Source: http://www.allindianpatents.com/patents/205438-gate-valve
Timestamp: 2019-06-19 23:23:16
Document Index: 221181811

Matched Legal Cases: ['art 10', 'art 11', 'art 11', 'art 10', 'art 13', 'art 14', 'arts 10', 'arts 10', 'art 10', 'art 11', 'art 10', 'art 11', 'art 13', 'art 14', 'art 17', 'art 17', 'art 25', 'art 25', 'art 10', 'art\n10', 'art 13', 'art 14', 'arts 10', 'art 11', 'arts 25', 'art 11', 'art 10', 'arts 27', 'art 13', 'art 14', 'art 11', 'art 17', 'arts 10', 'art 60', 'art 60', 'art 61', 'art 10', 'art 11', 'art 13', 'art 14', 'art 11', 'art 13', 'art 10', 'art 13', 'arts 11', 'arts 10', 'arts 10', 'art 14', 'art 13', 'art 13', 'art 10', 'art 11']

Indian Patents. 205438:"GATE VALVE"
A gate valve having a housing comprising a bottom part (10) and a top part (11) separated by a flange connection (12); a first side part (13) comprising a housing inlet and a second side part (14) comprising a housing outlet; clamping connections between said first side part (13) and the bottom and top parts (10, 11) and between said second part (14) and the bottom and top parts (10,11), respectively; and a sealing insert (15) clamped between said bottom part (10), said top part (11) and the said first and second parts (13, 14); and a sliding member adapted for sliding movement in said housing between a first position in which it establishes a gate barrier between said inlet and said outlet and a second position in which said gate barrier is removed, said sealing insert (15) having an opening (5) opposing said inlet and said outlet, and further having a contact area (9) adapted for sealing contact with said sliding member (6) during said member's sliding movement between said positions, said sealing contact establishing said barrier when said sliding member (6) is in said first position, said gate valve being characterized in that: the sealing insert (15) comprises a rigid body (31) permanently connected to areas (32) having less rigidity than said rigid body (31), said areas (32) with less rigidity including said contact area (9) and clamped areas (18) in said flange connection (12) and areas (19) claniped between said first side part (13) and the bottom and top parts (10,11) and between said second side part (14) and the bottom and top parts (10,11).
Danfoss Esco AS, a company incorporated in Norway having its Registered Office at Gamle Gomsrudvei 40, N-3612, Kongsberg, Norway.
A gate valve of this kind is known from US 2,934,313. The gate valve shown here has a four-part housing with a housing bottom part, on which a housing cover is fixed with bolts. On two sides facing each other, the housing bottom part and the housing cover form circular openings, each having a thread. A pipe body with a mating thread can be screwed onto each of the two threads. All four parts form a flow pipe. The flow cross-section of this pipe can be closed by a sliding element, which can be lowered from the housing cover transversal to the flow direction of the flow pipe. For sealing the touch areas between the housing parts and the contact areas between the sliding element and the housing, the gate valve has a sealing insert made of rubber. The sealing insert has a tubular shape. Inside the sealing insert, the flow cross-section is substantially limited by metal rings, which are inserted in the sealing insert. The metal rings serve the purpose US 5,279,320 shows a gate valve with a sliding element, which has a groove on each side. When opening and closing the gate valve, the sliding element will be guided via the grooves through corresponding tracks on the gate valve housing. The sliding element has a plastic-coated core. In the area of the grooves, the coating of the core is made of a hard polymer material to reduce the friction. In the remaining areas, in which the sliding element bears on the housing in the closed state, the coating consists of a soft polymer material. This ensures a good sealing.
The invention is based on the task of improving the reliability of a gate valve, in that it provides a gate valve having a housing which comprises a bottom part and a top part separated by a flange connection; a first side part comprising a housing inlet and a second side part comprising a housing outlet; clamping connections between said first side part and the bottom and top parts and between said second part and the bottom and top parts, respectively; and a sealing insert clamped between said bottom part, said top part and the said first and second parts; and a sliding member adapted for sliding movement in said housing between a first position in which it establishes a gate barrier between said inlet and said outlet and a second position in which said gate barrier is removed, said sealing insert having an opening opposing said inlet and said outlet, and further having a contact area adapted for sealing contact with said sliding member during said member's sliding movement between said positions, said sealing contact establishing said barrier when said sliding member is in said first position. The invented gate valve is characterized in that the sealing insert comprises a rigid body permanently connected to areas having less rigidity than said rigid body, said areas with less rigidity including said contact area and clamped areas in said flange connection and areas clamped between said first side part and the bottom and top parts and between said second side part and the bottom and top parts.
It must be stressed that the term "sealing insert" describes an individual element, which can also be handled independently of the other components of the gate valve. The additional area partly also accomplishes a sealing function and can thus, for convenience, also be called sealing area.
The rigid body makes it possible to give the sealing insert almost any desired shape and size, without requiring stabilisation through additional supporting arrangements. For example, a sealing insert of this kind can also have large openings or a tubular shape, whose free cross-section is kept open by the rigidity of the sealing insert. Thus, it is possible to use a large variety of sealing insert shapes. The sealing inserts can also have relatively complex shapes. This newly acquired freedom in the use of sealing inserts now makes it possible to develop large inner areas of the gate valve by means of a corresponding sealing insert. In this connection a material can be used for the sealing insert, which is more easily and accurately workable than the housing of the gate valve. In this way, different areas of the gate valve can be made with a higher accuracy and also more easily. Especially in areas, which cooperate with the sliding element, this improved accuracy is a large advantage. Exactly here, the sealing insert can give an improved sealing and a reduced material wear. The remaining areas can still be made of robust materials, like for example cast. Further to the exact shapability of the sealing insert, the additional area with the reduced rigidity can also provide a good sealing in
desired areas. It is no longer required to provide separate sealings. On the contrary, a sealing is formed by sections or areas of the additional area with reduced rigidity, which forms one unit with the more rigid body. Additionally, the one-unit embodiment of the rigid body and the additional area causes a substantial simplification of the assembly. Further, the permanent connection ensures improved sealing properties of the sealing insert. The connection may, for example, be achieved through bonding.
Further, it is favourable that the rigid material component is made of polyoxy methylene (POM). The use of this plastic material enables a high degree of accuracy during production of the sealing insert. A subsequent working of a sealing insert made of this plastic material can be limited to a trimming.
In a further advantageous embodiment, a filling material is arranged between the sealing insert and the housing. Through the use of such a filling material, the retaining of the sealing insert in the housing can be optimised. Thus, possible deformations of the sealing insert during operation can be reduced. Further, the filling material provides a
good sealing between the sealing insert and the housing, so that here slack water cannot gather.
It is particularly favourable that the sealing insert has a guiding part, in which the sliding element can be guided. In this way also the areas of the gate valve cooperating with the sliding element can be made relatively accurately. Thus, a good sealing and a low material wear can be achieved.
It is advantageous that the guiding part branches off from the remaining sealing insert into a control area in the top part of the housing, in which the sliding element is arranged in the open state. Thus, it is achieved that in any position the sliding element is guided by the guiding part over a long distance. Further, in this way, the total area, in which the sliding element is moving, can be formed by the sealing insert. As a result, • this gives a particularly exact guiding of the sliding element and a good sealing.
It is particularly preferred that the additional area covers at least 50% of the surface of the rigid body, which gets in touch with water. Thus, on the major part of the surface the additional area ensures that the flowing water does not release glass fibres from the rigid bpdy. Thus, the sealing insert is also suited for drinking water.
Fig. 8 an enlarged sectional view "X" from Fig. 7,
Fig. 9 an exploded view of the sealing insert according to Fig. 6
Also here, the housing 2 of the gate valve 1 has an inlet 3, an outlet 4 and between them a flow area 5. The housing 2 is built up of four housing parts. The flow area 5 is surrounded by a bottom part 10 and a top part 11, which are connected with each other in two sections via a flange arrangement 12. When dismounting the top part 11 from the bottom part 10, the flow area 5 is thus freely accessible, for example for cleaning or control purposes. Further, an inlet part 13 and an outlet part 14, respectively, are arranged at the inlet 3 and the outlet 4. All housing parts 10,11,13,14 are made to be corrosion resistant. This means that they have a corresponding surface coating or that they are made of a suitable material. As surface coating, epoxy resin is suited.
Further, a good retaining of the sealing insert 15 in the housing 2 is achieved by means of clamping areas 18,19. In the present embodiment, these are made by means of clamping lips 18 and clamping collars 19. In the assembled state of the gate valve 1 shown here, each clamping area 18,19 of the sealing insert 15 is clamped between two or three housing parts 10,11,13,14 of the housing 2. Here, the clamping of the clamping lips 18 occurs in the flange arrangement 12 by means of a flange surface 20a, 20b on the bottom part 10 and the top part 11, respectively. The clamping collar 19, however, is clamped in a groove 21, which is made in both the bottom part 10 and the top part 11 in the area of the inlet 3 and/or the outlet 4. Together with the clamping collar 19, a mounting collar of the corresponding inlet part 13 or outlet part 14 is arranged in the groove 21. After the assembly, this mounting collar 22 presses on the clamping collar 19, which is thus clamped between the mounting collar 22 and an inner groove wall 23.
Further, the guiding part 17 of the sealing insert 15 has a guiding device 24. Via this guiding device, the sliding element 6 is guided during displacement. The guiding device 24 of the guiding part 17 cooperates with a guiding counter-part, which is arranged on the sliding element 6. In the embodiment shown, this guiding counter-part 25 is made of approximately rectangular projections, which are arranged on both sides of the sliding element 6. Of course, it is also possible for the guiding device 24 and the guiding counter-part 25 to have any other known and suited shape.
When assembling the gate valve 1, the sealing insert 15 is first placed in the bottom part 10 of the housing 2. The clamping lips 18 and the clamping collar 19 are arranged at the flange surfaces 20a, 20b and the grooves 21, respectively, provided for this purpose, which ensures an exact positioning of the sealing insert 15 in relation to the bottom part
10. Then the mounting collars 22 of the inlet part 13 and the outlet part 14 are inserted in the groove 21. Now, on these first three housing parts 10,13,14 of the housing 2, the top part 11 is mounted, in which the sliding element 6 and the spindle 7 have already been mounted. On both sides of the sliding element 6, the guiding counter-parts 25 are inserted in the guiding grooves 28 of the guiding device 24 of the sealing insert 15. Then, the top part 11 and the bottom part 10 are tightened to each other by means of bolts 26. Finally, the gate valve 1 can be mounted in a fluid circuit, for example a utility water system, by means of the flange parts 27 of the inlet part 13 and the outlet part 14, respectively.
For the control of a flow, the gate valve 1 can now be opened or closed. For this purpose, the sliding element 6 is displaced by means of the spindle 7. For the operation of the spindle 7, the gate valve 1 has on its top part 11a control connection 30. A handwheel, a motor or any other known and suited operating device can be connected to this control connection 30.
Fig. 4 shows a partial section through the sealing insert 15. It can be seen from the cut surfaces that the sealing insert 15 consists of two parts, namely a rigid body 31 (widely hatched) and an additional area 32 (tightly hatched). In the contact area 9, the additional area 32 also assumes sealing tasks in cooperation with the sliding element 6, and can therefore also be called sealing area. The sealing insert 15 is made of a plastic material, the plastic material having in the area of the rigid body 31a rigid material component and in the additional area 32 a soft material component. In a preferred manner, the rigid material component consists of polyoxy methylene (POM) and the soft material component of ethylene/propylene diene monomer (EPDM). Both material components of the rigid body 31 and the additional area 32 are connected with each other in the connecting areas 33 on the molecular level.
In the embodiment shown, the rigid body 31 extends over the complete sealing insert 15. Here, the complete guiding part 17 is exclusively formed by the rigid body 31. Pa rticularly in the area of the guiding device 24 this is very important, to ensure that the displacement of the sliding element 6 causes as little friction as possible. The clamping lips 18 and the clamping collar 19, on the other hand, are formed by the additional area 32. In this way, the use of the soft material component ensures a good deformability of these clamping areas 18,19. In the assembled state of the gate valve 1 a better sealing can thus be achieved between the individual parts 10,11, 13, 14 of the housing 2.
In a manner not shown in detail, the rigid body 31 is made of a plastic material, which is reinforced with glass fibres. Instead of glass fibres, other sorts of reinforcement fibres
can be used, for example carbon fibres. The additional area 31 is made in such a way that it covers at least 50% of the surface of the rigid body 31, which gets in touch with the water flowing through the gate valve 1. In the surfaces, which are covered by the additional area 31, a contact between the water and the glass fibre reinforced plastic material is avoided, which improves the opportunity of avoiding the risk that glass fibres are washed out of the plastic material of the rigid body 31.
As can be seen from the Figs. 7 and 8, the design of the clamping collar 19 has also been changed. The clamping collar 19 forms a "t ubular" extension of the flow area 5. In a part 60 of the extension, it expands in a cone shape, that is, the diameter increases in this part 60. In a second part 61 the extension has a substantially constant diameter.
The clamping collar 19, possibly having a somewhat smaller thickness than, but being made in one piece with the additional area 32, is inserted in a V-shaped groove 53 on the bottom part 10 and the top part 11, and is here retained by a circumferential, V-shap ed projection on the inlet part 13. A corresponding embodiment, not shown in detail, is available on the outlet part 14. The clamping of the clamping collar 19 between the top part 11 and the inlet part 13 and likewise between the bottom part 10 and the inlet part 13, prevents contact between the parts 11 and 13 and also between the parts 10 and 13. Thus, a damage of a possible coating (for example epoxy resin) of the parts 10,11,13, 14 is prevented. The same consideration also applies for the outlet part 14.
In the area of the groove bottom of the groove 53, the clamping collar 19 is thickened, that is, has a thickening 55, which forms some sort of an O-ring seal. It is not absolutely required that during mounting of the inlet part 13 on the housing 10,11 the thickening 55 is compressed at the deepest spot of the groove 53. However, the thickening 55 is shaped so that an extensive bearing of the clamping collar 19 is ensured on both the inlet part 13 and on the bottom part 10 or the top part 11, respectively, of the housing 2.
WE CLAIMS –
1. A gate valve having a housing comprising a bottom part (10) and a top part (11) separated by a flange connection (12); a first side part (13) comprising a housing inlet and a second side part (14) comprising a housing outlet; clamping connections between said first side part (13) and the bottom and top parts (10, 11) and between said second part (14) and the bottom and top parts (10,11), respectively; and a sealing insert (15) clamped between said bottom part (10), said top part (11) and the said first and second parts (13, 14); and a sliding member adapted for sliding movement in said housing between a first position in which it establishes a gate barrier between said inlet and said outlet and a second position in which said gate barrier is removed,
said sealing insert (15) having an opening (5) opposing said inlet and said outlet, and further having a contact area (9) adapted for sealing contact with said sliding member (6) during said member's sliding movement between said positions, said sealing contact establishing said barrier when said sliding member (6) is in said first position, said gate valve being characterized in that:
the sealing insert (15) comprises a rigid body (31) permanently connected to areas (32) having less rigidity than said rigid body (31), said areas (32) with less rigidity including said contact area (9) and clamped areas (18) in said flange connection (12) and areas (19) claniped between said first side part (13) and the bottom and top parts (10,11) and between said second side part (14) and the bottom and top parts (10,11).
2.	Gate valve according to claim 1, wherein the said permanent connection is on a molecular level.
3.	Gate valve according to claim 1 or 2, wherein said sealing insert (15) comprises a guiding part (17) for said sliding member (6) extending in said top part (11).
4.	Gate valve according to claim 1 or 2, wherein the sealing insert (15) is rna 5.	Gate valve according to claim 4, wherein the plastic material has a rigid and a soft material component, the rigid body (31) being formed substantially by the rigid material component and the additional area (32) being formed substantially by the soft material component.
6.	Gate valve according to claim 5, wherein the rigid material component is made of polyoxy m ethylene (POM).
7.	Gate valve according to claim 5, wherein the soft material component is made of ethylene/propylene diene monomer (EPDM).
8.	Gate valve according to one of the claims 1 to 7, wherein a filling material is arranged between the sealing insert (15) and the housing (2).
9.	Gate valve according to one of the claims 1 to 8, wherein the sealing insert (15) is provided with holes (51, 52).
10.	Gate valve according to claim 9, wherein the holes (51, 52) are arranged in the guiding part (17).	!
11.	Gate valve according to one of the claims 1 to 10, wherein the sealing insert (15) has at least one clamping area (18,19), which can be clamped between at least two housing parts (10, 11, 13, 14) of the housing (2).
12.	Gate valve according to claim 11, wherein the clamping area (18, 19) has a clamping lip (18), which can be clamped between a top part (11) and a bottom part (10) of the housing (2).
13.	Gate valve according to claim 11 or 12, wherein the clamping area (18,19) has a clamping ring (19), which can be clamped between the top part (11) or the bottom part (10) and an inlet part (13) or an outlet part (14) of the housing (2).
14.	Gate valve according to claim 13, wherein the clamping collar (19) is inserted in a V-shaped groove (53), in which a V-shaped mounting collar (22) engages radially in relation to the inlet or the outlet part (13,14).
15.	Gate valve according to claim 14, wherein in the area of the groove bottom of the groove (53) the clamping collar (19) has a thickening (55).
16.	Gate valve according to one of the claims 13 to 15, wherein the clamping collar (19) has notches (56) on its extreme end.
17.	Gate valve according to claim 16, wherein the notches (56) extend right down to the groove bottom.
18.	Gate valve according to one of the claims 1 to 17, wherein the sealing insert (15) has a guiding part (17), in which the sliding element (6) can be guided.
19.	Gate valve according to claim 18, wherein the guiding part (17) branches off from the remaining sealing insert (15) into a control area (8) in the top part (11) of the housing (2), in which the sliding element (6) is arranged in the open state.
20.	Gate valve according to claim 18 or 19, wherein the guiding part (17) has a guiding device (24), which cooperates with at least one guiding counter-part (25) of the sliding element (6).
21.	Gate valve according to claim 20, wherein the guiding device (24) is formed by the rigid body (31).
22.	Gate valve according to one of the claims 18 to 21, wherein the outside of the guiding part (17) has ribs (29), which are formed by the rigid body (31).
854-mumnp-2003-cancelled page(18-7-2005).pdf
854-mumnp-2003-claims(granted)-(18-7-2005).doc
854-mumnp-2003-claims(granted)-(18-7-2005).pdf
854-MUMNP-2003-CORRESPONDENCE 19-6-2008.pdf
854-mumnp-2003-correspondence(5-6-2008).pdf
854-mumnp-2003-correspondence(ipo)-(2-4-2007).pdf
854-mumnp-2003-drawing(10-9-2003).pdf
854-MUMNP-2003-FORM 13 19-6-2008.pdf
854-mumnp-2003-form 13(19-6-2008).pdf
854-mumnp-2003-form 19(10-9-2003).pdf
854-mumnp-2003-form 1a(10-9-2003).pdf
854-mumnp-2003-form 2(granted)-(18-7-2005).doc
854-mumnp-2003-form 2(granted)-(18-7-2005).pdf
854-mumnp-2003-form 26(1-7-2003).pdf
854-mumnp-2003-form 26(19-6-2008).pdf
854-mumnp-2003-form 3(17-10-2003).pdf
854-mumnp-2003-form 3(23-8-2003).pdf
854-mumnp-2003-form 5(23-8-2003).pdf
854-mumnp-2003-form-pct-ipea-409(10-9-2003).pdf
854-mumnp-2003-form-pct-isa-210(10-9-2003).pdf
854-MUMNP-2003-OTHER DOCUMENT 19-6-2008.pdf
854-mumnp-2003-other documents(18-7-2005).pdf
854-MUMNP-2003-POWER OF ATTORNEY 19-6-2008.pdf
854/MUMNP/2003
GAMLE GOMSRUDVEI 40, N-3612, KONGSBERG, NORWAY.
1 GRAVNINGEN, ROAR ANDREAS NYGAARDS VEI 5, N-3617, KONGSBERG, NORWAY.
2 HJALLEN, HELGE VESTLIVEIEN 4C, N-3615, KONGSBERG, NORWAY.
3 SYVERTSEN, JORN SENDING, N-3618 SKOLLENBORG, NORWAY.
4 NYGARD, ANDERS GAMLE KONGSBERG VEI, N - 3322, DARBU, NORWAY.
5 BIRKE-LAND, HEGE, LILL JOACOB LANGES VEI 47, N - 3610 KONGSBERG, NORWAY.
PCT/NO02/00117
1 101 14 566.7 2001-03-24 Germany