CN110848429A

CN110848429A - Cut-off double-purpose valve

Info

Publication number: CN110848429A
Application number: CN201810951209.4A
Authority: CN
Inventors: 杨刚保; 余中华; 王春霞
Original assignee: Anhui Dazhong Valve Co Ltd
Current assignee: Anhui Dazhong Valve Co Ltd
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2020-02-28

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

Cut-off double-purpose valve

Technical Field

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

Background

At present, in the market, it is very difficult to find a valve that can both be used as the dual-purpose function as an organic whole that cuts and can be used as the non return, installs stop valve and check valve in the pipe-line system simultaneously usually. 1. The stop valve is composed of parts such as a valve body, a valve cover, a valve clack, a valve rod and the like, and has the main function of cutting off and connecting pipeline media; 2. the check valve is also called as a reverse valve, consists of a valve body, a valve cover, a valve clack and other parts, and is mainly used on a pipeline with unidirectional medium flow to prevent the medium in the pipeline from flowing backwards. The two valves are widely applied to pipelines in various industries due to simple structure, but have the following problems:

1. the stop valve and the check valve are generally in a straight-through structure, so the flow resistance coefficient is large, the two valves are arranged on a pipeline in series, the head loss is increased, the energy consumption is increased, and the energy conservation and emission reduction are not facilitated.

2. In view of cost, the two valves are simultaneously arranged on the pipeline, so that the economic burden of a user is increased.

3. From the installation and maintenance aspects, the two valves are used in a pipeline system simultaneously, so that larger installation space is needed, and the maintenance cost is increased.

4. The check valve belongs to an automatic valve, the opening and closing actions of the check valve are driven by the energy of a medium, the sealing performance of the check valve is better when the pressure of medium backflow is larger, and if the pressure of the medium backflow is too small, the valve is likely to leak, and the check valve loses the effect.

Disclosure of Invention

The invention aims to solve the problems, 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 a medium backflow valve cannot check and has leakage.

In order to realize the above performance and characteristics, the technical scheme of the invention is as follows:

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, the valve gap sets up the upper end at the valve body, the valve gap is uncovered the sealing in the upper end of valve body, the both ends of valve body are equipped with fluid inlet channel and fluid outlet channel respectively, inlet channel and outlet channel all with the uncovered intercommunication in the upper end of valve body, the valve clack sets up in the upper end of valve body opens mouthful to block inlet channel and outlet channel when the valve is closed.

Compared with the prior art, the invention has the advantages that:

1. the invention relates to a valve which integrates the double functions of both cutting off and stopping.

2. The stop-double-purpose valve has multiple purposes, not only reduces the installation space and saves the cost, but also can reduce the pressure loss on a pipeline system, and can perform forced sealing when the medium backflow valve cannot stop the backflow and leaks.

3. The valves of two kinds of functions are integrated as an organic whole, easy to assemble and maintain to reduce installation space. Drawings

FIG. 1 is a block diagram of a shut-off dual use valve according to an embodiment of the present invention;

FIG. 2 is a structural diagram of the shut-off dual-purpose valve in a fully open state according to the embodiment of the present invention;

FIG. 3 is a structural diagram of the check state of the stop dual-purpose valve according to the embodiment of the invention;

reference numerals: 1-nut, 2-spring washer, 3-hand wheel, 4-valve stem, 5-screw, 6-valve stem nut, 7-support, 8-nut, 9-packing gland, 10-swing bolt, 11-pin, 12-packing, 13-nut, 14-stud, 15-gasket, 16-valve flap cover, 17-valve flap, 18-valve body, 19-valve cover.

Detailed Description

The technical scheme of the invention is clearly and completely described in the following with the accompanying drawings of the specification.

The invention relates to a valve which is applied to the industries of chemical industry, water conservancy, smelting, electric power and the like and can be used in transmission and distribution systems of water supply and drainage, natural gas, steam, petroleum, chemical engineering fluids and the like. The working state is full on or full off. The installation on the pipeline can only be horizontal, namely the hand wheel 3 faces upwards.

