US3115892A - Flow controller - Google Patents

Description

N. BREW-ER FLOW CONTROLLER Dec. 31, 1963 2 Sheets-Sheet 1 Filed Oct. 11, 1954 fldww 5 E LF ACTUATED FLOW CONTROLLER flow) P .w n M F wiz W m M WY 0 B Z a 1m 9 l m z #m N. BREWER FLOW CONTROLLER Dec. 31, 1963 2 Sheets-Sheet 2 Filed Oct. 11, 1954 1 a @Qx A i m g V. .f may fi j 6 7 6 A l R T005249 IN VEN TOR. I144 7/144/Y/[Z EP'WE/f' BY i ATTU/P/VEX United States Patent 3,115,892 FLOW CONTROLLER Nathaniel Brewer, Newtown, Pa, assignor to Fischer & Porter Company, Hatboro, Pa, a corporation of Pennsylvania Filed Oct. 11, 1954, Ser. No. 461,307 6 Claims. (Cl. 137-501) The present invention relates ,to automatic or self-operated flow-controllers or flow-regulators which may be either manually set to any desired flow-rate setting (within the flow-range for Which the controller is designed by its size and proportions) or whose flow-rate setting may be effected by an air-motor such as, for instance, a diaphragm or siphon type air-motor, so that the flow-rate setting of the flow-controller may be fixed (and varied) from time to time responsive to the air-pressure imposed upon the airmotor from some remote control-point; such air pressure being that of any pneumatic control system.

For the purpose of illustrating the invention, there are shown in the accompanying drawings forms thereof whic are at present preferred, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized and that the invention is not limited to the precise arrangements and organizations of the instrumentalities as herein shown and described.

In the accompanying drawings, in which like reference characters indicate like parts,

FIGURE 1 represents a perspective view of a manuallyset flow-controller of the present invention with the inlet at the bottom and the outlet at the top, as it would be installed in a vertical pipe-line.

FIGURE 2 represents a side elevational view of the aforesaid flow-controller disposed as it would be mounted in a horizontal pipe-line with the dial and manual-setting knob and dial facing upwardly.

FIGURE 3 represents a section on line 33 of FIG- URE 1 but with the flow-controller disposed as in FIG- URE 2, with only the housing in section.

FIGURE 4 represents a section similar to that shown in FIGURE 3, but with all parts fully sectioned.

FIGURE 5 represents an end elevational view on line 55 .of FIGURE 4.

FIGURE 6 represents a vertical cross-sectional view, similar to that shown in FIGURES 3 and 4, of an airmotored flow-controller of the present invention of the type in which the air-pressure closes the governing orifice in the fiow-controller of the present invention.

FIGURE 7 represents a fragmentary cross-sectional view, similar to that shown in FlGURE 6, but of the airrmotored flow-contnoller ofthe type in which the air-pres sure opens the governing orifice.

FIGURE 8 represents a perspective view, partly in section, of the orifice-governing sleeve of the form of construction shown in FIGURE '7.

FIGURE 9 represents a bottom view of the sleeve shown in FIGURES 7 and 8.

In one embodiment, the flow-controller of the present invention is manually set or adjusted to the selected flow-rate, as, for instance the embodiment illustrated in FIGURES 1 to 5, inclusive, while in'another embodiment, the flow-controller of the present-invention may be set or adjusted to a desired flow-rate from a remote point, by a pneumatic motor or pneumatic-actuator or operator, whose pneumatic input is derived from some remote control point.

In both embodiments, however, the main elements of the controller are generally the same, as will be seen from the following description and the accompanying drawings.

In the manually set flow-controller of the present invention, as Well as in the remote-set embodiment of the Ice present invention, the controller includes a main body 1i having an inlet 11, an inlet chamber 12, a flow-controlvalve chamber 13 communicating with the inlet chamber .12 through the threaded passageway 14, an orifice-valve chamber 15 in direct communication with the flow-controlvalve chamber 13, a stationary orifice-forming opening 16 on the down-stream side of the orifice-valve chamber 15, opening into the down-stream or discharge chamber 17, which in turn communicates with the down-stream or discharge-port or threaded opening 13.

A spring-chamber 19 is formed in the main body 10 of the controller, in direct communication with the flowcontrol-valve chamber 13. The outer end of spring-chamher 19 is closed by a closure plate or cap-plate 20 which is bolted to the flange 21 of the housing '10 :by means of four bolts 22 extending through four holes 23 in the capplate 2% and being threaded into corresponding threadedopenings 24 in flange 21 of the housing 10. An annular ringreceiving groove '25 is fiormed either in the face of the flange 21 or in the juxtaposed face of the closure-cap 2t, and into this ring-receiving groove, an O-ring type packing or sealing ring 26- is placed, of suitable dimension, so that it is adequately compressed when the cap 2% is screwed tightly against the flange 21, so as to form a fluid-seal bet-ween the flange 2.1 and the cap 20.

A threaded hole 27 may be formed in the cap 20, which is normally closed by a screw-threaded drain-plug 28 (FIGURE 6). This opening may be used to drain the fiow controller of liquid whenever necessary, or may be otherwise used.

A communicating passageway 29 is formed in the wall intervening the down-stream chamber 17 and the springchamber 19, so as to maintain a permanent and free comununication between these two chambers.

A stationary valve-sleeve 3d open at its up-stream and closed at its down-stream end .and haying a series of circumferentially distributed outlet ports 31 extending radially therethrough near the closed down-stream end thereof, is screw-threadedly (or otherwise) stationarily mounted in the passageway 14, in axial alignment with the generally cylindrical spring-chamber 19; said sleeve fill having a stop-flange 32 serving to fix its position, axially, in relation to the passageway 14, and serving as a stop, to limit the motion of the movable valve-sleeve 33, which is slidably mounted on the stationary-valve-sleeve 30.

The movable valve-sleeve 33 is provided with acorresponding number of lantern-shaped valve-ports 3 4, which coact with the stationary ports 31, to regulate the flow through the flow-controller; together forming a flowthrottling valve.

Within the up-stream end of the spring-chamber 19 a cylindrical sleeve 35 is mounted, and held in place, against the slight inturn flange 36 of the housing, either by means of an adjustable post 37 screw-threadedly mounted in the cap 2t), as at 38, or the sleeve 35 maybe held in place by providing an annular groove in the wall of the springchamber 19 immediately adjacent to the down-stream end of the sleeve 3i and placing into such groove an outwardly expanding split annular retainer-ring of spring metal, the inner periphery of which ring will overlap the down-stream end of the sleeve 35 sufficiently to bar its axial movement within the spring-chamber 19.

To the lower or down-stream end of the movable valvesleeve 33, a flange 39 is secured (by being screw-threaded thereto or otherwise sectu'ed thereto). To the flange 39 a piston-like disc 40, flat annulus shaped, is loosely secured, that is, so that it can adjust readily in radial directions, in relation to the flange 39 by being held between the doWn-stream side of the flange 39 and the cup-shaped spring-abutment washer or plate 41; the springabutment plate 41 and the flange 39 being held together by a series of counterpoints 42, or the like, extending through corresponding apertures in the flange 39 and plate 41, within the inner diameter of the annulus shaped disc 49.

Two generally co-axially disposed and nested helical compression springs 43 and 44 are interposed between the cap and the spring-seat plate 41. The outer spring is held in coaxial relationship at its outer end by the cylindrical wall 45 of the spring-recess in the cap 20, While at its inner end it is generally centered by the cylindrical flange of the spring-seat 41. The inner spring 43 is centered by the cylindrical wall 46 of the inner springseating recess in the cap 20, while its outer end is centered by the cylindrical extension of the plate 39 (as shown in FIGURE 4).

Within the cylindrical orifice-valve chamber 15 a generally cylindrical rotatable sleeve-shaped orifice-valve 47 is disposed. The inner end of this tubular or sleeveshaped orifice-valve is open, while its outer end is closed and is riveted or otherwise permanently secured to the reduced-diameter portion 48 of the valve stem 49, preferably with a metal washer 50 intervening the fiat closed end of the valve-sleeve 47 and the shoulder interveing the reduced-diametered portion 48 of the valve-stem and the main valve-stem 49.

Valve-stem 49 passes through the co-axial opening 51 in the bushing 52, which is screw-threaded into the opening 53 of the housing 10, co-axially in relation to the orifice-valve chamber 15. An annular ring-receiving recess 54 is provided in the inner end of the bushing and a similar annular ring-receiving recess 55 is provided in the housing, at the outer end of the threaded opening 53, and into these recesses similar O-rings 56 and 57, of suitable size, are placed for effecting a seal between the valve-stem 39 and the bore 51 of the bushing 52, and for efiecting a similar fluid-tight seal between the bushing 52 and the housing 10.

The housing 10 is provided with two or four lugs 58, spaced from each other as at the four corners of a square, and these lugs are provided with threaded opening 59, for the reception of mounting screws 60, by which the controller may be mounted on any suitable instrumentpanel or other panel 61. The panel 61 may be vertical, horizontal or may be otherwise disposed. By this means the controller may be mounted in any position on the panel. Thus, for instance, when mounted on a vertical panel, it may be so mounted that the axis of the inlet and outlet openings 11 and 18 is horizontal, or so that said axis is vertical or in any position between horizontal and vertical, and with either inlet or outlet facing in either direction. The dial 62 may then be secured by means of screws 63, so as to place the scale 64 thereof in any direction desired.

To the outer end of the valve-stem 49 a handle or knob 65, having a pointer 66, is secured by a set screw 67 or the like. The central opening 68 in the dial-plate 62 is provided with an enlargement through one half of the circle, as at 69, in which the stop-pin 70 may move through approximately 180, to correspond with the scale 64; the ends of the enlargement 69 serving as stops, to limit the pin 70 and hence the knob 65 to 180 motion.

The orifice-valve-sleeve 47, is provided with a sideopening 71 therein, extending through approximately 180 around the cylindrical sleeve 47; one edge, preferably the lower edge 72 of said opening being horizontal while the other edge 73 is at an incline, so that the turning of the sleeve 47, is relation to the stationary orifice-opening 16, will vary the area of the opening 16 which is uncovered by the solid portions of the sleeve and which is thus placed in communication with the opening 71 of the sleeve. Thus, the effective area of the orifice is varied between the inclined edge 73 of the opening 71 and the edge of the fixed orifice-opening 16.

The liquid entering through the inlet-opening 11 passes into the stationary valve-sleeve 30, in the direction of the arrows 74, and radially out through the variably registering openings 31 and 34, in the direction of the arrow 75, and thence into the open end of the sleeve 47 and through the orifice created between the edge of the openings 16 and the edge 73 of the sleeve-opening 71, in the direction of the arrow 76 and thence out through the outlet-opening 18.

The orifice, created as aforementioned, between the inclined edge 73 and the edge of the opening 16, serves to create a pressure-drop, so that the pressure on the upstream side of such orifice (namely inside the sleeve 47 and in the chamber 13) is higher than the pressure on the down-stream side of the said orifice (namely than in the chamber 17).

As the down-stream side of the orifice, namely, the chamber 17, is in free communication with the springchamber 19 (through the passageway 29, therefore a pressure-differential is maintained on the opposite sides of the disc 49. This pressure-differential tends to move the disc 45} against the force of the springs 43 and 44, and thus move the lantern-ported valve-sleeve 33 in the direction of the arrow 77. As the sleeve 33 is moved in the direction of the arrow 77, the lantern-shaped valveports 34 go more and more out of registration with the stationary ports 31, so as to tend to reduce the flow through said ports. As the flow reduces, the pressuredrop across the aforementioned orifice also reduces and hence the pressure-differential on the opposite sides of the disc 40 is likewise reduced, and the springs tend to move the sleeve 33 into the position where the ports 31 and 34 will be more fully in registration with each other and thus permit greater flow.

In this way a balance is maintained, and hence a constant flow is maintained.

By turning the sleeve 47, by the knob 65, the controller may be set to any flow within the maximum and minimum of its range, which may preferably be indicated on the scale 64 as a percent of the capacity of the system.

In the embodiment shown in FIGURES 6 to 9 inclusive, the panel 61 and the bushing 52 are removed (along with the dial-plate 62 and knob 65) and the Valve-stem 49 and valve-sleeve 47 are likewise removed, and in their place a bushing 80 is threaded into the opening 53 as shown in FIGURES 6 and 7. The bushing 80 serves as a stufiing gland and also motor-mounting. Thus, between the shoulder 81 of the bushing and the nut 82, threaded onto the external threads of its reduced-diametered portion 83, the ring 84 of the motor-supporting yoke 85 is secured. Upon the motor-yoke 85 any conventional pneumatic-actuator 86 is carried. In the particular embodiment shown, the actuator is a diaphragm type air-motor or pneumatic actuator, in which a corrugated diaphragm 87 (or sylphon tube) is sealingly secured between the flanges 88 and 89 of the two halves 90 and 91 of the housing, with the valve stem 92 connected, at its outer end, to the movable pneumatic actuator-element, so that air pressure (or vacuum) applied to the inlet opening 93 of the actuator 86 will move the valvestem 92 in one direction or the other; the air-pressure or vacuum being counter-balanced or opposed by a suitable spring (not shown) within the actuator 86.

The valve-stem 92 passes through the stufiing-gland-nut 94, and through the packing-rings 95 and 96, into the orifice-valve-chamber 15. To the inner end of the valvestem 92, a generally cup-shaped orifice-valve 97 or 93 is secured, by screw or riveting. If it is intended to maintain a greater flow with a lower air-pressure applied to the pneumatic actuator 86 (or to reduce the orifice at 16 with increase of such air pressure) then the orifice-valve 97 is used, which is a cylindrical member whose inner edge coacts with the lower edge of the opening 16, as in FIGURE 6, while if it is desired to increase the flow with an increase of air-pressure applied to the pneumatic actuator 86 (or to increase the orifice at 16 with increase in air-pressure) then the orifice-valve 98 (shown in FIG- URES 7 to 9) is used. The orifice-valve 98 is also cupshaped but with its open end at the top (instead of its open end being at the bottom as in FIGURE 6) and with a series of openings 99 in its otherwise closed bottom, and the axial dimension of its cylindrical portion is substantially greater than the diameter of the opening 16, so that it can fully close said opening, and so that the uncovering of said opening is achieved by moving the orifice-valve 98 downwardly (in FIGURE 7), as contradistinction to the valve 97 which does not ever have to fully cover the opening 16 but merely to pass its lower edge, in order to shut off the whole flow.

A linear scale 100 is mounted on the yoke 85 of the pneumatic actuator 86, and the thin-edged indicator-disc or pointer 101 is mounted on the valve-stem 92, in proper juxtaposition to the scale 1% to indicate the percent of the flow-capacity to which the controller is set at any time (by the pneumatic pressure).

To provide lubrication between the packing-rings 5 and the valve-stem 92, the metallic ring 96 may be interposed between the non-metallic rings 95 above and below the metallic ring (or other hard ring 56) being provided with an annular groove on the outside and with a series of radial openings therethrough, for the passage of lubrication. At a point in alignment with said ring 96, a threaded opening is provided in the bushing 80, into which any suitable lubricator 102 which may be screwthreadedly secured.

In the flow-controller of the present invention, an intermediate pressure is maintained on the up-stream side of the orifice (formed between opening 16 and the orificevalve 47, 97 or 58). This intermediate pressure is generally equal to the up-stream pressure of the liquid plus the relatively constant pressure supplied by the springs 43 and 44; the latter pressure being equal to the total force of said springs divided by the area of the disc 4-0.

The inlet (through the variably-registering ports 31 and 34) is throttled responsive to the pressure-differential across the orifice formed between the stationary opening 16 and the orifice-valve (47, 97 or 98).

The setting of the orifice-valve (47, 97 or 98) determines the fiow-rate which is maintained by the controller.

The up-stream pressure of the fluid (in the inlet chamber 12) is balanced by the down-stream pressure in the chamber 17 plus the spring-pressure (created by the springs 43 and 44).

A constant pressure-differential is maintained across the orifice formed by the opening 16 and the orifice- valve 47, 97 or 98. This results in a constant flow-rate. This constant flow-rate will be maintained unless and until the setting of the orifice- valve 47, 97 or 98 is changed (by the knob 65 or by the pneumatic actuator 86).

As the controller of the present invention does not depend on any gravity-loading or weight-loading means, it may be installed with the flow to right or left, upward or downward, or in any other direction. Connections are straight, namely, in-line; no off-setting being required between inlet pipe and outlet pipe connected to the controller.

Panel-mounting, with dial and knob in front, and with controller and other mechanism being in the rear of the panel is also provided by the present construction. When the controller is not mounted on a panel, but merely held in place by the pipes connected to its inlet and outlet, then the panel 61 is replaced by the plate 61-11 which acts as a filler to which the dial-plate 62 is secured.

In place of the post or pin 37, to restrain and hold in position the sleeve 35, as shown in FIGURE 4, the split annular and outwardly-expanding spring-ring 163 may be used, within the annular ring-receiving groove 104 in the wall of the spring-chamber 19; the groove 104 having approximately a semi-circular cross-section.

