USRE13272E - cheistman - Google Patents

Description

M. OHRISTMAN & E. JOHNSON.

PIsTON VALVE. APPLICATION FILED JULY 5.1910.

Reissued July 1 8, 1911. I

M. CHRISTMAN &"E. JOHNSON,

PISTON VALVE.

APPLICATION FILED JULY 5, 1pm.

Reissued July 18, 1911.

of which isto easily operated.

To all whom it may concern:

UNITED STATES PATENT OFFICE.

MATTHIAS GHRISTMAN AND EDWARD 'Be it knowirthat we, IIATTHIAS CHRIST- "MAN and Eowann Joiinson, citizens of the. United States, and residents of Springfield in the county of Greene, State of Missouri,

have invented certain new and useful 1m; provenients -in Piston-Valves, of Which the following is a specification: I

Our invention relates to improvements in valves for air-and liquid pumps, the object provide a reversing piston valve that will be steam tight, durable and Figure 1 is a? longitudinal sectional view showing the entire device. Fig. 2, is a transverse view. Fig. 3, is the outer bushing, showing steam and exhaust ports. Fig. 41

is the end view of the inner bushing. 'Fig.

is a view showing the valve and bushing applied to a duplex pump. Fig.6, is a vertical section showing the bushing as made in one piece. Fig. 7, is a section of the one-piece bushing, on the line VIIVII otFig. 6.

A is the outer bushing having ports at one end A I B is the inner bushing that fits into the outer bushing A, and is' provided with ribs B which separatepner andouter'bushings, forming ports or passages A lengthwise 01" bushings and also has steam passages in each 'C is a valve Whichis made circular to fit into'the' inner bushing-B and has radial braces or-spokes at each end, and is provided with one or more packing rings C (and is. provided with openings O at each end or valve). Said valve is made hollow so steam can pass through valve, which makes this valve perfectly balanced. Said valve is pro- Steam from the boiler enters at steam' ports A and then passes through ports or passages A and then steam passes through ports B to the valve C, p

As shown in Fig. 5, the, right steam piston has completed its stroke and forced the valve C down, which is connected with the reversthe steam port E JOI-ItNSON, OF SPRINGFIELD, MISSOURI.

PISTON-VALVE.

v Specification of ReissuedLetters Patent. Reisgued July 18 1911, Original No. 904,839, dated November 24, 1908, Serial No. 400,116. Serial No. 570,505.

Application for reissue filed July 5,

ing rod F, and the valve C has uncovered the upper steam port E which will admit steam in the upper port in the left steam pylinder of the air pun'ip ithrough suitable ports or passages vbetweeii both steam cylinders. The steam forces the left steam piston in the air pump down, which strikes the re vex-sing rod F which is connected with the valve C and moves the valve C down, which closes the lower steam port Ff, and uncovers the upper steam port E Steam is then admitted to the-right steam piston in the bottom end through suitable ports or passages in the cylinder head of the air pump to theright steam cylinder."'Theright steam piston then moves upward, pulls the valve G up, which is connected with the rev rsing rod F and a plate tapped to the bottom of the right steam piston. Thevalve C then closes the upper steam port E and the steam that has been expanded in the upper end of the left steam cylinder of the air pump, passes back' through suitable ports or passages between both steam cylinders, back through the steam port l1.- and out through the exhaust cavity cut in the valvejl and out through the exhaust port D which corresponds with ports or passages in the cylinder head of the air pump, out into the atmosphere.

The lower steam port E is new uncovered. Steam now passes over to the bottom of left steam piston inth'e air pump through suitable ports or passages in the cylinder head of the air pump. The left steam piston in the air pump is on an upward stroke- It pulls the valve C up, which is. connected with the reversing rod F and a plate tapped to the bottom of the left steam piston in the air pump, the valve closes the upper steam -port E and the steam that has been expanded in the lower end of the right steam "cylinder of 'the air pump passes back through suitable ports or passages in the cylinder head of the air pump, back through and out through the en: haust-cavity out'inthe valve U, and out through the exhaust port D which correspends with suitable ports or passages in the 'cylinderhead of the air pump, out into the atmosphere. a

The bushings can be madein one piece, but are preferably made separate. The outer bushing made ofsteel or wrought iron. The i as I inner bushing made of cast iron; making it no cheap and easil. renewed when worn. In "'cally in the bushing and provided with the ongpiece fii s hing, shown in Figs. 6 and packing rings engaging the same and di- 7, tlfi partswhich correspond to similar ametrically' reduced between the packing parts in'the two-piece bushing are identified rings'to form anexhaust cavity of sufficient 60 by the same reference characters. =5 length to establish communication between Having thus described the invention What either of the inlet ports and the said exhaust we claim as n wand desire to secure by Letport; said valve being'also open from end to ters Patent of the United,States,'is: end to, permit steam to exteriorly bear 1. In combination 'with an engine cylinagainst both ends of and balance the valve, 65 10 der steam chest, suitable ,inlet and exhaust and a reciprocatory rod secured to an expassages an. outer bushing, an inner bushtending through the valve. ing, longitudinal fluid passages between said 5: A piston valve, comprising a stationary bushings, a ort at each end connecting the hollow cylindrical bushing closed atboth interior of t e inner bushing with said lonends and provided with a longitudinal chan- 70 gitudina-l passages, a piston valve connected nel and ports connecting the opposite ends to reciprocate within the. inner bushing,c said 7 of said channel with the adjacent endsof the valve comprising two heads spaced apart chamber of the bushing; said bushing being a to form an exhaust groove, spring packing also prqvided with an 0 ening .to admit rings on each head,'and ports through both steam to said channel an with a pair of .75 bushings to connect with said inlet and exinlet portsfand an exhaust port between the haust passages, substantially as shown and inlet ports, a valve arranged reciprocally in described. Y the bushing and rovided peripherally with 2. In combination with an engine oylin:- ,packingrings and diametrically reduced be: der, steam chest, inlet and exhaust passages tween said packing rings to form a chamber 80 a valve casing comprising two concentrie. of-length sufficient to establish communicabushings, fluid passages between the bush tion between either of the inlet ports and the ings connected with the interior-of the inner exhaust port; and a rod secured to the valve bushing at the ends thereof, a piston valve and extending slidingly through one of the bored to receive a valvest'em, a slip pinhole closed ends of the bushing. 85 to one side of'and connecting with thebore 6. A piston valve comprisin a stationa to allow the valve stem to be fitted, and a hollow cylindrical bushing closed at bot valve stem ada ted to snugly fit said bore ends and-provided at one end with a steijfmj and having col ars thereon to prevent end-. supply port for the passage. of steam v wise slipping of the valve, substantially as the bushing and provided also with an 'ex- 90 shownand described. haust port about midway its length and a 3. A piston valve having passages extendpair 'of inlet ports, one of the inlet ports ing therethrough to permit of the valve belying between the exhaust port and the ing perfectly balanced, a central bore steam supply port and the other inlet port through which passes a valve stem, said at the opposite side of the exhaust port 95 40 valve stem fitted with collarsa-t each end of from the first-named inlet port, a valve fif the'valve to prevent endwise slippingof the ting reci rocally in the bushing and; disame, and a slip pin hole adjacent to the ametrical y reduced to form a surrounding bore by means of which the valve stem may exhaust cavity of sufficient length to esbe fitted to the valve, substantially asshown tablish communication between either of the 100 and described. I inletports and the said exhaust port, said A'piston valve, comprising a stationary valvbe'mg also open from end to end to 'h ollow cylindrical bushing closed at both permit steam to bear exteriorly against botlr ends and provided at one end with a steam ends of and balance the valve, and a reciprosupply port for the assage of steam "into the catory rod secured to the valve. 105

bushing, and provic ed also with an exhaust In testimony whereof, we aflix our signaport about midway its length and apair of 'tures 'in the-presence of two witnesses. inlet ports, one of the inleLports lym'g' be MATTHIAS CHR-lSTMANi tween the exhaust port and the steam supply EDWARD JOHNSON.

port, andthe other inlet port of the opposite Witnesses side of the exhaust port from tltelc-first- -W HO namedinlet port, a valve fitting fem pro JOHN J. SCHNEIDER.

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