US500994A

US500994A - Pressure-regulator

Info

Publication number: US500994A
Authority: US
Publication date: 1893-07-04
Anticipated expiration: 1910-07-04

Description

' (N0 Model.) I

N. CURTIS.

' PRESSURE REGULATOR. No. 500,994. Patented Tu-1574,1893,

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m tqes'ses I I lfiyeqifnr NlTED STATES PATENT ()FFICE.

NELSON CURTIS, OF BOSTON, MASSACHUSETTS.

PRESSURE-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 500,994, dated July 4, 1893.

Application filed August 18, 1888.

To all whom it may concern:

Be it known that I, NELSON CURTIS, of Boston, Massachusetts, have invented an Improvement in Pressure-Regulators, of which the following is a specification.

The invention relates to that class of pressure regulators in which the pressure of the fluid operating a mechanism of the system to which the regulator is applied, is controlled by the pressure of a separate or independent fluid; and as in regulators of this class heretofore in use the instrument embraces two valves, onea balanced piston valve in the main passageway of the operating fluid, and the other, an auxiliary valve in a relief passageway from the high pressure side of the said main passageway, which said auxiliary valve is operated in one direction by a spring and in the other by the pressure of the said separate and independent fluid.

The invention consists in a detail of construction, the principal feature of which, as hereinafter set forth is a hook by the use of which the usual directions of the two said counteracting forces controlling the said auxiliary valve, that is, the force of the said spring and the force of said independent fluid, are reversed; whereby in a compact instrument affording great facility for assembling and adjusting the parts, the said operating and the said independent fluids are kept well apart.

As in former pressure regulators used by me, and as in steam traps, and other fluid systems heretofore in use, I employ in carrying out the present invention, a piston valve located in the main passage way of the working fluid, and an auxiliary or controlling valve in a small passage way which connects the two parts of the said main passage way that lie on either side of the port of the said piston valve.

In the drawings, Figure 1 is a vertical ele-; vation of the said improved pump regulator. Fig. 2 is a vertical sectional elevation of the same.

A is a shell or casting provided with hollow horizontal arm's B B and an upright chamber 0 between said arms, the said two arms and chamberforming a main passage-way for steam or other fluid.

D is the piston valve in said main passage- Serial No. 283,059. (No model.)

way having a seat a supported by interior flanges or walls of the shell. The upper part of the piston valve is cup-shaped as shown, and fits loosely in a cylinder b screwed into the walls of the chamber 0 from the top.

E is a hollow piece screwed into-the top of the cylinder 1) and containing the portc of the auxiliary valve F whose stem works tightly through a guide piece cl screwed into the piece E, as shown. I

G is a conical shaped hollow casting bolted as shown to the top of theshell A. It is slotted, as shown, to form a free air space for the purpose hereinafter set forth and to receive the pointof the hook H which takes into the stem of the auxiliary valve F, as shown; and it supports on its top a diaphragm 9 that also rests on the flanged top of the stem of the auxiliary valve F. This diaphragm is held in place by a cap or casting e screwed upon the top ofthe casting G to form atightchamber J above the diaphragm.

The cap e carries an upright projection serving as a support and guide for the hook or arm H and its operating mechanism. This projection passes, as shown, loosely through a coiled spring S in a hole in the upper end of the hook or arm H, and also loosely through a handle piece K that screws into said hole in said arm H to compress the said spring S more or less, the offlce of the spring S being to lift the auxiliary valve F against any pressure there may be above the diaphragm g.

L is a union pipe screwed into cap 6 to serve as the continuation of an inlet passageway to chamber J above the diaphragm from the fluid raised by the pump.

The shell A has within one of its walls a passage N opening intoarm B and communicating with the interior of hollow piece E, which communicates by port 0 with the cup of the piston valve D, which by the loose fit of the piston has communication with arm B,

thus forming the small passage-way for the main fluid hereinbefore mentioned.

A spring, S, helps the piston valve D to its seat when the port a is closed as aforesaid.

In this pressure regulator there is no communication between the fluids of the two systems. Moreover air circulating freely within the hollow casing G separates the operating fluid in the lower part of the regulator from the fluid in the chamber J (this being a portion of the fluid raised by the pump) so that the temperature of the fluid in said chamber J is not'injuriously afiected by that of the operating fluid. If the temperature of the fluid in chamber J were abnormally raised its expansive force or pressure would tend to interfere with the proper movement of the diaphragm. In operation when the pressure of the independent fluid above the said diaphragm g, is less than that of spring S, the auxiliary valve will be lifted from its seat. The smaller passage Way for the main fluid is then opened relieving the pressure above the piston of the main valve in the main'fluid passageway and allowing that valve to open ble side or diaphragm g in contact with the free end of stem of auxiliary valve, hook H and admit a fresh supply of working fluid.

I claim- 1. The combination with a main passage-1 way for fluid under pressure, a piston valve 1 therein, a relief passageway leading out of said main passageway on the high pressure side of said piston valve, and an auxiliary valve in said relief passageway, all within.

shell A, substantially as described, of fluid chamber J, supported by said shell A, and provided with said flexible side or diaphragm g, in contact with the free end of the stem of said auxiliary valve, spring S, and hook H, taking into said stem, substantially as described.

2. The combination with a main passageway for fluid under pressure, a piston-valve therein, a smaller passage-way connecting two parts of the said main passage-way, one above and the other below the port of said pistonvalve and an auxiliary valve in said smaller passageway, all withiushell A, substantially as described, of fluid chamber J, supported by said shell A and provided'with said flexitaking into said stem and spring S, substantially as described.

NELSON CURTIS. Witnesses:

W. W. SWAN, WM. S. ROGERS.