US 702157 A
Description (OCR text may contain errors)
Patented Julie I0, I902.
RELIEF VALVE. (Appliceion filed Oct. 7, 1901.)
2 Sheets-Sheet I.
I i Elniintoz I l vi human No. 7u2,|57.. Patented lune I0, I902. j F. SGHREIDT.
7 (Application filed Oct. 7, 1901.)
(No Model.) 2 Sheets-Sheet 2,
. anwnl'ozi and State'of'Ohio, have invented certain new UNITED STATES PATENT OF CE.
FRANK soHREIDT, or" MANSFIELD, OHIO.
" 'SPEGIFICAT'ION forming part of Letters Patent no. 702,157, dated June 10, 1902.
To all whom it may concern.- Be it known that I, FRANK SoHREID'r, a citizen of the United States of America, and a resident of Mansfield, inthe county of Richland and useful Improvements in Relief-Valves, of which the following is a specification. v The object of my invention is a relieffv'alve which is held shutfnot by a'spring that is IO regulated to a certain tension ,whichhwhen exceeded allows thevalve to openfor the escape of water of condensation, but by steam upon the live-steam end of the cylinder andwhich is opened upon the exhaust end ofthe I 5 cylinder for the escape of the water of con densation, either by any pressure of the water which is great enough to lift the weight of the valve or isheld open constantly when there is no steam-pressure upon it. This'object is attained by the means described in the specification, particularly pointed out in' the claims, and illustrated in the accompany- 7 *ing drawings, in w-hi'ch- .7
Figure 1 is a longitudinal vertical central. 2 5 sectional view of a relief-valve embodying my invention. Fig. 2 is a horizontal sectional view of the same, taken upon lin'ezz of Fig. 1. Fig. 3 is a detail perspective view of the main valve. .Fig. 4 is a detail end view'of the cams stem of the hand-wheel for lifting the main valve. Fig. 5 is a viewysimilar to Fig. 1, of a modified form efv'alveg 'Fig56is a sec-: tionalvlew ef'thesafilfertaken'upon line 1; v of Fig. 5. Fig. 7 is adet'ail plan view, of the auxiliary valve. Fig. 8' is a similarview of the main valve. Fig. 9 is an inverted plan view of the in'ain valve. V I
Referring toFigs. 1 toe, cylinder-easing A of the main valve'has a lateral externally-screw?- threaded extension a 'tobe screwed into the I end of a steam-cylinder. At its lower end casing A has an inwardly-projecting horizontal flange, which forms seat a for main valve 13, and an exteriorly-screw-threaded extension a the lower end of whichforms the seat for the -secondary "valve 0; whose valve-case. c is interiorly screw-threaded at each of its ends, the upper end to engage extension a and the lower to,be connectedrto an exhaust- Casing c has a cross-bar 0 formed integral with it, which has a central perfora tion through which the stem 0 of secondary Serial no. 77,805. (No model) valve 0 projects." The valve is held yieldingly to its seat by alight spring 0 Above extensiono a by-pass a is "integral with easing A and communicating with a port 0L -in'the walls of the casing.
:The upper enchof the casing is closed by a Main valve B has near its upper end 'alarge horizontal'fiange'b, whichfits against the walls of the casing and when the valve is upon its seat comes just below port a, so as to leave it uncovered. Above flange b the main valve. "hasfla cup 17 upon. the sides of which arever; tic'alwings b to contact the inner walls of I cap D to assist in guiding the main valve to and from its s'"eat, a function inv which they formed are assisted by wings bfat the lower end of l the m'ain'valve, which contact theinner walls of extension a [Below flange b is a'flange '6", under whichthe cam-shaped end of stem 6 of hand-wheel E projects, so that the valve may be'lifted from its seat at will by turning the hand-wheel.
In use when the end of the cylinder is filled with live steam it passes'throu'gh port afin on top of flange band into cup 19 and the area thereof being much greater than that upon the under side of said flange'holds the main valve firmly to its seat. When the steam has been exhausted, should there-be anywaterof condensation left in the end of the cylinder the piston car'riesjit into casing A, and as the water rise's therein it comes in contact with the under side of fiangebbefore it reaches port afl raises the main valve 01f of its seat; and carries up flange b, thereby covering port aflpreventing water enteringabove the flange, "so that the valve remains thrown from its seat to allow the water to escape past secondary valve 0, which had been held up to its seat with a pressure just sufficientto counteract its weight. The purpose of valve 0 is to prevent outside air from raising valve B and get- .ting into the casing when steam isexhausting from the cylinder.
In the modification shown in Figs. 5 to 9 casing A has an upper externally. screwthreaded extension at", which is to be screwed into a steam-cylinder, and a lower-internallyscrew-threaded extension at, which receives a coupling F, the upper end of which forms valve-seat) of main valvefi and the lower end of which is to be connected to an exhaustpipe. Connected to theinner walls of easing A by arms a is an inverted cup a near the lower edge of which is a slot a". Main valve G consists of a cylindrical shell having an enlargement g at its top to fit snugly within cup a so that when the valve is seated its upper edge comes below slot a and leaves it unobstructed. Main valve G has near its lower end an internal annular flange g, which forms the seat for a secondary valve H, which consists of an inverted cup having an upwardlyprojecting stem h, which passes up through a perforation in top of cupa. Valve 11 has wings 72" upon its sides which contact the walls of main valve G, and through its upper end passes a pin 7L2, which projects into enlargement g to limit the upper travel of valve l'I. Between wings h and collar g is a coiled spring W.
In use upon the live-steam end of the cyl' inder the steam enters through slot a in upon top main valve G and secondary valve H, carrying the latter toits seat. Upon the exhaust side spring h lifts valve H from its seat. Any water ofcondensation coming with pressure against the under side of enlargement g raises the main valve, closing slot at to prevent any pressure coming on top of the valve, and allows the water to be discharged from the casing. Should the water accumulate in small quantities in the valve-casing, so thatit exercises no pressure against the under side of enlargement g, and if valve H were not held open by spring 72,3 to allow the water that gets in' on top of it to escape, this water would upon a large quantity of water coming into the valve under pressure prevent the valve from opening. springh however, opens valve II upon the exhaust end of the cylinder and allows the water that has accumulated to escape, thus keeping the valve in working condition for action should a large quantity enter the valve under pressure.
Vhat I claim is 1. In a relief-valve a casing having an inlet and an outlet opening, a main valve therein normally closing the outlet-opening having an enlarged upper end contacting the walls of the casing and forming therewith a closed chamber above the valve, said chamber having a slot in its Walls situated above the normal position of the upper end of the valve and placing the chamber in communication with the interior of the casing, substantially as shown and described.
2. In a relief-valve a casing having an inlet and an outlet opening, a main valve therein normally closing the outlet-opening having an enlarged upper end contacting the walls of the casing and forming therewith a closed chamber above the valve, said chamv her having a slot in its walls situated above the normal position of the upper end of the valve and placing the chamber in communication with the interior of the casing, and a handwheel having its stem passing through the casing and engaging the main valve for lifting it from its seat when desired, substantially as shown and described.
3. In a relief-valve the combination of a casing having an inlet and an outlet opening, a main valve therein seated against the outlet-opening and consisting of 'a shell having an internal flange and an upper enlarged end contacting the walls of the casing and fortning therewith a closed chamberabove the valve, said chamber having a slot in its walls situated above the normal position of the end of the valve and placing the chamber in communication with the interior of the casing, a
secondary valve to be seated downward