GB1593356A - Diaphragm valve - Google Patents

Diaphragm valve Download PDF

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Publication number
GB1593356A
GB1593356A GB2398278A GB2398278A GB1593356A GB 1593356 A GB1593356 A GB 1593356A GB 2398278 A GB2398278 A GB 2398278A GB 2398278 A GB2398278 A GB 2398278A GB 1593356 A GB1593356 A GB 1593356A
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GB
United Kingdom
Prior art keywords
valve
diaphragm
elements
movement
rib
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.)
Expired
Application number
GB2398278A
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.)
FIP Formatura Iniezione Polimeri SpA
Original Assignee
FIP Formatura Iniezione Polimeri SpA
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 FIP Formatura Iniezione Polimeri SpA filed Critical FIP Formatura Iniezione Polimeri SpA
Publication of GB1593356A publication Critical patent/GB1593356A/en
Expired 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
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • F16K7/126—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm the seat being formed on a rib perpendicular to the fluid line
    • 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
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52491—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a diaphragm cut-off apparatus

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Fluid-Driven Valves (AREA)

Description

(54) DIAPHRAGM VALVE (71) We, F.I.P. FORMATURA IN IEZIONE POLIMERI S.p.A., an Italian Company of Casella (Genoa), Italy, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a diaphragm valve.
It is known that diaphragm valves have a valve body to be inserted in a duct, the valve body having as its closing element a diaphragm of resilient material, such as rubber or the like, suitably reinforced if necessary. Such a diaphragm is urged against a suitable seat or is moved away from it by means of a valve operating device which, in conventional diaphragm valves, comprises a screw-threaded rod which is screwed in either direction into a suitable threaded fixed sleeve and the lower end of which is connected to the diaphragm in question.
The main drawback of diaphragm valves of the above-mentioned kind is that to move the valve from its closed position to its open position it is necessary to rotate the screwthreaded rod a plurality of times.
Furthermore, it is not possible, unless auxiliary indicators are used, to determine whether the valve in question is actually opened or closed by observing the valve from the outside.
An object of the present invention is to provide a diaphragm valve in an improved form.
According to the present invention there is provided a diaphragm valve comprising a valve body,. an inlet, an outlet, a closable path in the valve body interconnecting the inlet and the outlet and a diaphragm movable in the valve body between a first position in which it closes said path and a second position in which it opens said path, there being further provided a valve operating assembly comprising first and second elements having opposite interengageable surfaces, the first element being mounted in the valve body for angular movement but against axial movement and the second element being connected to the diaphragm and mounted in the valve body for axial movement but against angular movement, the opposite faces of the first and second elements each having an annular camshaped peripheral rib so that upon angular movement of the first element in one of two opposite angular directions the second element and thus the diaphragm will undergo axial movement in one of two opposite axial directions to thereby open or close the path, one of the elements being provided inside its respective rib with an extension projecting inside the rib of the other element said extension having at least one groove shaped to repeat the relative movement of the two elements, and the other element being provided with at least one pin projecting into the or each groove.
The invention will now be more particularly described with reference to the accompanying drawings, wherein: Figure 1 is a cross-sectional view of one embodiment of a diaphragm valve in accordance with the invention, taken along the axis of its shutter and on a plane parallel to the direction of the duct in which the valve is inserted, the valve being shown in its closed position; Figure 2 is a cross-sectional view taken along the line II-II of Figure 1; Figure 3 is a cross-sectional view similar to Figure 2 but showing the valve in its open position; Figure 4 is a cross-sectional view taken along the line IV-IV of Figure 1 and showing only the body of the shutter; Figure 5 is a cross-sectional view taken along the line V-V of Figure 1;; Figures 6 and 7 show planar developments of the lateral surface of the body of a valve operating assembly comprising two ele mcnts for the open and closed positions of the valve; and Figure 8 is similar to Figure 7 but shows only the lower element of the valve operating assembly.
Referring to the drawings, the diaphragm valve shown therein has a body of a conventional type and comprising a sleeve 10 and a bell or cap 20. The sleeve 1() has a throughopening 11 facing the cap 20 and a neck underncath the opening. the neck being formed by an inwardly extending depression of the side wall of the sleeve in front of the opening 11.
Such a depression thus forms a partition 12 in the duct in which the valve is inserted.
The edge of the partition 12 faces the opening 11 and the cap 20 and forms a valve seat for an resiliently yieldable diaphragm 40 which is sandwiched between the cap 20 and the edges of the opening 11 of the sleeve 10.
A valve operating assembly, which is generally indicated by 30, includes a control rod 31 frecly rotatable through the upper end of the cap 20. The control rod 31 whose upper end is fixed to a control hand wheel or handlc, not shown. is rigid in rotation with a first element 32 which can undergo angular displacement with respect to the cap 2() but cannot cffcct axial displacement relative thereto. Below the first element 32 a second element 33 is provided whose bottom is fixed to the centre of the diaphragm in any suitable manncr, e.g. by means of a screwthreaded pin 34 shown in Figure 3.
The second element 33 has lugs 35 which are received in respective vertical grooves 36 formed in the inncr surface of the cap 2().
Thus, the second or lower element 33 of the valve operating assembly 30 is free to move in its axial direction but is prevented from undergoing angular displacement. Since the lower element 33 of the assembly 30 is designed to move in an axial direction, its lateral surface, except for the lugs 35, is advantageously cylindrical.
In the illustrated embodiment, the lower end of the upper clement 32 of the assembly 30 is also cylindrical. Raising of the lower element 33 results in the diaphragm 40 being lifted away from the upper edge of the partition 12 which acts as a valve seat. In this position the valve is open. Upon lowering the lower element 33, the diaphragm 40 is urged towards and against the valve seat 12, thereby closing the valve.
