US1790353A

US1790353A - Valve structure

Info

Publication number: US1790353A
Authority: US
Publication date: 1931-01-27
Anticipated expiration: 1948-01-27

Description

Jan. 27, 1931 R. E. Q WEI L 1,790,353

vAL vE sTRucTuim Filed Dec. 2, 1927 Patented Ja 27,1931

- UNITE-D sTArEs PATEIJT 6mm 2.03am E. nnwnLL, or rawm, rnmrsnvam' vALva sratc'rnnm Application Med December .2, 1927. Serial No. 937,170

an auxiliary supply of gas for a ilot flame,

1o which will burn continuously or ill ignite gas from the main supply each time such main supply is turned on as by a thermostatically-controlled valve. In such devices there is commonly no means for automatically controlling the supply of gasfor the pilot flame nor. for automatically shutting off the main flow of gas in case the pilot flame should become extinguished. To rovide a pilot flame, it'is usual to en p y a small by-pass for gas from the supply ine to the burner, and, due 'to the verysmall size of the orifice required, such b -pass freqllliently becomes clogged, particu arly where v t egascontains foreign matter. One object of my invention is to provide means for automatically shutting off the supply of all gasto the burner in case the flame o'r pilot becomes extinguished.

Another object of 'my invention is to provide means for automatically controlling the supply of gas to the pilot flame, so that such flame maybe maintained at a predetermined volume.

Another object of my invention is to provide an improved form of thermostat element that-will not oxidize or. deteriorate in the intense heat of the bu'rner'flame.

Still another object of my invention is'to simplify and improve generally the structure 4 and operation of fluid fuel burner devices.

One form which my invention may take .is shown in the accompanying drawing, wherein Figure 1 is an elevational view of heating apparatusequipped with my invention; Fig.

2 is a sectional view, on an enlarged scale,

of one of the control valves of Flg. 1, and

Fig. 3 is a perspectiveiview of the protecting sleeve, for the thermal element of Fi 2. v

The invention is shown as employe in connection with a domestic water heater struc- V the valve 17, and through the outlet 14. A

.ture comprising a storage tank l, heating coils 5, a burner 6, anda thermostaticallycontrolled valve 7 for normally controlling the main flow of gas to the burner in accordl,

ance with the temperature of the water withinthe tank 4. These parts may be of various well-known forms. P

My invention resides more especially in theQprovision of an auxiliary valve control device whereby a supply of gas for a pilot e0 flame is automatically-maintained at a predetermined rate, and whereby the gas, both theauxiliary supply for the pilot flame and the main supply, are automatically cut off in casethe flames become extinguished. The control apparatus above referred to includes .a valve casing -8 having valve seats 9 and 10,

with a space or ,chamber'between' them, and cover plates or castings 11, and 12. The casin 8-is provided with an inlet 13 through whic the main gas supply enters from the thermostatically-controlled valve 7, and with an outlet 141that communicates with the burner 6.

A cover plate 11 is provided with an inlet 15, I through which gas for the pilot flame may flow from a supply line 15a that has connec- K tion with the main supplyline 7a in advance 7 of the thermostat 7.

lalve

discs

16 and 17 co-operate with the sea s 9 and 10 respectively. The valve disc- 16 is loosely connected to a stem 18, which stem is slidably supported in a boss 19 of the Y valve casing 8; The outer end of the'stem 18 loosely engages with the valve 17. A spring 20 urges the valve 16 to its seat and, acting through the stemf18,,urges the valve 17 from its seat. Normally, the valve'16 will be closed and gas for the burner 6 will flow from the primary valve 7, through the inlet 13, past 'within the tube 21, its outer end abutting against a screw plug 23 that is carried, by the tube 21, and its inner end extending into a recess in the valve 17. Should the burner flame be extinguished, it will be seen that the tube 21 will cool and shrink, thus drawing the rod 22 inwardly and pushing the valve 17 to its seat, thereby shutting off entirely the flow of gas to the burner.

In cases where the main supply of gas from the valve 17 is reducedbelow the predetermined volume for the pilot flame, the temperature of the thermostattube 21 will, of

course, be reduced, causing it to contract to such an extent as to move the valve 16 from its seat, thereby admitting suflicient gas past the

valves

16 and 17 to maintain a normal pilot flame. Should the flame in the burner 6 become completely extinguished, the tube 21 will shrink to such extent as to completely close the valve 17, shutting off flow of gas both from the primary valve 7 and the pilot control valve 16. In order to again establish flow of gas to the burner, a lighted match will first be applied to the tube 21, causing it to quickly expand and allow the valve 17 to open under pressure of the spring 20, for the passage of gas which will be ignited by the match;

A snug-fitting sleeve 25 is provided around the tube 21, for the purpose of sealing it off from the air and consequently preventing oxidization thereof, through contact with the burner flame. This sleeve may be of chromium steel, which will resist oxidization say up to 2000 F., or may be of various other suitable materials. The sleeve is thin enough to readily transmit heat to the copper tube, and may be removed and re laced by taking off the cap 23 and sliding t e sleeve off the tube 21, if the cap 23- is of considerably greater diameter than the tube. However, if the cap is of small diameter, as shown in Fig. 2, the sleeve 25 can be slid off without disturbing the cap and, consequently, the setting of the thermostat-that is without disturbing the relative positions of the tube 21 and the rod 22, with consequent variation in adjustment of the valves 16 and L7 relative to the tube 21. Due to its relatively low coeflicient of expansion, it is split its entire length to spring or yield so it will not bind on the tube 21 and prevent the normal expansion or contraction thereof.

If the thermostat 7 is asnap-actingor quick-acting one, which suddenly shuts off all gas to' the main burner flame, it will be necessary to use an independent pilot burner which remains lighted, and to place the element 22 within a zone afl'ectedby the pilot flame but little aflected by the main burner Otherwise, the sudden extinguishing of the main burner wouldca-use the pilot to go out also, as .the element 22 would not have time to cool sufliciently to open the valve disc 16.

I claim as my invention:

1. The combination with a fuel burner, of means for controlling supply of fuel thereto, comprising a valve casing having a main inlet, an auxiliary inlet and an outlet, a main valve controlling flow from the main inlet to said outlet, an auxiliary valve for controlling flow from the auxiliary inlet past the a pilot flame, a thermostatic device acted upon by the burner flame, and means effective upon movement of said thermostatic devlce in one direction for impartmg openlng movement to the auxiliary valve and effective upon further movement of said device to effect closure of the main valve.

3. The combination with a fuel burner, of a main source of fuel supply therefor, an auxiliary source of fuel supply for a pilot flame, and thermostatic means acted upon by the burner flame and operable upon movement in one direction for admitting fuel from the auxiliary source and upon further movement 1n said direction to shut off the supply of fuel from both of said sources.

4. The combination with a fuel gurner, of a main source of fuel supply therefor, an auxiliary source of fuel supply for a pilot flame, and thermostatic means acted upon by the burner flame and operable upon move ment in one direction for admitting fuel from the auxiliary source and u on further movement in said direction to s ut off the supply of fuel from both of said sources, thesaid thermostatic device when in its 0 posite extreme position serving to permit ow of fuel from said main source, to the exclusion of the flow of fuel from the auxiliary source.

, 5. The combination with water heater structure comprising a fuel burner, a water receptacle, a thermostat controlling a main supply of fuel to the burner in accordance with the temperatureof the water, and a pilot supply line independent of the thermostat control, of an additional thermostat device actuated directly'by temperature changes in the zone of the burner for controlling flow through said line and for shutting off the said main flow of fuel tothe burner in the sequence named.

6. The combination with a. fuel burner, of a main source of fuel supply therefor, an auxiliary source of fuel supply for a pilot flame,

and thermostatic means actuated directly by temperature changes in the zone of the burner and o erable u on movement in one direction for a itting uel from the auxiliar source andupon further movement in said irection to shut ofl' the supply of fuel from both of said'sources.

In testimony whereof I, the said ROBERT v E. NEWELL, have hereunto set my hand. 0 I ROBERTE. NEWELL.