CN110848429A - A shut-off dual-purpose valve - Google Patents

Abstract

The invention improves the valve clack on the original stop valve, lengthens the vertical height of the valve clack, the height value is larger than the distance from closing to full opening of the valve clack, when the valve is at the full opening position, the valve clack can move freely under the action of medium in the distance, when the inlet of the valve has pressure, the valve clack is lifted until the valve is fully opened; when the inlet pressure is zero, the valve flap drops onto the valve body sealing surface to close. The invention has multiple functions, reduces the installation space, saves the cost, can reduce the pressure loss on a pipeline system, and can perform forced sealing when the medium backflow valve cannot check and has leakage.

Description

A shut-off dual-purpose valve

technical field

The invention relates to the field of valves, in particular to a shut-off dual-purpose valve.

Background technique

At present, in the market, it is difficult to find a valve that can be used as both a cut-off and a non-return valve, and the pipeline system is usually installed with a shut-off valve and a non-return valve at the same time. 1. Globe valve is composed of valve body, valve cover, valve disc, valve stem and other parts, its main function is to cut off and connect the pipeline medium; 2. Check valve, also known as reverse valve, consists of valve body, valve cover, valve It is mainly used on pipelines where the medium flows in one direction to prevent the backflow of the medium in the pipeline. The above two kinds of valves are widely used in pipelines of all walks of life because of their simple structure, but there are the following problems:

1. The globe valve and the check valve are usually straight-through structures, so the flow resistance coefficient is large. The installation of the two valves in series on the pipeline increases the head loss, increases the energy consumption, and is not conducive to energy conservation and emission reduction.

2. Considering the cost, two kinds of valves are installed on the pipeline at the same time, which increases the economic burden of the user.

3. In terms of installation and maintenance, the simultaneous use of the two valves in the pipeline system requires larger installation space and increased maintenance costs.

4. The check valve is an automatic valve. Its opening and closing action is driven by the energy of the medium itself. The greater the pressure of the medium backflow, the better the sealing performance. If the medium backflow pressure is too small, the valve may leak and check. The valve has no effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems, one valve can be used for multiple purposes, which not only reduces the installation space and saves the cost, but also reduces the pressure loss on the pipeline system. When the medium return valve cannot be checked and leaks occur, it can also be forced to seal.

In order to realize above-mentioned performance and characteristic, technical scheme of the present invention is:

A shut-off dual-purpose valve, comprising a valve cover, a valve body, a valve stem and a valve disc, the valve body is a three-way structure, the valve cover is arranged on the upper end of the valve body, and the valve cover connects the upper end of the valve body The opening is closed, the two ends of the valve body are respectively provided with a fluid inlet channel and a fluid outlet channel, both the inlet channel and the outlet channel are in communication with the upper end of the valve body, and the valve flap is arranged on the upper end of the valve body. inside the mouth and block the inlet and outlet passages when the valve is closed.

Compared with the prior art, the advantages of the present invention are:

1. In the pipeline system, a globe valve and a check valve are usually installed at the same time. The present invention designs a valve that can be used as both a cut off and a check valve.

2. This shut-off dual-purpose valve can be used for multiple purposes, which not only reduces the installation space, saves costs, but also reduces the pressure loss on the pipeline system. When the medium return valve cannot be checked and leaks occur, it can also be forced to seal.

3. The two functions of the valve are integrated into one, which is convenient for installation and maintenance, and reduces the installation space. Description of drawings

Fig. 1 is the structural diagram of the embodiment of the present invention in the closed state of the cut-off dual-purpose valve;

Fig. 2 is the structural diagram of the embodiment of the present invention under the fully open state of the cut-off dual-purpose valve;

Fig. 3 is the structural diagram of the embodiment of the present invention in the check state of the cut-off dual-purpose valve;

Reference numerals: 1-nut, 2-spring washer, 3-handwheel, 4-stem, 5-screw, 6-stem nut, 7-bracket, 8-nut, 9-packing gland, 10-live Section bolt, 11-pin, 12-packing, 13-nut, 14-stud, 15-washer, 16-valve cover, 17-valve, 18-valve body, 19-bonnet.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

The present invention relates to a valve which is used in chemical industry, water conservancy, smelting, electric power and other industries and can be used in water supply and drainage, natural gas, steam, petroleum, chemical fluid and other transmission and distribution systems. Its function can not only be used to cut off and connect pipelines medium, and can also prevent the backflow of the medium. Its working state is fully open or fully closed. It can only be installed horizontally on the pipeline, that is, the handwheel 3 is facing upwards.

