CN201593622U - Non-rising stem type gate valve - Google Patents
Non-rising stem type gate valve Download PDFInfo
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- CN201593622U CN201593622U CN2009202922200U CN200920292220U CN201593622U CN 201593622 U CN201593622 U CN 201593622U CN 2009202922200 U CN2009202922200 U CN 2009202922200U CN 200920292220 U CN200920292220 U CN 200920292220U CN 201593622 U CN201593622 U CN 201593622U
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- type gate
- rising stem
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Abstract
The utility model provides a non-rising stem type gate valve, comprising a valve body, a valve cover connected on the valve body, a valve rod, a valve clack and a transmission device, wherein the upper end of the valve rod is connected with the transmission device, and the lower end thereof is connected with the valve clack; and the valve rod is supported in the valve cover by a rolling bearing in a relatively rotating manner. By using the over-torque security transmission device, the gate valve can effectively protect parts inside the valve when the operating torque is overlarge. A guide shoe is also used for realizing precise positioning on the valve clack in encapsulation process, and the encapsulation thickness is uniform. The gate valve has small operating torque, reliable sealing, long service life and simple assembling.
Description
Technical field
The utility model relates to a kind of inside screw non-rising stem type gate valve that uses in pipe network system.
Background technique
Gate valve is widely used a kind of valve in the pipe network system, also often is referred to as gate valve, gate valve.In gate valve, drive closure member (that is flap) by valve rod and move the media flow of cutting off and opening in the pipeline along the direction vertical with the valve seat center line.Gate valve is applicable to the operating mode that will keep flap standard-sized sheet or full cut-off and not need often to open and close usually.The characteristics of gate valve are: the standard-sized sheet fluid resistance is little; Open and close laborsaving special circumstances such as (do not comprise sealing surface) biting; Can under the situation of medium two-way flow, use, not have directivity; Sealing surface is not vulnerable to erosion during standard-sized sheet; Structure length is short, not only is fit to do the little valve of size, and is fit to do the big valve of size.
Gate valve can be divided into two kinds according to the seal style of valve seat: a kind of is the metallic seal gate valve, and wherein the valve base sealing pair is a metal o-ring; Another kind is the elastic packing gate valve, and wherein the flap skin is coated with elastomers such as rubber.Along with the development of technology, the present gate valve in gate valve, especially mesolow such as building, the domestic water pipe network system of pipe network system adopts the pattern of elastic packing more.In addition, gate valve also can be divided into two kinds according to the position of threaded stem: a kind of is inside screw non-rising stem type gate valve, and wherein the motion thread pair is in the valve rod lower end, and valve rod can only rotate can't lifting; Another kind is the rising stem gate valve, and wherein the motion thread pair is in the valve rod upper end, and valve rod can only move up and down but can't rotate.
The structure and the operation of gate valve are described below with reference to a kind of traditional elastic sealing inside screw non-rising stem type gate valve 100 shown in Figure 1.As shown in Figure 1, gate valve 100 comprises valve body 102, is fixed to valve gap 103, valve rod 104, flap 105 and cap transmission on the valve body 102 by screw 110.Valve rod 104 can be installed in the valve gap 103 with the relative rotation by plane sliding bearing 109, makes valve rod 104 only can rotate around vertical center line, and can not vertically move.For realizing the sealing between valve rod 104 and the valve gap 103, directly fluting is placed O-ring seals 108 on valve rod 104.Flap nut 107 is threaded with valve rod 104 in the lower end of valve rod 104, and this flap nut 107 is connected with flap 105.The shape of the shape of flap 105 and valve body 102 inner chambers adapts with opening and closing gate valve 100.The outside generally meeting encapsulate of flap 105 is promptly wrapped certain thickness elastomer layer (for example rubber layer 111) to realize the elastic packing of flap to flowing medium.
The cap transmission (not shown) cooperates 106 places, upper end that are installed in valve rod 104, is used to operate gate valve 100.When work, by rotating cap transmission, actuate valve stem 104 is rotated, and makes flap nut 107 and flap 105 move up and down along valve rod 104 together, realizes the keying of gate valve 100.
Mainly there is following problem in this traditional elastic packing gate valve.
Because adopt plane sliding bearing, the coefficient of sliding friction is big.Coefficient of sliding friction when for example, kinematic pair is steel and copper is 0.1-0.15.This causes sealing and operation moment of torsion big, correlated parts easy deformation and destruction, and fatigue life is short, and makes the assembling difficulty of gate valve.