To transform angular movement of the upper element 32 into an axial movement of the lower element 33, the opposite faces of the two elements havc, annular cam-shaped ribs 132 and 133. The cam profile which is illustrated as a planar development in Figures 6, 7 and 8, comprises a first section 51, 61 extending in a plane transverse to the axis of the valve, as inclined section 52, 62, a second transverse section 53, 63, and a section 54, 64 parallel to the axis of the valve.
The annular rib 133 has an upwardly extending projection 65 in the region of the junction between the axial section 64 and the first transverse section 61. Accordingly, the annular rib 132 has a downwardly extending projection 55 in the region of the junction between the second transverse section 53 and the axial section 54. The projections in question are designed to form abutments to delimit limit positions for the two elements when the valve is in its closed position. A corresponding limit position of the two elements when the valve is in its open position is attained when the two axial sections 54 and 64 of the two profiles 132 and 133 abut one against the other.
The operation is as follows. When the valve is in the open position illustrated in Figure 6, the two inclined sections 52 and 62 of the profile of the ribs 132 and 133 are in contact with each other; in mutual contact also are the axial sections 54 and 64 of the two sections in question.
If the operator wishes to further rotate the rod 31 in the opening direction of the valve he is prevented from doing so by the engagement of the two surfaces 54 and 64.
In that position, i.e. valve in its open position, the projection 55, which is rounded to reduce friction, rests against the second horizontal section 63 of the profile of the lower element 33. In that position the lower element 33 is pushed upwards by hydraulic pressure applied to the lower surface of the diaphragm and by return means described below.
By rotating the rod 31 in the closing direction of the valve the upper element 32 is displaced angularly relative to the lower element 33 in the direction indicated by an arrow F in Figure 6. The annular ribs 132 and 133 slide along the inclined sections 52 and 62 and since the lower element 33 cannot move angularly it is urged downwards while the inclined surfaces 52 and 62 are in contact with each other. When, while continuing angular displacement the upper element 32, contact between the inclined surfaces 52 and 62 ceases, the horizontal surfaces 61 and 53 come into contact with each other and. while the upper element 32 is angularly displaced further, the relative lowering movement of the lower element 33 terminates. When the horizontal surfaces 61 and 53 completely overlap. the projection 55, on the one hand, and the projection 65, on the other hand, prevent any further relative angular movement of the two elements 32 and 33.
Advantageously, as shown in the drawings the section of the profile of the projection 65 which is to abut against the inclined surface 52 comprises a straight section parallel thereto and the same applies for the section of profile of the projection 55 designed to abut against the inclined surface 62 of the lower element. In the embodiment shown in the drawings, the profile 51, 52, 53, 54, 55, on the one hand, and the profile 61, 62, 63, 64 and 65, on the other hand, are repeated twice along the circumference of the ribs 132 and 133. This means that, to bring the valve from its open position to its closed position and vice versa, the angular displacement of the shaft 32, and thus the relative angular displacement of the elements 32, 33, occurs through 90". Such movement is less than in previously known diaphragm valves.Moreover, because the handwheel or other control handle for the shutter undergoes less than one revolution it is possible to determine at any time whether the valve is in a closed, intermediate or open position. Obviously the profiles 51 to 55, on the one hand, and the profiles 61 to 65, on the other hand, could be repeated only once or more than twice along the circumference of the ribs 132 and 133. This means that to move the valve from its closed position to its open position and vice versa, the shaft 31 could be displaced angularly in one case through 1800 and in the other case through 60 , 45" and so on. The solution illustrated in the drawing is preferred.
To return the valve from its closed posi- tion to its open position, when the resilience of the diaphragm is low, the resilience naturally acting to return the valve to its open position, when the pressure of the flowing fluid is low, the fluid pressure acting in the sense of opening the valve, or when sticking of the diaphragm to its seat is feared after a prolonged closing period, the lower shutter element 33 comprises radially inwardly of the annular rib 133 an extention 70 formed with a groove 71 which repeats the relative movement of the two elements 32 and 33 between the open and closed positions. A pin 72 passing through the annular rib 132 is arranged to slide along the groove 71.
Thus, when a relative movement occurs resulting in the elements 32 and 33 being moved to the position illustrated in Figure 6, the pin 72 and the rib 71 inevitably cause axial approaching movement between the two elements 32 and 33.
WHAT WE CLAIM IS: 1. A diaphragm valve comprising a valve body, an inlet, an outlet, a closable path in the valve body interconnecting the inlet and the outlet and a diaphragm movable in the valve body between a first position in which it closes said path and a second position in which it opens said path, there being further provided a valve operating assembly comprising first and second elements having opposite interengageable surfaces, the first element being mounted in the valve body for angular movement but against axial movement and the second element being connected to the diaphragm and mounted in the valve body for axial movement but against angular movement, the opposite faces of the first and second elements each having an annular camshaped peripheral rib so that upon angular movement of the first element in one of two opposite angular directions the second element and thus the diaphragm will undergo axial movement in one of two opposite axial directions to thereby open or close the path, one of the elements being provided inside its respective rib with an extension projecting inside the rib of the other element said extension having at least one groove shaped to repeat the relative movement of the two elements, and the other element being provided with at least one pin projecting into the or each groove.
2. A diaphragm valve as claimed in claim 1, wherein the valve body comprises a sleeve having a lateral opening, a valve seat formed by an edge of a transverse partition in the sleeve and adjacent the opening, and a cap open at one end, the diaphragm being interposed between said one end of the cap and the peripheral edge of the opening in the sleeve and the cap having a bore in its other end through which bore passes a rotatable member for controlling the valve operating assembly.
