US686791A - Reducing-valve. - Google Patents

Description

N0. 686,79I. Patented Nov. l9, I9Dl. J. WESTLEY.

REDUCING VALVE.

v (Application filed July 2, 1901.) (No Model.) 2 Sheets-Sheet No. 686,791. Patented Nov. 19, I901. .1. WESTLEY.

'manucme VALVE.

(Application filed. July 2, 1901.)

(No Model.) 2 Shaats-Sheei 2.

UNITED STATES l PATENT OFFICE.

JAMES VVESTLEY, OF LEVENSHULME, ENGLAND.

REDUCING-VALVE.

SPECIFICATION forming part of Letters Patent N 0. 686,791, dated November 19, 1901.

Application filed July 2, 1901. Serial No. 66,886. (No model.)

To ctZZ whom it may concern:

Be it known that I, JAMES WESTLEY, brassfounder, a subject of the King of Great Britain and Ireland, residing at 10 South View, Belvoir avenue, Levenshulme, in the county of Lancaster, England, have invented a certain new and useful Improved Reducing- Valve, (for which I have made application in Great Britain, No. 4,349, dated March 1, 1901,) of which the following is a specification.

This invention relates to an improved reducing-valve for delivering steam and other fluids at a reduced pressure, as is well understood.

The accompanying drawings, to which I will refer, clearly illustrate my invention.

Figure 1 is an outside elevation of my improved reducingvalve; Fig. 2, asectional elevation; Fig. 3, a plan. Fig. 4 is a cross-section; Fig. 5, an end View, and Figs. 6 and 7 detail views.

In constructinga reducing-valve in accordance with my invention I provide a suitable valve box or chamber a with a steam-inlet b and steam-outlet e, which outlet is governed by an equilibrium-valve d d, provided with suitable valve-seatings e e. In the usual type of reducing-valve the equilibrium-valves are carried on a common rigid spindle.

Owing to the unequal expansion of the metals forming the valve-box and valves when subjected to the hot steam or fluids itis found in practice that the valves are not steamtight, thus permitting the passage of steam when such ought to be cut off. An essential feature of my invention is the means I adopt to obviate this, which I do by making the valve-stem elastic or extensible, so that the pressure of steam will tend to extend the -valves apart and thrust them upon their seat- 5 fand jaw g, as will be seen from an inspection of Fig. 2. V

The valves cl (1 are preferably formed with ball-seatings and are connected together by means of an eccentric i, which works in the slots formed in the divided valve-stem, the rotation of the eccentric raising or lowering the valves (Z d, as required. To render the valve-stem slightly extensible, a clearance is provided for the eccentric at the top of the slot in the spindle-half g and at the bottom of the spindle-half f. As shown in Figs. 2 and 4, the valves 01 d are closed. On the expansion of the metal the valve 01 shown at the top can rise with the expanding metal, owing to the clearance provided at the bottom of the slot h in the stem f. If the valves d Were rigidly connected together, the expansion of the valve-box a would cause leakage at the lower valve. By means of the clearance in the slot 71. in the stem-half g the lower valve cl can follow up the expanded metal and is thrust fluid-tight upon its seat by the incoming pressure of'steam or other fluid.

One end of the eccentric-pin 2' is provided with a bearing in the valve-box a, the other end protruding through a packed gland j, formed in the box, and which protruding end is squared and provided with a lever is, carrying an adjustable load I. p

The cover m of the valve-box a is formed with a steam-chamber n,com municating with the steam-space behind the valves 01 by means of a port 0. Screwed to the steam-chamber 'n, is a cylinderp, containing a piston g, which works fluid-tight in the cylinder by means of a flexible packing-ring r, jammed to the end of the cylinder p by a nut 1", as shown in the enlarged view, Fig. 7. Steam-pressure escaping between the cylinder and the piston and entering the cavity 8 tends to thrust the flexible ringr against the piston, and so render it fluid-tight. A finger 25 upon the loaded lever is bears against the piston q. The load Zis adjusted upon the lever 75 to rotate the eccentric z', and so open the valves d cl.

As shown in Fig. l, the valves are open, and by adjusting the load in varying positions upon the lever any required reduced pressure of steam or other fluid can be obtained, the steam passing through ports 0 c to the delivery-outlet c. The cylinder 19 can be provided with a pressure-gage u, if desired, to ascertain the reduced pressure to a nicety, or where such gage is not required this end of the cylinder p can be plugged up. When the pressure of steam behind the valves 61 d begins to exceed requirements, the loaded lever 7c is overcome by the pressure acting upon the piston g, which is thrust out of the cylinder p, and thus acts upon the lever is to rotate the eccentric i and close the valves d d.

If desired, the valve-box a may be provided with more than one steam-outlet, as shown in the dotted lines c, Fig. 1.

In Fig. 6 I show a modified method of actuating the eccentric t by means of toothed gearing. The piston q is provided with a rack 10, gearing with a pinion :1; upon the eccentric i. The loaded lever is is pivoted at y and carries a toothed quadrant ,2, also gearing with the pinion a; on the eccentric i.

I declare that what I claim is- 1. In a reducing-valve for the indicated purpose a balanced valve having an-extensible valve-stem adapted to compensate for unequal expansion of metals and so prevent leakage when the predetermined reduced pressure is attained and the valves are closed, substantially as described.

2. In a reducing-valve the combination of the valves d (1 formed with a divided and extensible valve-stern, with the eccentric i and the means for operating the eccentric to open and close the valve substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

JAMES WESTLEY.

Witnesses:

JOSHUA ENTWISLE, ALFRED YATES.

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