US2593701A

US2593701A - Antiscald and proportioning valve

Info

Publication number: US2593701A
Application number: US56403A
Authority: US
Inventors: Paul W Sanford
Original assignee: BODY GUARD VALVE CO Inc; Shepherd Machine & Tool Co Inc
Current assignee: BODY GUARD VALVE CO Inc; BODY GUARD-VALVE Co Inc; Shepherd Machine & Tool Co Inc
Priority date: 1948-10-25
Filing date: 1948-10-25
Publication date: 1952-04-22
Anticipated expiration: 1969-04-22

Description

April 22, 1952 P. W. SANFORD ANTISCALD AND PROPORTIONING VALVE Filed Oct. 25,

1 PI.Z

IN VEN TOR.

Patented Apr. 22, 1952 UNETED STATES ENT @FHCE one-half to Shepherd Machine a Tool Co., Inc., indianapolis, Ind., both corporations Application cameras, ieisfseriai No. 55.4.03

This invention relates to a valve unit capable of multiple functioning'.

The chief object of the present invention is to provide a valve unit that is' capable of functioning as an anti-scald valve and which may be utilized -for common' orr independent discharges.

One chief feature of the inventionl resides in its simplicity of construction.,

Another chief feature residesI in: the specific piston type: memberA utilized.V A thirdfchierfeature resides in the partition plug' utilized when independent discharges'v are being illustrated in the cold Water supply position.

Fig. 2' is a side elevation of the valve unit, the. supply and dischargev lines being omitted.

Fig.. 3 is a bottom plan view; the supply lines being omitted.

Figs. 4, 5 and 6 are longitudinal sectional'. views of modiiied forms of pistorrvalve'.

Fig. '7 is a perspective view of the partition plug.

Fig. 8 is a perspective View of the clean-out plug.

Fig. 9 isa view takenv on line S-Si of Fig. l and in the direction of the arrows and with the separation plug removed.

In Fig. 1, H and C designate hot and cold Water supply lines and HH and CC' hot and'coldI water discharge lines. lil indicates generally a valve body having intake ports i l and i2' and discharge ports I3 and iii.

In proximity to portions l la and E201, and cornmunicating therewith is a transverse intake 'bore I5 opening at I6 and adapted to receive cut-off and clean-out plug Il, see Figs'. l and 8, having threaded end I8 and two spaced, transversely disposed passages i9 and 20 therethrough.

The body, opposite portions Ila and IZa, has ports 2| and 22 aligned with said portions. A cylinder bore 23 has one end exposed at 2A and slidably supported therein is piston valve 25, the latter retained by' clean-out plugV 26. e

vportion 38'.

The cylinder bore 23S is disposed parallel to bore it. Parallel thereto is discharge bore 2l opening outwardly' at 223y to take, clean-out and closure plug 29. A pair of tangentially disposed ports 2id are directed from the cylindrical bore toward thev center of the receiving borey El. A similarly disposed pair of ports 3E are cppositely directed and* the body stock therebetween is circularly counterbored, as at 3i, seev Figs,v land 9.

` he body, in alignment with ports and iii, includes portions i3d and lariF which communicate-,with reoeiverborei'. Between ports l.. and idis` the threaded opening 3.2i adapted to take the separator plug 33, see Figs. 1 land '7, saineV having stem Bil and vane termination When this plug is positioned as, shown inv Fig.V l the hot and cold water sides are independent. When the vane is disposed at right angles to that position,v the width thereof is not sufficient to bridge. the gap across the respective pairs oi` ports 27am-2a and Sile-3E and also said vane is not long enough. Consequently, when the plug is thus positioned, bore 2l comprises a mixing chamber.

When cleaning, repair, or replacement is' required shut oil? plug ll may be turned: or so Yand both supplies H and C are cut oli for such service. y

Reference will nowl be had to the piston valve shown in Fig. 1 and several modifications thereof "shovfninFigsL ll, 5, and 6.

ln Fig. 1 the piston valve 25 includes two. cp'- positely directed, axially aligned elongated chambers 3d'. and 3l separated by the central partition Each chamber opens at' the other end', and vdefining such opening is the lip 35e andr 31a'.

l-Iereinv the piston includes a plurality of spaced annular channels 38 and Sb and 39a' and 391 providing end collars 0 and d I, intermediate collars 2 and 43 and central collar Ml. Connectinsr vchannel 38a with chamber 3S are the ports 5.