3. A diaphragm valve as claimed in claim 1 or claim 2, wherein the cam profile of each cam-shaped rib comprises a first section extending in a transverse plane to the axis of the valve operating assembly, a second helical inclined section, a third transverse section, and a fourth straight section extending in an axial direction and having a length which is equal to the difference in height as viewed in an axial direction of the helically inclined section.
4. A diaphragm valve as claimed in claim 3, wherein the cam profiles of the first and second elements are identical to each other.
5. A diaphragm valve as claimed in claim 3 or 4, wherein, in the region of the junction between the axial section and the first transverse section, each cam profile has a projection facing the other element.
6. A diaphragm valve as claimed in anyone of claims 3-5, wherein the arrangement of said four sections defining each cam profile is repeated at least once around the edge of the corresponding annular peripheral rib.
7. A diaphragm valve as claimed in
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. Advantageously, as shown in the drawings the section of the profile of the projection 65 which is to abut against the inclined surface 52 comprises a straight section parallel thereto and the same applies for the section of profile of the projection 55 designed to abut against the inclined surface 62 of the lower element. In the embodiment shown in the drawings, the profile 51, 52, 53, 54, 55, on the one hand, and the profile 61, 62, 63, 64 and 65, on the other hand, are repeated twice along the circumference of the ribs 132 and 133. This means that, to bring the valve from its open position to its closed position and vice versa, the angular displacement of the shaft 32, and thus the relative angular displacement of the elements 32, 33, occurs through 90". Such movement is less than in previously known diaphragm valves.Moreover, because the handwheel or other control handle for the shutter undergoes less than one revolution it is possible to determine at any time whether the valve is in a closed, intermediate or open position. Obviously the profiles 51 to 55, on the one hand, and the profiles 61 to 65, on the other hand, could be repeated only once or more than twice along the circumference of the ribs 132 and 133. This means that to move the valve from its closed position to its open position and vice versa, the shaft 31 could be displaced angularly in one case through 1800 and in the other case through 60 , 45" and so on. The solution illustrated in the drawing is preferred. To return the valve from its closed posi- tion to its open position, when the resilience of the diaphragm is low, the resilience naturally acting to return the valve to its open position, when the pressure of the flowing fluid is low, the fluid pressure acting in the sense of opening the valve, or when sticking of the diaphragm to its seat is feared after a prolonged closing period, the lower shutter element 33 comprises radially inwardly of the annular rib 133 an extention 70 formed with a groove 71 which repeats the relative movement of the two elements 32 and 33 between the open and closed positions. A pin 72 passing through the annular rib 132 is arranged to slide along the groove 71. Thus, when a relative movement occurs resulting in the elements 32 and 33 being moved to the position illustrated in Figure 6, the pin 72 and the rib 71 inevitably cause axial approaching movement between the two elements 32 and 33. WHAT WE CLAIM IS:
1. A diaphragm valve comprising a valve body, an inlet, an outlet, a closable path in the valve body interconnecting the inlet and the outlet and a diaphragm movable in the valve body between a first position in which it closes said path and a second position in which it opens said path, there being further provided a valve operating assembly comprising first and second elements having opposite interengageable surfaces, the first element being mounted in the valve body for angular movement but against axial movement and the second element being connected to the diaphragm and mounted in the valve body for axial movement but against angular movement, the opposite faces of the first and second elements each having an annular camshaped peripheral rib so that upon angular movement of the first element in one of two opposite angular directions the second element and thus the diaphragm will undergo axial movement in one of two opposite axial directions to thereby open or close the path, one of the elements being provided inside its respective rib with an extension projecting inside the rib of the other element said extension having at least one groove shaped to repeat the relative movement of the two elements, and the other element being provided with at least one pin projecting into the or each groove.
2. A diaphragm valve as claimed in claim 1, wherein the valve body comprises a sleeve having a lateral opening, a valve seat formed by an edge of a transverse partition in the sleeve and adjacent the opening, and a cap open at one end, the diaphragm being interposed between said one end of the cap and the peripheral edge of the opening in the sleeve and the cap having a bore in its other end through which bore passes a rotatable member for controlling the valve operating assembly.
3. A diaphragm valve as claimed in claim 1 or claim 2, wherein the cam profile of each cam-shaped rib comprises a first section extending in a transverse plane to the axis of the valve operating assembly, a second helical inclined section, a third transverse section, and a fourth straight section extending in an axial direction and having a length which is equal to the difference in height as viewed in an axial direction of the helically inclined section.
4. A diaphragm valve as claimed in claim 3, wherein the cam profiles of the first and second elements are identical to each other.
5. A diaphragm valve as claimed in claim 3 or 4, wherein, in the region of the junction between the axial section and the first transverse section, each cam profile has a projection facing the other element.
6. A diaphragm valve as claimed in anyone of claims 3-5, wherein the arrangement of said four sections defining each cam profile is repeated at least once around the edge of the corresponding annular peripheral rib.
7. A diaphragm valve as claimed in
anyone of the preceding claims, wherein the second element is provided with outwardly projecting lugs arranged to be received in respective axial grooves formed in the inner side wall of the valve body so as to prevent it from undergoing angular displacement.
8. A diaphragm valve as claimed in anyone of the preceding claims wherein the extension is provided on the second element.
9. A diaphragm valve substantially as herein described with reference to and as shown in the accompanying drawings.
GB2398278A 1977-09-07 1978-05-30 Diaphragm valve Expired GB1593356A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1276077A IT1090269B (en) 1977-09-07 1977-09-07 DIAPHRAGM VALVE WITH CAM CONTROL

