

The purpose of the utility model is to provide a high-pressure pipeline gate valve with a pressure relief device.

To achieve the above object, the utility model adopts the following content:

A high-pressure pipeline gate valve with a pressure relief device, the gate valve includes: a valve body, a valve seat, a valve cover, a gate and a valve stem; the gate is arranged in the valve body; one end of the valve stem is connected to the gate, The other end passes through the valve cover; a pressure relief hole is opened in the outlet direction of the gate; an external bypass pressure relief valve is installed in the middle cavity of the valve body; the outer wall of the valve stem and the valve body The self-sealing structure in the middle of the inner wall of the shaft hole is a double sealing ring structure; the double sealing ring structure includes a stainless steel elastic hard sealing ring and a flexible graphite soft sealing ring or a flexible graphite braided packing soft sealing ring arranged in sequence along the axis of the shaft hole; A packing cover plate is arranged above the double sealing ring structure; an upper sealing seat is arranged below the double sealing ring structure, and a packing spacer ring is arranged between the upper sealing seat and the soft sealing ring.

Further, the shutter has two sealing surfaces, and an elastic groove is provided between the two sealing surfaces. The elastic groove gate structure can improve the sealing performance and prolong the service life.

Further, the gate valve further includes: a hand wheel, which is fixed to the valve stem via a valve stem nut.

The utility model has the following advantages:

1. In the gate valve of the present utility model, a pressure relief hole is added in the direction of the outlet of the gate plate, and the pressure increase caused by the expansion of the medium in the middle cavity is transferred to the downstream pipeline of the valve to dilute the adverse effects caused by abnormal pressure increase; Install an external bypass pressure relief valve to balance the pressure in the middle chamber.

2. The high-pressure pipeline gate valve of this utility model improves the self-sealing ring of the traditional central self-sealing structure into a double-sealing structure composed of a soft sealing ring and an elastic hard sealing ring, and the bottom is pressed with flexible graphite or flexible graphite woven packing. The soft sealing ring is made of stainless steel as an elastic hard sealing ring, which simultaneously possesses the structural advantages of the existing wedge-shaped sealing ring and can make up for the shortcomings of the existing sealing structure.

3. The high-pressure pipeline gate valve of the utility model has reasonable design, advanced technology, reliable performance, high sealing performance and long service life.

4. The high-pressure pipeline gate valve of the present utility model can be applied to industries such as boilers, offshore oil drilling platforms, petrochemicals, smelting, coal industry and natural gas, and may be used in various pipeline systems of thermal power stations, and can withstand high temperature environments of 630°C .

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 is a structural schematic diagram of a high-pressure pipeline gate valve with a pressure relief device of the present invention.

detailed description

In order to illustrate the utility model more clearly, the utility model will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present utility model.

Example

As shown in FIG. 1 , it is a structural schematic diagram of a high-pressure pipeline gate valve with a pressure relief device of the present invention. The high-pressure pipeline gate valve with a pressure relief device includes: a valve body 1, a valve seat 2, a valve cover 7, a gate plate 3, a valve stem 4, and a handle 13. The valve cover 7 and the valve body 1 are fixed by bolts, nuts 5 and gaskets 6 . The gate 3 is arranged in the valve body 1 and has two sealing surfaces, and an elastic groove 16 is arranged between the two sealing surfaces. One end of the valve rod 4 is connected with the gate 3 , and the other end passes through the valve cover 7 . The hand wheel 13 is fixed with the valve stem 4 through the valve stem nut 12 . An external bypass pressure relief valve 14 is installed in the middle cavity of the valve body 1 . A pressure relief hole 15 is opened in the outlet direction of the flashboard 3 . The self-sealing structure in the middle of the outer wall of the valve stem 4 and the inner wall of the shaft hole of the valve body 1 is a double seal ring structure 10, including stainless steel elastic hard seal rings and flexible graphite soft seal rings or flexible graphite braided packing soft seals arranged in sequence along the axis of the shaft hole. sealing ring. A packing cover plate 11 is arranged above the double sealing ring structure 10 , an upper sealing seat 8 is arranged below the double sealing ring structure, and a packing spacer ring 9 is arranged between the upper sealing seat 8 and the double sealing ring structure 10 .

The operating temperature range of the high-pressure pipeline gate valve of the utility model is (-29)°C-570°C, the leakage level meets the requirements of "ISO 5208-2008" Class A, zero leakage, and the nominal pressure covers PN16-PN420, CLASS 150-CLASS 2500, Wide range of applications. Butt weld connections are available.

Apparently, the above-mentioned embodiments of the utility model are only examples for clearly illustrating the utility model, rather than limiting the implementation of the utility model. For those of ordinary skill in the art, on the basis of the above description It is also possible to make other changes or changes in different forms, and all implementation modes cannot be exhausted here, and all obvious changes or changes that belong to the technical solutions of the present utility model are still within the scope of protection of the present utility model .

Claims (3)

1. a kind of high pressure line gate valve with pressure relief device, it is characterised in that the gate valve includes：Valve body, valve seat, bonnet, lock Plate and valve rod；The flashboard is arranged in valve body；One end of the valve rod is connected with flashboard, and the other end passes through bonnet；Described Pressure relief vent is offered on the Way out of flashboard；Outer bypass relief valve is added in the lumen position of the valve body；The valve rod Outer wall and valve body shaft hole inner wall middle part self sealing structure be Double seal ring structure；The Double seal ring structure is included along axle The stainless steel elastic hard sealing circle and soft graphite soft seal circle or soft graphite braided packing that axially bored line is set gradually are soft close Seal；The top of the Double seal ring structure sets filler cover plate；The lower section of the Double seal ring structure sets upper seal support, on Filler spacer ring is set between seal receptacle and soft seal circle.

2. a kind of high pressure line gate valve with pressure relief device according to claim 1, it is characterised in that the flashboard has Elastic groove is provided between two sealing surfaces, and two sealing surfaces.

3. a kind of high pressure line gate valve with pressure relief device according to claim 1, it is characterised in that the gate valve is also wrapped Include：Handwheel, setting is mutually fixed with valve rod through valve stem nut.