US1108950A - Reducing-valve. - Google Patents

Description

uur ourson REDUCING-VALVE.

incasso.

Specification of Letters, Patent.

Patented Sept. 1, 1914.

Application led August 23, 1912. Serial No.- 716,777.

To all whomz't may concern Be it known that l, GEORGE H. View, of the city of Montreal, in the Province of Quebec andDominion of Canada, have invented new and useful Improvements in B educing-Valves, of which'the following'is a full, clear, and eXact- 'description t This invention relates to improvements in reducing valves, and the object is to provide a valve-of strong and simple construction which maybe very accurately adjusted to reduce a uctuating fluid pressure to a lower and uniform fluid pressure.

A further object is to provide areducing valve particularly designed to be used in connection with heating and drying systems, in which it is essential to maintain the steam at a low and unvarying pressure for long periods of time, regardless'ot variations in the pressure of the steam supplies.

1n the drawings which illustrate the invention Figure l is a vertical longitudinal section of the reducing valve. Fig. 2 `is a horizontal section on the line 2-2, Fig. 1.

Referring more particularly to the drawings, 3 designates a casing provided at op@ posite ends with-flanges 4 or other suitable means for attaching the valve in av pipe line. The inlet and outlet passages 5 and 6 respectively of the body are-separated by a diaphragm 7, asis usual in the structure of globe valves. The top of the valve'is provided with-alarge circularopening 8 which communicates with the qutlet passa e 6. Thel bore of this opening; is carried own through the outlet passage 6 and nearly through the diaphragm 7. A. slightly smaller aperture 9 is ormed through the diaphragm so that a shoulder 10 `is formed uponwhich is seated a bushing 11 which may be driven or screwed into the opening 8. The lower end of this bushing is provided with an internal ange 12. As will be seen inthe drawings, the outlet passage 6 and vbushing 11 are so arranged that the passage extends entirely around the bushing. Communieation between the interior of the bushing and the outlet passage is -established through a plurality of apertures' or ports 13 formed through the wall of the bushing. A piston 14 is slidably mounted in the bushing and is of suiiicient depth to Coverall the ports 18. The lower side of the piston is concave and is provided at the center with a downwardly extending hollow projection 15.

Below the piston is a disk 16 hav-ing a circumferentially grooved post 17, which enters the projection 15 and is held against re- .ciprocator-y movement relative thereto, but

is permitted rotary movement by means of a pin 18 fixed in the projection 15 and engaging the groove 19. This disk 16 rests on the flange 12 and limits the downward movef ment of the piston 14. A plurality of -apertures 20 are formed through the disk and communicate through the aperture 9 with the inlet passage 5. rlf'he valve stem 21 is provided at vits lower end with a collar 22. A split nut 23 is screwed into the upper sur- -face of the piston and bears against'the upper surface of the collar 22, so that the valve stem is attached to the piston and is at the same time allowed to revolve relatively thereto. The central portion of the valve stem is provided with screw threads 24 which engage with corresponding threads25 formed in a neck 2.6, whichis rigidly secured to the upper part'of the body 3. The valve stem passes out of the neck through a stuiiing box 27, and may beprovided with any suitable rotating means such as a hand wheel or crank, indicated 4at 28.

The operation ofthe valve will be .well understood from the drawin and need'only vbe brieliy described. T e steam enters through the passage 5 and passesinto the .bushing 11 through the apertures 20 of the disk 16. When the valve stem is rotated suiiiciently to uncover a suitable area of the ports 13, the steam rushes through these ports into the outlet passage 6. It will be readily understood that it will be possible to provide a greater outlet area in the apertures 13 than in the apertures 20, so that steam at highy pressure passes through the apertures 20 and expands within the bushing 11 under the piston, and then passes through the ports 13 at reduced pressure and velocity and eX- pands into the large outlet passage 6. The concave lower face of the piston 14 has a tendency to throw the steam back upon itself,

so'that the velocity of the flow is checked. By raising the piston only a small amount, a very small port opening can beobtained, so that steam entering the valve at very high pressures will leave at very low pressures.

Having thus described my inventiomwhat I claim is z l. A reducing valve comprising a body having inlet and outlet passages, a cylinder in said body communicating through its end with the inlet passage, ports in the curved Wall of said cylinder communicating with the outlet passage, a piston valve in said cylinder an apertured disk carried by said piston valve and spaced` therefrom, and means for reciprocating the valve to cover and uncover the ports.

2. A reducing valve comprising a body having inlet and outlet passages, a cylinder in said body communicating through its bottom With the inlet passage,A ports in the curved Wall ofsaid cylinder communicatin with the outlet passage, a piston in sai cylinder havinga concave lower face, an

apertured disk carried by the piston limiting fluid flow through the bottom of the cylinder, and means for' reciprocating the piston to cover and uncover the ports.

3. A reducing Valvey comprising a bodyv having inlet and outlet passages, a cylinder in the body having apertures communicating with the outlet and with the inlet, a piston valve mounted to reciprocate in said cylinder having a downwardly extending projection and an apertured disk provided with a post revolubly mounted in said projection.

In Witness Whereoi` I have hereunto set my hand in the presence of two Witnesses.

GEORGE H. VIGER.

Witnesses:

STUARD R. W. ALLEN, G. M. MORELAND.

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