To keep the knob 65 clear of the dial-plate 62, a helical compression spring 155 may be interposed between the bushing 52 (or the washer 106 thereon), and the underside of the knob 65, as shown in FIGURE 4.

Thus, the flow-controller of the present invention includes a governing-orifice, as, for instance, that formed between the stationary orifice-opening 16 and the cooperating edge of the orifice-valve (47, 97 or 98); which governing-orifice is set to any of its positions, within its setting-range, either manually or by a pneumatic actuator or similar actuator, and also includes a flow-throttling orifice or valve intermediate the inlet 12 and such governing-orifice (the flow-throttling orifice or valve being formed of the stationary valve-sleeve 30 and the movable valve-sleeve 33, with the variably-registering ports 31 and 34 thereof).

The flow-controller of the present invention also includes a setting-mechanism or throttling actuator for the flow-throttling valve, which setting-mechanism includes a movable piston-like member whose one side is exposed to the intermediate-pressure (namely, the pressure between the flow-throttling valve and the governing-orifice), and whose other side is exposed to the down-stream pressure on the down-stream side of the governing-orifice, plus the pressure of the spring or springs; such mechanism being connected to the movable valve-element of the flow-throttling valve or orifice.

By using two springs, relatively heavy, the possibility of the disc 40 and hence the valve-sleeve 33 acquiring a resonant-frequency buzz is minimized.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

Having described the invention, the following is claimed:

1. A flow-controller including an inlet chamber having an inlet opening adapted to be connected to the up-stream side of a pipe-line and an outlet chamber having an outlet opening adapted to be connected to a down-stream side of a pipe-line, a flow-throttling valve-chamber adjacent said inlet chamber, a passageway between said inlet chamber and said flow-throttling valve-chamber, a stationary Valvesleeve affixed in said passageway with its fixed end (in said passageway) being in communication with said inlet chamber, said stationary valve-sleeve having a port means extending radially thereof in the portion thereof which is within said flow-throttling valve-chamber, a piston-re ceiving cylinder-chamber immediately adjacent to said flow-throttling valve-chamber and formed in continuation thereof, a piston reciprocably mounted in said cylinderchamber, a movable valve-sleeve carried by said piston and having radial ports therethrough, said movable valvesleeve and the aforementioned stationary valve-sleeve being telescoped in relation to each other, with their respective ports in registration with each other when said movable valve-sleeve and said stationary valve-sleeve are in their maximum telescoped relation to each other, and said ports gradually going out of registration with each other when said movable valve-sleeve is withdrawn in relation to said stationary valve-sleeve in the direction of said piston, a spring in said cylinder-chamber urging said piston and said movable valve-sleeve in the direction of said stationary valve-sleeve, a passageway intermediate said outlet chamber and said cylinder-chamber on the spring side of said piston, a cylindrical governing-orifice chamber in free communication with said flow-throttling valve-chamber, a fixed port-like passageway intermediate said governing-orifice chamber and said outlet chamber, a cylindrical movable orifice-governing valve-member within said governing-orifice chamber and fitting therewithin and movable therein in relation to said port-like passageway, to form with the latter a variable orifice when moved and positioned in relation thereto, a stem fixed to said cylindrical movable orifice-governing valve-member and extending exteriorly of said flow-controller whereby said valve-member may be positioned in any desired position in relation to said port-like orifice-forming passageway.

2. A flow-controller in accordance with claim 1 in which the orifice-governing valve-member is a sleeve revolvably mounted Within said governing-orifice valvechamber and is open at its end which faces the flowthrottling valve-chamber and has at least one inclined orifice-forming edge in juxtaposition to said port-like passageway, so that the turning of said orifice-governing valve-member and the setting thereof in any desired position will form a variable orifice of desired magnitude be tween said inclined edge and the edge of said port-like passageway.

3. A flow-controller according to claim 2 in which a stufling-gland is provided around the stern of said orificegoverning valve-member and in which a dial is afiixed to the housing of said flow-controller at a right angle to said stem, through which said stem extends, and in which a manually operable handle is afi rxed to the outer end of said stem with a pointer thereon in juxtaposition to said dial.

4. A flow-controller according to claim 1 in which said orifice-governing valve-member is a reciprocable piston having an edge forming an orifice with an edge of said port-like passageway.

5. A flow-controller according to claim 4 in which an air motor is connected to the stem of said orifice-governing valve-member, the housing of said air motor afiixed to the housing of said flow-controller.

