US 1524217 A
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Description (OCR text may contain errors)
Jan. 27, 1925. 1,524,217
F. T. SMALL REGULATING VALVE FOR ARTIFICIAL SILK SPINNING APPARATUS Filed Feb. 5, 192,3
Tc madn SuH W10 7 8 Fr? rmx'm 10 l 5 1; 1 1 From htitttl FREDERICK 'JLRGIUTON SMALL, F SPONIDOIN. NEAR DERBY, ENGLAND, ASSIGNOR T0 AMERICAN CELLULQSE AND CHEMICAL MANUFACTURING COMPANY LIMITED, A
CORYORATIUN OF DELAWARE.
REGULATING- VALVE JFOR ARTIFICIAL-SILK SPINNING APPARATUS.
Application filed February 5, 1923. Serial No. 817,110.
To all whom it may concern:
Be it known that I, FREDERICK TnoUToN SMALL, a subject of the King of Great Britain, ofSpondon, 'n'ear Derby, England,
t have invented certain new and useful Imreceives liquid therefrom, and which thusacts as a measuring device to pass the quantity of fluid required per unit of time, the surplus liquid from the first pump passing through a branch conduit on the connection between the two pumps to one side of the diaphragm valve, the other side of which is exposed to the pressure of the delivery pipe of the second or measuring pump, so that according as vthe pressure in the pipe or connection between thetwo pumps or that in the delivery from the second pump predominates, the diaphragm, by means of a needle or like regulating device which it carries, acts to enlarge or reduce an opening or by-pass through which excess liquid in the branch pipe can escape back into the main supply to the first pump, the pressure between the two pumpsbeing thus kept equal to that in the delivery pipe from the second pump, so that equal pressures are maintained on bothcsides of the second or measuring pump, and if the delivery pressure from this pump varies, the diaphragm valve automatically adjusts the inlet pressure to the same degree. Such apparatus is described in British patent specification No. 182,154.
in such pumping apparatus, which are employed for supplying the spinning solution to the nozzles or jets of artificial silk sinning installations, the regulating diapragm valve is usually arranged horizontally.
to regulating valve 'maticaliy, because it is free to move.
In operation with such apparatus certain difficulties have been found to occur in practlce.
These diliiculties are due fi'rstly to the accumulation of air, during operation, in the upper chamber of the diaphragm valve, namely that in which the orifice or by-pass controlled by the needle or like device of the diaphragm is situated. Secondly the needle or like device of the diaphragm, being fixed positively to the diaphragm, is liable to break in action, this being mainly due to the difllculty of centering the needle or the like in the valve; thirdly the fiat platetype of diaphragm mayfail to seal the by-pass when required, this being often due to grit keeping the two faces apart.
According to the present invention we make the upper chamber of the diaphragm valve that serves to maintainthe pressure between the two pumps equal to that of the delivery from the second pump domeshaped or upwardly dished, the highest point being the outlet or bypass, and l employ a loose or floating valve inserted between the diaphragm and said by-pass outlet. With such an arrangement it is found that air which may be present in the valve chamber or pass into the valve chamber with the liquid can escape immediately the, valve is opened by the needle or the like, owing to the location of the bypass orifice in the top of the domed upper chamber, and the needle valve can also locate itself autollt may be constructed and arranged so that its apex never falls below the valve seat or other valve supporting member. A coil, leaf or other suitable spring is preferably provided between the needle and the valve seat to ensure that the needle operates automatically with the diaphragm.
The accompanying drawings illustrate by way of "bx'ample one form of diaphragm valve comprising all the before mentioned improvements, Fig. 1 being a vertical section and IF ig. 2 a plan of the valve.
lln this form the valve casing is made in upper and lower circular portions 1, 2 fixed together by screws 3 to clamp between them Mill shape as shown.
the rim of a diaphragm 4 of phosphor bronze or like corrosion resisting material, which divides the interior of the valve cas ing into upper and lower chambers 5 and 6. The under face 1 of the upper portion of the valve casin is made of shallow dome is a by-pass union opening through the centre of the crown of the upper valve chamber 5 by its passage 8 and a apted to be connected to a pipe or conduit leading back to the supply side of the first discharge outlet of the second or measuring pump before mentioned, and a tapped disto the artificial silk spinning nozzle.