State in the use under the situation of conventional cap transmission, operator may load excessive moment of torsion, cause the valve internal part to be damaged because of bearing too high load.
Existing flap encapsulate generally adopts the certain thickness rubber skin of pad to locate inner coarse flap foundry goods.But flexible rubber can produce than large deviation when discontinuity, makes encapsulate in uneven thickness.Like this, the place that thickness is thin partially is in use damaged easily, makes inner gate valve component exposed in medium and corroded.In addition, because rubber layer thickness is inhomogeneous, it is higher also can to cause operating moment of torsion.
The model utility content
The purpose of this utility model be address the above problem and provide that a kind of operation moment of torsion is little, sealing is reliable, long service life and assemble simple gate valve, its can be when the operation moment of torsion be excessive effective protection valve inner components.
According to the utility model, a kind of inside screw non-rising stem type gate valve is provided, it comprises valve body, is connected to valve gap, valve rod, flap and transmission device on the valve body, the upper end of described valve rod is connected with transmission device, the lower end of described valve rod is connected with flap, and wherein said valve rod is supported in the described valve gap rotatably by rolling bearing.
According to the utility model, adopted the rolling bearing of low coefficient of friction to replace the general at present planar slide friction structure spare that adopts, because coefficient of rolling friction little (range of friction coefficients is 0.002-0.004), can reduce effectively to rub and the operation moment of torsion of valve, prolong the life-span of moving element, thereby prolong the working life of product.Rolling bearing also has the function of axially locating and support simultaneously.
Preferably, described transmission device comprises the cap transmission, the safety block that is used for the connecting sleeve that is connected with described valve rod and connects described cap transmission and described connecting sleeve that is used for being applied by the user operation moment of torsion, and described safety block disconnects the connection between described cap transmission and the described connecting sleeve when the moment of torsion that bears greater than predetermined torque.Wherein, safety block comprises the top that links to each other with described cap transmission, the bottom that links to each other with described connecting sleeve and the intermediate portion that is connected the upper and lower, and the cross sectional area of described intermediate portion is less than the cross sectional area of described top and described bottom.
According to this super moment of torsion insurance transmission device of the present utility model, when the operation moment of torsion surpasses safety value, will rupture failure.Therefore, can prevent that excessive operation moment of torsion from continuing to be delivered on the component of gate valve inside, can effectively protect the inner components of valve.And, the safety block that only need change destruction owing to need not to change gate valve, thus maintenance cost reduced.
Preferably, described flap comprises flap foundry goods, guiding footwear and encapsulate layer, and described guiding footwear cooperation is installed in the groove of described flap foundry goods, in the process of described flap encapsulate described flap foundry goods is located.
Utilize pinpoint guiding footwear to carry out encapsulate according to flap of the present utility model, the encapsulate location is accurate, and effectively the controlling packet bondline thickness meets design requirement, and guarantees that thickness is even, thereby realizes the operation moment of torsion of design, increases fatigue life.
Preferably, described gate valve also comprises the shaft-cup that is installed in described valve gap top, is provided with the Sealing of multiple tracks combination between described shaft-cup and described valve rod.The sealing part can comprise O type circle and PTFE (teflon) back-up ring.
In according to gate valve of the present utility model,, form multiple-sealed by being used in combination O type circle and PTFE back-up ring.In addition, the PTFE material has self-lubricating function, so can reduce the wearing and tearing of O type circle, prolongs the working life of whole sealing pair.
Preferably, connect described valve body and described valve gap and described valve gap and described shaft-cup by hexagon socket countersunk flat cap head screw.According to the hexagon socket countersunk flat cap head screw that is adopted in the gate valve of the present utility model because cooperating of the tapering face of the tapering face of head and institute connected element can be located valve gap, shaft-cup better automatically.Thereby, make institute's connected element can be better, centering more effectively, and need not assembling adjustment, reduced installation time and cost.
As mentioned above, have the following advantages according to gate valve of the present utility model: (1) owing to adopted rolling bearing, under the sealing load condition that requires to reach identical, the operation moment of torsion is less relatively; (2) when the operation moment of torsion was excessive, the safety block rupture failure in the transmission device can effectively be protected the parts in the gate valve; (3) the flap encapsulate is located defectives such as accurate, encapsulate thickness is even, nothing dew iron, seals reliably long service life; (4) because of the operation moment of torsion is low, flap thickness uniformity, under the identical working pressure condition, fatigue life is better, has prolonged the service time of valve; (5) multiple tracks selflubricating Seal Design seals more reliable, durable for a long time; (6) attachment screw of employing countersunk head, centering is effective, and assembling is simple.
