Gas valve

A gas valve device includes a pressure regulator and two solenoid operated valves connected fluidically in series. The valve body therein is selectively cored and machined so as to provide a gas valve device which is compact in physical size, inexpensive to produce, and versatile in that it provides a choice of several gas outlet directions.

BACKGROUND OF THE INVENTION 
This invention relates to gas valves, and particularly to an improved 
construction thereof which results in a compact and versatile device. 
Gas valves comprising a pressure regulator and two solenoid operated 
valves, all connected fluidically in series with a burner, have been known 
for many years. Such valves, in conjunction with externally connected 
electrical circuitry, are utilized to control gas flow to various 
gas-fired appliances, such as clothes dryers. 
SUMMARY OF THE INVENTION 
An object of this invention is to provide a generally new and improved gas 
valve comprising a pressure regulator and two solenoid operated valves 
which is compact in physical size, versatile in providing a choice of 
several gas outlet directions, and relatively inexpensive to produce. 
A further object is to provide a compact gas valve comprising a pressure 
regulator and two solenoid operated valves wherein the metal casting for 
the valve body is cored in such a manner that a minimal amount of 
machining is required to provide a desired gas outlet direction. 
The above-mentioned and other objects and features of the present invention 
will become apparent from the following description when read in 
conjunction with the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1, the gas valve of this invention includes a pressure 
regulator indicated generally at 10 and two solenoid operated valves 
indicated generally at 12 and 14 positioned in a single valve body 
indicated generally at 16. A cover plate 18 is attached to valve body 16 
by a plurality of tamper-proof screws 20 and by a special screw 22 
threaded on one end for attaching cover plate 18 to valve body 16 and on 
its other end for frictionally mounting a cable clamp 24. Clamp 24 is 
provided for retaining a plurality of electrical leads including a pair of 
leads 26 and 28 connected to solenoid operated valve 14 and three leads 
30, 32 and 34 connected to solenoid operated valve 12. 
Gas flows into valve body 16 via a gas inlet conduit 36 and exits valve 
body 16 through an orifice screw 38 threadedly engaged in an outlet boss 
40 of valve body 16. Threadedly engaged in another outlet boss 42 of valve 
body 16 is a conventional pressure tap fitting 44. A third outlet boss 46 
is provided in valve body 16 for reasons hereinafter described. 
Attached to one of a plurality of threaded apertures 47 in valve body 16 by 
a screw 48 is a U-shaped bracket 50 which functions as a portion of the 
magnetic path for solenoid operated valves 12 and 14. Referring to FIGS. 
1, 2, and 3, a bottom leg 52 of bracket 50 is provided with an aperture 
54, in alignment with an aperture 55 in cover plate 18, through which 
screw 48 extends for attachment of bracket 50 to valve body 16. A top leg 
56 of bracket 50 is provided with two apertures 58 and 60 through which 
portions of valves 12 and 14, respectively, extend. A vertical slot 61 
extends from top leg 56 to bottom leg 52 to enable access to screw 48. Top 
leg 56 is also provided with an aperture 62 through which a projecting 
boss 64 of a portion of valve 12 extends. The cooperation of aperture 62 
in top leg 56 and projecting boss 64 of a portion of valve 12 ensures 
that, should one or more of the windings of valves 12 and 14 be replaced, 
bracket 50 can only be attached if the correct windings are on valves 12 
and 14. 
Referring now to FIG. 2, valve body 16 is provided with a threaded and 
stepped opening 66 for receiving inlet conduit 36. A small-mesh screen 68 
is located against a shoulder 70 in opening 66 downstream of inlet conduit 
36 for trapping any foreign particles, such as dirt or metal chips, that 
may be present in the gas stream. Contiguous with opening 66 is a chamber 
72, one end of which is provided with a ledge 73 to which a valve seat 74 
is attached. 
Pressure regulator 10 is effective to control the rate of gas flow out of 
chamber 72. Regulator 10 includes a poppet valve 76 cooperative with valve 
seat 74 and connected by a valve stem 78 to a flexible diaphragm 80. 
A peripheral portion of diaphragm 80 is located in a groove 81 of valve 
body 16 and is sandwiched between valve body 16 and cover plate 18. 
Diaphragm 80 forms a flexible wall between an upper chamber 82 and a lower 
chamber 84 of regulator 10. Lower chamber 84 is defined by diaphragm 80 
and a recess formed in valve body 16, the recess having a bottom wall 86 
and a side wall 88 having a passageway 90, shown in FIG. 4, through which 
gas flows to the burner (not shown) when solenoid operated valves 12 and 
14 are energized, as will be hereinafter described. 
The upper chamber 82 of regulator 10 is defined by diaphragm 80 and a 
recess formed by a cup-shaped portion 92 of cover plate 18, an 
internally-threaded sleeve 94, a spring-adjusting screw 96, and a 
fixed-orifice screw 98. Sleeve 94 is staked to cup-shaped portion 92 of 
cover plate 18 at a centrally located aperture 99 therein. Screw 98 is 
threadedly attached to the interior of sleeve 94 and is provided with a 
small-diameter opening 100 to cause upper chamber 82 to be exposed to 
atmospheric pressure. Screw 96 is threadedly attached to the interior of 
sleeve 94 and enables adjustment of a spring 102 which biases diaphragm 80 
downwardly. A relatively rigid disc 104 is centrally positioned and 
attached to diaphragm 80. Disc 104 aids in securing valve stem 78 to 
diaphragm 80, provides a rigid nesting surface for one end of spring 102, 
and imparts rigidity to diaphragm 80. 
Valve body 16 in lower chamber 84 is provided with three 
peripherally-shaped bosses 106 projecting upwardly from bottom wall 86. 
These bosses 106 limit downward movement of diaphragm 80 so as to ensure 
that diaphragm 80 will not restrict or throttle the gas flow past valve 
seat 74 when gas pressure is relatively low. The underside of diaphragm 80 
is provided with three projections 108 which are vertically aligned with 
boses 106. These projections 108, which further limit downward movement of 
diaphragm 80, also prevent damage to the relatively thin diaphragm 80 that 
could otherwise occur due to vibration when diaphragm 80 and bosses 106 
are normally in contact, such as during shipment. 
Referring now to FIG. 4, passageway 90 is contiguous with a chamber 110 
formed as a recess in valve body 16. A bottom wall 112 of chamber 110 is 
provided with a passageway 114 having a valve seat 116 formed at the 
entrance thereof. A valve 118 of solenoid operated valve 12 cooperates 
with valve seat 116 to control the flow of gas between chamber 110 and 
passageway 114. When valve 118 is open, gas flows through passageway 114 
into a passageway 120. Pressure tap fitting 44 is attached to a threaded 
opening 122 in one end of passageway 120. The other end of passageway 120 
leads into a chamber 124. 
Chamber 124 is also formed as a recess in valve body 16. A bottom wall 126 
of chamber 124 is provided with a recessed opening 128 for reasons 
hereinafter described. The bottom wall 126 is also provided with a 
passageway 130 having a valve seat 132 formed at the entrance thereof. 
Solenoid operated valve 14 includes a valve 134 which cooperates with 
valve seat 132 to control the flow of gas between chamber 124 and 
passageway 130. When valve 134 is open, gas flows through passageway 130, 
a passageway 136, and through a small-diameter opening 138 in orifice 
screw 38 which is secured in a threaded opening 139. 
Thus, when solenoid operated valves 12 and 14 are energized, gas flows from 
inlet conduit 36 through opening 66, chamber 72, past regulator valve 76 
and its seat 74, into valve chamber 88, through passageway 90, chamber 
110, passageways 114 and 120, chamber 124, passageways 130 and 136, and 
opening 138 in orifice screw 38 to the burner. Under normal inlet gas 
pressure, regulator valve 76 is biased downwardly, in reference to FIG. 2, 
to permit the desired rate of gas flow at the burner. If the inlet 
pressure increases, the increased pressure acts against regulator 
diaphragm 80 so as to move valve 76 upwardly. The resulting smaller 
opening between valve 76 and its seat 74 acts to maintain essentially the 
same rate of gas flow at the burner. If the inlet pressure decreases, 
diaphragm 80 and poppet valve 76 are forced downwardly by spring 102. The 
resulting larger opening between valve 76 and its seat 74 acts to again 
maintain essentially the same rate of gas flow at the burner. 
Referring to solenoid operated valve 12 in FIG. 4, chamber 110 in valve 
body 16 is covered by a cup-shaped portion 140 of cover plate 18. Located 
in a groove 142 of valve body 16 and sandwiched between valve body 16 and 
cover plate 18 is a gas-sealing, compressible ring 144. Preferrably, 
groove 142 is contiguous with groove 81, which retains diaphragm 80, and 
ring 144 is integral with diaphragm 80. 
