CZ116098A3 - Valve - Google Patents

Abstract

A valve assembly (100) comprises a valve body (110) having a fluid flow passageway (112-114) in communication with the valve body cavity (116) in which is disposed a flow control member (118) for selectively closing or opening the fluid flow passageway. A valve operator (150) actuates a stem (120) connected to the flow control member by a connecting means which allows axial movement of the stem (120) but substantially no rotary movement between the stem (120) and the flow control member (118). The flow control member (118) comprises stop means (130) to arrest axial movement of the stem (120) towards the flow control member (118) in order to transmit the stem force to the flow control member (118) so as to provide a better sealing function in the selected valve position. A stem moving means (152) associated with the valve operator and the steam causes the stem (120) to rotate and reciprocate. The valve operator (150) selectively moves the flow control member (118) to a flow closed position or to a flow open position.

Description

Technical field

The invention relates to a valve assembly in which the flow control member is actuated by a rotatable and reciprocating spindle which is connected to the flow control member by means of a coupling means allowing the spindle to reciprocate relative to the flow control member.

BACKGROUND OF THE INVENTION

In the rotary valve, the shut-off member is rotated between the open and closed positions of the valve and the shut-off member is rotated by a spindle connected to the shut-off member. In the ball valve, the spindle only rotates and does not move reciprocally. In a rotary cone valve, for example a cone valve encased in a sleeve, the spindle also rotates and does not move reciprocally. In another kind of rotary cone valve, the cone is lifted from the valve seat and then rotated by a spindle integrally connected to the cone, which also reciprocates with the spindle. Thus, a cavity space must be provided within the valve for raising the cone. When this cone is repositioned in the valve seat, particles suspended in the fluid may be trapped between the cone and the valve seat, which compromise the integrity of the seal. Such a lift type can only be used for clean liquids without suspended particles and not for sludge and the like.

Many valves that are used today have integrity

72338 (72338a)

the seals are impaired by the wear of the sealing surfaces when the valve is used, and the valve begins to leak. The dead space of the cavity in the valve body contributes to the accumulation of debris in the cavity of the body. This is particularly disadvantageous for the sanitary use of the valve.

Above are some of the disadvantages of prior art valves that are currently in use. Thus, there is a need for a valve with a negligible cavity dead space in the valve body, a need for a valve automatically self-adjusting to wear of the sealing surfaces, and a need for a valve that can be used for both clean and suspended particulate fluids. Some prior art valves, such as ball valves, seal under the effect of fluid pressure, and the valve therefore rotates under the full fluid pressure exerted on it, and a large tear-off torque is required to rotate the closure member to the selected valve position. Thus, there is also a need for a valve that seals independently of the fluid pressure and a valve with less breakaway torque.

According to the prior art, only non-rotating valves with a reciprocating spindle are provided with back bearings which can be loaded with a variable external force to seal the passage of the spindle against the cavity of the valve body to prevent leaks. Until now, it has been considered difficult and difficult to implement a rotary valve stem to prevent leakage. A common way of retaining leaks in rotary valves is to apply a dynamic load to the spindle gland by means of a spring that provides a constant compression force on the spindle gland. The compression force on the gland is not automatically self-adjusting and only holds leaks, unlike preventing them.

• «·

Accordingly, there is a need for a rotary valve having a retracted spindle, by which the bearing force can be automatically self-adjusting according to wear of the sealing surfaces to prevent leaks, not just their retention, as in the case of a dynamic load.

SUMMARY OF THE INVENTION

The present invention relates to achieving a better sealing of a valve assembly operated by a rotatable reciprocating spindle.

The valve comprises a valve body comprising a body cavity and fluid passageways crossing the body cavity. A flow control member consisting of a rotatable member or a reciprocating member is disposed within the cavity of the body for selectively closing or opening the fluid passage. A valve actuating means is coupled to the flow control member for selectively moving the flow control member to the closed position or the open position. The valve actuating means comprises a spindle connected to the flow control member by means of a coupling that allows axial movement of the spindle relative to the flow control member but substantially does not permit rotational movement between the spindle and the flow control member. In other words, the coupling means is such that when the flow control member is in a stationary position, the spindle cannot rotate but can only move axially relative to the flow control member. Examples of such connecting means are grooves or tongue-and-groove connections such as a ball valve. The flow control member has a limiting means for stopping the axial movement of the spindle against the flow control member by which the force of the spindle is transmitted to the flow control member, thereby obtaining a better seal in the selected valve position.

