US735294A - Steam-trap. - Google Patents

Description

No. 735,294. i PATBNTED Ava-4, 1903. W. J. POOLE.

STEAM TRAP.

APPLICATION FILED FEB. Z4, 1903. N0 MODEL.

A \\\E u w a n n: Nenms prrins m. PHO

' a subject of the `King ofGreat Britainand Ireland, and a resident of 19.Waverley'R-ark,`

Patented August 4, 190e.

PATENTn OFFICE.

WILLIAM J. POOLE, OF HIGH SHAWLANDS, SCOTLAND.

sTEAM-TRA P.

srncrrrcerrolv feruuiug peut ef Lettere retenu No. 735,294, dated August 4, 190e.

` appiieeueu het rebfuery 24,1903, `saiu11ta144n54. (ne model.)

fTO ctZZ whom, ijn/ay concern:

Be it known that I, WILLIAMJOHN POOLE,

High Shawlands, in the county of Glasgow, Scotland, (whose postal address 'is 19 Waver` ley Park, HighlShawlands, Glasgow, Scotland,) have invented certain new Improvements in and Connectedwith. Steam-Traps,

(for which I have applied for a British pat-` ent, No. 17,281, dated` August 6, 1902,.) of

which the following is a speciication.

My said invention relates to steam-traps of .the type in which is used an inverted bell havinga central guiding-spindle, and has for its object to improve the construction of such steam-traps so that the opening of the discharge-valve will not depend `merely on the weight of the bell when the water of condensation overflows thereinto, asis usual with this class of steam-trap, but will be controlled by the action of the uidon a piston part connected to the discharge-valve, the supply of the Huid to this piston being controlled by a small valve actuated by the float. My invention also comprises means whereby the valves are kept tightly on their seats in order to insure that .the bell shall not be emptied by leakage past vthe valves when they are closed.` p f i My present invention is preferably applied in connection with steamtraps provided with the improved device `for causingV the valves to grind on their seats after closing as described in my patent specification Serial No. 73,074.

In carrying out my invention in the case` of a steam-trap such as is shown in vertical section in the accompanying sheet of draw ings there floats in the water of condensation in the trap A the usual inverted bell A', having attached to it in the usual manner a central spindle A2; but insteadof this spindle carrying the usual discharge-valve it has on its upper end a small valve A2, hereinafter termed a,pilotva'lve, controllingapassage B, formedthrough a main discharge-valve B and communicating with the upper end of a cylinder B2, in which works a piston B8, connected to the upper end of the discharge-Valve B', but of larger area than such valve. The central spindle A2 is guided by vanes O thereon, bearing on vthe inner side of a tube O', attached to and extending 1down from the discharge-valve B into the lbell A. This tube C is not rigidly tixed to the main discharge-valve B', but is attached 'thereto by looselyfitting screw parts and locking-pins C2, so as to give a slight amount lof flexibility to the joint, so that any want of `alinemen`t of the inner tube C or outer main discharge -pipe C3, hereinafter referred to, shall not prevent the main discharge-valve 3B from closing tightly on its seat D, .and also shall not prevent the tube C', valve B', and pistonBSfrom together revolving and moving vertically, as hereinafter described, with the minimum amount of friction. The tube C has on its outer side vanes D', which bear on Athe inner side of the main discharge-pipe O2, dippinginto the bell A', and the tube has also on its lower end a weighted ring or ily-wheel D4 for a purpose hereinafter described.

When the inverted bell A is in its highest position, the pilot-valve A3 and the dischargevalve B are both closed by the buoyancy of the bell and the pressure of the fluid on the `'tube C and discharge-pipe C2. When the 1bell Af sinks,the small valve A3 is opened,and water rising through thetube C ows through ithe passage B in the discharge-valve B into ,the cylinder-space B2 above the piston B2. The upper side of the piston B3 and the lower side of the discharge-valve B are now under `approximately the same pressure; but the area of the piston being greater than that of the discharge-valve. the latter is forced downward, land the fluid" then escapes up the main discharge-pipe C3 and through the opening controlled by the main valve into the discharge D2. When the piston B3 has moved down the requisite distance to open the discharge-valve B this movement uncovers a relief ort D2,

,B3 therefore moves upward again until the relief-port D3 is partly closedand a state of IOO equilibrium reached between the pressures on the lower side of the discharge-valve B and the upper side of the piston B3. When the bell A' is partly empty, it rises sufficiently to close the pilot-valve A8 on its seat and so cut off the supply of tluid to the cylinder B2, and as the piston B3 is not a close lfit in the cylinder the pressure therein falls, owing to leakage, past the piston. As the fluid thus escapes from the cylinder B2 the piston BB rises, owing to the combined action of the pressure on the lower side of the dischargevalve B and the buoyancy of the bell A, and the discharge-valve is broughtto its seat.

