US1455940A - Combined stop and safety valve - Google Patents

Description

May 22, '1923.- 1,455,940

- v M. w. vsryQMs COMBINED strop AND SAFETY VALVE ARR l u 'ATTO/MEV i Patented May 22,1923;

UNITED s'rATEsPATi-:NT OFFICE.'-

` :MARION w. sroiirs,l or KANSAS CITY, MISSOURI.

COMBINED STOP AND SAFETY VALVE.

Application. led August 29', 1921. Serial. No.' 496,299.

To allwhomtmayconcem:

Be it known that I, MAmoN W. S'rolus, a citizen of the United States, residing at Kansas City, in the county lof Jackson and .6 State of Missouri, have invented certain new and useful Improvements in Combined Stopsand Safety .-Valves; and I do declare v the followingl tobe a full, clear, and exact description of the invention, such as will 104 enable others skilled in the art to which it appertains to make and use .the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. v 1

This invention relates to a combined stop and safet valve particularly designed to be used on t e discharge line of a compressor ump, such as is used .to lmaintain the rerigerant of a refrigeratingv system in circulation.

One ofthe objects is to eliminate the danfri ratin lgiie the l Fig. 2 1s a vertlcal sectionalview of the valve mechanism constituting my invention,

ger caused by operators starting up the comressors with the discharge stop valve closed. v ith the ordinary construction of stop valve 4it not infrequently happens that the compressor started up with the valve closed. will -result in the compressor or connections bursting, due to the excess pressure produced.

Hitherto it has sometimes been the pract1ce to attach an. auxiliary relief valve in addition to the hand operated stop valve on the compressor discharge' line but. this is notalways possible due to lack of room and even where the auxiliary relief valves are used, they discharge into atmosphere or into the compressor suction line and'in actual vpractice these valves invariably leak after 4 gland 12, held in p ace and adjuste aving once relieved. Therefore, if therelief valve discharges intoatmosphere, there will be a continuousloss of ammoniawhere as if it dischar es into the suction line the and Fig. 3 is a sectional view through the sprin casing on the line 3-3 of Fig. 2.

Re erring now to the merals of-reference:`

1 designates an air compressor, 2 the discharge line and 3 the suction line for-the compressor. Located in the discharge line is a combined stop and safety valve mechanism constituting the subject matter of my invention. The valve casing 4 is shown as of the ordinary ammonia globe valve type rawings by nuwith an inlet on the pressure side 5 and an outlet on the discharge side 6.' v i The valve seat 7 is providedwith an opening -8 adapted to be closed by a disc valve 9, provided with a threadedvalve stem 10, on the outer end of which is a hand wheel 11 for manually controlling the valve so as to seat and unseat the valve to open and close the opening 8. The stem 10 is rovided with a tpacking by the nut 13 so as to maintain the proper tension on the packing 14 therein so as to prevent compressor wil be compelled` to per orm` 45 uselesss' work,'depending onhow badly the relief valve leaks.l g The combined stop and safety valve formlng the subject matter of my invention .is especially desi 50 compressor an `the condenser and the parts are soI arranged that the relief valve will automaticall open' to relieve any undue pressure in t e compressor, should the comed to be located between the e leakage around the stem 10. The stem is alsoprovided with a back seat 15 for engaging the rounded edge A16 of vthe gland4 17 to enable the operator to re-pack the valve stem while the discharge line is open and full of ammonia.

The tubular portion 4 of the valve casing lLis provided with a shoulder 18 to hold the spring casing 1-9 in place and limit its downward movement, the projection .18 and the' spring casing 19 being so machined that` the jam nut 29. rl`he v that the smooth portion their top ends form the female recess 20 for retaining a gasket 21 and receiving the male projection 22 of the .gland 17, which screws into the art 4', thus forming a gastight joint. The gland 17 maybe bolted to the projection or casing 4 if desired, although ll prefer to have a threaded connection as shown.

, The spring casing 19 is provided with a key-way 23, in which is a spline or key 24,

engaging a recess or groove 25 in the fol- 'lower 26, slidable within the casing and having screw threaded connectionwith the stem 10, through the threaded portion 27. The casing 19 carries an adjusting nut 28, surrounding the valve stern 10 and, having threaded connection with said casing, the adjusting nut being held in fixed position by follower 26 rests against the shoulder 30 of the casing 19 and is held in-position by the spring 31, one vend of which bears against the shoulder 30 and vthe other against the spring tensioning and adjusting nut 28 so that the tension of the spring can be'- controlled.

lt will be apparent by reference to Fig. 2 32 of the stem 10 has free sliding movement through the adj justing nut 28 and the locking nut 29.

rlhe threaded connection between the stem 10 and the follower 26 permi l a handvadjustment of the valve disc 9 through the medium of the hand wheel 11 to provide a safety or relief but due to the fact that the stem 10 is unable to slip through the follower 26, which is held in position by the spring 31, any undue pressure under the valve disc 9 when it is seated will compress the spring 31, allowing the follower 26 and the valve disc 9 to lift and when the-pressure has been sufiiciently relieved, the spring 31 will push the follower 26 back into place, causing the valve disc 9 to return to its seat 7.

The follower 26 is prevented from turning in t e casing by the key 24; thus securing a pos tive movement of the valve when the handle 11 is operated.

rlhe threads on the stem 10 which engage the follower 26 are limited so that it will be impossible for the operator to unduly compressthe spring 31 by thou htlessly turning the handle 11 beyond the c osed position of the valve. i

The valve disc 9 is fastened to the stem by being inserted into the socket 33 and secured e transverse pin 34 so that the valve 9 will have a slightly wobbling movement to permit it to readily seat upon the seat 7. Any loo/se connection, however, may be provided so as .to provide a self-seating valve. -llt willjbe noticed that the spring casing19 is'made self-contained so far as the spring adjustment is concerned, thus permittin the operator to dismantle this valve an reintacto assemble it with positive assurance that he has the proper tension on the safety spring.

When the parts are in the position shown in Fig. 2 and the compressor is to be operated ordinarily. the operator will turn the handle 11 so as to turn the stem 10. The threaded connection 27 will cause the stem to rise if the handle 11 is turned in one direction, unseating the valve 9 so that the discharged ammonia or other fluid may pass through 5, through the port 8 and out through 6. When it is desired to close olf the valve, this can be accomplished by turning the handle 11 in an opposite direction, as will be vclearly apparent by reference to lFig. 2.

lf the valve is seated, as shown in Fig. 2 l

and the compressor is inadvertently started up, as soon as pressure 1s generated on the inlet. side of the casing 4, it will act against the bottom of the disc valve 9, raising the disc valve 9, the stem 10 and the follower 26 against 'the action of the spring 31 provided,

The valve is so constructed that it will noty take up any more room, than an ordinary stop valvewhile it produces the dual function of a safety valve and a stop valve.

lf desired, by-pass pipes 35 and 36 may be connected respectively to the intake side of the valve 4 and the intake side ofthe valve 37 in the line 3 andv the outlet side of the valve 4 and the outlet side of the valve 37.' inthe line 3. (Ordinarily according to 1n invention, however, these by-pass pipes wi l be eliminated but where they are used l prefer to include the valves 38 and 39.

.From the foregoin it will be apparent that the valve mechanism efficiently provides for an ordinary stop valvegas well as a safety or relief valve which becomes eEecti-ve only upon abnormal pressure or abnormal operating conditions of the compressor.

' llt frequently happens with the ordinary stop valve that the compressor is started 'up with the valve closed and unless a relief valve is provided at some convenient point as, for example,

it may circulate and after' 7 ters-Patent is: v l

1. A combined'stop and" safety'valve for` pressor must shut down until the valve lis reacked because such valves almost invariably leak after they have once functioned.

Such disadvantages are not present with my' invention. 'p

What I claim and desiredto secure by Letcompressors comprislng a valve casing, a reciprocatory follower carried by the casing,4

a threaded valve stem in the follower having a valvefor normally closing an. opening in the seat of the valve casing, a spring for normally exerting pressure against the follower to maintain the valve sea-ted, said spring permitting movement of the follower to allow the valve to unseat upon the accumulation of abnormal pressure in the valve casing sufficient lto preponderate over the spring, and a casing within the valve casing splined to the follower whereby the follower may have reciprocatory movement.- but be held against rotative movement.

2. A combined stop and safety valve for compressors comprising a valve casing having a valve seat provided with an o ening,

i a tubular portion carried by thel va ve casing, a tubular sprin cage in the t-ubular portion, a tubular fo lower splined thereto, a valve stem threaded inthe follower, .a

valve thereon for normally closing the opening in the valve'seat, the vfollower having movement away from the valve seat, a spring tenslonmg means 1n the spring cage,

and a spring surrounding the valve stem,

one end of which bears against the tensioning means and the other against the end of the follower. 3. A combined lstop and safety valve coming the valve stem,

nection with the follower, a handle forturning the-stem in the follower, a valve on the stem for closin the opening in the valve vspring cage, a valve stem in threaded conseat, an adjusta le tensioning nut in threaded engagement with of the spring cage, and a. spring surroundone end of which bea-rs the threaded portion f against the tensioning nut and the other against the follower.

4. A combined stop and safety valve .com-

'-prising a valve casing having an intermediate ltubular member at right angles thereto, a valve seat in the valve casing rovided with an opening therein, a valve or valving said opening, a stem connected to the valve, a, spring'ca e in the tubular member, afollower movab e in the spring cage and splined thereto, means on the follower vfor threaded engagement with the valve stem, a

tensioning nut in the spring cage, a springl interposed between the tensioning nut and the follower, a' gland in threaded engagement with -the tubular member and provided with an annular flange bearing against the springcage, -and an operating handle for the stem. "i

In testimony whereof ailix my signa- 7,5

ture.

MARION w. sToMs.

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