A spindle movement means, such as a lift and turn mechanism, is coupled to the valve actuating means and the spindle, said spindle movement means moving the spindle in a sequence of steps that provide the axial movement itself away from the flow control member and then rotational movement. in response to movement of the valve actuator in one direction, and rotational movement and then axial movement itself against the flow control member in response to movement of the valve actuator in the other direction. Movement of the valve actuator in said one direction results in the flow control member being substantially relieved of the axial force of the spindle, and then the spindle is rotated to selectively move the flow control member, and movement of the valve actuator in said second direction results rotating the spindle to selectively move the flow control member, and then the flow control member is loaded with the axial force of the spindle to provide better sealing of the texutine flow through the passage at the selected valve position than when the axial force is not applied to the flow control member by the spindle.

In one embodiment of the present invention, the valve body has a spindle bearing surface surrounding the spindle passage communicating with the cavity of the valve body. The spindle passing through the spindle passage has a recess which fits snugly against the spindle bearing surface so as to seal the spindle passage against the valve body cavity to prevent leakage around the spindle.

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In another embodiment, the present flow control member is a hollow channel, the position of the fluid passage valve. The spindle movement means in the form of a lift, rotate and refit mechanism actuates the spindle in a sequence of steps which, in response to the movement of the valve actuator in one direction, provides axial movement alone away from the flow control member, then rotational movement, and then the axial movement itself against the flow control member. Said spindle movement means actuates the spindle in a sequence of steps which, in response to movement of the valve actuating means in the second direction, provides axial movement alone away from the flow control member, then rotational movement, and then axial movement itself against the flow control member. Thus, using the lift, turn, and refit mechanism for the spindle movement means, the fluid passage can be sealed against the valve body cavity, if necessary, in the closed position of the valve as well as in the open position of the valve.

In the present invention, the spindle is reciprocating relative to the flow control member, but the flow control member does not need to reciprocate with the spindle when the spindle moves away from the flow control member. Thus, the housing can be positioned very close to the top of the flow control member in the valve assembly so that the dead space of the cavity in the valve body is minimized. This is particularly important for sanitary use of the valve assembly. Thus, the present invention discloses a new valve in which the flow control member is not lifted from the valve seat, thereby allowing the valve to be used to handle pure fluids as well as fluids containing particles in suspension, eg sludge.

The flow control member is provided with a pivot at the bottom to maintain the seal independently of the fluid pressure. Without the pin, the pressure acting on the flow control member assists the sealing function, but the breakaway torque increases. On the other hand, when the pivot flow control member is not loaded by an axial force by the spindle, the sealing load on the seat in the downstream direction is considerably reduced and the tear-off torque for rotating the flow control member is also reduced.

In the ball valve, the ball rotates under full pressure acting on the downstream seat. Therefore, the pivot flow control member according to the invention has a lower breakaway torque than the ball valve.

The restriction means of the flow control member of the present invention stops axial movement of the spindle against the flow control member, thereby transmitting the spindle force to the flow control member so as to provide a better seal in the selected valve position. The valve actuator moves reciprocally through the spindle, and when the sealing surfaces are worn, it must travel somewhat further towards the flow control member to maintain effective sealing of the spindle. The valve actuating means not only provides this additional spindle path, but also automatically adjusts the spindle force required to maintain the integrity of the seal.

The present invention represents a very simple concept of a valve operated by a reciprocating and rotating spindle. It represents a new application of the spindle movement means, such as a lift and turn mechanism, and its new concept. The idea of this concept is that by using a restraining means to stop the axial movement of the spindle against the flow control member, the flow control member can be loaded with additional force if needed for better sealing, and the valve actuator automatically provides the necessary the external variable spindle force that the flow control member loads. Thus, the coupling means between the spindle and the flow control member is a one-way clutch system by which the spindle force is transmitted to the flow control member in one direction of the spindle movement, and in the opposite direction of the spindle movement the flow control member is unloaded by the spindle force. the breakaway torque required to move the flow control member to the selected valve position.