Channel 38h' connects therewith by ports 4B. Chamber 3i communicates with channel 393 by ports ill and with channel 3W by ports t3.

In Fig. l the lands aforesaid have av` common diameter slightly less than. the cylinder bore. In Fig. 4' numerals or the one hundred series designate like or corresponding parts. This form 'only differs from Fig. l by thev land la@ being longitudinally ported as at e, the land |42 as at i423, the land Ml as at Ulla, and the land |43 as at 443e. Central land HM is not so ported.

in Fig. 5 the corresponding parts are designatedf by numerals of the two hundred series.

Herein, likeFig. l, the. lands are; not'porteda 11'1- certain pistons certain of the piston ports mayv be omitted. Special operating. conditions. will determine which specic form of piston is to be preferred over the others, although all forms are functionally operative.

The structure hereinbefore described is extremely sensitive and by way of example only results of one piston embodiment, 4tested at the Pittsburgh testing laboratory, (shows lthe followlng:

With the cold water supply at 6'7 degrees un- .der 70 pounds per square inch and the hot water supply at 142 degrees under the same pressure,

the respective pressures were at 59% and 601/2 pounds'per square inch, with the desired water blendzat 100 degrees. When the cold water supply-was robbed by draw-off to the extent,l of 49H2 pounds per square inch, the 100 degree temperature was still maintained. When due to loss of temperature in the hot water supply yof one de- .gree and excessive draw-off again sustained, the

resulting blend temperature was. 991A` to 100 degrees. Thus only a diference, over the entire "range, of approximately 1/2 degree occurred.. The

closest commercial structure known, when tested under identical conditions, has a range of 14 degrees of variation. The present valve, accordingly, may be said to be peculiarly applicable to .maintain as long as supply temperatures are maintained, a constant predetermined blend temperature, regardless of cold water draw-01T or robbing.

'I'he foregoing data relates to the Fig. l piston in a cvlinder of .625 diameter with a clearance of .003". Pistons similar thereto,v but having clearances-of .001" Jand .005", Were also, tested .and maximum temperature differenceswere 1% degrees for all pistons. the hof. water supply temperatures, in these higher diiTerences, dropping as much as 2% to 3 degrees'.

These tests demonstrated that the tight piston was too sluggish, relatively speaking, and loosest piston performed excellently. The' intermediate side piston 'functioned within one-half degree even though the hot water supply temperature dropped 1 degree. Without supply temperature udrop, the blend temperature was maintained.

Accordingly, the intermediate piston, if it should wear in use to the size of the loosest piston, will still perform far better than any other known `anti-scald valvez structure.

If it be assumed that the supplies C and H are subject to line pressure, cut-01T valve l'!k can cut vsame off for cleaning, repairing, and/or replacedegrees thereto. Whatever valve setting is provided, the piston valve, regardless of cold water draw-o will maintain the predetermined blend temperature. 5 Of course, if desired, a single common discharge line may be applied to opening 32 and openings I3 and I4 plugged for single line discharge. of a wide variety of uses.

The fundamental characteristic of the piston valve, see Fig. 1, and its operation is that all the water passed to discharge passes through the valve and the valve is of the automatic proportioning type for blend constant temperature l5 maintenance. The vanesA utilized are provided for greater sensitivity.

The piston is arranged so that the high pressure will closetoward the low pressure side at theY same time thereby maintaining the predetermined proportion.

In Fig. 1 high pressure in supply H and no pressure in cold water supply C results in the piston valve moving to the left to the position shown. This prevents accidental scalding. Upon 25 cold water draw-01T cessation or when the pressure in line C builds up, the same proportionally moves the piston valve to the right, thus opening the hot water supply to the desired degree to correspondwith thecold Water supply for the desired blend. Thus, the piston valve, in a system such as a hotel with many toilets and baths, maintains at each shower thev desired temperature Jwhen the cold water line is excessively used.

The preferred form Fig. 1 piston is of a character wherein all the Water discharged from the valve unit must pass through the central bores of the piston. This accounts for the sensitivity of this form. In the others, Figs. 4 to 6, a small proportion does not necessarily have t0 pass 40 through the central bores of the piston, hence their sensitivity is not as great.

While the invention hasv been illustrated and described in great detail in the drawings and lforegoing description, the same is to be' considered as illustrative and not restrictive in character.

The several modincations described herein, as Well as others which will readily suggest themselves to persons skilled in this art, all are considered to be within the broad scope of the invention, reference being had yto the appended claims.

The inventionr claimed is:

l. A valve unit comprising a valve body having a discharge bore, an intermediate bore and an intake borey the axes of said bores being parallel; `said discharge lbore having spaced apart ports connecting Ywith said intermediate bore and having discharge ports; said intake bore having intake ports and discharge ports communicating with said intermediate bore; a piston-like control valve slideably mounted in said intermediate bore having an axial centralbore divided by an intermediate Wall to provide two separate passages each open at one end, each of said passages having an intake port adapted for communication with an intake port of said intermediate bore, and an outlet port adapted for communication with afdischarge port of said intermediate bore and Valve lands at the opposite ends of said control valve for controlling the discharge through the discharge ports of said intake bore into said intermediate bore. i

2. A valve unit comprising a valve body having a discharge bore, an intermediate bore and an This valve unit, therefore, is capable' intake bore, the axes of said bores being parallel; said discharge bore having spaced apart ports connecting with said intermediate bore and having discharge openings; said intake bore having intake ports and discharge ports communicating with said intermediate bore; a piston-like control valve slideably mounted in said intermediate bore having a central axial bore divided by an intermediate wall to provide two separate passages, each open at one end; each of said passages having an intake port adapted for communication with the intake ports of said intermediate bore, and an outlet port adapted for communication with a discharge port of said intermediate bore; valve lands at the opposite ends of said control valve for controlling the discharge through the discharge ports of said intake bore into said intermediate bore, and an intermediate land on said control valve dividing said intermediate bore into separate chambers.

3. A valve unit comprising a valve body having a discharge bore, an intermediate bore and an intake bore, the axes of said bores being parallel; said discharge bore having spaced apart ports connecting with said intermediate bore and `having discharge openings; said intake bore having intake ports and dicharge .ports connecting with said intermediate bore; a piston-like control valve slideably mounted in said intermediate bore having an axial central bore divided by an intermediate wall to provide '.two separate passages, each open at one end, each of said passages having an intake port adapted for communication with the intake ports of said intermediate bore; an outlet port adapted for communication with a discharge port of said intermediate bore; valve lands at the opposite ends of said control valve controlling the discharge through the discharge ports of said intake bore into said intermediate bore; and a cutoff valve in said discharge bore movable to separate the intake ports extending from said intermediate bore to said discharge bore.

4. A valve unit comprising a valve body having a discharge bore, an intermediate bore and an intake bore, the axes of said bores being parallel; said discharge bore having spaced apart ports connecting with said intermediate bore and having discharge ports, said intake bore having intake ports and discharge ports communieating with said intermediate bore; a pistonlike control valve slideably mounted in said intermediate bore having an axial central bore divided by an intermediate wall to provide two separate passages, each open at one end; each of said passages having an intake port adapted for communication with an intake port of said intermediate bore, and an outlet port adapted for communication with a discharge port of said intermediate bore; valve lands at the opposite ends of said control valve for controlling the discharge through the discharge ports of said intake bore into the intermediate bore, and a cutoff valve in said intake bore for cutting off communication between the intake ports in said bore and the discharge ports in said bore.

5. A valve unit comprising a valve body having a discharge bore, an intermediate bore and an intake bore, the axes of said bores being parallel; said discharge bore having spaced apart ports connecting with said intermediate bore and having discharge ports; said intake bore having intake ports and discharge ports communicating with said intermediate bore; a pistonlike control valve slideably mounted in said intermediate bore having an axial central bore divided by an intermediate wall to provide two separate passages, each open at one end; each of said passages having an intake port adapted for communication with an intake port of said intermediate bore; an outlet port adapted for communication with a discharge port of said intermediate bore; valve lands at the opposite ends of said control valve for controlling the discharge to the discharge port of said intake bore into the intermediate bore; a piston land on said control valve intermediate of its ends dividing said intermediate bore into separate chambers; and secondary piston lands interposed between said intermediate piston land, and said valve lands on said valve member.

PAUL W. SANFORD.

REFERENCES CITED The following references are of record in the iile oi this patent:

UNITED STATES PATENTS Number Name Date 962,111 Assmann June 21, 1910 1,799,266 Wallace Apr. 7, 1931 1,807,040 Leonard May 26, 1931 2,308,127 Symmons Jan. 12, 1943 2,417,158 Fraser Mar. 11, 1947 2,443,499 Fraser June 15, 1948 2,470,025 Fraser May 10, 1949,