As shown in FIGS. 1 to 3 , a dual-purpose shut-off valve includes a valve cover 19 , a valve body 18 , a valve stem 4 and a valve disc 17 , the valve body 18 is a three-way structure, and the valve cover 19 is arranged on the valve body 18 . On the upper end, the valve cover 19 closes the upper end of the valve body 18, and the two ends of the valve body 18 are respectively provided with a fluid inlet channel and a fluid outlet channel, and both the inlet channel and the outlet channel are in communication with the upper end of the valve body 18. The flap 17 is arranged in the upper opening of the valve body 18, and blocks the inlet channel and the outlet channel when the valve is closed. The upper end of the valve flap 17 is provided with a valve flap cover 16, which is fixedly connected with the valve flap 17, and the valve stem is 4. Passing through the valve cover 19 and the valve flap cover 16, the lower end of the valve stem 4 is provided with a step to prevent the valve stem 4 from falling off the valve flap cover 16; The upper end is pressed by the packing gland 9, the side of the valve cover 19 is provided with a bracket 7, one end of the bracket 7 is fixed on the valve cover 19, the other end is sleeved on the valve stem 4 through the valve stem nut 6, the bracket 7 and the valve stem The nut 6 is connected by the screw 5, and the valve stem nut 6 is threadedly connected with the valve stem 4 to realize the up and down linear movement of the valve stem 4 relative to the valve body 18; the upper end of the valve disc 17 is a hollow body structure, and the lower bottom end is a solid sealing surface, which The sealing surface of the valve body 18 forms a sealing pair; the valve supports and positions the valve stem 4 through the bracket 7, so that the valve operates more stably and reliably. The valve stem nut 6 is made of copper alloy, which can improve wear resistance and service life when matched with the valve stem 4 . The upper end of the valve stem 4 is provided with a hand wheel 3, the upper end of the valve stem 4 is conical with four sides, the middle part of the hand wheel 3 is provided with a hole that matches the conical four sides of the upper end of the valve stem 4, the top of the valve stem 4 is provided with a threaded rod, the threaded rod There is a nut 1 on it, and a spring washer 2 is arranged between the nut 1 and the handwheel 3. The nut 1 and the spring washer 2 are used to prevent the handwheel 3 from loosening and falling off at the position of the valve stem 4. Rotating the handwheel 3 drives the valve stem 4 produce axial displacement. The packing gland 9 and the valve cover 19 are connected by the joint bolt 10, one end of the joint bolt 10 is connected by the pin 11, the other end is connected by the nut 8, the valve cover 19 and the valve body 18 are fixedly connected by the stud 14, and the nut 13 Press down, and the use of joint bolts 10 is more convenient to realize the disassembly and assembly of the valve.

The valve cover 19 and the valve body 18 are made of cast steel, and the valve disc 17 is made of forged steel. The contact surface of the valve disc 17 and the valve body 18 is surfacing with corrosion-resistant, high-strength, and high-wear-resistant metals such as stainless steel or cemented carbide. Even after the valve is used for a long time, the welding part of the sealing surface can ensure that the valve disc 17 and For the sealing performance of the valve body 18 , a gasket 15 is provided on the contact surface of the valve cover 19 and the valve body 18 to prevent the medium from leaking out between the valve cover 19 and the valve body 18 .

