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
  • F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
  • F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
  • F16K7/06—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of a screw-spindle, cam, or other mechanical means

Definitions

• the present invention relates to a valve comprising a housing with an inlet and outlet end and there between a conduit providing passage through the housing and having a flexible closing section.
• a valve of the above type is the known membrane valve, wherein a rubber membrane arranged in the conduit is compressed mechanically by an actuator or pressurized air against the bottom of the conduit and thereby shuts off passage through the conduit.
• this valve Due to reduced pressure drop and the simple con- struction of the membrane valve, this valve is commonly, used for viscous or corrosive liquids.
• An object of this invention is to provide a valve having a flexible closing section without the drawback of the known valves of this type.
• the valve of the invention comprises a housing with an inlet and an outlet and there between a conduit provid ⁇ ing passage through the valve, which conduit being closed in a flexible closing section, which section consists of a flexible tubing in at least a part of the conduit; a seat supporting the flexible tubing; and a closing member axially displaceable towards the seat and arranged adjacent to the conduit on the diametri ⁇ cal opposite site to the seat, so that the flexible tubing on axially displacement of the closing member towards the seat completely or partly squeezes the tubing against the seat to control or shut off a fluid stream through the conduit and the valve.
• the valve according to the invention is, in par- ticular, useful in the control of a stream of viscous or corrosive liquids or powders, because the stream has no contact to complicated parts of the valve, which may be damaged upon passage of such stream through the valve.
• the conduit is provided by a flexible tube being part of an external piping.
• the tube runs through the housing via its inlet and outlet.
• a fluid stream is controlled by the closing member, which in form of a rectangular body may be moved by an actuator along the tube towards the seat.
• the seat in form of a rectangular body supports a portion of the tube on the side being diametrically opposite to the closing member.
• edges of the closing member and the seat adjacent to the tube are in line and axially displaced at open position of the valve, so that the edges upon closure of the valve squeeze the tube between them.
• the closing member slides parallel with the tube and/or the conduit on a sliding bar, which prevents radial displacement of the member during movement towards the seat.
• the tube or conduit is at open valve position slightly deflected in that part of the tube or conduit which is between the closing member and the seat.
• this deflection of the tube or conduit is avoided by arranging the sliding bar within the housing with an inclined direc ⁇ tion towards the seat, so that the closing member is detached from the tube or conduit at open valve position.
• the closing member is, thereby, moved in an inclined direc- tion towards the conduit or tube and the seat during * closure of the valve.
• Such an embodiment is, in particular, useful for dosage or control of a stream of highly viscous « liquids or pressurized liquids, whereby pressure drop caused by the deflection of the conduit or tube is desira- 5 bly diminished.
• the inclination of the sliding bar is adjustable by action of e.g. a screw extending into the valve housing, whereby the closing member moving towards the seat adjustable reduces 10 passage through the conduit.
• the closing member is moved by action of an actuator being activated by a pneumatic cylinder installed on the valve housing at the outlet, so that the member is moved axially 15 along the conduit towards the seat arranged at the inlet side of the housing, whereby the flexible tubing is com ⁇ pressed against and along the seat in a direction towards the inlet side.
• the valve according to the invention is, thus, useful for the dosage of a fluid from a pressurized con ⁇ tainer or a pump.
• Fig. 2 is a sectional view similar to that of Fig. 1, but showing the valve at closed position.
• valve 35 The valve shown in Fig. 1 and 2, consists of valve 35 housing 2 with inlet 4 and outlet 6. Flow passage through the valve is provided by conduit 8 between inlet 4 and outlet 6.
• Conduit 8 may be a flexible tubing being part of an external piping from a container or a pump (not shown) and running through housing 2.
• conduit 8 may be composed of a metal tube and a flexible tubing section at outlet 6, resting on seat 10.
• the flexible tubing may be made from a gas and liquid tight plastic material.
• a clos ⁇ ing member 12 is arranged axially displaceable adjacent to conduit 8 on the side being diametrically opposite to seat 10. Member 12 rests via pinching cylinder 14 on conduit 8 and moves on sliding bar 16.
• closing member 12 At open valve position (Fig. 1) , closing member 12 is in an axially displaced position to seat 10, so that the edge of pinching cylinder 14 resting on conduit 18 is substantially in line with the edge of seat 10 being adja- cent to conduit 8.
• the bar is parallel to conduit 8, which in the region of the closing member is in form of a V to allow passage through the valve.
• the position of the bar may be adjusted upwards at the outlet side of housing 2 and downwards at the inlet side by action of screw 28.
• closing member 12 allows passage through the conduit without deflection around closing member 12, which moves in an inclined direction towards conduit 8 and seat 10 during closure of the valve.
• Closing member 12 is activated via actuator 20 by pneumatic cylinder 22, which is arranged at the outlet side of housing 2.
• actuator 20 pushes member 12 on sliding bar 16 axially towards the inlet side and against mechanical stop 26 being in form of an adjustable screw 28.
• Screw 28 is surrounded by coil spring 24, which on one side abuts upon the valve housing and at the other side upon closing member 12.
• pinching cylinder 14 compresses conduit 8 against seat 10, and passage through the conduit is shut off, as shown in Fig. 2.
• conduit 8 is squeezed for a distance along seat 10, whereby there is generated low pressure in conduit 8 at outlet 6 and a portion of a fluid in the conduit is sucked backwards in the conduit.
• the member slides by two or more wheels 18 on the bar.
• a throttle plate 30 which at open valve position can restrict passage through the conduit by partly compressing the conduit against pinching cylinder 14. Throttling can be adjusted by screw ⁇ ing adjustment screw 32 towards plate 30.

Applications Claiming Priority (3)

Publications (1)

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ID=8090181

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• 1992
  • 1992-02-05 DK DK13892A patent/DK13892A/da not_active Application Discontinuation
• 1993
  • 1993-02-04 EP EP93903860A patent/EP0598856A1/de not_active Ceased
  • 1993-02-04 AU AU34925/93A patent/AU3492593A/en not_active Abandoned
  • 1993-02-04 DE DE9314858U patent/DE9314858U1/de not_active Expired - Lifetime
  • 1993-02-04 WO PCT/DK1993/000038 patent/WO1993016308A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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