GB2032582A - Improvements relating to apparatus for handling bulk or fluent materials - Google Patents
Improvements relating to apparatus for handling bulk or fluent materials Download PDFInfo
- Publication number
- GB2032582A GB2032582A GB7842359A GB7842359A GB2032582A GB 2032582 A GB2032582 A GB 2032582A GB 7842359 A GB7842359 A GB 7842359A GB 7842359 A GB7842359 A GB 7842359A GB 2032582 A GB2032582 A GB 2032582A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- isolating
- valve according
- downstream
- isolating valve
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- 239000013590 bulk material Substances 0.000 claims abstract description 8
- 238000010926 purge Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000011214 refractory ceramic Substances 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/029—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with two or more gates
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
- F16K3/06—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
Fluidised material can be handled generally in the same manner as normal fluids but particular problems arise in the operation of isolating or shut-off valves due to the granular nature of bulk material. The isolating valve described is of a double shutter type in which the upstream valve 8 is first closed to substantially cut-off the material flow and the downstream valve 9 subsequently closed to provide a gas-tight seal. <IMAGE>
Description
SPECIFICATION
Improvements relating to apparatus for handling bulk or fluent materials
This invention relates to apparatus for handling bulk or fluent materials
Particulate and granulate bulk materials are conveniently handled by fluidising the material, that is by forcing air or other suitabie gas through a mass of the material to cause it to assume fluid
like properties. The fluidised material can then be conveyed to its destination through a pipe and its flow therein controlled by special valves. A
problem which arises in such valves is combining the functions of shutting off the material flow and
providing a gas-tight seal. The present invention seeks to provide an isolating valve which overcomes these problems by separating the functions of shutting-off the material flow and
providing the gas-tight seal.
According to the present invention, an isolating valve for controlling or shutting-off the flow of
bulk material in a pipe-line comprises a valve body
having inlet and outlet ports and an intermediate
region or chamber lying therebetween, a first or
upstream valve means operable to interrupt the flow of material through the inlet port into the
intermediate chamber, and a second or
downstream valve means operable to provide a
gas-tight seal between the intermediate chamber
and the outlet port.
Preferably the operating mechanisms of the
valves are not linked so that the valves may be
operated independently, normally the upstream
valve is closed to shut-off material flow before the
downstream valve is closed to provide the gas
tight seal.
Further features of the invention will be
apparent from the following description of the
preferred embodiment in which reference will be
made to the accompanying drawing, which shows
a longitudinal section through a double shutter
isolating valve.
The double shutter isolating valve shown in the
drawing comprises a generally cylindrical hollow
valve body having at one end an inlet port 1 and at
the opposite end an outlet port 2. The inlet and
outlet ports communicate with an intermediate
chamber 3 within the valve through a first or
upstream shutter valve 4 and a second or
downstream shutter valve 5 respectively. The
shutter valves 4 and 5 are independently operable by means qf operating mechanisms 6 and 7
respectively. The valve shutters 8 and Sare both
disposed within the intermediate chamber 3 and
may be moved into position against valve seats 10
and 11 respectively to seal off the intermediate
chamber 3 from the inlet or outlet port as
appropriate.
In operation, with the valves 4 and 5 open,
fluidised bulk material enters the valve through
inlet port 1 in the direction of arrow 12, passes
through the intermediate chamber 3, through the
open valve 5 and the outlet port 2. To interrupt the
flow of material and isolate the inlet port 1 from the outlet port 2, the valve 4 is first closed so the valve shutter 8 moves into position against the valve seat 10 and halts the flow of bulk material without necessarily providing a gas-tight seal, subsequently the valve 5 is closed and the shutter 9 is moved into position against the valve seat 11 to provide a gas-tight seal.Thus, in operation, the function of shutting-off material flow is separated in space and time from the function of providing a gas-tight seal so that interference between the two functions is reduced as, for example, might occur if only one valve is used and the valve seat is contaminated by bulk material debris. Since the upstream valve 4 substantially halts the flow of bulk material when closed, the downstream valve 5 which provides the gas-tight seal, operates in a relatively clean environment and may be further assisted in providing a gas-tight seal by purging of the valve seat 11 with air or other suitable gas blown in through a purge vent or vents, one of which is shown at reference 13.The valve shutters 8 and 9 are both housed entirely within the intermediate chamber 3 in both their open and closed positions so that no change in internal volume of the chamber 3 is involved when one or both of the valves is operated.
In the particular example being described, the valve body is cast in two complementary halves 14 and 1 5 which are bolted together by means of centre flanges 16, 17, respectively, to form a composite valve body, further end f!anges 18, 19 are provided for connection of the valve into a conveyor pipe line. The particular valve is intelded for operation in a high temperature environment and each half 14, 1 5 of the valve body is provided with a refractory ceramic liner 21, respectively.
The valve seats 10, 11 are also formed of special hard material to obviate wear. Silicon carbide seats are made by slip-casting an initial valve seat member which after a preliminary firing may be machined to its final size. The material is such that, after final firing, it assumes its hard properties without any further change in dimensions. The valve seat can then be pressed into the valve body.It will also be seen from the drawing that the seating faces of both valves are towards the intermediate chamber so that material flowing through the valve may impinge on the seating face of the downstream valve 5, thus the internal diameter of the downstream valve 5 is preferably larger than that of the upstream valve 4 so that the main flow through the valve passes through the centre portion of the downstream valve without impinging on the valve seat face and avoiding excessive wear of the seat face.
Although it has been previously mentioned in connection with the operating mechanisms 6 and 7 for the valves that there is no mechanical linkage between them, it is clearly preferable that at least some form of interlock is incorporated in the control mechanism so that the downstream valve 5 is not closed or an attempt made to close
it until the upstream valve 4 has substantially
shut-off the flow of bulk material. Such an interlock may be built into the control or actuating means for the valve operating mechanisms 6 and 7.
Claims (13)
1. An isolating valve for controlling or shuttingoff the flow of bulk material in a pipe-line comprises a valve body having inlet and outlet ports and an intermediate chamber lying therebetween, first or upstream valve means operable to interrupt the flow of material through the inlet port into the intermediate chamber and second or downstream valve means operable to provide a gas-tight seal between the intermediate chamber and the outlet port.
2. An isolating valve according to Claim 1, wherein one or more purge vents are formed in the valve body for directing a gas jet towards the seat of the second or downstream valve means.
3. An isolating valve according to either Claim 1 or Claim 2, wherein the first and second valve means are independently operable.
4. An isolating valve according to any preceding claim including valve operating means operative to close the first or upstream valve means in advance of the second or downstream valve means.
5. An isolating valve according to any preceding claim, wherein the inlet and outlet ports, and the upstream and downstream valve seats are axially aligned.
6. An isolating valve according to any preceding claim wherein the valve means comprise shutter valves.
7. An isolating valve according to Claim 6, wherein the valve shutters are disposed within the intermediate chamber.
8. An isolating valve according to any of Claims 5, 6 or 7, wherein the valve seat diameter of the downstream valve means is greater than the valve seat diameter of the upstream valve means.
9. An isolating valve according to any preceding claim, wherein the valve seats are formed of hard material.
10. An isolating valve according to Claim 9, wherein the hard material is silicon carbide.
11. An isolating valve according to any preceding claim, wherein the interior of the valve body is lined with refractory ceramic material extending at least between the valve ports and each respective valve seat.
12. An isolating valve according to any preceding claim, wherein the valve body comprises separately formed parts of complementary configuration, each of which includes a valve means and associated port.
13. An isolating valve substantially as described herein with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7842359A GB2032582B (en) | 1978-10-28 | 1978-10-28 | Apparatus for handling bulk or fluent materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7842359A GB2032582B (en) | 1978-10-28 | 1978-10-28 | Apparatus for handling bulk or fluent materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2032582A true GB2032582A (en) | 1980-05-08 |
| GB2032582B GB2032582B (en) | 1983-01-12 |
Family
ID=10500670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7842359A Expired GB2032582B (en) | 1978-10-28 | 1978-10-28 | Apparatus for handling bulk or fluent materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2032582B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2497911A1 (en) * | 1981-01-14 | 1982-07-16 | Westinghouse Electric Corp | TAP FOR ABRASIVE MATERIALS |
| WO2002001035A3 (en) * | 2000-06-28 | 2002-03-14 | Mks Instr Inc | Dual pendulum valve assembly |
| CN105042155A (en) * | 2015-08-12 | 2015-11-11 | 无锡乐华自动化科技有限公司 | Speed regulation method for gate type flow speed control valve |
-
1978
- 1978-10-28 GB GB7842359A patent/GB2032582B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2497911A1 (en) * | 1981-01-14 | 1982-07-16 | Westinghouse Electric Corp | TAP FOR ABRASIVE MATERIALS |
| WO2002001035A3 (en) * | 2000-06-28 | 2002-03-14 | Mks Instr Inc | Dual pendulum valve assembly |
| GB2380242A (en) * | 2000-06-28 | 2003-04-02 | Mks Instr Inc | Dual pendulum valve assembly |
| GB2380242B (en) * | 2000-06-28 | 2004-06-16 | Mks Instr Inc | Dual pendulum valve assembly |
| DE10196376B4 (en) * | 2000-06-28 | 2008-08-07 | Mks Instruments Inc., Andover | Dual pendulum valve assembly has annular cover movable within interior space between two positions where cover protects valve seat of opening or is spaced from valve seat so valve body can engage valve seat and seal opening |
| DE10165035B3 (en) * | 2000-06-28 | 2013-10-17 | Mks Instruments, Inc. | Method and system for precise control of the vacuum pressure inside a process chamber |
| CN105042155A (en) * | 2015-08-12 | 2015-11-11 | 无锡乐华自动化科技有限公司 | Speed regulation method for gate type flow speed control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2032582B (en) | 1983-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |