Fluid peessnre regulator
US 404504 A
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Description (OCR text may contain errors)
(N6 Model.) W. ROSS.
FLUID PRESSURE REGULATOR. No. 404,504. Patented June 4, 1889.
? NITED STATES PATENT @FFIGE.
VILLIAM ROSS, OF TROY, NE\V YORK.
SPECIFICATION forming part of Letters Patent No. 404,504, dated June 4, 1889.
Application filed May 28, 1888. Serial No. 275,315. (NommleL) T0 aZZ whom it may concern: 7
Be it known that I, W'ILLIAM ROSS, a resident of the city of Troy, in the county of Rens'selaer and State of New York, have in vented certain new and useful Improvements in Fluid-Pressure Regulators; and I do hereby declare that the following is a full, clear, and exact description, of the invention such as will 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 theletters of reference marked thereon, which form a part of this specification. 7
Similar letters refer to similar parts in the several figures therein.
My invention relates to improvements in fluid-pressure regulators; and it consists of the novel construction and combination of parts hereinafter described, and pointed out in the claim. a
Figure 1 of the drawings is a central longitudinal section through a little more than one-half the. device, the remaining portion being uncut to present an exterior view in elevation. Fig. 2 is a bottom plan view of the device as shown in Fig. 1, with cap 72 removed. Fig. 3 is a central longitudinal section of the valve-stem and appurtenances dctached from the case. Fig. l is a bottom plan view of the valve and stem.
The regulator hereinafter described is primarily intended as an improvement -upon the device shown in United States Letters Patent No. 219,114, issued September 2, 1879, to G. Ross for improvements in fluid-pressure regulators, but may be applied to other styles of regulators.
The main object of the invention is to prevent excessive vibrations of the valve and do away with the pounding of the valve upon its stop or seat.
When valves have been constructed to move to and fro in a cylinder to open and close an induction-port, as shown in said Patent No. 219,114, or are located in the inletchamber of a valve-case and move to and from a seat located at the junction of that chamber with a passage-Way leading to an outlet-chamber, as pressure-regulators have been heretofore constructed, it has been found that a slight variation in the initial .pressu re or the amount of work to be performed at the by a passageway having a combined stop and seat for the valve at the junction of the passage-way with the outlet-chamber and placing the valve in the outlet chamber I amable to wholly overcome the vibratory pounding of the valve.
By placing the valve in the outlet-chamber it is compelled to travel against the current of incoming fluid into its seat and stop, and the inertia of the moving fluid, which is caught between the valve and its seat, serves as a cushion, and before the unbalanced valve can come into actual contact with the seat its inertia is overcome and the balance restored. When the valve is placed in the inlet-opening and arranged to travel in the same direction as the outflowing fluid in going to its seat or stop, the inertia of the fluid, aided by its frictional contact when the valve is near its seat or stop, seats the valve or forces it to its stop with a blow.
A represents the inlet and B the outlet of case 0. The inlet-chamber A is separated from the outlet-chamber]? by the diaphragm A (Shown partly in dotted lines.) The two chambers open exteriorly through the inlet and outlet, and are connected interio'rly by the passage-way B consisting, preferably, of a circular opening through the diaphragm.
The walls of the diaphragm are preferably beveled on the side contiguous to the outletchamber to form a combined seat and stop A for the valve D, which is correspondingly beveled on its seatengaging edge D-'. The valve -is fixed upon or forms a part of the stem D The piston E is formed for a steam-tight fit in the cylinder, and preferably consists of a cup-leather secured upon flange E by a nut E secured upon the threaded end 1) of the stem, and maybe of any desired area, so long as the part of the cylinder in which it travels is formed to fit it. The other piston D* is located between the piston E and the valve and travels in the same cylinder with valve E, or a cylinder open to it and to the inlet-chamher. This piston not formed for a steamtight fit in its cylinder, but fits so closely as to practically cut off the passage of steam or other fluid from the inlet-chamber to the cupleather piston without binding upon the cylinder-walls sufficiently to offer a material frietional resistance to its reciprocatory movements. This valve is preferably made of a succession of metallic flanges D, which will not change in form or frictional contact with the cylinder under high pressure. The pressure-areas of this piston and the valve should be substantially the same. The valve-andpiston-connecting stein D is also provided with a runway D connecting the space in the cylinder between the two pistons with the outlet'chamber.
A regulating-spring S is seated at one end upon the outer side of the cup-piston or the projecting end of its supporting-stein and at its other end upon an adjusting hand-screw \V, movable in a threaded support secured to the valve-case.
The spring may be inelosed in a case S, provided with an opening to the atmosphere, as S The lower end of the valvecase may have an opening C through which the pistons and valve can be inserted within the case, and a screw-cap nfor covering the same.
The operation of the regulator is as follows: The spring S is adjusted to force open the valve and resist a pressure tending to close the valve just equal to the pressure desired, and the fluid admitted through inlet A to the inletehamber at ahigher pressure. The fluid passes freely through the open passageway into the outlet-chamber until the pressure therein equals the desired reduced pressure, whereupon the fluid acts upon the cuppiston to overcome the force of the spring and close the valve, thereby cutting olf the passage of the fluid into the outlet-chamber or materially reducing it and maintaining an approximately constant reduced pressure in the outlet-chamber. Constant because the valve is balanced to the inlet-pressure by the contiguous piston D", and to the outlet-pressure by the spring which may be adjusted to resist different degrees of pressure, as desired. 3y interposing the comparatively loose-fitting piston between the inlet-chamber and the tight-litting piston the pressure of the fluid is greatly reducedbel'ore it reaches the tight-fitting piston, the object being to reduce as much as possible the friction between the piston and its cylinder, thereby rendering the valve more sensitive to slight variations of pressure in the outlet-chan1ber.
If a cup-leather or other tight-fitting piston should be balanced under very high pressure, the friction would become so great as to require a variation in the balance of several pounds pressure to move the piston and its connected valve.
By reducing the pressure upon the tightfitting piston as I have described the piston becomes very sensitive to variations in the balance and can be made of a small area. As the piston is balanced between the outletpressure and an adjustable spring, its area is only limited by convenience in construction.
A regulator constructed as I have described is "cry sensitive and will automatically maintain a reduced pressure as long as desired without appreciable variation. As heretofore constructed, sensitiveness and accuracy, it had at all, could only be had at the expense of excessive valve-pounding, previously explained. By seating and stopping the Valve against a current of valve-approaching fluid the valve will not come in contact with its fixed or metallic seat before the balance restored. It is of no consequence that some of the fluid escapes from the inletchambers past the piston D so long as it is not sufficient to raise the outlet-pressure above the minimum low-pressure required when the regulator is in actual use, for the reason that the cylin- Ger-space between the two pistons is connected with the outlet-chamber through the runway D in the valve-stem, preventing any accumulation of pressure upon the tight-fitting piston.
lV hat I claim as new, and desire to secure by Letters Patent, is
In a fluid-pressure regulator, a valve-case having inlet and outlet chambers opening exteriorly and connected interiorly by a passage way, in combination with a combined valveseat and stop located at the junction of the passage-way and the outlet-chamber, a valve placed in the outlet-chamber and movable therein to and from said seat, a piston-cylinder, a piston-con trolling spring, and two valveaetl'lating pistons connected by a common stem with the valve, one of the pistons fitting the cylinder more tightly than the other, and
the cylinder-space between the pistons being connected with the outletchamber by a runway, substantially 2 described.
In testimony whereof I have hereunto set my hand this 21st day of May, 1588.
Geo. A. Mosnnn, Gno. F. Nicn'oLs.