US509923A

US509923A - Regulating-valve

Info

Publication number: US509923A
Authority: US
Publication date: 1893-12-05
Anticipated expiration: 1910-12-05

Description

(No Model.) 3 Sheets-Sheet 1.

N; G. LOGKE.

' REGULATING VALVE. No. 509,923. Patented Dec. 5,1893.

(No Model.) 9 3 Sheets-Sheet 2.

N. O. LOOKE.

REGULATING VALVE. No. 509,923. Patented Dec. 5, 1893.

I i I f 3 M a a z J Z 1 momma.) 3 Sheets-Shet s. N. G. LOGKE.

REGULATI NG VALVE.

No. 509,923. Patented Dec. 5,1893.

UNITED STATES PATENT OFFICE.

NATHANIEL O. LOOKE, OF SALEM, MASSACHUSETTS.

REGULATlNG-VALVE.

SPECIFICATION forming part of Letters Patent No. 509,923, dated December 5, 1893.

Application filed February 18,1892. Serial No. 421,392. (No model.)

ToaZZ whom it may concern.-

Be it known that I, NATHANIEL CHASE LOOKE, of Salem, in the county of Essex and State of Massachusetts, have invented an Improvement in Regulating-Valves, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure l is a sectional elevation illustrating one form of apparatus with my improve ment; Fig. 2 a like elevation of asecond form of apparatus with my improvement; and Fig. 3 a like elevation of a third form of apparatus with my improvement.

In many forms of regulating valves the main valve is controlled by a motor which is supplied with steam or other fluid under pressure, through a conduit which is of such small area, or otherwise so restricted, that the pressure tending to actuate the motor can be widely varied by opening or closing an exhaust passage from the motor; and my invention consists in forming that conduit through the main valve, and reducing its area by a stud as will now be more fully explained by reference to the drawings.

In all the figures A is the casing, a the main valve and a a partition (in which is the seat of valve a), dividing the casing A into a high pressure chamber A and a low pressure chamber A in the usual way and as will be fully understood without further description.

In order to insure the desired difference of pressure on opposite sides of partition a. and valve a (which is in general the office of this class of apparatus) the main valve or. is controlled by a motor B, which is connected to valve a and which is automatically moved in a direction to open valve a when the pressure in the low pressure chamber falls below the desired amount, but in a direction to close valve a when the pressure in the low pressure chamber exceeds the desired amount. Motion is given to motor B by steam, (or Water or gas as the case may be) which flows from the high pressure chamber A through a conduit and actuates motorB to move valve or against the force of spring a in Fig. 1, the motion of main valve or in Fig. 1 caused by the motor carrying valve or away from its seat, and the motion of main valve a in Fig. 1 caused by its spring a carrying valve a to its seat.

ward its seat. In Fig. 2 both motions of main valve a are caused by the motor B. In Fig. 3 the motor B tends to move valve or toward These three examples, in one of which the main valve is moved away fromits seat by the motor and toward its seat by a spring, in the second of which the main valve. is moved in both directions by the motor, and

in the third of which the main valve is moved only toward its seat by the motor, are all well known in other forms of this apparatus, and are here shown for the reason that my invention is applicable to all of them.

In all forms a conduit which connects the chamber of motor B with the high pressure chamber is essential, but in my invention that conduit is through the main valve and restricted by a stud, as will now be explained in detail. In Fig. 1, the bore through the main valve extends well down the stem, and a side opening in the stem allows the fluid under pressure to flow from the high pressure chamber through the bore in main valve a and its stem; but this flow is greatly restrict ed by the stud d which almost fills the bore through valve a, so that all the steam which actuates motor B is compelled to leak past stud cl on its way through main valve a. Stud d must not of course fit the bore in valve to so tightly as to prevent motion of valve a from and toward its seat, but with this in mind stud d may be made as snug a fit as possible; for in practice it is difficult to make stud d too close a fit, so long as valve on will move properly on stud d. The steam which thus leaks through valve 0. past stud d fills the chamber 1) in which motor B reciprocates provided the exhaust conduit through stud d from that chamber is closed by the diaphragm F; but when that exhaust conduit is opened the escape of steam through the exhaust is more rapid than its flow through the conduit through valve a, restricted as that conduit is by stud d; and consequently the pressure tending to move motor B can be varied greatly by the motion of diaphragm F; Vhen steam or other fluid under pressure is let on to the apparatus of Fig. 1, it leaks past stud cl and through bore of valve a, and almost instantly fills the chamber 1) of motor B, (for diaphragm F then closes the exhaust conduit) and motor B moves to open main valve a, thus supplying the low pressure chamber. Consequently the pressure in'the low pressure chamber rises and as the low pressure chamber is open through conduit f to the chamber of diaphragm F, that diaphragm will be lifted from stud d as soon as the pressure in the low pressure chamber is sufficient; and as this motion of diaphragm F opens the exhaust con-. duit through stud d the pressure in the chamber 12 of motor B will fall and the force of spring a aided by the low pressure against motor B, in Fig. 1, will close main valve a. Should the low pressure then fall below the desired amount diaphragm F will be forced by its spring f down upon stud d to close the exhaust conduit,when the pressure in the chamber 1) of motor B will'increase, thus opening valve a andsupplying more pressure to the low pressure chamber; but acting as before, as soon as the low pressure is brought back to the desired amount. This operation is the usual and familiar operation, in substance, of this classof apparatuaas will be plain to all skilled in the art; but the new principle involved in my invention is a con duit through'the valve of ample area but restricted by a plug which nearly fills it, and this is a valuable improvement for it not only greatly simplifies the construction of this class of apparatus; but is a far better and more practical plan of obtaining the restricted area of the conduit than any heretofore known.

In Fig. 2, the fluid from the high pressure chamber A leaks'past the stud dand fills the chamber 1) of motor B when diaphragm Fis pressed upon stud d; thereby causing sufficient pressure under motor B to force valve a off its seat, and allow steam to flow from high pressure chamber A to low pressure chamber A But when the pressure in low pressure chamber A reaches the desired amount, it acts, throu gh conduit f, to lift diaphragm F and open the exhaust conduit; whereupon the low pressure, always in chamher I) of motor B, causes motor B to close valve a.

, In Fig. 3 the fluid in high pressure cham ber A forces valve it off its seat, and supplies low pressure chamber A but when the low pressure reaches the desired amount it acts through conduit f to force diaphragm F down upon stud d, and thus closes the exlimited to the conduit through the main valve restrictedby a stud, the other inventions shown herein being described and claimed in my patents, No. 475,585, dated May 24', 1892, and No. 497,985, datedlviay 23, 1893';

What I claim as my invention is In a reducing valve comprising a main valve and'a motor controlling it,-a conduit leading from the high pressure chamber to the motor chamber through the main valve, and a stud restricting that conduit, combined and operating substantially as described.

NATHANIEL o. LOGKE.

Witnesses:

J. E. MAYNADIER, EDWARD I. BEACH.