A stop double-purpose valve as shown in fig. 1 to 3, which comprises a valve cover 19, a valve body 18, a valve rod 4 and a valve flap 17, wherein the valve body 18 is of a three-way structure, the valve cover 19 is arranged at the upper end of the valve body 18, the upper end opening of the valve body 18 is closed by the valve cover 19, two lateral ends of the valve body 18 are respectively provided with a fluid inlet channel and a fluid outlet channel, the inlet channel and the outlet channel are both communicated with the upper end opening of the valve body 18, the valve flap 17 is arranged in the upper end 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 the valve flap cover 16, the valve flap cover 16 is fixedly connected with the valve flap 17, the valve rod 4 passes through the valve cover 19 and the; the packing 12 is arranged on the contact surface of the valve cover 19 and the valve rod 4, the upper end of the packing 12 is tightly pressed through the packing gland 9, the side surface of the valve cover 19 is provided with the support 7, one end of the support 7 is fixedly arranged on the valve cover 19, the other end of the support is sleeved on the valve rod 4 through the valve rod nut 6, the support 7 is connected with the valve rod nut 6 through the screw 5, the valve rod nut 6 is in threaded connection with the valve rod 4, and the valve rod 4 can move up and down linearly relative to the valve body 18; the upper end of the valve clack 17 is a hollow structure, and the lower bottom end of the valve clack is a solid sealing surface which forms a sealing pair with a sealing surface of the valve body 18; the valve supports and positions the valve rod 4 through the support 7, so that the valve can run more stably and reliably. The valve rod nut 6 is made of copper alloy, and can improve the wear resistance and prolong the service life when being matched with the valve rod 4. The upper end of the valve rod 4 is provided with a hand wheel 3, the upper end of the valve rod 4 is provided with four conical edges, the middle part of the hand wheel 3 is provided with holes matched with the four conical edges at the upper end of the valve rod 4, the top of the valve rod 4 is provided with a threaded rod, the threaded rod is provided with a nut 1, a spring pad 2 is arranged between the nut 1 and the hand wheel 3, the nut 1 and the spring pad 2 are used for preventing the hand wheel 3 from loosening and falling off at the position of the valve rod 4, and the hand wheel 3 is rotated. The packing gland 9 and the valve cover 19 are connected through an eyelet bolt 10, one end of the eyelet bolt 10 is connected through a pin shaft 11, the other end of the eyelet bolt 10 is connected through a nut 8, the valve cover 19 and the valve body 18 are fixedly connected through a stud 14 and are pressed tightly through a nut 13, and the valve is more conveniently disassembled and assembled through the eyelet bolt 10.

The valve cover 19 and the valve body 18 are made of cast steel, and the valve flap 17 is made of forged steel. The contact surface of the valve flap 17 and the valve body 18 is made of stainless steel or hard alloy which is resistant to corrosion, high in strength and high in abrasion resistance through overlaying, even after the valve is used for a long time, the sealing performance of the valve flap 17 and the valve body 18 can be guaranteed through the welding part of the sealing surface, and the contact surface of the valve cover 19 and the valve body 18 is provided with the gasket 15 which prevents a medium from leaking between the valve cover 19 and the valve body 18.

In a normal flowing state of the pipeline system, if fluid needs to be cut off, the hand wheel 3 is rotated clockwise to drive the valve rod 4 and the valve clack 17 to move downwards until a sealing surface of the valve clack 17 is attached to a sealing surface of the valve body 18 to form forced sealing, as shown in fig. 1, at the moment, the valve is in a closed state, and the pipeline system stops running. When fluid in a pipeline needs to be communicated and a valve needs to be opened, the hand wheel 3 is rotated anticlockwise, the valve rod 4 moves upwards and axially along with anticlockwise rotation until the hand wheel 3 is fixed, at the moment, the large-diameter part at the lower part of the valve rod 4 is propped against the edge of an inner hole of the valve cover 19, at the same time, under the thrust of a valve inlet medium, the valve clack 17 moves upwards and linearly until the bottom end of the inner hole of the valve clack 17 is propped against the head of the lower end of the valve rod 4, at the moment, the valve is fully opened, and as shown in fig. 2, the function of forcibly opening and closing the stop; when the water pump needs to be stopped or suddenly cut off in an accident, the pressure in the pipeline system is instantaneously zero, the valve flap 17 vertically falls under the action of self gravity until the sealing surface is attached to the sealing surface of the valve body 18, the medium starts to flow back, the medium pressure acts on the upper surface of the valve flap 17, and finally a backwater seal is formed, as shown in fig. 3, when the water pump is started again, the valve flap 17 axially moves upwards under the thrust of the medium until the valve flap is fully opened, and the function that the check valve is opened and closed according to the self power of the medium is completed; when the medium backflow pressure is small, the sealing pair between the valve clack 17 and the valve body 18 does not form enough sealing specific pressure, and leakage is possible to generate, at the moment, the hand wheel 3 can be rotated clockwise to drive the valve rod 4 to move axially downwards until the head of the valve rod 4 transmits the force to the valve clack 17 to form forced sealing, which is a function that cannot be realized by a common check valve. Therefore, the invention can meet the functions of the stop valve and the check valve, has double functions of one valve, reduces the use of pipeline elements, reduces the head loss, and is more favorable for pipeline maintenance and reduces external leakage points.

Claims

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.