US1594177A - Combined throttle and trip valve - Google Patents

Description

July 27, 1926,

1,594,177 P. W. KNAUF COMBINED THROTTLE ANDTRIP VALVE Filed August 17, 1922 2 Sheets$heat 1 15 O 2? Pa 1/ 1 INVENTUR ATT NEY v July 27 ,1926.

P. W. KNAU F COMBINED-THROTTLE AND TRIP VALVE Filed August 17, 1922 2 Sheets-Sheet 2 ATTORNEY I such means in which the valve may be Patented July 27, 1926.

UNITED STATES PAUL w. m ner, or crmwrn, rmmsrnvsnm, assrenon 'ro scntr'rrn AND xonn'r- PATENT OFFICE.

ING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, CORPORATION OF PENN- sYLvAnm.

connmnn 'rnno'r'irnn Ann rmr VALVE.-

Application filed August 17, 1922. Serial 110. 582,892.

My invention relates to improvements in throttle and trip valves of the character which are adapted to be employed in connection with turbine and other engines for the purpose of cutting off the supply of steam through the steam supply pipe in case of an emergency of some kind. The presence of--steam overload may occasion-the tripping or release of the trip device of the structure fo -permitting closing of the valve to shut off the steam supply.

The general object of the invention is to provide a-novel construction of valve operating means of a character requiring a minimum amount of space; and a further object is to provide a novel construction of opened and closed without the rotation of any portion of the valve structure within the valve casing. A further object of the invention is to provide a novel means for operating the valve and other parts of the structure in from the structure do not fall upon or con-,

which an'operating screw spindle and the means for operating the latter are located laterallyof the valve structure in such posi-' tion that the drippings of water or the like tact with the said spindle.

I have made no attempt to point out at this time all of the objects and advantages incident to my invention but other objects and advantages thereof will be pointed out in the detailed description thereof which follows or will be apparent from such description.

In order that the invention may be readily understood and its practical advantages fully appreciated reference may be had to the accompanying drawings in which are illustrated certain forms of mechanical embodiments thereof. However, it will be understood that the invention is susceptible of embodiment in other forms of construction than those shown and that changes in the details of construction may be made within the scope of the claims without departing from the said invention.

In the drawings Fig. 1 is a vertical sectional view of a combined throttle and trip valve structure embodying my invention, the valve being shown in closed position;

Fig. 2 is a view in side elevation of a portion of the structure looking toward the left in Fig. 1;

Fig. 3 is a transversesectional view taken.

on the .line 3-3 of Fig. 1;

Fig. 4 is a transverse sectional view'taken on the line 4-4 of Fig. 1;

Fig. 5 is a vertical sectional view of a combined throttle and trip valve showing a modified construction of my invention embodied in a structure in which the valve operating mechanism is situated above the valve casing and not below the same as in Fig. 1 and in which the valve is shown plate 2 extending in a'general diagonal direction across the same and provided with a'horizontal portion having an opening therethrough surrounded bya valve seat 3. The said opening is adapted to be opened and closed by a valve 4. Depending from the valve 4 is a hollow stem or spool 5 having openings 6 and 7 therein through which steam is adapted to pass from the intake to the outlet side of the valve cas: i ng when the pilot valve, which will be hereinafter described, is open. These stems terminate in enlarged head-like portions 7 which are situated within guiding and holding means of a character which will be hereinafter described. The valve 4 is also provided with an upwardly projecting or extendin hollow flared projection 10, the'upper en of which is guided in a cylinder 11 which depends from the cover plate 12 of the valve casing which is adapted to close an opening therein, as shown.

For the purpose of regulating and controlling the entry of steam from the intake side of the valve casing to the space within the cylinder 11 above the valve I have provided openings 15, two of which are shown but which number may be in-- creased if desired, or, if preferred, only one passage of steam through these openings or passageways is adapted to be controlled by means of adjustable pins 16 of known construction and operation. If desired, one or more small openings 17 for the passage of steam into the space above the valve may be provided in the upwardly flared hollow portion 10.

Referring now to Figs. 1 to 4 inclusive 2O designates a hollow cylindrical projection extending upwardly from the lower side of the valve casing 1 which guides and holds the lower enlarged end portion 7 of the stem 5. It will be seen that the cylindrical holding and guiding means 11 and 20 operate to hold and guide the valve 4 in proper relation to the valve seat 3.

The valve 4 is provided with a central opening therethrough surrounded by a valve seat 21 with which a pilot valve 22 is adapted to co-operate to open and close the same. The said pilot Valve is secured to the upper end of a valve actuating rod 23. The opening movement of the pilot valve is limited by the cap 24 which is secured to lugs 25 projecting from the upper side of the valve.

A yoke is secured to and suspended from the lower side of the valve casing 1 by means of a ring 31 having a shoulder upon its inner upper edge in engagement with a similar shoulder upon the outer lower edge portion of a head 32 upon the said yoke. The ring 31 is secured to the casing 1 by means of bolts 33. The head portion 32 is provided with a central opening extending therethrough which the valve actuating rod 23 extends. The said rod is surrounded by a piston sleeve 34 the upper end of which projects through the said head, and is in communication with the chamber of the valve casing as shown in Fig. 1. The said sleeve is surrounded by a suitable packing 36 held in position by a nut 39 upon the piston sleeve 34. The piston sleeve 34 is provided with an internal shoulder 40 which is seated against a shoulder 41 upon the valve actuating rod 23. The said sleeve is held in position with the shoulders in contact with each other by a nut 42 having notches in. its lower edge which are adapted to engage with a pin 43 adapted to extend through holes in the valve actuating rod 23. By reason of such engagement the nut is prevented from accidentally becoming loose.

The lower reduced portion of the valve actuating rod extends through a bearing sleeve 48 secured within a bearing 50 at the lower end of the yoke 30.

The lower end of the valve actuating rod is provided with a collar which is held in position by a nut 56. The said collar is provided with a bearing sleeve 57 in which a pivot pin 58'is situated. Uponthis pin two armed lever 60 is pivotally mounted intermediate its ends. The right hand end of said lever, having reference to Fig. 1 of the drawings, is pivotally secured to the lower end of a swinging link 61 pivotally connected at its upper end to a pivot 62 upon the outer swinging end of a two armed link 63 pivoted at its opposite end upon a stationary pivot 64 upon a projection 65 from the lower end portion of one side of the yoke 30. k

The opposite or left hand end of the lever 60 is pivotally connected to the opposite sides of a nut 67 having screw threaded adjustable connection with a spindle 70 which has rotatable and pivotal connection with a bracket 71 extending laterally from the left hand sideof the yoke 30. The spindle is provided upon its lower end with a handle 72 by means of which it may be rotated to effect adjustable movement of the nut 67 and pivotal movement of the lever 60.

The swinging link 61 is provided at its upper end with an inwardly extending projection or shoulder 75 which is adapted to engage a shoulder or catch 76 upon thedepending arm of a bell crank lever 77 which is pivoted at 78 upon the bracket arms 7 9 intermediate their ends. The outwardly and substantially horizontally extending arm of the bell crank lever 77 is situated in co-operative relation to a tripping member 80 rigidly secured to a pivot bolt 81 upon the bracket arms 79. When the engine is inoperation or when the link-63 has been reset so that the shoulder 76 of the bell crank lever 77 is in engagement with the projection or shoulder 75 so as to support the parts in the position shown in Fig. 1 of the drawings the left hand portion of the tripping member 80 occupies a position overlying the end portion of the outwardly extending arm of the bell crank lever 77 and is held in such position by means of a trip rod 82 which is adapted to be released in known manner, as, for instance, in such manner as is disclosed in United States Letters Patent, No. 1,031,294. Upon release of the trip rod 82 the tripping member 80 is actuated by the coiled springs 83 which are supported upon rods 84 which in turn are supported upon a bar 85 secured to the outer ends of the bracket arms 79. These rods extend downwardly through openings in the outer right hand end portion of the tripping member 80. The lower ends of the springs 83 bear upon washers which are held in place by nuts 86 upon the lower ends of the said rods while the upper ends of the said springs bear or press against the lower side of the outer end portion of the tripping member 80. Upon release of the trip rod 82 the springs 83 expand and cause pivotal V movement of the tripping member 80 toward the left or in -anti-clockwise direction.

B reason of the contact of the left hand sideof said tripping member 80 with the u per side of the outwardly extending arm the bell crank lever 79 the latter is turned about its pivot inelockwise directionto release the catch shoulder'7 6 from the projection or shoulder 75.

If it now be assumed that the valye is in 0 en position instead of closed position as s own in Fig. 1 the said valve is free to close. Such closure is effected by the weight of the valve itself plus the force exerted to effect closure by the steam upon the valve actuating rod and upon the upper end of the piston sleeve 34.

In Fig. 1 the valve operating mechanism is indicated by dotted lines in the position it occupies immediately after the valve is moved from open into closed position and before the adjustment of any of the parts. When the valve is in open position and the catch shoulder 76 is released from the projection or shoulder 75, the arm 63, link 61 and the lever descend into the positions indicated in dotted lines and the spindle moves toward the right as shown 1n dotted,

lines. The nut 67 remains in its uppermost position shown in dotted lines. In order to open the valve the first step is to turn the spindle in 'a direction to cause descending movement of the nut 67 into the position shown in full lines of Fig. 1 which causes pivotal movement of the lever 60 upon the pivot 58 so as to lift the right hand end of the said lever and effect upward movement of the link 61 and of the right hand'end portion of the arm 63 upwardly to eil'ect engagement of the projection or shoulder with the catch shoulder 76. Neither the pilot valve nor the main valve is efi'ected by this 0 eration. Thereafter the spindle 70 is turned in the opposite direction to efiect upward movement of the lever 60 about its pivotal connection with the lower end of the link 61. The first action is to lift the pilot valve 22 from its seat so as to permit the steam to flow from the space above the upper side of the valve 4 and within the cylinder 11 into the outlet side of the valve casing to thereby release and reduce the pressure of the steam above the valve and lessen the amount of force to be overcome in the further upward movement of the valve actuating rod to lift the main valve into open position.

Referring now to the construction shown in Figs. 5 and 6 of the drawing it will be noted that, as already stated, the valve actuating mechanism is situated above the valve casing. v

In this construction the lower head-like end portion 7 of the valve stem or spool 5 is guided in and by the hollow cylinder which projects upwardly from aplate 96 for closing or covering an opening 97 in the lower side of the valve casing. The valve 4 in this structure is provided with a central opening surrounded by a valve seat 98 with which. is adapted to co-operate a pilot valve 99 which is secured to a valve actuating rod preferably consisting of two parts 100 and 101 which parts are connected together by a sleeve 102 tapped at its opposite ends, as indicated, for engagement with the adjacent upper and lower ends of the parts 100 and 101.

The upward movement of the pilot valve 99 with respect to the valve 4 is limited by a plate 103 which is secured to lugs 104 which project upwardly from the valve 4.

In Fig. 5 both the pilot and the main valves are shown in open position.

It will be noted that the lower end of the part 100 of the valve actuating rod extends entirely through the valve casing and that such lower end projects through a' central opening 105 in the cover plate 96. Packing 106 is provided within the annular space between the outer and lower end portion of the part 100 and a hollow boss or projection 10? extending outwardly from the cover 96.

The said packing is held in position by a washer ring 108 which in turn is held in place bythe elongated cap 109 which has vent openings 109 adjacent. its lower end.

. Supporting posts or standards 110 pro- -ject' upwardly from the cover plate 12 andterminate in an annular head-like portion 111 to which the lower flanged end 112 of a cas-- ing 113 is connected. The lower end of said casing is closed by means of a relatively thickplate 115, the outer peripheral edge portion of which is held between the annular head-like portion 111 and the lower end of the casing 113. The plate 115 is provided with a central opening which is concentric with an upwardly projecting integral hollow cylinder 117. The said plate is also provided with a short flange-like projection upon its lower side concentric with the said opening within which packing 117 is situated and held by means of a gland memberrounded by a suitable packing 120 within the flange 120, which packing is held in place by a gland member 120 which in turn is secured and held in place by means of screws 120 which are in' engagement with' the flange 120*. The packing surrounds an intermediate portion of the part 101 of the valve actuating rod which extends upwardly through the said plate 115 and through the hollow cylindrical vprojection 120. The up- 'side of the valve casing.

per end of the valve actuating rod is connected as shown to the closed'top of a cylinder which projects upwardly from a plate 126 which plate is provided with a central opening through which the cylinder 117 projects and upon which said plate is guided. This plate fits more or less closely within the interior of the chamber or casing 113. The said plate is provided with small bleed holes 127, as indicated, for permitting the passage of oil from one side to'the other thereof,

The cylinder 125 is surrounded by a coiled spring 130, the lower end of which rests and bears against the upper side of the outer edge portion of the plate 126 while the upper end thereof rests and bears against the inner surface of the upper end of the casing 113. The spring 130 operating against the plate 126 exerts downward pressure upon the valve actuating rod comprising the parts 100 and 101 and thereby tends to close the valve when it is in open position and tends to hold the same in closed position when it is shut.