Cup-shaped portion 140 of cover plate 18, which is constructed of magnetic 
material, is provided with a centrally positioned aperture 146 through 
which a lower open end of a non-magnetic plunger guide sleeve 148 extends. 
Guide sleeve 148 is provided with a peripheral bead 150 near its open end. 
Sandwiched between bead 150 and the underside of cup-shaped portion 140 of 
cover plate 18 is a compressible O-ring 152. A cup-shaped retainer 154 
includes an outwardly-extending upper flange 156, which is spot-welded to 
the underside of cup-shaped portion 140 of cover plate 18, and an 
inwardly-extending lower flange 158. The vertical distance between flanges 
156 and 158 of retainer 154 is somewhat less than the combined thickness 
of bead 150 and O-ring 152 in its uncompressed state so that when retainer 
154 is spot-welded to cup-shaped portion 140, O-ring 152 is compressed so 
as to provide a gas seal with cup-shaped portion 140 and guide sleeve 148. 
The upper end of guide sleeve 148 is closed and extends through aperture 58 
in top leg 56 of bracket 50. Sleeve 148 is provided with a peripheral 
groove 160 which retains a stop member generally indicated at 162. Stop 
member 162 comprises an outer ring 164 of magnetic material, an inner 
shade ring 166 of copper, and a central plug 168 of magnetic material. 
Central plug 168 has a generally hemispherical head 170 flattened somewhat 
at its lowest portion. 
Mounted in guide sleeve 148 for free sliding movement is a plunger 172 of 
magnetic material. The upper end of plunger 172 is provided with a conical 
recess 174 which cooperates with head 170 of central plug 168 to center 
the upper end of plunger 172 in guide sleeve 148. The lower end of plunger 
172 extends beyond the open end of guide sleeve 148 and carries valve 118. 
The lower end of guide sleeve 148 is flared outwardly a small amount to 
ensure free sliding movement of plunger 172. 
A return spring 176 bears at its upper end against upper flange 156 of 
retainer 154. The lower end of spring 176 is nested in a peripheral groove 
178 in plunger 172. Spring 176 urges plunger 172 downwardly so as to 
normally bias valve 118 on its seat 116. Spring 176 is preferrably of the 
form having an eccentric coil at one end as shown in U.S. Pat. No. 
2,650,617. This form of spring biases the lower end of plunger 172 against 
one side of guide sleeve 148 so as to reduce chattering of plunger 172 
when in an energized position. 
Surrounding non-magnetic sleeve 148 and extending upwardly from cup-shaped 
portion 140 of cover plate 18 to a point slightly below stop member 162 is 
a sleeve 180 of a material whose magnetic characteristics vary with 
temperature. Slipped over sleeve 180 and resting on portion 140 of cover 
plate 18 is a bobbin 182 on which two electrical windings 184 and 186 are 
wound. Windings 184 and 186 are peripherally encapsulated by any suitable 
potting material 188. 
The provision of two windings on a single bobbin, as well as the provision 
of a temperature-compensating sleeve, are well known in the art. Briefly, 
the magnetic flux path extends through cover plate 18, bracket 50, stop 
member 162, and plunger 172. Both windings 184 and 186 must be energized 
to generate sufficient flux to lift plunger 172 and open valve 118. Once 
valve 118 is open, the current in winding 186 is reduced by external 
electrical circuitry (not shown) to a value which, in conjunction with 
winding 184, will keep valve 118 open. Sleeve 180, which provides a flux 
path parallel with plunger 172, exhibits a high magnetic permeability at 
low temperatures and a low permeability at high temperatures. For example, 
at high temperatures, the resistance of the copper wire in windings 184 
and 186 increases, reducing the ampere-turns thereof. Sleeve 180, however, 
exhibits a lower permeability, allowing less of the available flux to flow 
through sleeve 180 and more through plunger 172. In this manner, sleeve 
180 is effective to enable valve 118 to be opened at essentially the same 
voltage, regardless of temperature. 
Solenoid operated valve 14 is constructed basically the same as valve 12 
except valve 14 has a single winding and does not include a 
temperature-compensating sleeve. 
Referring to valve 14 in FIG. 4, chamber 124 in valve body 16 is covered by 
a cup-shaped portion 190 of cover plate 18. A plunger guide sleeve 192 
extends through a central aperture 194 in portion 190. Guide sleeve 192 is 
provided with a peripheral bead 196 near its slightly-flared open end. A 
gas-sealing O-ring 198 is sandwiched between bead 196 and portion 190 and 
secured therein by a cup-shaped retainer 200. 
The closed upper end of guide sleeve 192 extends through aperture 60 in top 
leg 56 of bracket 50. Sleeve 192 is provided with a peripheral groove 202 
which retains a stop member 204 comprising an outer ring 206, an inner 
shade ring 208, and a central plug 210 having a head 212. 
Mounted in guide sleeve 192 is a plunger 214, the upper end of which has a 
conical recess 216 which cooperates with head 212 of central plug 210, and 
the lower end of which carries valve 134. A return spring 218 biases 
plunger 214 downwardly so as to normally bias valve 134 on its seat 132. 
Slipped over guide sleeve 192 is a bobbin 220 on which is wound an 
electrical winding 222. Winding 222 is encapsulated by any suitable 
potting material 224. 
Should it become necessary to replace winding 222 and/or combined windings 
184 and 186, replacement is simple and safe. Specifically, to replace a 
defective winding, screw 48 is removed, permitting bracket 50 to be 
removed. The encapsulated bobbin containing the defective winding is then 
lifted from its guide sleeve and the appropriate new encapsulated bobbin 
containing the new winding or windings is placed on the proper guide 
sleeve. Bracket 50 is then positioned to cause guide sleeve 148 and 192 to 
extend through apertures 58 and 60, respectively. It should be noted that 
the resilient mounting of guide sleeves 148 and 192, due to utilization of 
O-rings 152 and 198, respectively, allows some lateral movement thereof 
without causing gas to leak from valve body 16. If the windings have been 
replaced correctly, the above positioning of bracket 50 will also cause 
projecting boss 64 of bobbin 182, shown in FIG. 2, to be aligned with 
aperture 62 in top leg 56 of bracket 50. Bracket 50 is then re-attached to 
valve body 16 by screw 48. 
FIGS. 5 and 6 are a top plan view and a cross-sectional view, respectively, 
of valve body 16. FIGS. 7 and 8 are similar views of a rough casting 300 
used to produce valve body 16. A particular feature of this invention, 
which will now be described, is that the amount of machining of casting 
300 to produce valve body 16 is minimal. 
Referring to FIG. 7, casting 300 is provided with outlet bosses 40, 42, and 
46. Casting 300 is also provided with chamber 72 and chamber 84, including 
bosses 106 which project upwardly from bottom wall 86 of chamber 84. 
Casting 300 is further provided with two peripherically-shaped bosses 302 
and 304, for a reason hereinafter described, which project upwardly from 
bottom wall 86 to chamber 84 and are contiguous with side wall 88 of 
chamber 84. 
Casting 300 is provided with chamber 110 and passageway 114. The bottom 
wall 112 of chamber 110 is provided with a valve seat portion 306. Casting 
300 is further provided with chamber 124, including recessed opening 128 
in bottom wall 126 of chamber 124. Also provided in casting 300 is 
passageway 130 and a valve seat portion 308. 
Casting 300 is provided with grooves 81 and 142 which, as previously 
described, are contiguous and accept the integral diaphragm 80 and ring 
144. Finally, casting 300 is provided with a cored inlet opening (not 
shown) and a plurality of small circular depressions 310 near the 
peripheral edges thereof. 
It should be noted that casting 300 is quite small, measuring approximately 
21/2 inches .times.33/8 inches .times.13/8 inches. Such a small casting, 
as compared to the larger size castings for know prior art valves 
incorporating the same functions, enables a larger number of cavities to 
be provided in a given size of die frame, thus resulting in a less 
expensive casting. 
To produce valve body 16 from rough casting 300, chamber 72 is machined to 
provide ledge 73 which retains valve seat 74. Passageway 90 is drilled 
through boss 302 and wall 88 so as to extend into chamber 110. It is noted 
that boss 302 provides a surface normal to the drilling angle so as to 
facilitate drilling passageway 90. Such boss construction is more clearly 
shown for boss 304 in FIG. 11. Valve seat portions 306 and 308 are 
machined to provide valve seats 116 and 132, respectively. Depressions 310 
are drilled and tapped to provide threaded apertures 47 for accepting 
screws 20, 22, and 48. The cored inlet opening is threaded to accept inlet 
conduit 36. Boss 40 of casting 300 is drilled, tapped, and spot-faced to 
provide passageway 136 and threaded opening 139. Boss 42 is drilled and 
tapped to provide passageway 120 and threaded opening 122. 
