GB2542551A - Valve - Google Patents
Valve Download PDFInfo
- Publication number
- GB2542551A GB2542551A GB1514639.2A GB201514639A GB2542551A GB 2542551 A GB2542551 A GB 2542551A GB 201514639 A GB201514639 A GB 201514639A GB 2542551 A GB2542551 A GB 2542551A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- stem
- elongate
- curved
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2268—Sealing means for the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
- F16K5/0257—Packings
- F16K5/0285—Packings spindle sealing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0457—Packings
- F16K5/0485—Spindle sealing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0694—Spindle sealings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
A valve assembly comprises an elongate valve stem 16 and a valve body 11 adapted to receive the valve stem. The valve stem has first and second widthportions (20, 21 Fig. 3), the second width portion being larger than the first width portion, and a curved surface portion 61 extending between the first and second width portions. The valve body has an aperture for receiving the elongate valve stem and a curved surface 62 formed around the aperture for sealingly receiving the curved surface portion of the elongate valve stem in abutment therewith.
Description
Valve
This disclosure relates to valves, including valves suited to subsea use, but is not limited to such use.
Background to the Disclosure
Valves are operated by an actuator system which generally involves an actuator effecting rotation or reciprocation of an actuable member. The actuable member transmits the required motion to a valve closure element (ball, plate, disc, gate, plug, etc.) to control a fluid pathway to open, close or throttle flow of fluid through the valve depending upon the particular design of valve. The actuable member is typically referred to as the valve stem. Multiple valve types are in use, but in most types the principal problems to be addressed are to prevent leakage in the valve assembly and to prolong operability of bearing surfaces of the valve to maximise service life. Butterfly valves and ball valves are examples of valve types requiring a rotational motion to operate them. Where rotational motion is used, two sets of bearing are traditionally required to deal with axial and lateral forces: one set to manage the longitudinal thrust generated by the valve upon the valve stem, and another to maintain centralisation of the valve stem.
Description of the Drawings
Figure 1 illustrates a sectional view through a known ball valve assembly viewed from one side;
Figure 2 illustrates a sectional view through an embodiment of a ball valve assembly as disclosed herein;
Figure 3 illustrates an enlarged sectional view through part of the embodiment shown in Figure 2 showing detail of sealing surfaces;
Figure 4 illustrates a variant of the embodiment of Figures 2 and 3, with additional features as disclosed herein; and
Figure 5 illustrates a further variant of the embodiment of Figures 2 and 3, with additional features as disclosed herein.
Sub-Sea Ball Valve
In a subsea "ball” valve assembly of designed according to existing practice, as illustrated in Figure 1, a valve body 1 is mounted between flanged open bore adapters or connectors 2, 2' for fluid connection of the valve body 1 to a fluid conduit. A "ball” closure element 3 having a through bore 5 is located within a valve cavity 4 in the body 1 and trunnion-mounted in a bearing assembly 7, 7' for rotation within the body 1. A valve stem element 6 is mounted for rotation in a valve bonnet 8 and an end part 9 of the valve stem element 6 engages a recess 63 in the "ball" closure element. Such engagement of the end part 9 with the recess 63 of the ball closure element 3 allows a rotational motion [usually a quarter turn) applied to the valve stem element 6 by a suitable actuator to effect rotation of the ball closure element 3 within the body 1 and about the axis of the valve stem element 6. The rotation of the ball closure element 3 about the axis of the valve stem element 6 realigns the through bore 5 with respect to the open bores of the flanged connectors 2, 2'. Such movement of the through bore 5 relative to the open bores of the flanged connectors 2, 2' determines whether the valve is open to admit fluid flow or closed to fluid flow between the respective bores of the flanged connectors 2, 2'.
In such a valve, bearings to accommodate both longitudinal thrust upon the valve stem element 6 and lateral forces for centralising the valve stem element 6 during rotation are required. These thrust and rotational bearings are subject to wear and degradation in use, leading to shortening of effective valve service life. These bearings include additional sealing components to maintain a sufficient pressure seal around the valve stem element 6 for operational purposes.
Description of Embodiments
An embodiment of a valve suitable for use in a subsea environment, similar in principle and general construction to the valve of Figure 1, is shown in Figure 2, wherein like components share the same reference numerals, incremented by 10. Thus Fig. 2 shows a valve assembly wherein a valve body 11 is mounted between flanged open bore connectors 12, 12' for connection of the valve to a fluid conduit. A "ball" closure element 13 having a through bore 15 is located in a valve cavity 14 within the body 11 and trunnion-mounted in a bearing assembly 17, 17' for rotation within the body 1.
In this embodiment a new valve stem element 16 is provided. The stem valve element 16 has a structure which is configured to obviate the requirement for conventional stem thrust and rotational [centring) bearings, and serves both bearing and sealing functionalities in mating with a correspondingly modified valve body.
As shown in Fig. 2, a body portion 11 adjacent to the valve bonnet 18 is adapted to receive the valve stem element 16. The valve stem element 16 of this embodiment is formed to have a first width portion 20 capable of fitting through the valve bonnet 18, and a second width portion 21 which is wider and cannot pass through the valve bonnet 18.
An inner surface of the body portion 11 and a corresponding side surface of the wider width portion 21 of the stem valve element 16 are of sufficiently complementary curved shape to form bearing surfaces which are sealingly engageable to maintain a pressure seal around the stem valve element 16 in normal use of the valve. These bearing surfaces are respectively identified as a stem bearing surface 61, and a body bearing surface 62 in Fig. 2. The curvature of the respective bearing surfaces 61, 62 is such as to provide a self-centring action when the curved stem bearing surface 61 of the stem valve element 16 is presented to the curved body bearing surface 62 of the body portion 11 in assembly of the valve. The curved bearing surface 62 of the body portion 11 may be configured as a generally concave dish shape or cup receptacle to sealingly receive the curved stem bearing surface 61 of the stem valve element 16. The curved stem bearing surface 61 of the stem valve element 16 may be part spherical or part ellipsoidal as shown in Fig.2.
An end 19 of the stem valve element 16 is secured in a recess 73 in the "ball" closure element 13 to ensure that rotary motion applied through the stem valve element 16 turns the "ball" closure element in a controlled manner.
The curved stem bearing surface 61 of the stem valve element 16 may be urged into contact with the curved body bearing surface 62 of the body portion 11 by biasing means 29 located at the end 19 of the stem valve element 16. The biasing means 29 may be a mechanical component such as a cupped spring washer, disc spring or other resilient member capable of applying a thrust against the end 19 of the stem valve element 16. A Belleville spring washer is suitable for this purpose and shown in section in Fig. 2. Use of such biasing means 29 urges the stem valve element 16 and its curved stem bearing surface 61 against the curved body bearing surface 62 of the body portion 11 to form a sealing abutment even when there is no fluid pressure in the valve.
In a variant as illustrated in Fig. 4, a collar 46 is locatable upon a first, narrow width portion 420 of the stem valve element 416 and assembled therewith to hold a resilient biasing member 49 against a surface of a body portion 411. The stem valve element 416 is thereby urged upwardly relative to the surface of the body portion 411 in a typical orientation of the valve in use. The collar may be assembled from multiple parts, for example at least two parts and fixed to the stem valve element 416. The resilient biasing member 49 may be a compression spring such as a coil spring or disc spring.
In the embodiment of Fig. 4, the stem valve element 416 has a second, wider width portion 421 retained within the body portion 411. Respective cooperating bearing surfaces 461, 462 of the stem valve element 416 and the body portion 411 are ellipsoidal surfaces.
The wider width portion 421 is located towards an end 419 of the stem valve element 416 which seats in a recess 473 within a ball closure element 413 against a resilient biasing member 429 which may be a spring washer.
In any embodiment, the curved stem bearing surface of the stem valve element and the curved body bearing surface of the body portion respectively may be metal surfaces to form a metal to metal pressure seal.
Furthermore, in any embodiment, the curved stem bearing surface [61 in Fig. 2) of the stem valve element (16 in Fig. 2] and the curved body bearing surface (62 in Fig. 2) of the body portion (11 in Fig. 2) respectively may be subjected to finishing treatments and materials to reduce friction and wear, for example polishing and/or applying thin low-friction films or coatings to inhibit wear.
In a further embodiment illustrated in Fig. 5, a valve stem element 516 is formed to have a first width portion 520, which extends through a valve body 511 and a second width portion 521 which is wider and retained within the valve body 511. An edge of a curved stem bearing surface 561 of the stem valve element 516 may be formed as a flexible lip, for example configured as a thin peripheral dependent skirt 31 as illustrated in Fig. 5 to accommodate differential thermal expansion. The flexibility which may be required to accommodate thermal expansion and pressure changes may be realised by forming an annular channel 33 in a surface of the second width portion 521 which is located towards an end portion 519 of the stem valve element 516.
In embodiments of the disclosed valve the valve body forms a concave spherical part such as a part-spherical or hemispherical cup for receiving the convex curved side portion of the stem valve element which may be correspondingly spherical (ball-shaped) to mate with the concave part or hemispherical cup. The part spherical cup may extend over a substantial surface of the spherical (ball-shaped) curved side portion of the stem valve element.
In further embodiments, additional bearing surfaces equivalent to those formed by the curved side portion 21 of the stem valve element 16 and the curved inner surface of the body portion 11 may be provided at a diametrically opposed position with respect to the "ball" closure element 3 in additional components equivalent to the said curved side portion 21 of the stem valve element 16 and the curved inner surface of the body portion 11 and located in the opposite side of the valve assembly.
In summary the present disclosure provides a valve assembly comprising an elongate valve stem (16) and a valve body (11) adapted to receive the valve stem, wherein the valve stem has first and second width portions (20, 21), the second width portion being larger than the first width portion, and a curved surface portion (61) extending between the first and second width portions, wherein the valve body has an aperture for receiving the elongate valve stem and a curved surface (62) formed around the aperture for sealingly receiving the curved surface portion of the elongate valve stem in abutment therewith.
The disclosure also provides a valve assembly comprising a valve body (11) having at least an inlet and an outlet bore in respective connectors (12, 12’), a valve cavity (14) defined within the valve body between the inlet and outlet bores for receiving a valve closure element, a valve closure element (13) positioned in the valve cavity to control fluid flow between the inlet and outlet bores, an aperture in the valve body for receiving a valve stem element, an elongate valve stem element (16) extending from the valve cavity through the aperture in the valve body to external actuator means, and being engaged at one end (19) in the valve closure element (13), wherein the valve stem has first and second width portions (20, 21), the second width portion (21) being larger than the first width portion (20), and a curved stem bearing surface (61) extending between the first and second width portions, wherein the valve body (11) has an aperture for receiving the elongate valve stem (16) and a curved body bearing surface (62) formed around the aperture for sealingly receiving the curved stem bearing surface (61) of the elongate valve stem (16) in abutment therewith.
Claims 1. A valve assembly comprising an elongate valve stem (16) and a valve body (11) adapted to receive the valve stem, wherein the valve stem has first and second width portions (20, 21), the second width portion being larger than the first width portion, and a curved surface portion (61) extending between the first and second width portions, wherein the valve body has an aperture for receiving the elongate valve stem and a curved surface (62) formed around the aperture for sealingly receiving the curved surface portion of the elongate valve stem in abutment therewith. 2. A valve assembly as claimed in claim 1, wherein the curved surface portion (61) of the elongate valve stem is semi-ellipsoidal in configuration. 3. A valve assembly as claimed in claim 1, wherein the curved surface portion (61) of the elongate valve stem is semi-spherical in configuration. 4. A valve assembly as claimed in any one of the preceding claims, and comprising biasing means (29, 49) for urging the curved surface portion (61) of the elongate valve stem (16) into sealing contact with the curved surface (62) formed around the aperture of the valve body (11). 5. A valve assembly as claimed in claim 4, wherein the biasing means (29) is positioned at an end (19) of the elongate valve stem (16) located within the valve body (11). 6. A valve assembly as claimed in claim 4, wherein the biasing means (49) is positioned on the first width portion (20) of the elongate valve stem (16) and held against the body (11) by a collar (46) located on the first width portion of the elongate valve stem. 7. A valve assembly as claimed in claim 4, wherein the biasing means (29, 49) comprises at least one of a spring washer, disc spring or other resilient member. 8. A valve assembly comprising a valve body (11) having at least an inlet and an outlet bore in respective connectors (12,12’), a valve cavity (14) defined within the valve body between the inlet and outlet bores for receiving a valve closure element, a valve closure element (13) positioned in the valve cavity to control fluid flow between the inlet and outlet bores, an aperture in the valve body for receiving a valve stem element, an elongate valve stem element (16) extending from the valve cavity through the aperture in the valve body to external actuator means, and being engaged at one end (19) in the valve closure element (13), wherein the valve stem has first and second width portions (20, 21), the second width portion (21) being larger than the first width portion (20), and a curved stem bearing surface (61) extending between the first and second width portions, wherein the valve body (11) has an aperture for receiving the elongate valve stem (16) and a curved body bearing surface (62) formed around the aperture for sealingly receiving the curved stem bearing surface (61) of the elongate valve stem (16) in abutment therewith. 9. A valve assembly as claimed in claim 9, and comprising biasing means (29, 49) for urging the curved surface portion (61) of the elongate valve stem (16) into sealing contact with the curved surface (62) formed around the aperture of the valve body (11). 10. A valve assembly as claimed in claim 8, or claim 9, wherein the biasing means (29, 49) comprises at least one of a spring washer, disc spring or other resilient member. 11. A valve assembly as claimed in any one of the preceding claims, wherein the curved stem bearing surface (61) of the stem valve element (16) and the curved body bearing surface (62) of the body portion (11) respectively are subjected to finishing treatments and materials to reduce friction and wear, for example polishing and/or applying thin low-friction films or coatings to inhibit wear. 12. A valve assembly as claimed in any one of the preceding claims, wherein an edge of the curved stem bearing surface (61) of the stem valve element (16) is formed as a flexible lip or skirt (31). 13. A valve assembly as claimed in any one of the preceding claims, comprising a longitudinal valve. 14. A valve assembly substantially as described with reference to, and substantially as shown in any one of Figs 2 to 5.
Claims (14)
1. A valve assembly comprising an elongate valve stem (16) and a valve body (11) adapted to receive the valve stem, wherein the valve stem has first and second width portions (20, 21), the second width portion being larger than the first width portion, and a curved surface portion (61) extending between the first and second width portions, wherein the valve body has an aperture for receiving the elongate valve stem and a curved surface (62) formed around the aperture for sealingly receiving the curved surface portion of the elongate valve stem in abutment therewith.
2. A valve assembly as claimed in claim 1, wherein the curved surface portion (61) of the elongate valve stem is semi-ellipsoidal in configuration.
3. A valve assembly as claimed in claim 1, wherein the curved surface portion (61) of the elongate valve stem is semi-spherical in configuration.
4. A valve assembly as claimed in any one of the preceding claims, and comprising biasing means (29, 49) for urging the curved surface portion (61) of the elongate valve stem (16) into sealing contact with the curved surface (62) formed around the aperture of the valve body (11).
5. A valve assembly as claimed in claim 4, wherein the biasing means (29) is positioned at an end (19) of the elongate valve stem (16) located within the valve body (11).
6. A valve assembly as claimed in claim 4, wherein the biasing means (49) is positioned on the first width portion (20) of the elongate valve stem (16) and held against the body (11) by a collar (46) located on the first width portion of the elongate valve stem.
7. A valve assembly as claimed in claim 4, wherein the biasing means (29, 49) comprises at least one of a spring washer, disc spring or other resilient member.
8. A valve assembly comprising a valve body (11) having at least an inlet and an outlet bore in respective connectors (12,12’), a valve cavity (14) defined within the valve body between the inlet and outlet bores for receiving a valve closure element, a valve closure element (13) positioned in the valve cavity to control fluid flow between the inlet and outlet bores, an aperture in the valve body for receiving a valve stem element, an elongate valve stem element (16) extending from the valve cavity through the aperture in the valve body to external actuator means, and being engaged at one end (19) in the valve closure element (13), wherein the valve stem has first and second width portions (20, 21), the second width portion (21) being larger than the first width portion (20), and a curved stem bearing surface (61) extending between the first and second width portions, wherein the valve body (11) has an aperture for receiving the elongate valve stem (16) and a curved body bearing surface (62) formed around the aperture for sealingly receiving the curved stem bearing surface (61) of the elongate valve stem (16) in abutment therewith.
9. A valve assembly as claimed in claim 9, and comprising biasing means (29, 49) for urging the curved surface portion (61) of the elongate valve stem (16) into sealing contact with the curved surface (62) formed around the aperture of the valve body (11).
10. A valve assembly as claimed in claim 8, or claim 9, wherein the biasing means (29, 49) comprises at least one of a spring washer, disc spring or other resilient member.
11. A valve assembly as claimed in any one of the preceding claims, wherein the curved stem bearing surface (61) of the stem valve element (16) and the curved body bearing surface (62) of the body portion (11) respectively are subjected to finishing treatments and materials to reduce friction and wear, for example polishing and/or applying thin low-friction films or coatings to inhibit wear.
12. A valve assembly as claimed in any one of the preceding claims, wherein an edge of the curved stem bearing surface (61) of the stem valve element (16) is formed as a flexible lip or skirt (31).
13. A valve assembly as claimed in any one of the preceding claims, comprising a longitudinal valve.
14. A valve assembly substantially as described with reference to, and substantially as shown in any one of Figs 2 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1514639.2A GB2542551A (en) | 2015-08-18 | 2015-08-18 | Valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1514639.2A GB2542551A (en) | 2015-08-18 | 2015-08-18 | Valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201514639D0 GB201514639D0 (en) | 2015-09-30 |
| GB2542551A true GB2542551A (en) | 2017-03-29 |
Family
ID=54258768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1514639.2A Withdrawn GB2542551A (en) | 2015-08-18 | 2015-08-18 | Valve |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2542551A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489781A (en) * | 2017-09-18 | 2017-12-19 | 江苏诚功阀门科技有限公司 | The assembly technology of fixing ball valve |
| EP3594539A1 (en) * | 2018-07-09 | 2020-01-15 | Hamilton Sundstrand Corporation | Shouldered shaft with spherical thrust seat |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3458172A (en) * | 1966-05-26 | 1969-07-29 | Dresser Ind | Ball valve |
| US6129336A (en) * | 1998-01-16 | 2000-10-10 | Xomox | Ball stem seal |
| US20110297863A1 (en) * | 2008-10-28 | 2011-12-08 | Zhejiang China Valve Co., Ltd. | Stem shoulder seal with double rings and an assembly of independent dual stem seals |
-
2015
- 2015-08-18 GB GB1514639.2A patent/GB2542551A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3458172A (en) * | 1966-05-26 | 1969-07-29 | Dresser Ind | Ball valve |
| US6129336A (en) * | 1998-01-16 | 2000-10-10 | Xomox | Ball stem seal |
| US20110297863A1 (en) * | 2008-10-28 | 2011-12-08 | Zhejiang China Valve Co., Ltd. | Stem shoulder seal with double rings and an assembly of independent dual stem seals |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489781A (en) * | 2017-09-18 | 2017-12-19 | 江苏诚功阀门科技有限公司 | The assembly technology of fixing ball valve |
| EP3594539A1 (en) * | 2018-07-09 | 2020-01-15 | Hamilton Sundstrand Corporation | Shouldered shaft with spherical thrust seat |
| US10844963B2 (en) | 2018-07-09 | 2020-11-24 | Hamilton Sunstrand Corporation | Shouldered shaft with spherical thrust seat |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201514639D0 (en) | 2015-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |