DE1675549B2 - Shut-off and regulating valve - Google Patents

Description

The invention relates to a shut-off and regulating valve with a ^; n a straight valve housing with the aid of a valve closure piece rotatable relative to the housing longitudinal axis, which consists of a disc with a spherically curved sealing surface and a support part connected to the actuating shaft in a rotationally fixed manner.

If, according to FR-PS 12 32 779, the valve closure piece with the eccentrically mounted support part is rigid connected, occur in the last closing phase or in the first opening phase, possibly under high system pressure strong transverse displacements between the valve closure piece and the valve seat surface, which result in severe wear and tear and gradual leakage to have. Valves of this type are therefore only used for subordinate purposes, for example using check valves moderate tightness requirements, usable. This also applies if, according to US Pat. No. 25 56 904, the Valve closure piece is provided with an elastic sealing ring, especially since it is not only frictional wear, but also attack flow erosion and aging.

From Γ i g. 21 to 23 of FR-PS 12 26 460 is a valve of the type mentioned is known in which the valve closure piece is articulated to the support part is. Although this reduces the accuracy requirements in the manufacture of the valve; However the disadvantage remains that the valve closure piece remains in the last closing phase or first opening phase be moved transversely with respect to the valve seat surface with possibly considerable closing force got to. This valve can therefore only be used for subordinate purposes and in such special cases, in which the closure piece can often be removed and checked with regard to its condition.

It is known to avoid this disadvantage in that the valve closure piece is not by a simple one Rotary movement, but is brought into the closed position by a composite movement in such a way that its direction of movement in the last closing phase

or the first opening phase runs in the longitudinal direction of the valve. According to Fig. 1 to 14 of FR-PS 12 26 460 or according to US-PS 32 62 671 this can be achieved by eccentric control of the valve closure piece, which, however, is very complex.

The invention is therefore based on the object To create a valve of the type mentioned, which runs smoothly despite the simple and insensitive construction and low wear a good seal when closed under a variety of operating conditions allowed.

The solution according to the invention consists in the fact that the support part consists of a covering the entire length of the actuating shaft between the two housing bearings Hub and one or more rigidly connecting the disc of the valve closure piece with the hub, but in itself elastically flexible arm or arms is that at the end of a first phase of Closing movement punctiform contact between the valve seat surface and the opposite of the valve seat surface slightly inclined disc takes place and that in a second phase of the closing movement through elastic bending of the arm or arms a tight pressure of the disc against the valve seat surface lengthways of the entire scope.

The main difference in this solution and those known valves in which the valve closure piece can also be brought into the locked position by a simple twisting movement, consists in the fact that the valve closing piece is not by transverse displacement, but by pivoting around the Point of first contact with simultaneous elastic deformation of the arm or the holding it Arms closed.

From DT-PS 7 12 458 a valve with a centrally mounted rotary flap is known, the arms of which are elastic are designed to be resilient and press the valve closure piece into the seat opening through their spring force. During the closing movement, the closure piece drags over the edge of the under this spring force Valve seat in order to lock into the opening formed by the valve seat in the closed position. One such Valve can only be used for subordinate purposes because the closing force is limited to that Spring force, whereby this may only be small, so that the wear on the valve closure piece and on the valve seat remains within limits during the closing and opening movement and thus during the opening movement the valve disk can even jump out of the opening formed by the valve seat.

The invention is explained in more detail below with reference to the drawing, the advantageous Exemplary embodiments illustrated. In it shows

F i g. 1 at the end view,

F i g. 2 is a side view and

F i g. 3 shows a vertical section through a first embodiment of a valve arrangement,

F i g. 4 and 5 are sections along lines 4-4 and 5-5, respectively, of FIG. 3;

F i g. Figure 6 shows, on an enlarged scale, a partially sectioned side view of the valve assembly;

F i g. Figure 7 is a horizontal section through another embodiment of the valve assembly;

F i g. 8 shows a section according to line 8-8 of FIG. 7th dar;

Figures 9, 10 and 11 show a plan view, a side view and a perspective view of a Valve body;

12 and 13 are typical flow diagrams for known valve flaps and for rotary valves according to FIG about invention.

The in the F i g. 1 to 3 shown valve 20 is provided with power drive devices 21 and manual drive or override devices 22. The entire arrangement can be switched on as a unit between two sections 23 and 25 of a conveyor system for liquids or gases or a line. The line or the pipe sections 23 and 25 have corresponding flanges 24 and 26 which are connected to one another via the valve 20 in the usual way by means of a plurality of tie rods 27 which are screwed at the ends. Usual sealing devices (not shown) are provided between the ends of the valve 20 and the flange ends of the pipe sections 23 and 2ii. The valve housing 30 of the valve 20 preferably has a slotted part or fork part 31 which cooperates with one of the tie rods 27 to prevent rotation of the valve 20 relative to the line sections 23 and 25. The housing 30 of the valve 20 includes a valve chamber 32 with openings 33 and 34 at their ends, which represent the necessary flow connections between the chamber and the line sections 23 and 25. From one side of the valve housing 30, a tubular arm 35 protrudes outwardly along the axis BB , which is laterally offset from the longitudinal axis or flow axis AA through the valve housing. The arm 35 also extends into the chamber 32 and there forms an annular projection 36 which is axially aligned with an annular projection 37 on the opposite side of the valve chamber. An enlarged or radially extending annular flange 38 with a number of openings 39 spaced from one another is provided at the free end of the arm 35 for attaching drive devices 21 and 22, as will be described further below.

In the projections 36 and 37, the actuating shaft 40 is rotatably mounted in sleeves along the transverse axis BB and extends out of the flange end of the arm 35 which contains a suitable ring seal or packing 41 to prevent leakage from the chamber 32 along the shaft. An arm 42 has an opening 43 at one end, which is seated on the end of the arm 35, and a number of spaced-apart openings 44 corresponding to the openings 39 for attaching the arm to the flange 38 by means of bolts or screws 45, as in Fig. 3 and 5 can be seen. On the arm, a bearing cover, a bracket or the like for a bearing arrangement 46 is provided which rotatably supports that end of the shaft 40 which is opposite to the shaft end supported in the protrusion 37.

The other end of the arm 42 is connected in a suitable manner to the drive devices 21 which are shown in FIG shown example of a cylinder 47 of a motor operating in the axial direction with a piston 48 are formed, which is hingedly connected to one end of the valve actuating arm or lever 50 which is keyed onto the shaft 40 or otherwise connected thereto. Of the Axial motor 21 is preferably of the type that is expanded by hydraulic fluid and a Has return spring. The arm 42 also has a part 49 near the bearing assembly 46 (FIG. 6), which with Thread is provided or is designed as a nut and for the manual actuation devices or Übersteuerungseinrichiungen 2.2 serves.

The manual actuation or override devices 22 consist of a threaded spindle 52 with. Hand wheel 53 at one end. The spindle 52 is rotatable and axially movable in the nut part 49 against one Stop 51 at the end of the arm 50, which is located opposite the end connected to the piston 48. As 6 shows that the threaded spindle moves 52, when rotated, axially against stop 51,

iu whereby the arm 50 against the return spring of the Motor 21 around the axis ß-ß from its in solid The position shown in the lines is rotated in the direction of the position shown in dashed lines. if the threaded spindle 52 is rotated in the opposite direction, it moves away in the axial direction from the stop 51, it being followed by the arm 50 by now moving in the opposite direction the position shown in solid lines under the action of the return spring of the motor 21 rotates A lock nut 54 is on the threaded spindle 52 to secure against movement in a predetermined Position provided. A scale 55 and a pointer 46 are provided on the arm 42 and on the lever 50, a visible indication of the position of the

2 ^r > to grant valve body 60 of valve 20, which is of particular use when the threaded spindle 52 is to be set as a limit stop.

Referring to FIG. 4 it can be seen that the valve shut-off in this example is at the opening 33

ω is carried out, the stepped drilled and threaded is provided. A valve seat ring 57 with an outer ring shoulder is in the stepped bore through a Ring nut 59 held. The inner annular edge of the valve seat ring 57 is expedient for formation

) 5 machined a circular valve seat surface, the center of which lies on the longitudinal or flow axis AA and which in this case, but not necessarily,

is aligned with the valve chamber 32 and the opening 34.

From the F i g. 3 and 9 to 11 you can see that the Valve body 60 is of unitary, one-piece construction. At one end it forms the tubular hub 61, which is connected to the shaft 40 by means of splines or in some other suitable manner. The characteristic that they the same length as the shaft 40 between the two layers is used to axially fix it. A couple converging arms 62 extends from the ends of the hub 61 to the circular plate formed closure piece 64, which has a substantially rigid, spherical surface 65 at the other end of the

V) valve body 60 forms. The arms 62 are conical or shaped in some other expedient manner so that they form a portion 63 of reduced thickness near the closure piece 64, which is bendable and accordingly a certain angular displacement or tension of the valve

■> ■) plate enables the complete placement of the To enable spherical surface 65 on the valve seat surface 58 of the valve seat ring 57. The middle part of the spherical surface 65 is - as shown - preferably removed to be removed during actuation of the valve

ho 20 to be moved mass of the valve body 60 to decrease. The opening 34 has a larger diameter than the valve disk 64 or than the axial length of the Hub 61. The valve housing 30 can be constructed in one piece by the retraction of the shaft 40

ι ·, -. freed the valve body 60 from the valve housing 32 through the tubular arm 35 so that it can be removed through the opening 34.
To fully understand how the

valve according to the invention, a discussion of the geometry of the associated internal parts is required. As mentioned, the axis AA is the longitudinal axis or flow axis of the valve chamber 32 and the valve seat ring 57. The center of the circular area 58, which represents the inner end of the controlled opening, lies on the axis AA. The valve body 60 has a central axis CC through the closure piece 64 which essentially coincides with the axis AA when the spherical surface 65 is seated on the valve seat 58, as indicated by the position of the valve body 60 shown in dashed lines in FIG. 4 is indicated. As a result, the center of the spherical surface 65 lying on the central axis CC also lies on the flow axis AA when the valve body 60 closes the valve seat 57 with respect to the flow.

The transverse axis BB is the axis of rotation of the shaft 40 and the valve body 60 or the hub 61 of the valve body, which is connected to the shaft 40; this axis is offset from the center D of the spherical surface 65 along the axis CC in a direction away from the valve disk 64. The transverse axis BB is also arranged offset from the axes AA and CC in the closing direction of the valve body 60, which is directed substantially perpendicular to it and to the axes with respect to which it is offset. The center D of the spherical surface 65 therefore describes a curved path E when the valve body is rotated, so that the spherical surface 65 performs a rotation associated with axial movement or eccentric rotation relative to the valve seat surface 58.

The point P at which the surfaces 58 and 65 first touch, as shown in Figure 4, lies on the front of the locking piece 64 in the direction of its closing movement; thereafter, the axial component of the eccentric rotational force is exerted along the central axis CC via a lever arm DD . The axial force along the axis CC forces the closure piece 64 to pivot about the point P of the initial contact until the spherical surface 65 is fully seated on the valve seat surface 58. This pivoting or placement movement is made possible by the closure piece 64 by a limited bending in the parts 63 of reduced thickness of the arms 62; a metal-to-metal seal is achieved between hard or rigid surfaces. Similar functions in the opposite sense take place when the valve starts to open. At this point, the forces from the bending of the arm 62 force the locking piece 64 to pivot about the point of contact P so that the front of the surface 65 in the direction of opening movement lifts off the surface 58 and opens the valve seat 57 immediately the opening movement begins. The effective metal-to-metal seal between surfaces 58 and 65 of valve seat 57 and plug 60 eliminates the need for a deformable sealing member or extensive friction surfaces. There is also no dead gear or a movement of the valve body or the actuation devices beyond the shut-off point, and the flow restriction ends or begins immediately with the termination or with the start of the valve actuation.

The characteristic (flow rate / depending on the Valve opening) of a typical, conventional flap valve is represented by diagram 12.

It can be seen that some valve movement occurs before the flow begins. This is because that the valve body, an eccentric or a cam must be adjusted before the closure can ^r> piece stand out from the seat. Once the flow begins, the rise in flow is extremely rapid, as illustrated by the curve, while after sth; 25% of the valve movement, there is no longer any significant change in the flow rate. A

The corresponding diagram is shown in FIG. 13 for a Valve according to the invention shown. It follows without further ado that the current is directly involved the initial or final movement of the valve begins or ends and that the change in

i ^r > the flow rate in the smaller or initial valve positions is significantly less than when the valve body has moved a few degrees away from the controlled opening. It can also be seen that effective flow control is obtained over the entire range of valve travel.

A modified valve construction according to the invention is shown in FIGS. 7 and 8 shown. In this An example is a modified valve housing 70 with end flanges 71 for each independent connection

2 ¹ J with various pipe flanges 24 or 26 provided. The valve housing 70 forms a valve chamber 72 with end openings 73 and 74 corresponding to the chamber 32 and its openings 33 and 34 of the valve housing 30 of the above-described example. In

i ^{f |} In this modified construction, a tubular arm 75 has a conical hub part 76 which extends through a corresponding opening 77 of the valve housing 70 into the chamber 72 and therein an annular projection corresponding to the projection

i '> 36 of the example described above.

The arm 75 is provided with a flange 78 in the vicinity of the hub portion 76, which with the housing 70 by means Pins 79 or other suitable, known manner is connected. Suitable devices for sealing the connection between the housing 70 and the arm 75 to prevent leakage intended. An L-shaped support portion 80 extends from the hub portion 76 to the opposite side of the Chamber 72 and has an opening 81 in its> bent leg, which is in alignment with this at a distance from the hub 76 and the hub 37 in the above-described Example corresponds. In a manner similar to valve assembly 20, a shaft 40 is bushed in FIG Hub 76 and rotatably mounted in the bore 81 longitudinally

· ">(> Of the transverse axis BB. A valve body 60 is again appropriately attached to the shaft 40, as shown in the figures.

The opening 73, like the opening 33, is drilled in steps and cutouts to accommodate a valve seat insert

> ■> 82 with an outer ring shoulder that corresponds to the valve seat ring 57 and the ring nut 59 is held in the bore by means of an ring nut 84. the inner annular edge of the valve seat ring 82 is machined in a suitable manner to form a surface 83, which the

'· "Sealing surface 58 corresponds. The valve seat ring 82 forms again the inner end of the opening to be controlled, but in this case the sealing surface 83 is inside located on the wall surface of chamber 72; it works again in the same way with the spherical surface 65 of the eccentrically pivotable valve body to form a rigid metal-on-metal seal hard sealing surfaces together.

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Claims (1)

Claim: Shut-off and regulating valve with a valve housing with a straight flow through it an actuating shaft offset to the longitudinal axis of the housing and to the valve seat surface, rotatable valve closure piece, that consists of a disc with a spherically curved sealing surface and a support part connected to the actuating shaft in a rotationally fixed manner consists, characterized in that the Support part from a the entire length of the actuating shaft (40) between the two housing bearings comprehensive hub (61) and one or more of the disc (64) of the valve closure (60) arm or arms (62) that are rigidly connected to the hub but are elastically flexible in themselves consists that at the end of a first phase of the closing movement point-like contact between the valve seat surface (58.83) and the disc, which is slightly inclined in relation to the valve seat surface takes place and that in a second phase of the closing movement by elastic bending of the Arms or the arms a tight pressing of the disc against the valve seat surface along the entire Scope takes place.