US1055995A - Valve. - Google Patents

Description

G. P. ABORN. K

VALVE.

APPLICATION FILED MAB.27, 1912.

1,055,995, y Pated Mar. 18, 1913.v

3 SHEETS-SHEET 1.

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VALVE.

APPLICATION IIED MAE. 27, w12.

mente@ Mar. is, mi2'.

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rNITED srarns Para Flili.

GEORGE P. ABORN, vOE .BIE/OOAKIAINE,v MASSACHUSETTS. SSIGNOR 'IO THE BLAKE &

' KNOWLES STEAM PUMP WORKS, A CORPORATION OF NEW JERSEY.

Specification' of Letters Patent.

Fatented Mar. 1 8, 15113.

Application lled March 27, 1912. Serial Il'o. 686,562.

' To all whom t may oonfern:

)ne object of the invention is to securel economy in steam consumption by working the steamy exl'iansively.

Another object, when the invention is used in eonneetion with pumps, is to Slow down the piston stroke near its end to allow the valves in the pump cylinder to seat quietly and with little shook, and to allow an easier reversal of the piston stroke.

Another object is to secure ay simpleriorm of mechanism to effeet these results than has hitherto been used; and a still further oh- 4ject is to reduce to a minimum the clearance spaces in the eut-ofi" ports and the expansion of steam therein. j

In the drawings, Figure. 1 is a section transverse to the steam cylinder. Fig1 2 is a sect-ion longitudinally of the 'cylinder and on the line of the valve rod, and Fig. 3 1s a plan of the valve seat on the steam cylinder showing portI connections. i

In Fig. 1, the main cylinder 1s indicated at 10, and the main piston 1s partly shown at 11 in Fig. 2. rlhe valve seat 12 of the ,main cylinder is equipped with three main ports, 13 and 14 being the in let ports and 15 the exhaust port. The main' slide valve 16 is moved by an auxiliary piston 1 7 melosed in t-he auxiliary steam cylinder 18.

-The cylinder 18 is shown positioned at right angles to the axial line of the main cylinder which it surmounts, and this is the preferred arrangement although not essentiallyl to the broader' features of the invention. f

The central portion of thevalve piston 17 is of a reduced semi-cylindrical cross-section as shown in Figs. 1 and 2, and in the space thus formed between the valve pi tton alud the main slide valve 16, the auxiliary valve -19 and the cut-olf valveQO are located. The

l l auxiliary valve controls the admission and exhaust to and from the valve piston and is moved by the cut-ott' valve within which it is loosely inclosed. The cut-ofi' valve controls the supply of steam passing through the main valve and is moved by valve rod 21, which is actuated in turn by the usual tappet arrangement, not shown.

Asbest shown in Fig. 2, the cut-ofi valve straddles the 'auxiliary valve and-the dimensions of these valves is such that there'is a certain amount of lost motion between them. Both valves have their seats uponthe upper face of the `main slide valve 1G, and their movement, in line with the valve rod 9.1, is

at right angles to the line of motion of the main slide valve 16 and the valve piston 17. The opening and closing of the ports of the auxiliary cylinder are determined by the -eon'rbined movements of theoauxiliary and the main slide valves, as will presently be described.

Referring now to Fig. 3, the seat ot the main slide valve is shown as being equipped with seven ports. These ports are the main exhaustl atv 15, the two main inlets at 13 and 14, two siu'iplementary steam supply ports and through which steam may be supplied to the main valve independently ot the cut-ofi when steam is used for the full stroke, and the two ports 24 and 25 com-l municating with the auxiliary cylinder. As

is obvious, the arrangement ot these ports is such also as to secure in the usual way the preadmissio-n of steam to prevent. shock upon the beginning of a. piston stroke in the main cylinder, the poeketing of steam at the end o the stroke for the same reason, 'and' also, by means of the related ports, to cushion the movements of the auxiliary piston 17.

. The described mechanism operates as ollows: Assuming the auxiliary piston 17, as viewed in Fig. 1, to be in its extreme righthand position., as shown, it will be held in this position by steam admitted to the lettv vof the auxiliary piston through ports 24, Q4 as shown in Figs. 1 and 2. The main valve 16 will also be in a similar position and will allow steam to pass through ports 26, 27, 13- and :29 .(Fig. 2) into the main cylinder 10, causing the piston 11 to move to the right. At the same time steaui will exhaust through port 14- (Fig. 1) to the Cavity BO in main slide valve 16 and the. (mitral loo exhaust port 15. At a predetermined point in the travel of the main piston 11, the usual tappet gear (not shown) will move the valve rod 21 to the right, as viewed in Fig'. 2. The cut-off valve 20 attached thereto will thereupon close port 26, cutting oit the supply of steam to the main piston thus causing the steam to Work expansi'vely during the remainder of the piston stroke. As the cut-ofi' valve 20 closes 'port 26, it comes into contact With projections on auxiliary valve 19, causing the latter valve to move to the right vuntil port 25 in main valve 16 is open to steam and'port 24 open to the exhaust cavity 31 in auxiliary valve 19. Steam is now exhausted from the left of the auxiliary piston-17 through t-he'channel indicated generally by 24, 24, While at the same time steam isadmitted through the opposed ports indicated at 25. This causes the auxiliary piston and main slide valve to moveto the lef-t until the port 24 in the main valve is closed to exhaust by the edge of the cavity 31in theauxiliary valve 19. The'port 24 being closed, the auxiliary piston cushions-.Ourthe steam confined between its end and the auxiliary cylinder head, and comes to rest with the main slide valve in the proper position for the return stroke of the main piston. When it is desired to have the steam follow .full stroke in the main cylinder, -as in Warming up, either one or both of thel bleeder valves 32, 32 covering ports 33, 33 may be opened. Thesevalves admit steam through portsI 22 and 23 to the main slide valve through which it may pass into the main cylinder independently of the cuto'l arrangement.

The construction vas thus shown and described is the preferred embodiment of the invention gbut it Will be understood that the invention is not limited to the specific arrangement of parts illustrated, but that the broader features ofthe invention, as defined by the claims, may be embodied in other constructions. Y

The construction shown and described herein includes certain features claimed broadly in my prior applications, Serial No.

659,501, tiled November 10th, 1911, and No.

659,968, filed November 13th, 1,911.

What is claimed is 1. In combination, a iuid actuated valve gear including an auxiliary cylinder, an auxiliary piston, a main slide valve attached to and moved by the piston, an auxiliary slide valve, a cut-off valve, the Said auxiliary slide valve and the cut-olfl valve vbeing mounted 'upon the main slide valve and nested in said piston, but having their respective movements independent of the piston.'

' 2. In combination, a fiuid actuated valve gear including an auxiliary cylinder, an auxiliary piston, a main sllde valve at tached to and moved by said piston, an auxiliary slide valve, and u cut-olf vulve, the said auxiliary slide valve and the cut-olf valve being` mounted upon the main slide valve andv located between the main slide valve and the auxiliary piston.

3. In combination, the valve seat ot' a main cylinder, the main slide valve Working upon said seat, an auxiliary cylinder, a piston located within the auxiliary cylinder, the said valve and piston being coupled together to move as a unit, the valve being moved by the piston, an auxiliary valve seated upon the main slide valve and movable thereupon in a direction at right angles to the line of movement of the main slide valve, ports in the main slide valve coperating -with the auxiliary valve, ports in the valve seat ofthe main cylinder connected with the auxiliary cylinder and cooperating with the saidports in the main slide valve and with the auxiliary valve, the arrangement being such that the said piston is primarily controlled by the movement oi' the auxiliary valve upon the main slidel valve, and is secondarily controlled by the movement of the main slide valve under the auxiliary slide valve, and a cut-oli valve seated upon the main slide valve and controlling the movement ofthe said auxiliary valve.

L1. In combination, the valve seat of a' main cylinder, the main slide valve Working upon said seat, an auxiliary cylinder, a piston located within the auxiliary cylinder and adapted to move the said slide valve,` an auxiliary valve seated upon the main slide valve and movable thereupon, passages in the auxiliary valve, in the main slide valve, and in the'valve seat of the main cylinder whereby the said piston is primarily controlled by the movementof the auxiliary valve lupon the main slide valve, and is secondarily controlled by the movement of the main slide valve under the auxiliary valve, and a cut-off valve seated upon the main slide, valve and adapted to control the movement of the auxiliary valve.

5. In combination, a main slide valve, fluid actuated means to move said valve, an auxiliary valve controlling the liuid actuated means, and a cut-oli valve controlling both the movement of the auxiliar valve and the supply of liuid to the main slide valve, the said auxiliary and cut-olf valves being located between .the fluid actuated means and the main slide valve.

6. In combina-tion, a main -slide valve, fiuidactuated means to move said valve, an auxiliary valve controlling the iuid: actuated means, a cut-olf valvey controlling the movement of the auxiliary valve and adapted to limit the-supply of iuid to the main slide valve,- the said auxiliary and cut-off valves being located between the iluid,t actuated means and the main slide valve, and means pendenily of the said cut-olf valve.

T. In combination, a cylinder, a main slide valve controllingr the irnovenientv of Huid to and fronrthe cylinder, luid actuated meansl to move the main slide valve, a cut-oli' valve controlling the passage of fluid to the main slide valve, an auxiliary valve controlling the fluid actuated-means, the said auxiliary valve being controlled by the movement of the cut-olf valve, both the auxiliary and the cut-ofi" valves being located upon the main slide valve.

8. In combination, a main cylinder, a main slide valve, an auxiliary cylinder2 an v auxiliary piston located Within the auxiliary cylinder and controlling the Amain slide valve, a cut-off valve controllin the movement of fluid to the main sli e valve, an auxiliary valve controlling the movement of fluid to the auxiliary cylinder, the said auxiliary valve being controlled by the movenient of the cut-off valve, both the auxiliary andthe cut-off valves being located between the said piston and the main slide valve.

In testimon whereof, I have hereunto set my hand, int e presence of two subscribing witnesses.

GEORGE P. ABORN.

Witnesses: j l

C. V.- STEaRys, C. G. CHAPMAN.

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