US1321856A - Ing works - Google Patents

Description

H. SLATER.

AUTOMATIC CHANGE VALVE FOR PRESSES. APPLICATION FILED JAN.25. 1917.

1 221,856. Patented Nov. 18, 1919.

WITNESSES l/VVETOR A TTOR/VEYS nnrrnn sTATns rnrnnr enrich HARVEY SLATER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CHARLES IE. ELMES ENGINEER- ING WORKS, OF CHICAGO, ILLINOIS, A CORPORATION 0L? ILLINOIS.

A'lJ'TOMATIG CHANGE-VALVE FOR PRESSES.

i,s21,s5e. Specification of Letters Patent. Patented Nov. is, rare. 7

Application filed January 25, 1917. Serial No. 144,568.

low to a high pressure feed, in supplying fluid pressure to pressure actuated machines such as the hydraulic pressure used to extract liquids from solid bodies; j v

With one form of such machine it is usual to admit pressure thereto and to control the admission by means of a valve designed to admit the difierent pressures successively, first by admitting a relatively low pressure, say about 500 lbs. per square inch and, when a certain compressive action has been obtained on the material in the machine to change automatically so as to admit a relatively high pressure, say about 5000 lbs. to

the square inch. The valvular devices of this type as heretofore constructed have contained a multitude of tortuous passageways, valves and other parts both movable and stationary which have not only necessitated a high cost of construction, but have necessitated the use of cumbersome casings and expensive packing joints in order to in sure a non-leaking condition under the high pressures usual in devices of this character.

Accordingly, one of the objects of this invention is to provide an automatic high and low pressure control valve which. will be of simplified construction, in which the usual tortuous passageways have been el1m1- nated and replaced by straight bores and at the same time the device as a whole is constructed so that necessarily removable parts are designed and assembled to attain a highly efiicient valve of the class described but formed of relatively few parts and with the least possible use of material.

A further object of the invention is to provide a construction 7 including a valve containing casing arranged with the least possible number of openings thereto to minimize the possibility of leakage and arranged so that the several demountable elements maybe readily removed for cleaning or repairing.

Various other objects and advantages of the invention will be in part obvious from an inspection of the accompanying drawings and in part will be more fully set forth in the following particular description of one form of mechanism embodying my invention, and the invention also consists in certain new and novel features of construction and combination of parts hereinafter set forth and claimed.

In the drawingsthe figure is a longitudinal sectional view through a preferred form oi my invention particularly adapted for extreme high pressure.

There is shown a hollow casing 1 in the form of a rectangular block the several parts oi' which will be hereinafter referred to as shown in the drawing for the purpose of facilitating the location of the parts in the following description. The block is provided' with a vertically extending bore 2 the upper end of which is enlarged and internally screw threaded as shown at 3. An inserthas its lower end threaded into this enlarged portion and acts as a removable closure for the upper end of the bore. The insert includes a sleeve 5, the lower portion of which is externally threaded to engage the thread 3 and which projects beyond the top or the casing 1. The sleeve is provided wlth a bore 6, the lower portion oi which is smooth and constitutes abearing for an ens larged cylindrical plunger 7 constituting part of a change pressure valve. The upper portioncf the valve is provided with a reduced stem .8 which is guided in a bore 9, in a sleeve 10 which is threaded into the upper end of the bore 6 and held in adjacent action on the valve of the fluid through the high pressure inlet, and greater than the val e unseating pressure of the normal pressure through the-10w pressure inlet but having less tension than the combined pressures from the high and-low pressure inlets-When supplemented. by a any reactory pressure through the machine supply port.

A gland packing p is disposed:betweeintlie a casing 1, the shell 5 and the plunger 7. The

lower end of the plunger lSTGdUCGClntO115011111 surefiuid supply and the opposite opening 17' constituting the machine supply port which is similarly tapped and adapted to be connected to a hydraulic press or other ma chinecontrolled by this valve. The casing,

is bored transversely of the length-of the bore 2 and coasts therewith to provide'a low pressure passageway 18 directly connecting the inlet-16' with the port 17. i

A demountable valve seat 19' of a size to be inserted through-the bore when the insert 5 isdemounted, is removably' mounted in threaded engagementwith the lower portion of the bore 2 adjacent'thelpassageway .18.

The seat is provided with a centrally disposed and reduced passageway 20,the :upper end of which as countersunk to form at frustosconical seat. for the friisto-conical end 15"of the changcvalve. Theup per end of the seat projecting into thepassagewayls is materially enlarged to provide a massive head 21 the. lower portion of which is defined by an inclinedperipheral shoulder 22 designed, .when the seat is screwed-firmlyin place, to rest onthe countersunk.portion 23 of the .bore2. The head ,of the valve. seat a is provided with .wrenchho1es2-1 by means of which the seat: maybe screwed into ad justableip ositionlr The portion'of the bore below the valve seat. opens through a side port 25uand' constitutes. anvinletx for the high pressure supply.- The lower end of the bore 2 is closed by means of a deinountableinsert 26 screwed into the same Thisilnsertxnn eludes a sleeveQZ threaded into theenlarged lower-send of. the .bore and contains-a screw valve. 28 .pr ovided with a conical head 29 ien- 'a 'in xin athelOwenend.of the assa 'ewa r b b b 20 in. the seat to regulate the high pressure flowdnto the passageway 18 when the, valve change head 15 is unseatedz- The lower end of th'eivalve 2S prO ectsbeyOnd the outlines of the easing and the sleeve 27; and is provided: with a square head 30by means-of which the valve may be engaged by a suitable tool so as to move the head 29 to and 7 from its position engaging the lower end of the-valve seat 19;