It will be understood that the flow control member of the present invention may be of the rotary or reciprocating type. That is, the flow control member is located in the cavity of the valve body either rotatably or reciprocally between the open and closed positions of the valve. In the rotary valve, the rotational movement of the spindle is transmitted directly to the rotational movement of the flow control member. In the reciprocating valve of the present invention, there is a coupling means between the spindle and the flow control member, which includes means by which the rotational movement of the spindle is converted to the reciprocating movement of the p-axis 7, e.g. pinion, or arrangement of a Scottish yoke with a pin.

For example, in a traditional wedge-valve, the slide is reciprocating along the spindle axis, thereby moving the sealing surface of the slide away from the valve seat surface. However, in a reciprocating wedge-shaped valve constructed in accordance with the present invention, the wedge-shaped slide is reciprocating in a direction transverse to the spindle axis. As a result, the sealing surface of the wedge-shaped slide does not move away from the bearing surface of the valve body, but slips along the backward axis of the spindle axis along the spindle axis.

99 planes of the valve body. This represents a sort of scraping function of the slide and valve seat, which allows the use of the valve by the wedge slide according to the invention for handling liquids containing particles in suspension, eg sludge.

In a traditional wedge-valve, in which the wedge-valve is reciprocating along the spindle axis, the particles in suspension in the sealing surfaces when the valve rests against the valve seat, thereby losing the integrity of the seal. Therefore, a traditional wedge valve cannot be used for sludge.

On the other hand, the wedge gate valve constructed in accordance with the present invention can be used for sludge.

It is an object of the present invention to provide a valve in which the spindle is reciprocating relative to the flow control member, and where the spindle force is transmitted to the flow control member, and to provide a better seal in the selected valve position.

Another object of the present invention is to provide a valve that is automatically self-adjusting to the wear of the sealing surfaces to maintain the integrity of the seal.

Another object of the present invention is to provide a valve with negligible dead space in the valve body.

Another one goal of the invention is to create them valve with smaller detachable momentem. Another one goal of the present invention is create valve,

which can be used to handle pure fluids as well as particles in suspension.

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Other objects and advantages of the present invention will become apparent from the following detailed description when taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings presents

Fig. 1 elevation of the rotary cone valve according to the invention partly in section, Fig. 2 in section partial detail of reciprocating a wedge gate valve according to the invention, and Fig. 2A a partial detail of the valve of FIG. 2 in cross section along line 2A-2A showing the valve in the closed position.

DETAILED DESCRIPTION OF THE INVENTION

Referring to Fig. 1, a valve assembly 100 including a pivot cone formed in accordance with features of the present invention is illustrated.

The valve body 110 includes fluid passages 112 and 114 on opposite sides of the valve body cavity 116, which is open on one side of the valve body 110 and adjoins the cover 142 from above.

Flow control element assembly 118 including φφ ΦΦ ** MM · 4 • 9 Ν · 4 · · 4 4 4 4 4 «φ φ φ φ φ φ φ φ * * * *

The tapered conical closure member 119 is disposed within the cavity 116 and opens or closes the fluid flow through the passages 112 114. The valve body 110 is lined with an elastomeric sleeve. 134 with fluid flow apertures around fluid passages 112-114 with which cone 119 is in close contact.

The flow control member 118 is rotated by a valve actuator 150 that includes a spindle 120 extending through the spindle passage 121 in the housing 142. The spindle passage 121 communicates with the body cavity 116 and has a spindle receiving ring 132 disposed around the spindle passage 121. The upper end 123 of the spindle 120 is connected to the valve actuating means 150 by a spindle movement means 152 by means of which the spindle 120 rotates and reciprocates along the spindle axis. The lower end of the spindle 120 has an enlarged end 125 in the form of a sleeve with grooves 122 on the inner diameter. The cone 119 has at its upper end a rigid shaft with grooves 124 on the outside diameter. The female spindle grooves 122 engage the male cone grooves 124, allowing axial movement of the spindle 120 relative to the flow control member 118. The spindle 125 has a spindle sealing surface 128, also called a spindle retention, which is a spindle mounting surface 132 to prevent leakage in tight contact. It should be noted that the male and female grooves 124 and 122 in Figure 1 may be interchanged.