6. An automatic pressure-responsive valve for use with flow-restricting orifice in a pipe-line to control the flow of fluid therethrough, and adapted to be mounted in such pipe-line up-strcam of said orifice, said automatic valve including an inlet chamber having an inlet opening adapted to be connected to the up-stream side of said pipeline with respect to said orifice and an outlet chamber having an outlet opening adapted to be connected to the upstream side of said orifice, a flow-throttling valve-chamber adjacent said inlet chamber, a passageway between said inlet chamber and said flow-throttling valve-chamber, a

stationary valve-sleeve affixed in said passageway with its fixed end (in said passageway) being in communication with said inlet chamber, said stationary valve-sleeve having'port means extending radially thereof in the portion thereof which is within said flow-throttling valve-chamber, a piston-receiving cylinder-chamber immediately adjacent to said flow-throttling valve-chamber and formed in continuation thereof, said piston-receiving cylinder-chamber being adapted to be communicatively connected with said pipe-line down-stream of said orifice, a piston reciprocably mounted in said cylinder-chamber, a movable valve-sleeve carried by said piston and having radial ports there through, said movable valve-sleeve and the aforementioned stationary valve-sleeve being telescoped in relation to each other, with their respective ports in registration with each other when said movable valve-sleeve and said stationary valve-sleeve are in their maximum telescoped relation to each other, and said ports gradually going out of registration with each other when said movable valvesleeve is withdrawn in relation to said stationary valvesleeve in the direction of said piston, and a spring in said cylinder-chamber urging said piston and said movable valve-sleeve in the direction of said stationary valve-sleeve.

References Cited in the file of this patent UNITED STATES PATENTS 1,132,095 Hutchison Mar. 16, 1915 1,397,867 Jones Nov. 22, 1921 2,272,684 Vickers Feb. 10, 1942 2,476,720 Gardiner July 19, 1949 2,608,209 Bryant Aug. 26, 1952 2,645,885 Benua July 21, 1953 2,664,102 Coberly Dec. 29, 1953 2,674,847 Davies Apr. 13, 1954 2,702,050 Thomas Feb. 15, 1955 FOREIGN PATENTS 896,214 France Apr. 24, 1944

Claims (1)

1. A FLOW-CONTROLLER INCLUDING AN INLET CHAMBER HAVING AN INLET OPENING ADAPTED TO BE CONNECTED TO THE UP-STREAM SIDE OF A PIPE-LINE AND AN OUTLET CHAMBER HAVING AN OUTLET OPENING ADAPTED TO BE CONNECTED TO A DOWN-STREAM SIDE OF A PIPE-LINE, A FLOW-THROTTLING VALVE-CHAMBER ADJACENT SAID INLET CHAMBER, A PASSAGEWAY BETWEEN SAID INLET CHAMBER AND SAID FLOW-THROTTLING VALVE-CHAMBER, A STATIONARY VALVESLEEVE AFFIXED IN SAID PASSAGEWAY WITH ITS FIXED END (IN SAID PASSAGEWAY) BEING IN COMMUNICATION WITH SAID INLET CHAMBER, SAID STATIONARY VALVE-SLEEVE HAVING A PORT MEANS EXTENDING RADIALLY THEREOF IN THE PORTION THEREOF WHICH IS WITHIN SAID FLOW-THROTTLING VALVE-CHAMBER, A PISTON-RECEIVING CYLINDER-CHAMBER IMMEDIATELY ADJACENT TO SAID FLOW-THROTTLING VALVE-CHAMBER AND FORMED IN CONTINUATION THEREOF, A PISTON RECIPROCABLY MOUNTED IN SAID CYLINDERCHAMBER, A MOVABLE VALVE-SLEEVE CARRIED BY SAID PISTON AND HAVING RADIAL PORTS THERETHROUGH, SAID MOVABLE VALVESLEEVE AND THE AFOREMENTIONED STATIONARY VALVE-SLEEVE BEING TELESCOPED IN RELATION TO EACH OTHER, WITH THEIR RESPECTIVE PORTS IN REGISTRATION WITH EACH OTHER WHEN SAID MOVABLE VALVE-SLEEVE AND SAID STATIONARY VALVE-SLEEVE ARE IN THEIR MAXIMUM TELESCOPED RELATION TO EACH OTHER, AND SAID PORTS GRADUALLY GOING OUT OF REGISTRATION WITH EACH

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