charge outlet 12 from the valve chamber 6 serves for connection to the delivery pipp loose orfloating needle valve 13 is placed on the diaphragm 4: so as to open and close the bypass orifice 8 accordin as the diaphragm moves under the action 0 the opposing pressures on] the faces of the diaphragm, viz, that in. the connection between the two pumps, and that on the delivery side of the second pump. A coiled spring 14 is fitted between the crown of the dome and the base of the needle valve which is formed by a circular plate or disc 13 resting on the diaphra this base 13 of the needle valve being slightly dished to fit snugly on the slightly dished diaphragm, thereby assisting in preventing fluid from tending to separate the needle valve and the diaphragm. "15 represents a screw plug provided on the top side of the valve casing, and which is removed on starting to allow all the air to. escape quickly from the inside of the valve chamber. This operation is performed when first passing the spinning solution through the valve, to ensure that it is com pletely flooded on starting.
It will be seen that owing to the location of the by-pass-outlet 8 in the crown of the domed upper valve chamber 5, any air which in operation may be present in the valve chamber or pass with the-liquid into the valve chamber, can escape. through the bypass immediately the valve is opened by the needle. Also the loose floating needle valve 13 can locate itself automatically and operates automaticallywith the dia hragm and moreover it is so constructedtliat its apex never falls below the valve seat in the movements of the diaphragm. Further, as the diaphragm can be a full or integral piece without any rivetting or fixin the needle thereto, there is no risk of lea age taking place through the diaphra m. The diaphragm being made of phosp or bronze will alsoresist more efi'ectivel r the corroding action of the artificial sil spinning solutions.
It has been found that with a diaphragm valve constructed in accordance with the invention it is possible to maintain a uniform rate of delivery under a very wide range or variation of pressure or resistance. Thus in arrangements of the kind described in the said British Patent 1821554 it has been found that with the improved diaphragm valve it is ossible to work and maintain a uniform ebit from the second or measuring pump against considerably greater pressures or resistances such as may build up or occur in the delivery of the solution.
What I claim and desire to secure by Letters Patent is:
1. In artificial silk spinning apparatus employing main and measuring pumps of difierent deliveries, a horizontally arranged regulating valve apparatus comprisin a chamber having an upper wall provided with an outlet, a horizontal valve supporting member dividing the chamber into two portions, and a loose valve member controlling said outlet and supported by but separate from the valve supporting member.
2. In artificial silk spinning apparatus employing main and measuring pumps or different deliveries, a horizontally arranged regulating valve apparatus comprising a chamber having an up er wall provided with an outlet, a horizontal diaphragm dividing the chamber into two portions, and a loose valve member controlling said outlet and supported by but separate from the diaphragm.
3.-In artificial silk spinning apparatus employing main anud measuring pumps of different deliveries, a horizontially arranged regulating valve a paratus comprising a chamber having a omed upper wall provided with an outlet, a horizontal diaphragm dividing the chamber into two ortions. and a needle valve member controlling said outlet and supported by but separate from the diaphragm.
4. In artificial silk s unning apparatus employing main and measuring piuups of different. deliveries, a horizontally arranged regulating valve 8. paratus comprising a chamber having a omed upper wall provided with an outlet, a member dividing the chamber into two portions, and a valve controlling said outlet and supported by said member.
5. In artificial silk spinning apparatus employing main and measuring pumps of different deliveries, a horizontally arranged nearer? regulating valve apparatus comprising a chamber having a domed upr wall provided with an outlet, a horizontal diaphragm dividing the chamber into two portions, a
u loose valve member controlling said outlet ill and supported by but separate from the diaphragm, and a spring fitted between the loose valve and the Wall of the chamber adjacent said outlet.
6. 111 artificial silk spinning apparatus employing main and measuring pumps o'l difl'erent deliveries, a horizontally arranged regulating valve apraltus comprising a chamber having an upper wall provided with an outlet, a horizontal dia hra dividing the chamber" into two portions, an inlet for fluid under low pressure in the upper portion of said chamber, an inlet for fluid under high pressure in the lower portion of said chamber, a loose valve member supported by said diaphragm and controlling said out-I lot, and a spring associated "with said valve member.
In testimony whereof I have hereunto subscribed in name.
FRED RICK TRUUTQN SMALL.