Leaks occur when fluids in the valve body cavity 116 run around the spindle. The seal cover 138 exerts a compression force on the spindle seal 140 surrounding the spindle 123 thereby maintaining an effective seal around the spindle, thereby sealing the spindle passage 121 against the valve body cavity 116.

The spindle movement means 152 is in the form of a lift-turn-reseat mechanism, and sets the spindle 120 in motion in a sequence of steps that provide axial movement alone away from the flow control member 118, then rotational movement, and then axial movement itself a flow control member 118 as the valve actuator 150 moves in one direction. As the valve actuating means 150 moves in the opposite direction, the spindle moving means 152 actuates the spindle 120 in a sequence of steps that provides axial movement alone away from the flow control member 118, then rotational movement, and then axial movement alone against the control member 118. flow. The top surface 130 of the cone 119 acts as a stop to stop the further axial movement of the spindle 120 against the cone 119, so that it transmits the spindle force to the cone 119 when the bottom surface 126 of the spindle 125 engages the top surface 130 of the spindle 119. of cone 119. the cone 119 is not loaded by the spindle force and therefore less torque of the valve actuator 150 is sufficient to rotate the cone 119.

When the valve actuating means 150 moves in one direction to open the valve, the spindle 120 only moves radially away from the cone 119, thereby relieving itself from the force of the spindle, then the spindle 120 rotates with the flow control member 118 a predetermined circle segment. in this case, by 90 degrees, to open the fluid passages 112-114 by connecting the channel 113 in the cone 119 to the fluid passages 112-114. As the valve actuating means 150 continues to move in a direction coincident with the valve opening direction, the spindle 120 moves only axially in the opposite direction against the cone 119 until the lower surface 126 of the spindle 125 abuts the cone limiting surface 130 so as to transfer the force of the spindle to the cone 119 an additional load on the cone 119 to achieve a higher sealing integrity than when the spindle does not transmit force to the cone. Thus, the fluid passages 112-114 are sealed against the valve body cavity 116 in the open position of the flow control valve member 118.

When the valve actuating means 150 moves in the opposite direction to close the valve, the above-described spindle movement sequence is repeated. That is, the spindle 120 is displaced only axially from the cone 119 to relieve the cone from the axial force of the spindle, then the spindle is rotated 90 degrees along with the cone 119, and then the spindle 120 only moves axially against the cone 119 until the spindle surface 126 abuts on the cone limiting surface 130 so as to transfer the force of the spindle to the cone 119 to close the fluid passages 112-114 tightly in the valve closed position. The cone 119 carries a pin 136 underneath, by means of which the sealing function is ensured independently of the fluid pressure. The fluid pressure, however, assists the sealing function by pressing the cone against the countercurrent portion of the seat surrounding the fluid passage.

The fluid passage 112-114 is sealed from the valve body cavity 116 in the valve open position as in. . _ _ _T .. ^v . - X - _{Λ _} ____4_ -I _, _ 1 1, x Ί v-,,, -ι-n _ y. This sealing is achieved by using the lift and turn mechanism ¹ 'in the spindle movement means 152. The spindle movement means 152 that moves the spindle in a sequence of steps that provide only axial movement away from the cone 119, then the rotational movement, and then the axial movement itself against the cone 119, is generally called the lift, rotate and reposition means. The spindle movement means 152 that moves the spindle in a sequence of steps that only provide axial movement away from the cone and then a rotational movement is generally referred to as a lift and turn means. How to clamp

134 wear, the spindle 120 needs to be moved a little further • ·

against the cone 119 to provide an effective seal, and the valve actuator 150 automatically provides the external variable spindle force needed to ensure the integrity of the seal. An example of a spindle movement means in the form of lift-turn-reseat and lift-turn is explained in detail in US Patent No. 5,407,176, April 18, 1995 to Nevrekar. Other examples of lift-turn-reseat means include: US 2,392,880, January 15, 1946, Reed; U.S. 2,443,995, Jun. 22, 1948, Snyder; U.S. 2,501,150, Mar. 21, 1950, Anderson; U.S. 2,795,960, June 18, 1957 to Heinen; No. 2,858,097, issued October 28, 1958 to Blomstran. Other examples of lift and turn means include: US 2,076,841, April 13, 1937 to Heggem; U.S. 2,383,549, issued August 28, 1945 to Hilker; U.S. 4,234,157, issued December 18, 1980 to Hodgeman; U.S. Pat. No. 5,342,028, issued Aug. 30, 1994 to Nevrekar.

The valve body 110 of Fig. 1 is shown lined with an elastomeric sleeve 134. However, seat rings in the valve body or simply sealing rings on the cone 119 may also be used. The spindle 125 is connected to the cone 119 by a coupling which allows axial movement of the spindle

rotational movement between the spindle 125 and the cone 119. In other words, the connecting means between the spindle 125 and the cone 119 is such that when the cone 119 is in a stationary position, the spindle 125 cannot rotate but can only move axially relative to the cone 119.

The flow control member 118 shown in FIG. 1 is a tapered cone. It will be appreciated that the flow control member may be any other type of closure member for which an additional spindle force is beneficial to achieve a higher seal integrity than without using a spindle force, e.g.

Segment · uzav uzav 4 segment uzav segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment segment providing a sealing member with wedge segments, or a member that uses the wedge principle by mechanical means.

Thus, the flow control member may comprise a reciprocating wedge-shaped gate valve formed in accordance with features of the present invention. In this construction, by means of a wedge-like closure means, the rotational movement of the spindle by means between the spindle and includes means which it converts to the reciprocating movement of the wedge-shaped gate valve in a direction perpendicular to the axis of the spindle. Thus, the present invention can be used for a reciprocating slide, wherein the control member is a wedge-type shut-off valve, the valve is reciprocably movable in the direction of the flow slide, formed as in a cavity of the body transverse to the spindle axis.

Grooves 122, 124 on the inside of the housing 142.

outside the housing 142, above the spindle seal cover 138, thereby spindle travel in the spindle seal 140 and thereby the life of the spindle seal.

Fig. 1 are shown in position

However, these grooves could be displaced with shortened elongates

According to the prior art, in a traditional shut-off member formed as a wedge-shaped valve with a shut-off valve or tapered cone utilizing a spindle lift mechanism along a rotationally loaded axle, the spindle reciprocates the flow control member alternately unloaded by the spindle force. The flow control member also reciprocates, in agreement with the spindle, making it unsuitable for use on liquids with particulate in suspension. The present invention shown in FIG. 1 retains the good properties of the prior art, and in sharp contrast to the prior art, the control member 118 is a control member.

The flow rate of the present invention does not move reciprocally with the spindle 120, but the spindles alternately but reliably are loaded with the spindle force and relieved of the spindle force during the reciprocating movement.

This represents an important difference between the present invention and the prior art.

FIGS. 2, 2A illustrate, for brevity, only important details to illustrate how the rotational movement of the spindle is converted to the reciprocal movement of the flow control member in a direction transverse to the spindle axis.

The valve assembly 200 with a reciprocating wedge gate valve comprises a valve body 210 and a cover 242 through which the lower end 225 of the spindle extends into the cavity 216 of the body. The flow control member assembly 218 includes two segments 219 and 210.

which are wedged against each other and are floating connections.

The springs (not shown) retained in the flow control member 218 are disposed within the body cavity 216 and reciprocally move in a direction perpendicular to the spindle axis for selectively closing or opening the passage 212-214. The spindle 225 has grooves 222 on the outside diameter.

The slots 222 engage slots on the inner diameter of the pinion 226 and allow the spindle 225 to move along the spindle axis relative to the flow control member 218 to a position where the lower surface 228 of the spindle 225 abuts the upper surface 230 of segment 219. the spindle force on the flow control member 218. As the spindle 225 rotates, the pinion 226 rotates with the spindle and the toothed rack 224 of the flow control member segment 220, thereby causing the flow control member 218 to reciprocate in a direction perpendicular to the spindle axis as shown in FIG. 2A. Obviously, the member

The flow control 218 may consist of only a single segment

219 instead of the two segments 219, 220, in which case the toothed rack 224 would be located on the segment 219. Various variants of the toothed rack and pinion arrangement are possible. For example, a rack. 224 may be linear or curved, and the corresponding shape may have a flow control member, along with the body cavity and valve seat.

The tapering angle of the cone 119 in Fig. 1 and the wedge angle in Fig. 2 is particularly important for releasing the wedge with the valve seat after the spindle axial force acting on the flow control member 118, 218 is relieved by the distance of the spindle from the flow control member. This angle must be greater than the resting angle of the material used. Choosing the optimum angle for a flow control member requires extraordinary expertise in the subject and goes beyond the general practitioner's understanding.

The present invention is applicable to a valve in which the flow control member consists of a rotatable member or a reciprocating member and loaded with additional spindle force to achieve a better seal than when the spindle force is not applied and the spindle movement means transmits the force

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additional force is required.

It will be apparent from the above description that the invention accomplishes the objects and achieves the results and advantages of the invention as well as the invention. Although, for the sake of clarity, a preferred embodiment has been described, numerous changes can be made to one of skill in the art within the spirit of the disclosed invention as defined by the claims.

Represented by:

Dr. Miloš Všetečka v.r.

JUDr. Milos Všetečka advocate

120 00 Prague 2, Halkova 2

Claims (9)

PATENT CLAIMS Valve comprising: a valve body having a fluid passage defining a fluid passage therethrough crossing the body cavity; flow control disposed within the cavity of the selective closure body and fluids; means for opening a passage valve actuating device associated with a flow control means, comprising: valve actuating means; a spindle by means having a spindle control axis and associated with said means, a flow which, by means of a coupling relative to the means for axial movement of the spindle, permits flow control but substantially does not permit rotatable flow control means; movement between the spindle means for moving the spindle connected to the valve actuating means and to the spindle, the means for moving the spindle moving the spindle in a sequence of steps that provide the axial movement itself away from the flow control means and then rotating in response in one direction, and rotational movement and then axial movement itself against the flow control means in response to the movement 16 72337 (72337a) • «I ··· ♦ valve actuating means in the second direction; and a restraining means disposed on the flow control means for stopping the axial movement of the spindle against the flow control means, thereby transmitting the spindle force to the flow control means, the movement of the valve actuating means in said one direction substantially reducing the flow control means from the axial spindle force and then spindle rotation, and movement of the valve actuating means in said second direction results in spindle rotation and then loading of the flow control means with axial spindle force to obtain a better sealing function in the selected valve position than when the flow control means is not a spindle no axial force exerted. Valve according to claim 1, characterized in that said means for moving the spindle moves the spindle in a sequence of steps providing itself an axial movement away from the flow control means, then a rotary movement, and then the axial movement itself against the flow control means in responsive to movement of the actuating means in said one direction. 3. The valve of claim 1, wherein said means for moving the spindle moves the spindle in a sequence of steps to provide the axial movement itself away from the flow control means, then a rotational movement, and then the axial movement itself against the flow control means. responsive to movement of the valve actuating means in said second direction. The valve of claim 1, wherein the flow control means further comprises a pin on the valve body rotatable about a spindle axis located on the side of the flow control means facing away from the spindle. The valve of claim 1, wherein the flow control means further comprises a hollow channel connectable to the fluid passage in the valve body. 6. The valve of claim 1, wherein the spindle movement means further comprises lifting and rotating means for moving the spindle only axially during a limited movement interval of the valve actuating means and for moving the spindle to rotate during the movement time of the valve actuating means. out of limited interval. The valve of claim 1, wherein the flow control means further comprises a cone rotatably positioned within the cavity of the valve body. Valve according to claim 1, characterized in that the valve body further comprises. a spindle passage communicating with the body cavity, a spindle bearing surface surrounding the spindle passage, and a spindle passing through the spindle passage; for controlling the flow, whereby the valve control means automatically provides a self-adjusting and externally variable spindle force to seal the spindle passage against the cavity of the valve body. 9. The valve of claim 1, wherein the coupling means between the spindle and the flow control means further comprises means for causing the flow control means to reciprocate in a direction transverse to the spindle axis in response to the rotational movement of the spindle. The valve of claim 1, wherein the coupling means between the spindle and the flow control means further comprises a rack and pinion arrangement between the flow control means and the spindle.