Publications (1)

Publication Number Publication Date
GB1593356A true GB1593356A (en) 1981-07-15

Family

ID=11143138

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2398278A Expired GB1593356A (en) 1977-09-07 1978-05-30 Diaphragm valve

Country Status (4)

Country Link
JP (1) JPS5449617A (en)
GB (1) GB1593356A (en)
IT (1) IT1090269B (en)
NL (1) NL7808575A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006093658A1 (en) * 2005-03-01 2006-09-08 Itt Manufacturing Enterprises, Inc. Quarter-turn diaphragm valve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61123865U (en) * 1985-01-22 1986-08-04
JPH0380163U (en) * 1989-12-06 1991-08-16
US5807075A (en) * 1993-11-23 1998-09-15 Sarcos, Inc. Disposable ambulatory microprocessor controlled volumetric pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006093658A1 (en) * 2005-03-01 2006-09-08 Itt Manufacturing Enterprises, Inc. Quarter-turn diaphragm valve
US7255324B2 (en) 2005-03-01 2007-08-14 Itt Manufacturing Enterprises, Inc. Quarter-turn diaphragm valve

Also Published As

Publication number Publication date
JPS5449617A (en) 1979-04-19
IT1090269B (en) 1985-06-26
NL7808575A (en) 1979-03-09

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee