GB2140533A - Precision valve - Google Patents

Precision valve Download PDF

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Publication number
GB2140533A
GB2140533A GB08305680A GB8305680A GB2140533A GB 2140533 A GB2140533 A GB 2140533A GB 08305680 A GB08305680 A GB 08305680A GB 8305680 A GB8305680 A GB 8305680A GB 2140533 A GB2140533 A GB 2140533A
Authority
GB
United Kingdom
Prior art keywords
stem
valve
screw
control
sleeve
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Withdrawn
Application number
GB08305680A
Other versions
GB8305680D0 (en
Inventor
Douglas Diepa Williams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08305680A priority Critical patent/GB2140533A/en
Publication of GB8305680D0 publication Critical patent/GB8305680D0/en
Publication of GB2140533A publication Critical patent/GB2140533A/en
Withdrawn legal-status Critical Current

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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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • F16K31/506—Mechanical actuating means with screw-spindle or internally threaded actuating means with plural sets of thread, e.g. with different pitch

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Lift Valve (AREA)

Abstract

A valve of the kind in which the valve stem travels up and down a valve body under the action of a rotary control which is screw-threaded to the body and linked to the stem, and in which the stem is positively guided in the body, is characterised in that the rotary control (19) as well as being screw-threaded to the body (11) is also screw-threaded to the stem (18) so that a given rotary movement of the control up or down the body can cause the stem to travel farther or less far than the control travels during that movement, depending on the selection of pitch of the two screw threads. <IMAGE>

Description

SPECIFICATION Precision valve The invention relates to a valve of the kind in which a valve stem travels up and down a valve body under the action of a rotary control which is screwthreaded to the body and linked to the stem.
Such a valve will be referred to in this specification as a valve "of the kind in question".
Conventionally, the rotary control is directly linked to the valve stem and carries the stem up and down the body in direct proportion to the movement of the control itself up and down the body. The stem may rotate with the control, as in a simple domestic water tap valve.
Alternatively, the valve stem may be positively guided in or on the body to prevent it from rotating as it travels up and down the body under the action of the rotary control.
Thus in conventional valves of the kind in question, the fineness of adjustment of the valve is dependent wholly on the pitch of the screw-threaded connection between the valve body and the rotary control. At the time of writing, the usual finest-pitch thread used is a micrometer-type thread having forty turns per inch and giving movement of the valve stem of 0.025 inches for each complete rotation of the rotary control.
Finer pitch threads are available, but the fines the thread the weaker, mechanically, is the mating between the threads.
According to the invention, a valve of the kind in question, and in which the stem is positively guided in the body, is characterised in that the rotary control, as well as being screw-threaded to the body, is also screw-threaded to the stem, so that a given rotary movement of the control up or down the body can cause the stem to travel farther or less far than the control travels during that movement, depending on the selection of pitch of the two screw threads.
By suitable selection of th read pitch, a screwthreaded connection having adequate mechanical strength can be achieved whilst at the same time greatly increasing (or greatly decreasing if desired) the effective number of turns per inch of the rotary control.
For example, tests have shown than an effective TPI number well in excess of 150 can be achieved it is is desired to have fine-pitch control over the stem movement.
It is especially advantageous if a sleeve is provided between the stem and the body, in which sleeve the stem can slide as it travels up and down the body.
The fit between the sleeve and the stem can be precision-finished, and the necessary positive guiding means can act between the stem and the sleeve instead of having to act direct between the stem and the body. Because the sleeve can be machined in its own right, and under specially controlled conditions, this makes the whole assembled valve less likely to be damaged during manufacture.
One valve embodying the invention is shown in the accompanying drawing. It is only an example of forms which the invention might take within its broad aspect. It is the best way currently known to the applicant of putting the invention into practice.
The drawing shows the valve in longitudinal section. It is intended for controlling gas/air flows in a small brazing or welding torch.
A valve body 11 is shouldered at its lower end and is is screw-threaded into a base 12 through which an inlet bore 13 and an outlet bore 14forthe gas/air mixture both pass by way of a valve chamber 15.
A seat 16 is machined into the valve chamber to take the machined conical end 17 of a valve stem 18 which travels up and down inside the body 11 under the action of a rotary control cap 19 which is screw-threaded, as indicated at 21, on to the outside of the body 11.
The rotary cap 19 is linked to the valve stem 18 by another screw-threaded engagement 22. The stem 18 can slide in a sleeve 23 which is itself soldered, pinned, keyed or welded into the body 11 and so does not move at all relative to the body.
The stem 18 is positively guided in the sleeve 23 by virtue of a pin 24 each end of which slides up and down a respective slot 25, 26 in the sleeve 23. The two slots 25, 26 are diametrically opposite one another in the sleeve 23, and run parallel with the sleeve axis. They extend up the sleeve, from its bottom end, for a distance somewhat greater than the maximum intended travel of the valve stem 18.
As the control cap 19 is rotated on the valve body 11, it will travel up and down the body. It will carry the stem 18 with it. At the same time, however, it will also rotate relative to the stem 18, by virtue of the screw-threaded engagement indicated at 22, and because the pin-and-slot connection 24,25, 26 allows the stem to travel up and down but prevents it from rotating relative to the body 11.
So, if the screw threads are appropriately chosen, an extra fine or extra coarse valve control can result.
A nut 27 is threaded and locked on to the screw-threaded upper end of the stem 18, to prevent the cap 19 from coming right off the top of the stem.
The disc 28 is similarly fastened into the top of the cap 19 to seal the screw threads against dirt or moisture from above.
The valve illustrated is particularly suited for motorised servo valves where the motors inevitably tend to "hunt", i.e. cannot be guaranteed to stop in exactly the same rotational attitude every time they are switched off. The extra fine control attainable with such a valve means that any leakage due to this "hunting" will be minimised if not cut out altogether.
CLAIMS (Filed on 16 March 1983) 1. A valve of the kind in question, and in which the stem is positively guided in the body, characterised in that the rotary control, as well as being screw-threaded to the body, is also screw-threaded to the stem, so that a given roatary movement of the control up or down the body can cause the stem to travel farther or less far than the control travels during that movement, depending on the selection of pitch of the two screw threads.
2. A valve according to Claim 1 and characterised
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Precision valve The invention relates to a valve of the kind in which a valve stem travels up and down a valve body under the action of a rotary control which is screwthreaded to the body and linked to the stem. Such a valve will be referred to in this specification as a valve "of the kind in question". Conventionally, the rotary control is directly linked to the valve stem and carries the stem up and down the body in direct proportion to the movement of the control itself up and down the body. The stem may rotate with the control, as in a simple domestic water tap valve. Alternatively, the valve stem may be positively guided in or on the body to prevent it from rotating as it travels up and down the body under the action of the rotary control. Thus in conventional valves of the kind in question, the fineness of adjustment of the valve is dependent wholly on the pitch of the screw-threaded connection between the valve body and the rotary control. At the time of writing, the usual finest-pitch thread used is a micrometer-type thread having forty turns per inch and giving movement of the valve stem of 0.025 inches for each complete rotation of the rotary control. Finer pitch threads are available, but the fines the thread the weaker, mechanically, is the mating between the threads. According to the invention, a valve of the kind in question, and in which the stem is positively guided in the body, is characterised in that the rotary control, as well as being screw-threaded to the body, is also screw-threaded to the stem, so that a given rotary movement of the control up or down the body can cause the stem to travel farther or less far than the control travels during that movement, depending on the selection of pitch of the two screw threads. By suitable selection of th read pitch, a screwthreaded connection having adequate mechanical strength can be achieved whilst at the same time greatly increasing (or greatly decreasing if desired) the effective number of turns per inch of the rotary control. For example, tests have shown than an effective TPI number well in excess of 150 can be achieved it is is desired to have fine-pitch control over the stem movement. It is especially advantageous if a sleeve is provided between the stem and the body, in which sleeve the stem can slide as it travels up and down the body. The fit between the sleeve and the stem can be precision-finished, and the necessary positive guiding means can act between the stem and the sleeve instead of having to act direct between the stem and the body. Because the sleeve can be machined in its own right, and under specially controlled conditions, this makes the whole assembled valve less likely to be damaged during manufacture. One valve embodying the invention is shown in the accompanying drawing. It is only an example of forms which the invention might take within its broad aspect. It is the best way currently known to the applicant of putting the invention into practice. The drawing shows the valve in longitudinal section. It is intended for controlling gas/air flows in a small brazing or welding torch. A valve body 11 is shouldered at its lower end and is is screw-threaded into a base 12 through which an inlet bore 13 and an outlet bore 14forthe gas/air mixture both pass by way of a valve chamber 15. A seat 16 is machined into the valve chamber to take the machined conical end 17 of a valve stem 18 which travels up and down inside the body 11 under the action of a rotary control cap 19 which is screw-threaded, as indicated at 21, on to the outside of the body 11. The rotary cap 19 is linked to the valve stem 18 by another screw-threaded engagement 22. The stem 18 can slide in a sleeve 23 which is itself soldered, pinned, keyed or welded into the body 11 and so does not move at all relative to the body. The stem 18 is positively guided in the sleeve 23 by virtue of a pin 24 each end of which slides up and down a respective slot 25, 26 in the sleeve 23. The two slots 25, 26 are diametrically opposite one another in the sleeve 23, and run parallel with the sleeve axis. They extend up the sleeve, from its bottom end, for a distance somewhat greater than the maximum intended travel of the valve stem 18. As the control cap 19 is rotated on the valve body 11, it will travel up and down the body. It will carry the stem 18 with it. At the same time, however, it will also rotate relative to the stem 18, by virtue of the screw-threaded engagement indicated at 22, and because the pin-and-slot connection 24,25, 26 allows the stem to travel up and down but prevents it from rotating relative to the body 11. So, if the screw threads are appropriately chosen, an extra fine or extra coarse valve control can result. A nut 27 is threaded and locked on to the screw-threaded upper end of the stem 18, to prevent the cap 19 from coming right off the top of the stem. The disc 28 is similarly fastened into the top of the cap 19 to seal the screw threads against dirt or moisture from above. The valve illustrated is particularly suited for motorised servo valves where the motors inevitably tend to "hunt", i.e. cannot be guaranteed to stop in exactly the same rotational attitude every time they are switched off. The extra fine control attainable with such a valve means that any leakage due to this "hunting" will be minimised if not cut out altogether. CLAIMS (Filed on 16 March 1983)
1. A valve of the kind in question, and in which the stem is positively guided in the body, characterised in that the rotary control, as well as being screw-threaded to the body, is also screw-threaded to the stem, so that a given roatary movement of the control up or down the body can cause the stem to travel farther or less far than the control travels during that movement, depending on the selection of pitch of the two screw threads.
2. A valve according to Claim 1 and characterised in that the valve travels up and down inside a sleeve which is itself non-rotatably secured to the body.
3. A valve according to Claim 2 and in which the stem is positively guided by a pin-and-slot connection between the stem and the sleeve.
4. A valve substantially as described herein with reference to and as illustrated in the accompanying drawing.
GB08305680A 1983-03-01 1983-03-01 Precision valve Withdrawn GB2140533A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08305680A GB2140533A (en) 1983-03-01 1983-03-01 Precision valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08305680A GB2140533A (en) 1983-03-01 1983-03-01 Precision valve

Publications (2)

Publication Number Publication Date
GB8305680D0 GB8305680D0 (en) 1983-03-30
GB2140533A true GB2140533A (en) 1984-11-28

Family

ID=10538828

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08305680A Withdrawn GB2140533A (en) 1983-03-01 1983-03-01 Precision valve

Country Status (1)

Country Link
GB (1) GB2140533A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180040A (en) * 1985-09-02 1987-03-18 Frederick Goodall Operating mechanism for domestic taps
GB2194619A (en) * 1986-08-29 1988-03-09 Shen Chung Shan Automatic water faucet
WO1989003492A1 (en) * 1987-10-08 1989-04-20 Gce Gas Control Equipment Ab Improvements to valves in gas bottles
AT394041B (en) * 1988-10-31 1992-01-27 Semperit Ag Process for the treatment of porcelain patterns for producing articles by dipping
FR2665745A3 (en) * 1990-08-10 1992-02-14 Transfluid Sa Device for actuating means for shutting off a sluice valve with axial movement
EP1340932A1 (en) * 2002-02-27 2003-09-03 Honeywell Ag Armature with adjusting member
WO2007018892A1 (en) * 2005-07-22 2007-02-15 Fisher Controls International, Llc Multi-pitch threaded coupling

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB323126A (en) * 1929-01-09 1929-12-24 Newman Hender And Company Ltd Improvements in, and relating to, valves
GB367489A (en) * 1930-12-09 1932-02-25 Harold Lyall Mason Improvements in valves, taps and the like
GB459915A (en) * 1935-05-13 1937-01-18 Const D App A Gaz S A Improvements in or relating to valves with a conical obturator
GB742579A (en) * 1952-05-29 1955-12-30 Sydney Smith & Sons Nottingham Improvements in fluid valves
GB925555A (en) * 1960-01-04 1963-05-08 Domer Scaramucci Mud valve
GB937050A (en) * 1959-11-14 1963-09-18 Central Nat De La Rech Scient An improved fluid control valve device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB323126A (en) * 1929-01-09 1929-12-24 Newman Hender And Company Ltd Improvements in, and relating to, valves
GB367489A (en) * 1930-12-09 1932-02-25 Harold Lyall Mason Improvements in valves, taps and the like
GB459915A (en) * 1935-05-13 1937-01-18 Const D App A Gaz S A Improvements in or relating to valves with a conical obturator
GB742579A (en) * 1952-05-29 1955-12-30 Sydney Smith & Sons Nottingham Improvements in fluid valves
GB937050A (en) * 1959-11-14 1963-09-18 Central Nat De La Rech Scient An improved fluid control valve device
GB925555A (en) * 1960-01-04 1963-05-08 Domer Scaramucci Mud valve

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180040A (en) * 1985-09-02 1987-03-18 Frederick Goodall Operating mechanism for domestic taps
GB2194619A (en) * 1986-08-29 1988-03-09 Shen Chung Shan Automatic water faucet
WO1989003492A1 (en) * 1987-10-08 1989-04-20 Gce Gas Control Equipment Ab Improvements to valves in gas bottles
GB2217436A (en) * 1987-10-08 1989-10-25 Gas Control Equipment Ab Improvements to valves in gas bottles
GB2217436B (en) * 1987-10-08 1992-03-18 Gas Control Equipment Ab Improvements to valves in gas bottles.
DE3890870C2 (en) * 1987-10-08 1994-04-07 Gce Gas Control Equipment Ab M Gas cylinder valve
AT394041B (en) * 1988-10-31 1992-01-27 Semperit Ag Process for the treatment of porcelain patterns for producing articles by dipping
FR2665745A3 (en) * 1990-08-10 1992-02-14 Transfluid Sa Device for actuating means for shutting off a sluice valve with axial movement
EP1340932A1 (en) * 2002-02-27 2003-09-03 Honeywell Ag Armature with adjusting member
DE10208540A1 (en) * 2002-02-27 2003-09-11 Honeywell Ag Fitting with adjusting element
WO2007018892A1 (en) * 2005-07-22 2007-02-15 Fisher Controls International, Llc Multi-pitch threaded coupling

Also Published As

Publication number Publication date
GB8305680D0 (en) 1983-03-30

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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)