SK91898A3 - Controllable ball valve - Google Patents

Abstract

The ball valve has shutter-type throttle element inserts (40,41). The first element is located on one side of the shut-off device (20) in the opening area of the passage (21), the second one is located on the other side of the device within the flow path (14') of a first housing part (12'). Both elements have parallel teeth defining flow gaps and projecting into the flow path in rotary direction of the shut-off device. In partially open position of the device up to approx. 60 degrees , the teeth form flow dividers.

Description

ADJUSTABLE BALL COCK

Technical field

SUMMARY OF THE INVENTION The present invention provides a controllable ball valve having a housing comprising at least two housing portions having a through hole, with a spherical shut-off member disposed within the housing between annular seals in which a through hole is formed and movable about the pivot axis

located perpendicular to the through hole from the fully open position in which the through holes in the housing portions and the through hole of the closure member are flush with each other to the closed position separating the through holes in the housing portions and to any throttling position between the open and closed positions; a second throttle element for reducing the pressure and reducing the noise of the shut-off member set to the throttle position.

BACKGROUND OF THE INVENTION

A controllable ball valve of this type is already known from WO 94/07063, in which a shut-off member is provided on the inlet and outlet side with a throttle element and these throttle elements have teeth projecting into the through-hole of the shut-off member. Likewise, throttling elements are disposed in the housing at the inlet and outlet sides immediately adjacent to the closing member with teeth equally protruding into the through hole, which in the throttling position cooperate with the throttling elements t of the closing member. One half of the closure member is also provided with bores formed obliquely to its through opening which, in the throttling position, bypassing the throttling point, allow the medium to flow from the through opening in the closing organ to the outlet side of the through opening of the housing.

In the known ball valves, their complicated construction is unsatisfactory, especially in relation to the shut-off member, in which the inlet and outlet side throttles are formed in one piece with the shut-off member in the form of sawtooth protrusions projecting into the through-hole of the shutter. In addition, when the throttling elements of the shutters interact

Turbulence arises from 000 / B bodies with throttle elements on the side of the housing, which is intensified by the outlet of the medium from the through-hole of the sealing member to the through-hole of the outlet side of the housing by additional oblique bores in the closing body.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the invention to provide a controllable ball valve which is characterized in comparison with a ball valve known according to WO 94/07063 by a simple construction, but which in the throttling position produces less noise immissions than in the prior art.

This object is achieved in that, in the adjustable ball valve according to the preamble of claim 1, the throttle elements are formed as inserts in the form of an orifice, the first throttle element being located on the side of the closing member in the mouth opening area and the second throttle element a shut-off ball adjacent to a through hole of one part of the housing, the throttle elements having teeth protruding in the direction of flow from the edge of the insert in the form of an orifice to create through spaces formed spaced parallel to each other in the direction of rotation of the shutter; in the partially open position of the closure member up to the open position, they form a flow divider at an angle of 60 ° C.

It is an object of the invention that in the area of the opening of the borehole passing through the closure member, an annular insert is provided as the first throttle element, which ensures a simple construction of the closure member. The second throttle member is also an annular insert which is mounted on the side of the shut-off member facing away from the first throttle member immediately adjacent it in the through hole in the housing.

The invention is characterized by the existence of only one first and second throttle element without further installation or additional through-holes through the shut-off member, so that only in the inlet and outlet areas

000 / B of the closing member, depending on its setting, there is a drop in the pressure of the flowing medium with little disturbance of the flow, and therefore a low noise.

Particularly in the open position of the closure member, there is no obstruction in the region of the orifice in the form of a diaphragm in which its teeth do not reach the interior, so that even with the throttling elements a high flow passage is ensured. In the closed position, on the other hand, the protruding teeth of the orifice-shaped insert act as a flow divider, which creates spaced gaps parallel to one another.

According to a preferred embodiment of the invention, the first throttle element located in the through hole in the closure body is located on the inlet side and the second throttle element located in the through hole of the housing part is then located on the outlet side of the closure member.

According to a further embodiment of the invention, the arrangement is designed such that the teeth of the first throttle projecting into the through hole in the closing body protrude from its edge in the closing direction of the closure member and the teeth of the second throttle projecting into the through hole of the housing part protrude against authority. The teeth of the two throttle elements thus project from the region extending above the half-circumference of the aperture-shaped inserts in the same directions both to the through-hole of the closure member and to the through-hole of the housing part.

According to another embodiment, the teeth of the throttle elements protrude into the through hole as a flow divider on a circle whose center is on the side facing away from the teeth. The radii of these circles are at most identical to the diameter of the flow path.

Due to this design of the protruding teeth of the throttle elements, the non-protruding tooth-free region permitting flow-free, formed lens-like and decreasing as the closure member turns to the throttling position and after this region of the tooth-free flow passage to complete disappearance of the element located in the through bore of the closing member pass through the adjacent seal, or through the edge of the closing member bounding the through bore, free ends pass

000 / B languages of the second throttle. Also in this operating position, a flow-free, turbulent and noise-free flow is provided through the interstices located parallel to each other.

According to another embodiment of the invention, the through holes formed by teeth projecting as flow dividers into the through hole have equal widths to each other. The passage gaps between the protruding teeth of the first throttle element may, however, also have a different, particularly smaller width than the passage gaps of the second throttle element.

An important further embodiment is that the second throttle element located in the through hole of the housing part is formed in one piece with a seal mounted axially movably and by means of elastic force pressed against the sealing member by the sealing surfaces. Thus, in this further embodiment, no additional sealing is required on the side of the closing member, but a second sealing element designed as an annular diaphragm simultaneously performs the function of the sealing.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further elucidated in the following examples by means of the accompanying drawings. In schematic views, FIG. 1 shows a longitudinal section along the section line I-1 shown in FIG. 1 shows a controllable ball valve according to the invention with throttle elements in the form of orifice inserts on the inlet and outlet side of the shut-off ball in the open position, FIG. 2 is a longitudinal section through an adjustable ball valve along section line II - II in FIG. 2, FIG. 3 is a front view of the adjustable ball valve according to arrow III in FIG. 1, FIG. 4 shows the insert forming the throttle element on the supply side as seen in FIG. 1, FIG. 5 shows the insert for the inlet side as seen in arrow V in FIG. 4, FIG. 6 shows an insert forming a throttling element on the outlet side as seen in FIG. 1

000 / B fig. 7 shows an insert for the outlet side as seen in arrow VII in FIG. 6, FIG. 8 shows a controllable ball valve in longitudinal section as in FIG. 2 with the closure member in a throttling position rotated about an axis of rotation relative to the open position by 45 °; and FIG. 9 shows a controllable ball valve in a front view as in FIG. 3, but with the shut-off ball in the throttle position rotated about an axis of rotation relative to the open position by 30 °.

DETAILED DESCRIPTION OF THE INVENTION

The ball valve 10 shown in longitudinal section in FIG. 1, consists of a housing 11 which consists of two housing parts 12, 12 'complementing each other in an approximately spherical shape. The two housing parts 12, 12 'are connected to each other by means of screws 13. The housing parts 12, 12' have mating through holes 14, 14 '. On the mutually opposite sides of the casing 11, tubular sections 15, 15 'with connecting flanges 16, 16' are welded to the casing parts 12, 12 ', which secure the installation of the ball valve 10 into a pipe guide (not shown).

Inside the housing 11, a closing ball 20 with a through bore is located as a sealing member between the seals housed in the parts 12, 12 'of the housing 11.

21. By means of the switching shaft 22, the shut-off ball 20 is adjustable about the pivot axis 23 to each intermediate position between the open position shown in FIG. 1 and 2, in which the through bore 2.1 is aligned with the through holes 14, 14 'in the housing portions 12, 12', with the closed position rotated relative to the open position by 90 °, in which the through holes 14, 14 'are separated from each other. The pivot axis 23 is formed perpendicular to the through bore 21 in the closure ball 20.

Fig. 8 and 9 show schematically the intermediate positions of the closing ball 20 when such a ball valve 10 is made from an open position to a closed position, or vice versa, in which the longitudinal axis of the through bore 21 is clamped relative to the through holes 14, 14 '. angle 45 ° or 30 °.

000 / B

The shut-off ball 20 is rotatably supported by bearing pins 24, 24 'located on opposite sides in the bearing bushes 25, 25' located in the housing 11. The switching shaft 22 extends through the sleeve extension 26 and is rotatably mounted therein. it is also sealed therein by means of a seal 27 with respect to the inner space of the housing 11 in which the shut-off ball 20 is mounted and is non-rotatably connected to the shut-off ball 20. An adjustment motor (not shown) which is non-rotatably associated with a switching shaft 22 or equally by means of a handwheel (not shown) which is mounted on the switching shaft 22 at an end opposite to the shut-off ball 20 and is rotatably connected thereto.

In the first part 12 of the casing 11 on the inlet side, a seal 30 is disposed in the first annular chamber 29 extending radially with respect to the first through hole 14 by this first part 12. The seal 30 is a known metal seal adjacent the sealing surface 31. adapted to a spherical shape, for the closure ball 20. On the side facing away from the closure ball 20, the seal 30 is supported on a disc spring 32, ensuring it is pressed against the closure ball 20.

Also in the second part 12 'of the downstream side casing 11, a further seal 35, formed in one piece with the throttle element 41 described below, is disposed opposite the second through hole 14' of the radially expanded second annular chamber 34. This seal 35 abuts the sealing surface 36 of another The ball-shaped seal 35 is adapted to the ball 20 and is also pressed against the ball 20 by means of a further disc spring 37, which is supported by a shoulder axially delimited by the second annular chamber 34.

The control ball valve 10 is provided with a throttle element 40, 4Ί on the inlet and outlet sides. These throttle elements 40, 41 are formed as orifice inserts and have teeth 44, 45 extending parallel to each other from the periphery of the annular body to form passage gaps 42, 43. These teeth 44, 45 protrude above half of the flow cross section and terminate on the intended a circle 46, 47 whose center 48, 49 lies on the side of the region 51, 52 of the aperture without teeth 44, 45.

000 / B

Ί

The first inlet-side throttle element 40 is disposed in a radial extension in the region of the opening of the through bore 21 in the closure ball 20 and has an outer shape adapted to a spherical shape. The teeth 44 on the outlet side protrude perpendicularly to the axis of rotation 23 of the closure ball 20 into its through bore 21, in the direction of rotation of the closure ball 20 when rotated in the direction of the closure position.

The second outlet side throttle element 41, which is formed in one piece with the other seal 35, is received in the second through hole 14 'of the second housing part 12' of the housing 11 directly on the closing ball 20. From the peripheral annular body, Fig. 7, teeth 45 on the exit side located in the second through hole 14 ' located to form the exit gaps 43 on the exit side are also parallel to each other, facing the direction of rotation of the shut-off ball 20 when manipulated to the closed position. The outlet-side teeth 45 terminate on a second circle 47 whose center 49 lies on the side of the orifice area 52 at the outlet without the outlet-side teeth 45. On the side facing the closure ball 20, the second throttle element 41 has a contour adapted to the shape of the ball 20.

Fig. 1 to 3 show the controllable ball valve 10 and stop ball 20 in the fully open position. In this working position, there is only insignificant influence on the free cross-section for flow. This is shown in particular in FIG. 3. When the shut-off ball 20 is rotated about the pivot axis 23 in the direction of arrow 53 to the closed position, it decreases with the closing of the area between the teeth 44 on the inlet side of the first throttle element 40 and the seal 30 on the inlet side. side, projecting into the second through hole 14 'of the second housing part 12' of the outlet side 11 and delimiting the through bore 21 passing through the shut-off ball 20.

In FIG. 8 shows the operating position of the shut-off ball 20, in which the orifice area 51 at the inlet side without teeth 44 on the inlet side of the first throttle element 40 is in a position rotated from the first through hole 14 of the first inlet housing 12; on the outlet side of the second throttle element 41 on the outlet side, the through bore 21 of the shut-off ball 20 is outside.

000 / B

Fig. 9 shows, by looking at the inlet side of the controllable ball valve 10, the intermediate position of the shut-off ball 20, in which the central teeth 44 on the inlet side of the first throttle element 40 still leave a free lenticular region of the passage cross-section.

Naturally, in such an operating position of the shut-off ball 20, the medium flows with considerable throttling through the through-flow gap 42, 43 formed between the projecting teeth 44, 45, and there is greater or less throttling depending on the setting of the shut-off ball. The inlet teeth 44 projecting into the through bore 21 in the shut-off ball 20 of the second throttle element 41 form flow dividers for only a brief division into a plurality of flow directions which result in static pressure reduction only in the immediate throttling region. ball valve 10.

Claims (8)

A controllable ball valve with a housing (11) comprising at least two housing parts (12, 12 ') having a through hole (14, 14') with a ball shut-off ball (20) located inside the housing (11). ) between annular seals (30, 35) in which a through bore (21) is formed and which is movably mounted about a pivot axis (23) positioned perpendicular to the through bore (21), from a fully open position in which they are aligned with each other the through holes (14, 14 ') in the housing parts (12 12') and the through hole (21) of the shut-off ball (20), to the closed position separating the through holes (14, 14 ') in the parts (12, 12) ') of the housing (11) as well as to any throttling position between the open and closed positions, and with the first and second throttling elements (40, 41) to reduce the pressure and reduce the noise of the closing ball (20) set to the throttling position, chokes (40, 41) they are formed as inserts in the form of an orifice, the first throttle element (40; located on the side of the closure ball (20) at the mouth of the through bore (21) and the second throttle element (41) located on the other side of the closure ball (20); adjacent to, in the second through hole 14 ') of the second part (12') of the housing (11), the throttle elements (40, 41) have teeth (44, 45) protruding in the flow direction from the edge of the insert in the form of an orifice the passage gaps (42, 43) formed spaced parallel to each other in the direction of rotation of the shut-off ball (20) and reaching over half of their cross-section, forming the shut-off ball (20) to the open position of the flow divider at 60 °. Adjustable ball valve according to claim 1, characterized in that the first throttle element (40) located in the through bore (21) in the closure ball (20) is located on the inlet side and the second throttle element (41) is located in the second a through hole (14) of the second part (12) of the housing (11) is located on the exit side of the closing ball (20). 31,000 / B Adjustable ball valve according to claim 1 or 2, characterized in that the teeth (44) on the inlet side of the first throttle element (40) projecting into the through bore (21) of the closing ball (20) protrude from its edge in the closing direction the closing ball (20) and the teeth (45) on the outlet side of the second throttle element (41) extending into the second through hole (14 ') of the second housing part (12') (11) protrude against the closing ball direction. Adjustable ball valve according to one of Claims 1 to 3, characterized in that the teeth (44, 45) projecting as a flow divider in the flow direction are terminated on a circle (46, 47) whose center (48, 49) it lies on the side facing away from the teeth (44, 45). Adjustable ball valve according to claim 4, characterized in that the radii of the circles (46, 47) on which the teeth (44, 45) of the throttle elements (40, 41) terminate are at most identical to the diameter of the flow path. Adjustable ball valve according to one of Claims 1 to 5, characterized in that the through-holes (42, 43) formed by the teeth (44, 45) projecting as the flow divider of the throttle elements (40, 41) into the flow path have the same width. Adjustable ball valve according to one of Claims 1 to 5, characterized in that the inlet gaps (42) on the inlet side between the projecting teeth (44) on the inlet side of the first throttle element (40) have a smaller width than the corresponding through gap (43). ) on the outlet side of the second throttle element (41). Adjustable ball valve according to one of the preceding claims, characterized in that the second throttle element (41) located in the second through hole (14 ') of the second housing part (12') is formed in one piece with a further seal (35), mounted movably and compressed by elastic force through the sealing surfaces (36) of another seal (35) on the closure ball (20).