US2414354A - Measuring apparatus - Google Patents

Description

Patented Jan. 14, 1947 UNITED STATES PATENT OFFICE assignor to Aktiebolaget Latex,

Sweden Stockholm,

Application May 15, 1941, Serial No. 393,549 In Sweden May 3, 1940 The invention relates to an apparatus for dispensing a predetermined measured quantity of a pressure fluid by the actuation of a piston valve which is located in a valve chamber.

The invention may with particularadvantage be used in households to dispense a predetermined quantity of water without the necessity of turning a cock, which is sometimes rendered difficult or even impossible when the cock has been too much tightened to prevent leakage.

Moreover, the invention may be successfully applied to devices for dosing liquids on sale, such as fuel, kerosene, petrol and the like, milk and other fluids.

An essential feature of the invention consists therein that the piston of the piston valve has a pressure surface shutting off the pressure medium entering the apparatus through the inlet and a pressure surface opening a passage for this pressure medium, the closing surface being larger than the opening surface.

The invention is further characterized by the fact that in addition to the inlet for the pressure medium the valve has a main outlet and outlets from the chamber as well as from that portion of the piston casing which islocated on the other side of the piston relative to the chamber and that equal or an average pressure prevails in all these outlets.

The valve chamber is provided with a valve to connect the chamber with its outlet. This valve is adapted to be opened by a button which may be combined with a counter to register its actuation.

The invention is illustrated in the accompanying drawing which is a vertical section elevation of a fluid dispensing .device embodying the same.

In the drawing, the reference numeral I designates a casing which accommodates a main chamber 4 having a larger diameter and a fluid inlet chamber l having a smaller diameter; a main piston 2 is reciprocable in main chamber 4 and piston sleeve 3 connected with the main piston 2 is reciprocable in pressure fluid inlet chamber 55. A feed inlet 5 for the pressure fluid leads into the interior of piston sleeve 3. A main orifice 6 for dispensing the pressure fluid is located in the Wall of inlet chamber I5; this orifice is adapted to be closed and to be opened by piston sleeve 3 upon reciprocation of the main piston 2.

A pressure relief passage 1 is located in casing l above main chamber 4; an outlet passage 2| is connected with the pressure relief passage 1 which is provided with a relief valve l3. A seat 23 for relief valve I3 is mounted in cover 22 of 4 Claims. (Cl. 137-.139)

casing 2. Valve i3 is provided with a frustoconical head it which is connected with a central bypass tube ac and displaceable therewith.

A drainage outlet 8 from main chamber 4 is located underneath the piston to connect this chamber with outlet passage 2|.

Central by-pass tube it] formed. as an extension of the relief valve It, extends through piston 2; a lateral orifice l is provided in the upper end of by-pass tube l0 and this lateral orifice is surrounded by a circular orifice [2, which is adapted to connect the interior of piston sleeve 3 with main chamber 4 and relief passage 1.

The upper and the lower face of piston 2 are designated with numerals l1, 18. Packing rings 4!, t2 are provided to seal the piston 2 and the piston sleeve 3 in the casing. A button or roller [.4 is provided to control valve l3. Main fluid dispensing orifice 6, relief passage 1 from the upper part of chamber 4 and drainage outlet 8 leading from the portion of this chamber underneath piston 2 ar connected with each other by conduit 21.

The above described apparatus is operated in the following manner.

When piston 2 is in the position shown in the drawing and consequently the apparatus is closed, the pressure fluid cannot flow from inlet 5 through the apparatus.

If now button M is actuated in such a manner that the pressure acting on the shutting-off face ll of piston 2 is released the pressure prevailing underneath the piston 2 will act on the opening surface i8 and move the piston upward until it uncovers outlet 6; a direct connection is created with inlet 5 for the pressure fluid and therefore the latter may pass directly through the apparatus to the outlet.

Meanwhile pressure fluid which enters the chamber 4 through orifice ll, tube l0 and orifice i2 will act on the shutting-off surface ll of piston 2 so that it may be moved back against the influence of the pressure fluid entering through inlet 5. This is rendered possible because the chamber located underneath piston 2 communicates with the atmosphere and the shutting-off pressure surface I1 is larger than the opening pressure surface l8.

Accordingly, piston 2 moves downwards and piston sleeve 3 will finally shut off outlet 6 so that the apparatus will be closed again, A predetermined quantity of pressure medium has meanwhile passed through the apparatus. This quantity may be controlled by adjustment of the button 14 so that a larger or smaller portion of orifice l2 will be uncovered.

