CN102878317B - Pneumatic ball valve reliable in sealing and low in opening-closing torque - Google Patents

Pneumatic ball valve reliable in sealing and low in opening-closing torque Download PDF

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Publication number
CN102878317B
CN102878317B CN201210410089.XA CN201210410089A CN102878317B CN 102878317 B CN102878317 B CN 102878317B CN 201210410089 A CN201210410089 A CN 201210410089A CN 102878317 B CN102878317 B CN 102878317B
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valve
ball
ring
ball valve
spheroid
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CN102878317A (en
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邱晓来
王汉洲
黄明金
林洁
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Chaoda Valve Group Co., Ltd.
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ZHEJIANG CHAODA VALVE CO Ltd
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Abstract

The invention relates to a valve, in particular to a pneumatic ball valve reliable in sealing and low in opening-closing torque. The pneumatic ball valve comprises a ball valve body with a valve cavity, a ball positioned in the valve cavity, a valve rod in linkage with the ball and a valve seat sealing mechanism arranged between the ball valve body and the ball. A valve seat component and an annular valve seat component cavity are in airtight fit to form a structure similar to a piston. A pre-tensioning elastic part and a three-way reversing valve are arranged on one side, opposite to the ball, of the ball valve body. The three-way reversing valve and a pressure control reversing valve are used for controlling pressure applied to the ball by the valve seat component under different conditions and an operating air source of a pneumatic device to realize the fact that when the valve is closed, the pressure applied to the ball by the valve seat component is large, the sealing performance is fine, and when the valve is opened, the pressure applied to the ball by the valve seat component is small. Therefore, the opening power is low, a ball sealing face and a valve seat sealing face are less prone to damage during opening, the service life of the ball valve is prolonged, and the pneumatic ball valve has a function of preventing misopertion of opening when large pressure is applied to the ball by the valve seat.

Description

A kind ofly seal the pneumatic ball valve that reliable open and close torque is little
Technical field
The present invention relates to a kind of valve, more particularly it relates to a kind of pneumatic ball valve that reliable open and close torque is little that seals.
Background technique
Pneumatic ball valve is a kind of use valve very widely, its structure generally include have valve pocket ball valve body, be placed in valve pocket inside spheroid, and the valve rod that is connected of spheroid and be placed in ball valve body and spheroid between valve seat, described valve stem part is placed on ball valve body outside, ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, and Pneumatic actuator provides at source of the gas under the effect of pressurized gas and drives 90 ° of rotations of spheroid to make ball valve reach the switching of opening and closing by valve rod.The valve base sealing structure of tradition fixing ball valve and force analysis are as shown in Figure 1, 2, in figure, 1A is spheroid, 2A is valve seat insert, 3A is valve seat, 4A is spring, 5A is ball valve body, and 6A is the sealing between ball valve body and valve seat, and the sealing between spheroid and valve seat insert normally relies on the pretightening force of spring and acts on making a concerted effort of valve seat these two power of medium power behind.Conventionally the pretightening force of spring is only used to guarantee fitting tightly of spheroid and valve seat insert, plays initial seal action.The cross section of valve seat is equivalent to a piston, by changing the design of valve seat, can change the size that acts on medium power on valve seat, and the differential pressure area that increases valve seat can increase the thrust of medium.In order to improve the spheroid of ball valve and the sealability between valve seat insert, by increasing, act on valve seat medium power behind and can realize.Yet, acting on valve seat medium power behind larger, the adhesive force between spheroid and valve seat insert is larger, and the frictional force between them is also larger, just needs larger steering force, or need larger driving mechanism during Open valve.In addition, when the sealing force between spheroid and valve seat insert is excessive, when Open valve, easily cause the damage of valve sealing face, while particularly containing solid particle in medium, more easily damage.In a word, from improving the angle of valve base seal property, need to increase valve seat medium thrust behind, but, from reducing the open and close torque of valve and the angle that prevents the damage of sealing surface, need to reduce valve seat medium thrust behind, therefore, this is conflict, and this contradiction is perplexing the design of ball valve for a long time.
Summary of the invention
The deficiency existing for prior art, the object of the present invention is to provide a kind of seal reliable and the little pneumatic ball valve of open and close torque.
For achieving the above object, the invention provides following technological scheme: a kind ofly seal the pneumatic ball valve that reliable open and close torque is little, comprise the ball valve body with valve pocket, be placed in the spheroid of valve pocket inside, and the valve rod that spheroid is connected and be placed in ball valve body and spheroid between valve seat sealing mechanism, valve pocket both sides respectively with inlet passage and outlet passage UNICOM, described valve stem part is placed on ball valve body outside, ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, it is characterized in that: described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve, described ball valve body internal chamber wall is provided with opening towards the ring valve holder assembly chamber of spheroid, the relative spheroid of described valve component is slidably disposed in ring valve holder assembly chamber, described valve component and ring valve holder assembly chamber air-tight fit form similar piston structure, a described ball valve body dorsad side of spheroid is provided with pretension elastic component, described ball valve body is provided with and the valve component valve support chamber passage that the ring valve holder assembly chamber conducting of spheroid one side is connected dorsad, three interfaces of described three-way diverter valve respectively with valve support chamber passage, inlet passage and outlet passage UNICOM, under pneumatic ball valve closed condition, described inlet passage is through three-way diverter valve and described valve support chamber passage UNICOM, when pneumatic ball valve is opened, described valve support chamber passage is through three-way diverter valve and outlet passage UNICOM, described pneumatic ball valve is also provided with pressure and controls selector valve, described pressure is controlled selector valve and is serially connected in the air feed source of the gas pipeline of Pneumatic actuator, it is normally off that described pressure is controlled selector valve, when the pressure of outlet passage and the pressure difference in ring valve holder assembly chamber reach setting value, it is open-minded that pressure is controlled selector valve.
By adopting technique scheme, when spheroid is in closed position, be that ball valve is when close, in order to ensure valve reliable sealing, handle three-way diverter valve, make valve support chamber passage and inlet passage UNICOM and disconnect with outlet passage, now, the medium of valve inlet side elevated pressures enters into ring valve holder assembly chamber, pressure medium promotes valve component and is affixed to spheroid, thereby forms tight sealing.When needs are opened, first switching three-way selector valve, make valve support chamber passage and outlet passage UNICOM and disconnect with inlet passage, now, the pressure that pressure in ring valve holder assembly chamber is lower with valve export side is identical, the pressure of valve component both sides is in a basic balance, the pressure that valve component is affixed to spheroid only comes from pretension elastic component, and the elasticity pretightening force of pretension elastic component is conventionally less, now, valve component is very little to the pressure of spheroid and sealing force, the frictional force of sealing surface is also very little, therefore can adopt less torque force to open ball valve, Pneumatic actuator Open valve that can selection of small, reduced the volume of valve, reduced cost, in addition, due to when the Open valve, the sealing force of valve component and spheroid is very little, therefore, is not easy to cause the damage of ball seal face, has extended working life, has solved and has opened and closed the contradiction between torsion and ball valve sealing performance.In addition, wherein the break-make of pressure control selector valve is decided by the pressure of valve export passage and the pressure difference value in ring valve holder assembly chamber, when both pressure differences are greater than a certain setting value, show that ring valve holder assembly chamber is communicated with the inlet passage of valve, and valve enters, the pressure reduction of outlet passage is larger, now valve component and spheroid fit tightly, now pressure is controlled selector valve disconnection, be that Pneumatic actuator and source of the gas disconnect, therefore cannot carry out by Pneumatic actuator the switch motion of valve, prevent that between valve component and spheroid frictional force opens ball valve by Pneumatic actuator in large and cause the damage to sealing surface, and when both pressure reduction is less than a certain setting value, the pressure difference that shows ring valve holder assembly chamber and valve export channel connection or valve inlet/outlet passage is less, now between valve component and spheroid, sealing force and frictional force are less, now pressure is controlled selector valve conducting, be that Pneumatic actuator and source of the gas are connected, therefore can by Pneumatic actuator, carry out the action of valve switch, so just improve safety factor, prevent that misoperation from bringing the infringement to ball valve.
The present invention is further set to: described ring valve holder assembly chamber is that the approximate rectangular annular groove in cross section forms, described valve component comprises the ring valve seat body that sectional shape and annular groove cross section match and is embedded the valve seat insert on ring valve seat body, on the inside-and-outside ring sidewall of described ring valve seat body, being equipped with seal ring contacts and forms described piston structure with the sidewall sealing in ring valve holder assembly chamber, sealing surface and the spheroid of described valve seat insert are affixed, described ring valve seat body is evenly provided with a plurality of spring cavity volumes with being provided with on the opposing face of valve seat insert, in described spring cavity volume, be provided with Compress Spring and form described pretension elastic component, on described ball valve body, the position in close ring valve holder assembly chamber is provided with the pipeline of annular groove bottom UNICOM and forms described valve support chamber passage.
By adopting ring valve holder assembly chamber and the valve component of said structure, relatively simple for structure, easy to make.
The present invention is further set to: in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM, be provided with filtrating equipment.
The solid impurity that flowing medium in pipe-line system contains enters into three-way diverter valve and ring valve holder assembly cavity, by taking to be provided with filtrating equipment or piston mechanism in the pipeline of three-way diverter valve and inlet passage and outlet passage UNICOM, can effectively prevent that solid impurity from entering into three-way diverter valve and ring valve holder assembly cavity.
Accompanying drawing explanation
Fig. 1 is existing ball seat portion structure sectional view;
Fig. 2 is the stressed schematic diagram in existing ball seat position;
Fig. 3 is specific embodiment of the invention structural representation;
Fig. 4 is specific embodiment of the invention part-structure schematic diagram while being provided with piston;
Fig. 5 is semispherical valve specific embodiment structural representation of the present invention;
Fig. 6 is that specific embodiment of the invention pressure is controlled structure of reversing valve schematic diagram;
Embodiment
As shown in Figure 3, seal the pneumatic ball valve that reliable open and close torque is little, comprise the ball valve body 1 with valve pocket, be placed in the spheroid 2 of valve pocket inside, and the valve rod 3 that spheroid 2 is connected and be placed in ball valve body 1 and spheroid 2 between valve seat sealing mechanism, valve pocket both sides respectively with inlet passage 4 and outlet passage 5 UNICOMs, described valve rod 3 parts are placed on ball valve body 1 outside, ball valve body 1 outside is provided with the Pneumatic actuator 6 of actuate valve stem 3 rotations, described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve 7, described ball valve body 1 internal chamber wall is provided with opening towards the ring valve holder assembly chamber 8 of spheroid 2, the relative spheroid 2 of described valve component is slidably disposed in ring valve holder assembly chamber 8, described valve component and ring valve holder assembly chamber 8 air-tight fit form similar piston structure, a described ball valve body 1 dorsad side of spheroid 2 is provided with pretension elastic component 9, described ball valve body 1 is provided with and the valve component valve support chamber path 10 that ring valve holder assembly chamber 8 conductings of spheroid 2 one sides are connected dorsad, described three-way diverter valve 7 can be manual reverse of direction, also can be solenoid directional control valve, three interfaces of described three-way diverter valve 7 respectively with valve support chamber path 10, inlet passage 4 and outlet passage 5 UNICOMs, under valve closing state, described inlet passage 4 is through three-way diverter valves 7 and described valve support chamber path 10 UNICOM, when valve opening, described valve support chamber path 10 is through three-way diverter valve 7 and outlet passage 5 UNICOMs, described pneumatic ball valve is also provided with pressure and controls selector valve 11, described pressure is controlled selector valve 11 and is serially connected in the air feed source of the gas pipeline of Pneumatic actuator 6, it is normally off that described pressure is controlled selector valve 11, when the pressure of outlet passage 5 and the pressure difference in ring valve holder assembly chamber 8 reach setting value, it is open-minded that pressure is controlled selector valve 11.As shown in Figure 3, in this specific embodiment, described ring valve holder assembly chamber 8 is that the approximate rectangular annular groove in cross section forms, described valve component comprises the ring valve seat body 12 that sectional shape and annular groove cross section match and is embedded the valve seat insert 13 on ring valve seat body 12, on the inside-and-outside ring sidewall of described ring valve seat body 12, being equipped with seal ring 14 contacts and forms described piston structure with the sidewall sealing in ring valve holder assembly chamber 8, the sealing surface of described valve seat insert 13 and spheroid 2 are affixed, described ring valve seat body 12 is evenly provided with a plurality of spring cavity volumes 15 with being provided with on the opposing face of valve seat insert 13, general 3-6, in described spring cavity volume 15, be provided with Compress Spring, the free length of Compress Spring is slightly longer than the degree of depth of spring cavity volume 15, the bottom that two ends are against respectively spring cavity volume 15 and annular groove forms described pretension elastic component 9.Described pretension elastic component 9 also can as rubber, consider that the elastic module of spring is large, flexibly movable for other elastic materials form, and the present embodiment is preferred.In order to prevent that ring valve seat body 12 from coming off, the opening in described ring valve holder assembly chamber 8 is preferably provided with annular pressing plate 17; On described ball valve body 1, the position in close ring valve holder assembly chamber 8 is provided with the pipeline of annular groove bottom UNICOM and forms described valve support chamber path 10.Consider under some operating mode, flowing medium in pipe-line system contains solid impurity, for fear of impurity, enter in three-way diverter valve 7 and ring valve holder assembly chamber 8 and cause cisco unity malfunction, as shown in Figure 3, in the pipeline of described three-way diverter valve 7 and inlet passage 4 and outlet passage 5 UNICOMs, be provided with filtrating equipment or piston apparatus 19, left and right balance by piston in piston apparatus 19 moves, make the ring valve holder assembly chamber 8 can be as required and the pressure balance of valve inlet end or outlet end, effectively prevent that solid impurity from entering into three-way diverter valve 7 and ring valve holder assembly chamber 8 simultaneously.Pressure is controlled selector valve 11 can have various ways to realize, and as shown in Figure 6, in this specific embodiment, pressure is controlled the similar stop valve of structure of selector valve 11, comprises commutation valve body 26, valve gap 21, flap 27 and commutation valve rod.Described valve gap 21 tops are integrally formed with a piston cavity, commutation valve rod 25 upper ends penetrate in piston cavity, upper end portion is fixedly connected with a piston piston cavity is divided into valve gap 21 upper piston chambeies 22 and lower piston chamber 23, penetrate in piston cavity on the commutation valve rod 25 of part and be arranged with pressure adjusting spring 20, the import that pressure is controlled selector valve 11 is connected with source of the gas 24, outlet is connected with the source of the gas input end of Pneumatic actuator 6, described valve gap 21 upper piston chambeies 22 and ring valve holder assembly chamber 8 UNICOMs, described lower piston chamber 23 and ball valve outlet passage 5 UNICOMs, reach described pressure and control selector valve 11 for normally off, when the pressure of outlet passage 5 and the pressure difference in ring valve holder assembly chamber 8 reach setting value, pressure is controlled the function that selector valve 11 is opened.
These ring valve holder assembly chamber 8 and ring valve seat body 12 sectional shapes that seal the ball valve that reliable open and close torque is little are not unique, as long as the central axes of the cylndrical surface at two annular sidewall place or parallel.
The present invention is applicable to the pneumatic ball valve of semiglobe equally, and as shown in Figure 5, its structure is similar to the aforementioned embodiment, is one-sided one group of ring valve holder assembly chamber 8 and the valve component of being provided with.
The working principle that seals the pneumatic ball valve that reliable open and close torque is little is as follows: when spheroid 2 is in closed position, be that ball valve is when close, handle three-way diverter valve 7, make valve support chamber path 10 and inlet passage 4 UNICOMs and disconnect with outlet passage 5, now, the medium of valve inlet side elevated pressures enters into ring valve holder assembly chamber 8, pressure medium promotes valve component and is affixed to spheroid 2, thereby forms tight sealing.And when three-way diverter valve 7 make valve support chamber path 10 and inlet passage 4 UNICOMs and with outlet passage 5 disconnections, that is to say also do not carry out open ball valve preparation time, now the pressure in ring valve holder assembly chamber 8 is much larger than the pressure of valve export passage 5, that is to say that the pressure that pressure is controlled in selector valve 11 valve gap 21 upper piston chambeies 22 is greater than the pressure in lower piston chamber 23, pressure is controlled selector valve 11 and is closed, Pneumatic actuator 6 can not obtain work source of the gas and cannot work, avoided the large pressure to spheroid 2 at valve component, under the state of large frictional force, open ball valve, ball valve is caused damage, when needs are opened ball valve, first switching three-way selector valve 7, make valve support chamber path 10 and outlet passage 5 UNICOMs and disconnect with inlet passage 4, now, the pressure that pressure in ring valve holder assembly chamber 8 is lower with valve export side is identical, the pressure of valve component both sides is in a basic balance, the pressure that valve component is affixed to spheroid 2 only comes from pretension elastic component 9, and the elasticity pretightening force of pretension elastic component 9 is conventionally less, now, valve component is very little to the pressure of spheroid 2 and sealing force, and the frictional force of sealing surface is also very little, therefore can adopt less torque force to open ball valve.Due to the pressure in ring valve holder assembly chamber 8 now and the lower pressure of valve export side basic identical, under the effect of pressure adjusting spring 20, the pressure that pressure is controlled in selector valve 11 lower piston chambeies 23 is greater than the pressure in valve gap 21 upper piston chambeies 22, pressure is controlled selector valve 11 and is opened, Pneumatic actuator 6 obtains work source of the gas, can complete the action of opening ball valve.By adjusting the pressure of pressure adjusting spring 20, can regulate the setting value of valve component to spheroid 2 pressure while allowing ball valve to open.

Claims (4)

1. one kind seals the little pneumatic ball valve of reliable open and close torque, comprise the ball valve body with valve pocket, be placed in the spheroid of valve pocket inside, and the valve rod that spheroid is connected and be placed in ball valve body and spheroid between valve seat sealing mechanism, valve pocket both sides respectively with inlet passage and outlet passage UNICOM, described valve stem part is placed on ball valve body outside, ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, it is characterized in that: described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve, described ball valve body internal chamber wall is provided with opening towards the ring valve holder assembly chamber of spheroid, the relative spheroid of described valve component is slidably disposed in ring valve holder assembly chamber, described valve component and ring valve holder assembly chamber air-tight fit form similar piston structure, a described ball valve body dorsad side of spheroid is provided with pretension elastic component, described ball valve body is provided with and the valve component valve support chamber passage that the ring valve holder assembly chamber conducting of spheroid one side is connected dorsad, three interfaces of described three-way diverter valve respectively with valve support chamber passage, inlet passage and outlet passage UNICOM, under pneumatic ball valve closed condition, described inlet passage is through three-way diverter valve and described valve support chamber passage UNICOM, when pneumatic ball valve is opened, described valve support chamber passage is through three-way diverter valve and outlet passage UNICOM, described pneumatic ball valve is also provided with pressure and controls selector valve, described pressure is controlled selector valve and is serially connected in the air feed source of the gas pipeline of Pneumatic actuator, it is normally off that described pressure is controlled selector valve, when the pressure of outlet passage and the pressure difference in ring valve holder assembly chamber reach setting value, it is open-minded that pressure is controlled selector valve.
2. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1, it is characterized in that: described ring valve holder assembly chamber is that the approximate rectangular annular groove in cross section forms, described valve component comprises the ring valve seat body that sectional shape and annular groove cross section match and is embedded the valve seat insert on ring valve seat body, on the inside-and-outside ring sidewall of described ring valve seat body, being equipped with seal ring contacts and forms described piston structure with the sidewall sealing in ring valve holder assembly chamber, sealing surface and the spheroid of described valve seat insert are affixed, described ring valve seat body is evenly provided with a plurality of spring cavity volumes with being provided with on the opposing face of valve seat insert, in described spring cavity volume, be provided with Compress Spring and form described pretension elastic component, on described ball valve body, the position in close ring valve holder assembly chamber is provided with the pipeline of annular groove bottom UNICOM and forms described valve support chamber passage.
3. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1, is characterized in that: in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM, be provided with filtrating equipment.
4. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1, is characterized in that: in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM, be provided with piston apparatus.
CN201210410089.XA 2012-10-23 2012-10-23 Pneumatic ball valve reliable in sealing and low in opening-closing torque Active CN102878317B (en)

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CN102878317B true CN102878317B (en) 2014-03-12

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