In the normal flow state of the pipeline system, if the fluid needs to be cut off, rotate the handwheel 3 clockwise to drive the valve stem 4 and the valve disc 17 to move downward until the sealing surface of the valve disc 17 and the sealing surface of the valve body 18 are fitted to form a forced seal , as shown in Figure 1, the valve is closed at this time, and the pipeline system stops running. When the fluid in the pipeline needs to be connected and the valve needs to be opened, rotate the handwheel 3 counterclockwise, and the valve stem 4 will move up and axially along with the counterclockwise rotation until the handwheel 3 does not rotate. At this time, the valve stem 4 The lower large-diameter part pushes against the edge of the inner hole of the valve cover 19, and at the same time, under the thrust of the valve inlet medium, the valve disc 17 moves upward in a straight line until the bottom end of the inner hole of the valve disc 17 reaches the lower end head of the valve stem 4. When the valve is fully open, as shown in Figure 2, this process completes the function of forced opening and closing of the shut-off valve; when the pump needs to be stopped or the power is suddenly cut off in an accident, the pressure in the pipeline system is instantaneously zero, and the valve disc 17 is in itself. Under the action of gravity, it falls vertically until the sealing surface is attached to the sealing surface of the valve body 18, the medium begins to flow back, and the medium pressure acts on the upper surface of the valve disc 17, and finally forms a water return seal, as shown in Figure 3, when When the water pump starts again, the valve disc 17 moves upward and axially under the thrust of the medium until it is fully opened, which completes the function of the check valve to open and close according to the power of the medium itself; when the medium return pressure is small, the valve disc The sealing pair between 17 and the valve body 18 does not form a sufficient sealing specific pressure, which may cause leakage. At this time, the handwheel 3 can be rotated clockwise to drive the valve stem 4 to move axially downward until the head of the valve stem 4 transmits force. On the valve disc 17, a forced seal is formed, which is a function that cannot be achieved by a general check valve. Therefore, the present invention can not only meet the function of the stop valve but also achieve the function of the check valve, so that one valve can be used for two purposes, which reduces the use of pipeline components, reduces the water head loss, and is more conducive to pipeline maintenance and reduction of external leakage points.

Claims (5)

1. The utility model provides a by double-purpose valve, includes valve gap, valve body, valve rod and valve clack, the valve body is three way type structure, its characterized in that: the valve cover is arranged at the upper end of the valve body, the upper end opening of the valve body is sealed by the valve cover, a fluid inlet channel and a fluid outlet channel are respectively arranged at the two ends of the valve body, the inlet channel and the outlet channel are communicated with the upper end opening of the valve body, and the valve clack is arranged in the upper end opening of the valve body and blocks the inlet channel and the outlet channel when the valve is closed.

2. A stop-and-double valve according to claim 1, characterized in that: the upper end of valve clack is provided with the valve clack lid, valve clack lid and valve clack fixed connection, the valve rod passes valve gap and valve clack lid, and the valve rod lower extreme is provided with the step, be provided with the filler on the valve gap of valve rod, the upper end of filler compresses tightly through gland, the side of valve gap is provided with the support, the fixed setting on the valve gap of one end of support, the other end of support passes through valve rod nut suit on the valve rod, the support passes through the screw with valve rod nut and is connected, valve rod nut and valve rod threaded connection, the valve clack upper end is the cavity structure, the bottom is the solid sealing face under the valve clack, the bottom forms sealed vice with the valve body sealing face under the.

3. A stop-and-double valve according to claim 1, characterized in that: the valve rod nut is made of copper alloy.

4. A stop-and-double valve according to claim 2, characterized in that: the improved check valve is characterized in that a hand wheel is arranged at the upper end of the valve rod, four tapered edges are arranged at the upper end of the valve rod, holes matched with the four tapered edges at the upper end of the valve rod are formed in the middle of the hand wheel, a threaded rod is arranged at the top of the valve rod, a nut is arranged on the threaded rod, a spring pad is arranged between the nut and the hand wheel, the packing gland and the valve cover are connected through an eyelet bolt, one end of the eyelet bolt is connected through a pin shaft, the other end of the eyelet bolt is connected through a nut.

5. A stop-and-double valve according to claim 1, characterized in that: the valve cover and the valve body are made of cast steel, and the valve clack is made of forged steel.

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