The presence of oil or other suitable retarding liquid within the casing 113 prevents too quick or rapid movement of the part 125 and parts connected therewith under the influence of the spring 130.

For the purpose of actuating and operating the valve actuating rod and the valves connected therewith I have provided the two armed lever 140, which has pivotal connection intermediate its ends to the cylindrical member 102 which connects the adjacent ends of the parts 100 and 101 of the said rod. The left hand end of the said lever is connected to the lower end of a swinging link 141, the upper end of which is pivotally connected with the outer left hand end of the arm 142, the opposite end of which is pivotally connected upon a stationary pivot 143 which is supported upon projections 144 upon the supporting standards 110. The outer end of the arm 142 is provided with an extension orprojection 145 which is adapted to be engaged by a catch shoulder 146 upon the inner or right hand side of the downwardly extending arm of a bell crank lever 147, the other substantially horizontal arm of which has pin and slot connection as in-' dicated at 150 with the lower end portion of the stem 151 of a piston 152 which is situated in a piston cylinder 153. The lower portion of said cylinder underneath the said piston is in communication with a pipe 154, the opposite ends only of which are shown, which has communication with the intake It will be seen, therefore, that at all times when the ap paratus is in operation the lower end of the piston cylinder 153 is in communication with a source of steam pressure. The steam passes by leakage and also through a bleed hole 155 through the piston 152 into the upper portion of the piston cylinder 153 above the piston 152. The upper portion of said piston is in communication with a pipe 158 only a portion of which is shown and which isprovided with means, not shown, for open ing and closing the same, which means is adapted to be operated in any suitable manner in case of emergency to open the said pipe to relieve the steam pressure upon-the upper or outer side of the piston 152. This mechanism is not shown because it is already well known and constitutes no part of my invention.

The piston cylinder 153 is supported upon a bracket 160 which extends laterally from the casing 113, as shown in Fig. 5.

To limit the extentof pivotal movement of the bell crank lever 147 I have provided a projecting arm 161, the upper end of which is situated within a slot or notch 162 formed by cutting out a portion of the bracket 160 and a portion of the base upon the piston Y cylinder 153 by means of which it is connected to the bracket 160. Springs 163, one only of which is shown, which have connection at their upper ends to the opposite sides of the bracket 160 and at their opposite lower ends to arms 164 secured to the outer ends of the pivot to which the bell crank lever 147 is secured tends to hold the latter in position to allowthe catch shoulder 146 to be engaged by the extension or projection 145 at the outer end of the arm 142.

The right hand end of the lever 140 is pivotally connected to the opposite sides of a nut, 165 which has adjustable screw threaded engagement with the lower end portion of a spindle 166, the upper end of which is reduced and is provided with a collar whichprojects into the lower end of a sleeve which is pivotally supported upon the outer ends of bracket-like arms 171 which project laterally from the casing 113 near its upper end. The upper end portion of the spindle 166 projects beyond the upper end of the said sleeve and is provided with a beveled gear 172 which is secured thereto by means of a nut 173. Interposed between the underside of the said gear and the upper end of the sleeve 170 is a ball bearing 174 provided for the pur-,

pose of facilitating the rotation of the said gear and the said spindle with respect to the said sleeve. The spindle 166 and beveled gear 172 are rigidly connected so as to rotate together. The said sleeve is provided with a laterally projecting stud 175 upon which is rotatably mounted a beveled gear 176 having an outwardly extended sleeve-like portion 177 upon which is mounted a hand wheel 178, The hub 179 of the saidhand wheel is provided with an opening through which the sleeve-like projection 177 extends and the two are connected to rotate together by means of a key 180. The gear 176 and the o crating handle are retained upon the stud s aft 175 by means of a washer 181 and nut 182. The handle 178 may be turned in either direction to cause corresponding rotation of the spindle 166. Such rotation effects adjustment of the nut 165 in one direction or the other upon the spindle 166 depending upon the direction of rotation of the latter.

It will be noted that the spindle 166 and the means for o crating the same are located laterally'o the structure which-is a desirable arrangement in order that the said spindle and its operating mechanism may be kept free from' water, 011 and the like.

In the construction, as illustrated in Fig. 5, the valve is shown in open position, being held in such position by reason of the engagement of the catch shoulder 146 with the projection or extension 145 at the outer end of the arm 142. If the said catch 146 should be released from the projection 145 by operation of the bell crank lever hereinbefore described the valve would tend to seat itself under the influence of gravity; but owing to the fact that the valve .actuating rod passes through two stuffing boxes wherein it is closely engaged by packing material the weight of the said valve mechanism probably would not be suflicient to efi'ect closure thereof. It is desirable, therefore, that supplemental means should be provided for effecting closure thereof. Such means consists of the coiled spring 130 heretofore referred to. In order to prevent too rapid closing movement of the valve the bleed holes 127 through the flange 126 are provided of a size to control the passage of a suitable retarding liquid, such as oil, from underneath the said flange 126 to the upperside thereof. By this means the speed of closing movement of the valve may be controlled upon release of the tripping mechanism. Owing to the fact that the valve actuating rod extends entirely through the valve casing the steam in *the latter exerts no closing pressure upon the valve. 7

Upon release of said tripping mechanism the valve and the valve operating mechanism assumes the position indicated in dotted lines in Fig. 5. Immediately following the closing position the nut 165 occupies the position shown in full lines in Fig. 5.

In the operation of opening the valve the first step is to operate the spindle 166 to cause downward movement of the nut 165 thereby causing pivotal movement of the the catch shoulder 146. Thereafter rotation of the spindle 166 in the opposite" di- 165 from the position shown in dotted lines in Fig. 5 to the position shown in full lines causing pivotal movement of the lever 140 about its pivot at the lower end of the link 141 to thereby efiect,first upward movement of the pilot valve to permit steam to flow from the upper side of the valve 4 to the lowerside thereof and to thereafter lift the main valve 4 into open position, as shown in Fig. 5.

It will be seen that'in both forms of construction I have provided a valve operating mechanism in which the rotatable spindles for effecting operation of the said mechanism are located laterally of the structure and also that I have provided a struc ture of a character such that it may occupy a minimum of space.

Having thus described my invention what I claim and desire to secure by Letters Patent is r 1. In a combined throttle and trip valve,

the combination of a valve casing, a valvev operating therein, a valve actuating rod, levers one of which is connected intermediate its ends with the said rod, a link connection between adjacent ends of said levers,

and means located laterally of the axis of ing rod having connection with said valve and projecting from said casing, a lever having pivotal connection intermediate its ends with the said valve actuating rod, an arm having connection at one end with a stationary-pivot situated a distance to one side of the said valve actuating rod and the said arm extending transversely of and beyond the said valve actuating rod, a link having pivotal connection at one end with the outer swinging end of said arm and at lts other end with the adjacent end of the sa1d lever, and means having adjustable connection with the opposite end of said lever for actuating the same.

3. In a combined throttle and trip valve, the combination of a valve casing, a valve situated within said casing, a valve actuatmg rod having connection. with said valve and, projecting from said casing, a lever having ends wit the said valve actuating rod, an arm having connection at one end with a stationary pivot situated a distance to one side of the said valve actuating rod. and the said arm extending transversely and beyond the said valve actuating rod, a. link having pivotal connection with the outer swinging end of said arm and with the adjacent end of the said lever, and a rotatable spindle having adjustable connection with the opposite end of said lever, the said spindle being located a distance laterally of the said valve actuating rod and of the said valve.

4. In a combined throttle and trip valve, the combinationof a valve casing, a valve situated within said casing and adapted to control an opening therethrough, a valve actuating rod having connection with the said valve and projecting from the said valve casing, a lever having pivotal con nection intermediate its ends with the said valve actuating rod, a supporting yoke structure projecting from the said valve casing, an arm pivoted upon a stationary pivot upon the said yoke structure a distance laterally of the said valve actuating rod. which arm extends transversely of and a distance beyond the said rod, a link having connection at one end with the swinging end of said arm and at its opposite end with the adjacent end of the said pivoted lever, a spindle rotatably and pivotally supported a distance from and laterally of the said valve actuating rod, which spindle is screw threaded, and means for connecting the opposite end of the said lever with the said spindle, which means has screw threaded connection with said spindle.

5. In a combined throttle and trip valve, means for operating the said valve which means comprises in combination a valve actuating rod, a lever pivoted intermediate its ends to the said rod, an arm pivoted at one end upon a stationary pivot, the said arm extending transversely of and beyond the said valve actuating rod, a link having con nection at its upper end with the swinging end of said arm and at its lower end with the adjacent end of said pivoted lever, a tripping device adapted to operatively engage the said arm for retaining the same in elevated position, the said device being adapted to be tripped to release the said arm to permit descending movement thereof, and means having operative connection with the opposite end of the said lever for operating the same to return the said arminto engagement with the said tripping device and for actuating the said valve .ac-'

tuating rod to open the valve.

6. In a combined throttle and trip valve, means for operating thesaid valve, said means comprising a valve actuating rod, a lever having pivotal connection intermediate its ends with the said rod, an arm having connection at one end with a stationary pivot, said arm bein adapted to swing about the axis of said plvot, a link having pivotal connection at one end with the outer swinging end of said arm, said link being provided with a projection adjacent the said pivoted end, the opposite end of said link 7. In a combined throttle and trip valve,

the combination of a valve casing, a valve situated within said casing and adapted to open and close an opening therethrough, a valve actuating rod'projecting from the said casing, a lever having pivotal connection intermediate its ends with the said valve actuating rod exteriorly of the said casing, an arm pivotally supported at one end upon a stationary pivot which arm extends transversely of and beyond the said valve actuating rod, a link having pivotal connection at one end with the outer swinging end of said arm and at its opposite end with the adjacent end of said lever, a rotatable spindle situated a distance from and. laterally of the said valve actuating rod, means for adjustably connecting the opposite end of said lever with the said spindle, a tripping device adapted to have operative engagement with the said arm for retaining the same in position to hold the valve in closed position, means for tripping the said tripping device to release the said arm, and means for exerting 'pressure upon the said valve actuating rod to effect closure of the said valve.

8. In a combined throttle and trip valve, the combination of a valve casing, a valve situated within said casing and adapted to open andi close an opening therethrough, a valve actuating rod projecting from the said casing, a lever having pivotal connection in termediate its ends with the said valve actuating rod exteriorly of. the said casing, an arm pivotally supported at one end upon a stationary pivot which arm extends transversely of and beyond the said valve actuating rod, a link having pivotal connection at one end with the outer swinging end of said arm and at its opposite end with the adjacent end of said lever, a rotatable spindle situated a distance from and laterally of the said valve actuating rod, means for adjustably connecting the opposite ends of said lever with the said spindle, a tripping device adapted to have operative engagement with the said arm for retaining the same in position to hold the valve in closed position, means for tripping the said tripping device to release the said arm, and a spring operating upon the said valve actuating rod 9. The combination with a self-closing valve, of an operating rod connected therewith, a lever pivotally connected with the valve operating rod, a releasable support for the lever, said lever being pivotally connected therewith, an adjustably movable support for the lever, said lever being pivotally connected therewith, an operating screw for moving the adjustable support, and means for rotating said operating screw.

10. The combination with a valve which is biased toward closed position, of an operating lever connected to the valve, a fulcrum for the lever, manually operated means for moving the lever on its fulcrum to 0 en and close the valve, a support for the ulcrum, and means for releasing the support to permit the valve to close independently of the manually operated means.

11. The combination with a 'valve which is biased toward closed position, of an operating lever connected to the valve, a fulcrum for the lever, a threaded sleeve connected to the lever, a manually operated member which has a threaded part engaging the.

threads on said sleeve and which when turned movesthe lever on its fulcrum to open and close the valve, a supporting means for said fulcrum, and means for releasing the supporting means to permit the "alve to close independently of the manually operated member.

In testimony that I claim the foregoing as my invention I have hereunto signed my name this 14th day of August, A. D., 1922.

PAUL W. KNAUF.

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