Valve [3 may be connected with a counter which registers the number of actuations and the number of delivered quantities.

Having now described my invention, What I claim as new and desire to secure by Letters Patent is:

1. An apparatus for dispensing a predetermined accurately measured quantity of a pres-' sure fluid comprising in a casing a main chamber having a larger diameter and a fluid inlet chamber having a smaller diameter, amain piston reciprocable in said main chamber, a piston sleeve connected with said main piston reciprocable in said inlet chamber, a feed inlet for the pressure fluid into the interior of said piston sleeve, a main fluid dispensing orifice in said inlet chamber adapted to be closed and to be opened by said piston sleeve upon the reciprocation of said main piston, a pressure relief passage located in the casing above said main chamher, an outlet passage connected with said relief passage, a relief valve in said relief passage, a seat for said relief valve in said casing, means for controlling the position of said relief valve, a drainage outlet from said main chamber underneath the said piston to connect the said chamber with said outlet passage, a central bypass tube extending through said piston formed as an extension of said relief valve, a lateral orifice in the said by-pass tube and a circular orifice surrounding the same adapted to connect the interior of said sleeve with said main chamber and with said relief passage.

2. An apparatus for dispersing a predetermined accurately measured quantity of a pressure fluid comprising in a casing a main cylindrical chamber having a larger diameter and a fluid inlet cylindrical chamber having a smaller diameter, a main piston, reciprocable in said main cylindrical chamber, a central piston sleeve depending from said main piston reciprocable in said inlet cylindrical chamber, a feed inlet for the pressure fluid into the interior of said piston sleeve, a main fluid dispensing orifice in said inlet chamber adapted to be closed and to be opened by said piston sleeve upon the reciprocation of said main piston, a pressure relief passage located in the casing above said main chamber, an outlet passage connected with said relief passage, a relief valve in said relief passage, a seat for said relief valve in said casing, means for actuating said relief valve, a drainage outlet from said main chamber underneath the said piston to connect the said chamber with said outlet passage, a central by-pass tube extending through said piston formed as an extension of said relief valve, a lateral orifice in said valve tube and a circular orifice surrounding the same adapted to connect the interior of said sleeve with the said main chamber and with the said relief passage.

3. An apparatus for dispensing a predetermined measured quantity of a fluid from a pressure fluid supply line, comprising a piston inserted into said line, a casing for said piston, a main chamber having a larger diameter and a fluid inlet chamber having a smaller diameter in said casing, a differential piston having a larger and a smaller operating surface reciprocable in said main chamber, a tubular sleeve connected with said main piston reciprocable in said inlet chamber, an inlet for the pressure fluid into said inlet chamber, said sleeve extending towards said inlet and having a smaller diameter than said piston, a main outlet for said fluid, said sleeve being reciprocable to regulate the flow of the fluid from said inlet to said main outlet, a tube connecting said main chamber with said fluid inlet chamber, a drainage conduit connected with said main chamber, a release valve for controlling the drained ofi fluid, said piston being adapted upon pressure reduction by said release valve in said main chamber to be moved into the opening position and upon closing of the release valve due to the pressure acting on its larger operating surface to be displaced in the closing position, a seat for said piston sleeve in said inlet chamber, a separate seat for the piston located in said main chamber in such a manner as to permit said piston to rest in the closing position on said seat, to avoid friction at the periphery of said piston and to prevent leakage in the closed position of said piston.

4. An apparatus for dispensing a predetermined measured quantity of a pressure fluid comprising in a casing a main chamber having a larger diameter and a fluid inlet chamber having a smaller diameter, a main outlet for said pressure fluid from said casing, a differential main piston having a larger and a smaller pressure surface reciprocable in said main chamber, a piston sleeve attached to the smaller pressure face of said main piston in such a manner as to take up the difference of said pressure surfaces, said piston sleeve reciprocable in said fluid inlet chamber to regulate the flow of said pressure fluid from said inlet chamber to said mainoutlet, a tube to connect said main chamber and said fluid inlet chamber, a drainage conduit connected with said main chamber, a release valve for controlling the drained off fluid, said piston being adapted upon pressure reduction by said release valve in said main chamber to be moved into the opening position and upon closing of the release valve due to the pressure acting on its larger operating surface to be displaced in the closing position, a seat for said piston sleeve in said inlet chamber, a separate seat for the piston located in said main chamber in such a manner as to permit said piston to rest in the closing position on said seat to avoid friction at the periphery of said piston and to prevent leakage in the closed position of said piston.

LARS ERIK JULIUS BLOMBERG.

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