Description of drawings
Fig. 1 is the schematic cross sectional views of existing elastic packing inside screw non-rising stem type gate valve;
Fig. 2 is the assembling stereogram according to gate valve of the present utility model;
Fig. 3 is the exploded perspective view according to gate valve of the present utility model;
Fig. 4 is the sectional view according to gate valve of the present utility model;
Fig. 4 A is the amplification view of part E among Fig. 4;
Fig. 5 A is the amplification view of rolling bearing part among Fig. 4;
Fig. 5 B is the exploded perspective view of this rolling bearing part;
Fig. 6 A is the sectional arrangement drawing according to the super moment of torsion safty device of gate valve of the present utility model;
Fig. 6 B is the assembling stereogram of these super moment of torsion safty device, wherein should be cutd open half so that its internal structure to be shown by super moment of torsion safty device;
Fig. 6 C is the exploded perspective view of these super moment of torsion safty device;
Fig. 6 D is the stereogram of the safety block in these super moment of torsion safty device;
Fig. 7 is the schematic representation according to the flap of gate valve of the present utility model;
Fig. 7 A is that flap among Fig. 7 is along the vertical view cutaway drawing of the A-A line among Fig. 7 B;
Fig. 7 B is the sectional view of this flap along the B-B line among Fig. 7 A;
Fig. 7 C is the stereogram of the guiding footwear in this flap;
Fig. 8 A, 8B illustrate to use the schematic representation of encapsulate mould to the flap encapsulate, and wherein Fig. 8 A illustrates the flap foundry goods is put into state before the mould, and Fig. 8 B illustrates the flap foundry goods is put into state after the mould;
Fig. 9 is the amplification view of the valve stem seal pair of gate valve shown in Figure 4;
Figure 10 A is the amplification view of the attachment screw of gate valve shown in Figure 4;
Figure 10 B is the partial perspective view that attachment screw position shown in Figure 10 A is shown.
Embodiment
Below in conjunction with accompanying drawing, further describe embodiment according to gate valve of the present utility model.Though it should be noted that and followingly mainly describe feature of the present utility model in conjunction with a kind of inside screw non-rising stem type gate valve of elastic packing, unless offer some clarification on, feature of the present utility model also is applicable to the gate valve of rising stem gate valve or metallic seal.
Shown in Fig. 2-4, comprise valve body 2, be connected to valve gap 3 on the valve body 2, be connected to shaft-cup 8, valve rod 4, flap nut 7, flap 5 and transmission device 6 on the valve gap 3 by attachment screw 10 by attachment screw 10 according to gate valve 1 of the present utility model.
Valve rod 4 is supported in the endoporus of valve gap 3 rotatably by rolling bearing 14 and corresponding axle sleeve 15, makes valve rod 4 only can rotate around vertical center line Z, and can not vertically move.The upper end of valve rod 4 cooperates installation with transmission device 6, makes operator valve rod 4 to be rotated by rotation transmission device 6.The outer surface of the lower end of valve rod 4 is provided with outside thread, be threaded with the internal thread with flap nut 7, thereby when valve rod 4 was rotating, flap nut 7 can move up and down along valve rod 4.As shown in Figure 3, the bottom of flap nut 7 is provided with flange, and this flange can snap in the groove 523 (as shown in Figure 7) on flap 5 tops, so that flap nut 7 and flap 5 become one.Like this, when flap nut 7 when valve rod 4 moves up and down, flap 5 is along with flap nut 7 moves together to open or close gate valve 1.When flap 5 moves up, open gate valve 1, realize the circulation of medium; When flap 5 moved down, closing gate valve 1 was by flowing of medium.
Being provided with sealing packing ring 12 between valve gap 3 and valve body 2 oozes out to prevent medium.For realizing the sealing of valve rod 4 and valve gap 3: below axle sleeve 15, between valve rod 4 and valve gap 3, be provided with seal ring 17; In valve gap 3 upper fixed the shaft-cup of being made by stainless steel 8 is installed, between shaft-cup 8 and valve rod 4, is provided with the valve stem seal pair 16 of multiple tracks combination.Dust ring 18 is installed in the groove on shaft-cup 8 tops, adds valve gap and valve inner to prevent dust.
Rolling bearing
As described above with reference to Figure 1, the structure that is used at present to support valve rod in the gate valve adopts the plane sliding bearing structure usually, kinematic pair is valve rod (common used material is carbon steel or stainless steel) and plane bearing (common used material is a Cuprum alloy), and its coefficient of sliding friction is generally 0.1-0.15.Shown in Fig. 5 A and 5B, in according to gate valve of the present utility model,, also guarantee certain safety coefficient simultaneously in order to reduce friction factor and operation moment of torsion, adopted the structure that supports valve rod 4 with rolling bearing 14.Particularly, at place, the top of valve gap 3, rolling bearing 14 is installed in up and down between two axle sleeves 15, and the high strength ball of rolling bearing 14 is contained in the groove set on the surface of valve rod 4.Kinematic pair is valve rod 4 and rolling bearing 14, and its coefficient of rolling friction is equivalent to deep groove ball bearing like this, only is 0.002-0.004.
What specifically contact between rolling bearing 14 and the valve rod 4 is the high strength ball of rolling bearing 14 and the groove in the valve rod 4, and its contact form is the line contact, and the active force between the kinematic pair also transmits in the mode that line contacts with reaction force.The requirement of satisfying design and related valve safety standard working life in order to ensure kinematic pair, the pairing management of also diameter of precision machined valve rod groove and high strength ball being divided into groups is guaranteed within the required scope of valve trouble free service will movement clearance each other to be controlled at.
Particularly, precision machined valve rod groove can be carried out size grouping screening pairing by the R angle.For example, when design valve rod groove radius base dimension is R3.000, when ball diameter base dimension is 6.000 (radius base dimension is R3.000), divide into groups to screen with deviation 0.01mm.Valve rod can be divided into three groups: valve rod A (R2.990-3.000), valve rod B (R3.000-3.010) and valve rod C (R3.010-3.020).Ball can be divided into three groups: ball A (radius R 2.980-R2.990), ball B (radius R 2.990-3.000) and ball C (radius R 3.000-3.010).Then with valve rod and ball by grouping pairing assembling, promptly valve rod A and ball A, valve rod B and ball B, valve rod C and ball C assemble, thereby guarantee the quality of fit of the kinematic pair that the trouble free service of gate valve is required.
In addition, can also rationally select the kinematic pair material of valve rod and ball for use according to different usage requirements.For example, valve rod can adopt quality carbon steel, SUS431 or other high-quality stainless steel material.Ball can adopt materials such as S440C, High Chrome Steel, bronze, pottery or cemented carbide.Can also carry out certain process treating so that its hardness and wear resistance satisfy particular requirement to material.For example valve rod can carry out quenching with Subsequent tempering, can and carry out polishing treatment or shot blast at valve rod groove place's hard chromium plating.
In addition, by the super torque protection transmission device 6 (Fig. 6 A-6D) that below will describe in detail, guaranteed that effectively the rolling bearing kinematic pair can not be damaged because of excessive operational load.By control valve body inner chamber casting size and the uniform flap of encapsulate thickness, guarantee that the practical operation moment of torsion of gate valve can not cause higher because of the fit dimension of sealing component is overproof.And, in actual production,, set the CLV ceiling limit value of quality acceptance standard by the operation torque value of every product of practical measurement, also guaranteed the safe operating life of rolling bearing kinematic pair.
Plane sliding bearing of the prior art is replaced with above-mentioned specially designed rolling bearing, reduced the friction factor between valve rod 4 and the rolling bearing 14 effectively, thereby reduce to operate moment of torsion significantly, also improved the working life of valve rod 4 and rolling bearing 14 kinematic pair.This can know from following contrast test.
For a kind of inside screw non-rising stem type gate valve, under all identical situation of other component (valve body 2, flap 5, valve gap 3 etc.) and test condition (test pressure, test instrumentation, tester), only plane sliding bearing is replaced by rolling bearing 14, carries out the moment of torsion contrast test, its test result is as follows.
Table 1 inside screw non-rising stem type gate valve moment of torsion contrast test
As can be seen from the above table, adopt rolling bearing can reduce by about 43% operation moment of torsion.
Transmission device
Describe according to the transmission device in the gate valve of the present utility model 6 below with reference to Fig. 6 A-6D.In traditional gate valve, general direct use is installed in the cap transmission of valve rod upper end and operates gate valve, damages the component of gate valve inside owing to apply excessive operation moment of torsion on cap transmission often in work like this, thereby has to change whole gate valve.In according to gate valve 1 of the present utility model, then adopted transmission device 6 to guarantee that safe operation moment of torsion is applied on the gate valve 1.
When assembling, the top 641 of safety block 64 is cooperated with cap transmission 62, bottom 642 cooperates with connecting sleeve 65, thereby the assembly that cap transmission 62, safety block 64 and connecting sleeve 65 threes link into an integrated entity is cooperated the upper end that is installed to valve rod 4.Then screw 63 is passed the through hole in cap transmission 62, safety block 64 and the connecting sleeve 65 and be locked in the hole of valve rod 4 upper ends.At last, the through hole that proof rubber plug 61 is clogged cap transmission 62 tops enters transmission device 6 to prevent dust etc.
In when operation, when operating device (T type operating stem or the like) when acting on cap transmission 62, the operation moment of torsion is delivered on the valve rod 4 through cap transmission 62, safety block 64, connecting sleeve 65, drives valve rod 4 rotations.When the minimum cross section bearing capacity of the intermediate portion 643 of operation moment of torsion over insurance piece 64, safety block 64 just lost efficacy or rupture failure, made moment of torsion can't be delivered to valve rod 4, thereby effectively protected gate valve 1 and inner component thereof.When safety block 64 is destroyed by excessive operation moment of torsion, only need easily change transmission device 6, and need not to change whole gate valve 1 in gate valve 1 outside, saved time and cost greatly.
The flap encapsulate
Existing flap encapsulate technology generally adopts the certain thickness rubber skin of pad to locate inner coarse flap foundry goods.But flexible rubber can be shifted when discontinuity and produce than large deviation, makes encapsulate in uneven thickness.This can produce adverse influence to the seal operation moment of torsion of sealing and gate valve.
For the seal operation moment of torsion of gate valve, under identical pressure condition, one of its main decisive is exactly the percentage of rubber compress variation in the sealing pair zone between the valve seat of body cavity and the flap.For example, the rubber design thickness of supposing the sealing area of flap both sides is 5mm, and the compress variation of pressure when being 16bar is 1.5mm.According to Design Theory and actual verification, under the situation of flap both sides encapsulate consistency of thickness, its compression percentages is 1.5/5=30%.If because of discontinuity produces skew 1mm, then the actual (real) thickness in flap both sides sealing zone is 4mm and 6mm just to flap in encapsulation process.Under the uniform pressure condition of 16bar, the seal compression of rubber still needs 1.5mm could satisfy seal request.Such decrement is that the compression percentages of the side of 4mm is 1.5/4=37.5% for thickness.This just causes applying bigger power or moment of torsion and reaches 37.5% the compression percentages that satisfies actual seal request, thereby makes the operation moment of torsion increase.
In order in the flap encapsulation process, the flap foundry goods accurately to be located, adopted the flap and the corresponding encapsulate technology of uniqueness as described below according to gate valve of the present utility model.Fig. 7,7A and 7B illustrate the flap 5 behind the encapsulate.Flap 5 comprises flap foundry goods 52, guiding footwear 53 (Fig. 7 C) and encapsulate layer 51.Only show two guiding footwear 53 among the figure, but its quantity and position be not so limited, and can be according to the practical application setting, as long as can position just passable to the flap foundry goods.Correspondingly, be provided with groove 521 in the both sides of flap foundry goods 52 to admit guiding footwear 53.As shown in the figure, guiding footwear 53 and groove 521 all are U-shaped and coupling substantially mutually.Should note leading footwear 53 and groove 521 can have other shapes of coupling mutually arbitrarily.Guiding footwear 53 can be formed by any materials that is suitable for sealing flap, preferably use injection molding.
Guiding footwear 53 have bottom surface 532 that engages with the engaging surface of the groove 521 of flap foundry goods 52 and the locating face 531 that engages with the positioning table 503 (referring to Fig. 8 A, 8B) of encapsulate mould 501 in encapsulation process.The thickness of guiding footwear 53 can be determined according to the thickness of the encapsulate layer for the treatment of encapsulate.
This locating face 531 is not less than the outer surface 511 of the encapsulate layer 51 behind (preferably being higher than) encapsulate, makes locating face 531 flush with the outer surface 511 of encapsulate layer 51 or outstanding slightly with respect to it.Like this, after being assembled to the flap behind the encapsulate 5 in the gate valve 1, this locating face 531 will contact with valve body 2 inner coated coatings.Because guiding footwear 53 are preferably used injection molding, not only can seal flap 5, and the also friction factor between direct and valve body 2 coated insides less than the outer surface 511 of encapsulate layer 51 of locating face 531 and the coefficient of sliding friction between valve body 2 coated insides of guiding footwear 53.So reduced the operation moment of torsion by the power of reducing friction.
Below with reference to Fig. 8 A and 8B encapsulation process according to flap 5 of the present utility model is described.Shown in Fig. 8 A, before encapsulate, the positioning table 503 of encapsulate mould 501 both sides separately, with plug 502 in die cavity 504 centralized positionings.Then, guiding footwear 53 are embedded in the groove 521 of flap foundry goods 52 both sides.Shown in Fig. 8 B, the guiding footwear 53 of flap foundry goods 52 and both sides embedding and secure fit are put into die cavity 504 together, and the positioning table 503 in the die cavity 504 directly is positioned on the locating face 531 of two guiding footwear 53.It is mobile that flap foundry goods 52 and guiding footwear 53 can not produced, thereby guarantee accurately to locate in encapsulation process.Therefore, guaranteed that the thickness of encapsulate layer 51 is even, satisfied the design thickness requirement.
Valve stem seal
As above described with reference to Fig. 1, general direct the fluting on valve rod placed O-ring seals in the existing gate valve.As shown in Figure 9, in according to gate valve of the present utility model, the valve stem seal pair 16 of multiple tracks combination comprises the assembly of O type circle 161 (2 road) and PTFE back-up ring 162 (2 road), and in the inner hole groove of the shaft-cup 8 of packing into.Shaft-cup 8 adopts the high-quality stainless steel to make, and internal groove employing precision machining, to guarantee the sealed groove size.O type circle 161 can be adjusted seal clearance according to the sealing load size automatically with PTFE back-up ring 162 in the groove of shaft-cup 8, make sealability more reliable.Because the PTFE material has good self-lubricating property, whole sealing pair 16 can not be subjected to corrosion and destruction, has so just prolonged the working life of sealing pair 16.
Self-align assembling
Shown in Figure 10 A and 10B, adopt unique hexagon socket countersunk flat cap head screw to connect valve body 2 with valve gap 3 and be connected valve gap 3 and shaft-cup 8 as attachment screw 10 according to gate valve of the present utility model 1.For example, for being connected of valve body 2 and valve gap 3, the top of the attachment hole of valve gap 3 has certain tapering, and the interior hexagonal tapering face of this tapering and attachment screw 10 cooperatively interacts.Like this, in assembly process, realize the automatic centering of valve body 2 and valve gap 3 and valve gap 3 and shaft-cup 8, thereby make valve body 2, valve gap 3 and the shaft-cup 8 of gate valve 1 to align well, guarantee quality of fit each other.Simultaneously also make things convenient for assembling, need not to assemble adjusting.
The utility model is not limited by the foregoing description, and can carry out multiple change and modification under the prerequisite that does not break away from spirit and scope of the present utility model.
Claims (15)
1. an inside screw non-rising stem type gate valve comprises valve body, is connected to valve gap, valve rod, flap and transmission device on the valve body, and the upper end of described valve rod is connected with transmission device, and the lower end of described valve rod is connected with flap,
It is characterized in that described valve rod is supported in the described valve gap rotatably by rolling bearing.
2. inside screw non-rising stem type gate valve according to claim 1 is characterized in that, described valve rod and described rolling bearing assemble according to dimensional tolerance range grouping pairing.
3. inside screw non-rising stem type gate valve according to claim 1, it is characterized in that, described transmission device comprises the cap transmission, the safety block that is used for the connecting sleeve that is connected with described valve rod and connects described cap transmission and described connecting sleeve that is used for being applied by the user operation moment of torsion, and described safety block disconnects the connection between described cap transmission and the described connecting sleeve when the moment of torsion that bears greater than predetermined torque.
4. inside screw non-rising stem type gate valve according to claim 3, it is characterized in that, described safety block comprises the top that links to each other with described cap transmission, the bottom that links to each other with described connecting sleeve and the intermediate portion that is connected the upper and lower, and the cross sectional area of described intermediate portion is less than the cross sectional area of described top and described bottom.
5. inside screw non-rising stem type gate valve according to claim 3 is characterized in that, the lower end of described connecting sleeve has the endoporus of non-circular cross sections, matches with the non-circular transverse cross-section with described valve rod upper end.
6. inside screw non-rising stem type gate valve according to claim 4 is characterized in that the upper and lower of described safety block all has non-circular cross sections, to match with the non-circular cross sections endoporus of the upper end of the lower end of described cap transmission and described connecting sleeve respectively.
7. inside screw non-rising stem type gate valve according to claim 3 is characterized in that, fastening piece passes the through hole in described cap transmission, described safety block and the described connecting sleeve and described transmission device is fastened to described valve rod.
8. inside screw non-rising stem type gate valve according to claim 1, it is characterized in that, described flap comprises flap foundry goods, guiding footwear and encapsulate layer, and described guiding footwear cooperation is installed in the groove of described flap foundry goods, in the process of described flap encapsulate described flap foundry goods is located.
9. inside screw non-rising stem type gate valve according to claim 8 is characterized in that, described guiding footwear has U-shaped.
10. inside screw non-rising stem type gate valve according to claim 8 is characterized in that, described guiding footwear has and the bottom surface of described engage grooves and the locating face that engages with the positioning device of encapsulate mould in encapsulation process.
11. inside screw non-rising stem type gate valve according to claim 10 is characterized in that, with respect to described bottom surface, described locating face is not less than near the outer surface of described encapsulate layer described guiding footwear.
12. inside screw non-rising stem type gate valve according to claim 1 is characterized in that, described gate valve also comprises the shaft-cup that is installed in described valve gap top, is provided with the Sealing of multiple tracks combination between described shaft-cup and described valve rod.
13. inside screw non-rising stem type gate valve according to claim 12 is characterized in that, described Sealing comprises O type circle and back-up ring.
14. inside screw non-rising stem type gate valve according to claim 1, it is characterized in that, connect described valve body and described valve gap by hexagon socket countersunk flat cap head screw, be used to admit the part in the hole of described hexagon socket countersunk flat cap head screw to have tapering in the described valve gap, cooperatively interact with tapering face with described hexagon socket countersunk flat cap head screw.
15. inside screw non-rising stem type gate valve according to claim 1, it is characterized in that, described gate valve also comprises the shaft-cup that is installed in described valve gap top, connect described valve gap and described shaft-cup by hexagon socket countersunk flat cap head screw, be used to admit the part in the hole of described hexagon socket countersunk flat cap head screw to have tapering in the described shaft-cup, cooperatively interact with tapering face with described hexagon socket countersunk flat cap head screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922200U CN201593622U (en) | 2009-12-24 | 2009-12-24 | Non-rising stem type gate valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922200U CN201593622U (en) | 2009-12-24 | 2009-12-24 | Non-rising stem type gate valve |
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| CN201593622U true CN201593622U (en) | 2010-09-29 |
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| CN2009202922200U Expired - Fee Related CN201593622U (en) | 2009-12-24 | 2009-12-24 | Non-rising stem type gate valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011075954A1 (en) * | 2009-12-24 | 2011-06-30 | 泰科龙(上海)管道有限公司 | Non-rising stem type gate valve |
| CN102588623A (en) * | 2012-02-10 | 2012-07-18 | 北京竺港阀业有限公司 | Non-rising stem gate valve rod and valve cover ball-type connection structure and application scheme thereof |
| CN102878350A (en) * | 2012-08-29 | 2013-01-16 | 铜陵艾纶纺织品有限责任公司 | Valve rod with positioning grooves |
-
2009
- 2009-12-24 CN CN2009202922200U patent/CN201593622U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011075954A1 (en) * | 2009-12-24 | 2011-06-30 | 泰科龙(上海)管道有限公司 | Non-rising stem type gate valve |
| CN102109044B (en) * | 2009-12-24 | 2015-06-17 | 泰科龙(上海)管道有限公司 | Non-rising stem gate valve |
| CN102588623A (en) * | 2012-02-10 | 2012-07-18 | 北京竺港阀业有限公司 | Non-rising stem gate valve rod and valve cover ball-type connection structure and application scheme thereof |
| CN102878350A (en) * | 2012-08-29 | 2013-01-16 | 铜陵艾纶纺织品有限责任公司 | Valve rod with positioning grooves |
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