In steam-traps of this type if the dischargevalve B or even the pilot-valve A3 should from any cause be kept from closing tightly on their seats the steam-pressure in the trap causes the water which should otherwise gather in the bell A to siphon out past either the leaky main discharge-valve B or in the case of the pilot-valve A8 past that valve and past the piston B3, the latter not being a tight fit, and owing to this leakage the bell A does not flll and sink, as it should do. To overcome this defect, I form a small opening E not only through the discharge-pipe C3, but also another similar opening E through the inner tube G', these openings being below the valves. By this means I obtain equilibrium of steam-pressure in the bell A and in the discharge-pipe C3 and tube C above the level ot' the water therein. This prevents the water rising in the discharge-pipe C3 or in the tube C and allows it to gather in the bellA until its weight is such that the bell sinks, as usual. The size of the openings E E must be considerably smaller than the passages controlled by the valves A3 or B', so as to prevent the possibility of the steampressure inthe discharge-pipe C3 or in the tube C interferring with the free action and discharge of the water of condensation once the bell does descend, as hereinbet'ore described. The guiding-vanes C D' are so constructed and held that when the water of condensation is being discharged, as described, not only will the bell be revolved as it empties and rises, as described in my patent specification Serial No. 73,074, but also the tube C, attached to the discharge-valve B and carrying the {1y-wheel D4, the vanes OD being so carried that these parts and ,the two valves A3 B rotate in opposite directions, the piston B8 also rotating with the valve B. When the valves have reached their closed positions again, the momentum which the bell A and the fly-wheel D4 have gained will make both valves turn on their seats more or less and 6o insure the desired grinding action being obtained. l

What I claim as my invention is- 1. A steam-trap, having a discharge-pipe, a main discharge-valve and a piston'controlling the outlet from such pipe, a pilot-valve opening into a normally closed chamber, the piston-working in said chamber, and an in verted bell to control the movements of the discharge-valve and piston, substantially as described.

2. A steam-trap having a discharge-pipe, a discharge-valve and a tube attached thereto within the pipe, a piston on such valve, a cylinder in which the piston works, a reliefport from the cylinder, a passage through the valve and piston, a pilot-valve controlling the passage, a spindle carrying the pilot-valve and an inverted bell attached to such spindle, substantially as and for the purposes described.

3. A steam-trap, having a discharge-pipe, a main discharge-valve and a piston controlling the outlet from such pipe, a pilot-valve opening into a normally closed chamber, the piston working in said chamber, and an inverted bell to control the movements of the discharge-valve and piston, in combination with means for rotating the valve so arranged that the passage of iiuid against them during discharge will rotate the valve, whereby it is caused to grind on itspseat upon and after closing, substantially asdescribed.

4:. A steam-trap having a discharge-pipe,

a main discharge-valve and a piston controlling the outlet from such pipe, a cylinder for the piston, a relief-port from the cylinder and a passage through the Valve and piston, a pilot-valve controlling the passage, a tube attached to the discharge-valve and extending down within the discharge-pipe, a spindle carrying the pilot-valve, an inverted bell attached to the spindle, and a small opening formed through both the tube and dischargepipe below the level of the valves, substantially as and for the purposes described.

5. A steam-trap having a discharge-pipe, a discharge-valve and piston therefor, a pilotvalve for the main Valve, a spindle carrying the pilot-valve at one end and an inverted bell at the other, a tube attached to the discharge-valve and extending down beyond the end of the discharge-pipe, a fly-wheel on-the tube and vanes on the spindle and on the tube, substantially as and for the purposes described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM J. POOLE.

Witnesses:

. DAVID FERGUSON,

GEORGE PATTERSON.

ioo

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