In operation, it will be understood that the low--pressure is admitted to the device and controlled'by any suitable means such as a hand valve in the low pressure supply pipe-land thefiaidunder low pressure will move along the passageway 18 and across thexvalve extension 14 practically without interruption and directly to the machine throughthe port 175 This flow will continue until the actuation of the machine causes a reactory pressure therefrom to act on the large surface provided by the head of the plunger 7. This increase of pressure acting on the large area of the plunger will cause thevalve 15 eventually to unseat thus opening the high pressure inlet to the machine part."

Should itbe desired to control the high pressure fluid duringthe actuation of the machine while under the high pressure, the valve '28 can be ad usted to or from its seat,

[or the valve may be even closed on to the seat when it isdesired to; intercept the high pressure flow to them achl'ne.

On releasing the pressure in the passage way,'the spring willfreassert itself and act on the changevalve automatically to shut off thelnglrpressure fluid through the valve seat. Tlns'will leave the device merely in I position with the low pressure actingon the machine and thisllo'w pressure may be controlled by any approved means distinct from the deviceherein disclosed.-

By' means of a device of this character it is possibleto form the change valvular mechanisnnof a simple block or cylinder drilled transverselyto provide the low pressure passageway to the machine supply port and drilled, vand 'countersdrilled longitudinally to provide for the housinglof the inserts at opposite ends of the block or cylinder. This'formof construction necessitates merely straight line drilling and the use of ordinary threading. machines to threadthe; drilled boresiso that this device may belconstructedvwithout the necessity of expensive castings ;or special 1 machines.

The parts mostly-subjected to wear are the valve. seats-and coacting -.ValveS, but in the device disclosed ttheseparts :may be made readily replaceable so that when worn,

others be, substituted and this substitu tion maybe provided inerelyiby unscrewing the ansert: and positioning-v the valve seat in position through one of the openings. so providedi It is obvious that the tension on the spring may be readily: adjusted from the outside of the casing merely by rotating the projecting portionoftheadjustingsleevein one or the other directionaccording as the tension is desired to be increased or decreased. The valve seat may be adjusted in position towa-rd and from either of the valves engaged thereby.

As there are but four openings in the solid easing it is obvious that the possibility of leakage has been reduced to a minimum.

While I have shown and described, and have pointed out in the annexed claims, certain novel features of my invention, it will be understood that various omissions, substitutions and changes in the form and details of the device illustrated and in its opera tion may be made by those skilled in the art without departing from the spirit of the invention.

Having thus described my invention, I hereby claim:

1. A valvular device including a hollow casing having a straight bore extending therethrough from end to end, an insert threaded into one end of said bore, said insert including a sleeve provided with a bore constituting a plunger bearing, a change pressure valve including a plunger slidably mounted in said bearing, a spring-tensionadjusting member threaded into the sleeve bore, a coiled spring housed within the sleeve bore and bearing on said last named member and on said plunger, the inner end of said plunger being reduced to form a valve head, said casing provided with a pair of openings extending through the side thereof and opening into the casing bore at said valve head to provide a low pressure passageway connecting said openings, one of said openings constituting a low pressure inlet and the other opening constituting a machine supply port, a valve seat removably mounted in engagement with said casing bore, facing said low pressure passageway and provided with a high pressure passageway extending therethrough, said high pressure passageway normally closed by said spring pressed valve head, said casing provided with a side port opening to the casing bore to the outside of said valve seat and constituting a high pressure inlet and an insert for closing the end of the casing bore to the outside of said side port.

2. A. valvular device including a hollow casing having a straight bore extending therethrough from end to end, an insert threaded intoone end of said bore, said insert including a sleeve provided with a bore constituting a plunger bearing, a change pressure valve including a plunger member mounted in said bearlng, a spring-tensiorn inlet and the other opening constituting a machine supply port, a valve seat removably mounted in engagement with said casing bore, facing said low pressure passage way and provided with a high pressure passageway extending therethrough, said high pressure passageway normally closed by said spring pressed valve head, said casing provided with side port opening to the casing bore to the outside of said valve seat and constituting a high pressure inlet, an insert for closing the end of the casing bore to the outside of said side port, said last named insert provided with a valve for regulating the high pressure flow from said side port through said high pressure passageway in the valve seat when said spring pressed valve is ofl its seat.

Signed at Chicago in the county of Cook and State of Illinois this eighteenth day of January A. D. 1917.

HARVEY SLATER,

Witnesses:

M. MERKLENBURN,

F. A. Rona.

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