As previously described in conjunction with FIG. 4, threaded opening 139 
receives orifice screw 38 and threaded opening 122 receives pressure tap 
fitting 44. Therefore, as shown partially at 226 in FIG. 6, the path of 
gas flow through valve body 16, when solenoid operated valves 12 and 14 
are energized, is through passageway 90, chamber 110, passageways 114 and 
120, chamber 124, passageways 130 and 136, and opening 138 in orifice 
screw 38 to the burner. It is to be noted that the spot-facing of boss 40 
allows for attachment, such as by staking, of a conventional orifice 
extension member (not shown) in lieu of attaching orifice screw 38 
directly to valve body 16. 
An additional feature of this invention, as will now be described, is that 
minor changes in coring of the rough valve body casting and minor changes 
in the machining thereof can produce a valve body with a different gas 
outlet direction. 
Referring to FIG. 10, shown therein is a rough casting 400, similar to 
casting 300 of FIG. 8, used to produce a valve body with a gas outlet at a 
boss 402, corresponding to boss 42 of casting 300, instead of at boss 404, 
corresponding to boss 40 of casting 300. As shown therein, casting 400 
includes a chamber 406 having a bottom wall 408. Bottom wall 408 is 
provided with a recessed opening 410. A passageway 412 extends downwardly 
from bottom wall 408, and a valve seat portion 414 is provided at the 
entrance of passageway 412. Casting 400 also includes a chamber 416 having 
a bottom wall 418. A passageway 420 extends downwardly from bottom wall 
418, and a valve seat portion 422 is provided at the entrance of 
passageway 420. 
The only difference between casting 400 and casting 300 is that casting 400 
has recessed opening 410 and does not have recessed opening 128. All other 
physical parameters of casting 400 are identical to those of casting 300. 
It can readily be seen, therefore, that castings 300 and 400 are 
producible by the same basic tooling, requiring only a simple adding or 
removing of the coring tooling for recessed openings 128 and 410. 
Shown in FIG. 9 is a valve body 500 produced by machining casting 400 so as 
to provide a gas outlet at boss 402. As shown therein, valve body 500 is 
provided with a drilled passageway 502 leading into chamber 416 instead of 
drilled passageway 90 as in valve body 16. Boss 404 of casting 400 is 
drilled and tapped to provide a passageway 504 and a threaded opening 506 
identical to passageway 120 and threaded opening 122, respectively, in 
boss 42 of valve body 16. Also, boss 402 is drilled, tapped, and 
spot-faced to provide a passageway 508 and a threaded opening 510 
identical to passageway 136 and threaded opening 139, respectively, in 
boss 40 of valve body 16. All other machining of casting 400 to produce 
valve body 500 is identical to that performed on casting 300 to produce 
valve body 16. 
In valve body 500, orifice screw 38 is attached in threaded opening 510 and 
pressure tap fitting 44 is attached in threaded opening 506 so that, as 
shown partially at 512 in FIG. 9, the path of gas flow through valve body 
500, when valves 12 and 14 are energized, is through passageway 502, 
chamber 416, passageways 420 and 504, chamber 406, passageways 412 and 
508, and opening 138 in orifice screw 38 to the burner. 
Referring to FIGS. 14 and 15, a valve body 600 is indicated wherein the gas 
outlet is provided at boss 46. Preferably, the same rough casting 300 used 
to produce valve body 16, portions of casting 300 being shown in FIGS. 12 
and 13, is also used to produce valve body 600, so that the same reference 
numerals used in describing rough casting 300 will be applicable. The 
machining of casting 300 to produce valve body 600 is similar to that for 
producing valve body 16 of FIG. 6. For clarity, however, new reference 
numerals will be utilized in relation to the machined portions. 
Referring to FIG. 14, valve body 600 is provided with a drilled passageway 
602, identical to passageway 90, leading into chamber 110. Boss 42 is 
drilled and tapped to provide a passageway 604 and a threaded opening 606 
identical to passageway 120 and threaded opening 122, respectively, in 
boss 42 of valve body 16. Boss 40 is not machined. Referring to FIG. 15, 
boss 46 is drilled, tapped, and spot-faced to provide a passageway 608 and 
a threaded opening 610 identical to passageway 136 and threaded opening 
139, respectively, in boss 40 of valve body 16. All other machining to 
produce valve body 600 is identical to that used to produce valve body 16. 
In valve body 600, orifice screw 38 is attached in threaded opening 610 and 
pressure tap fitting 44 is attached in threaded opening 606 so that, as 
shown partially at 612 in FIGS. 14 and 15, the path of gas flow through 
valve body 600, when valves 12 and 14 are energized, is through passageway 
602, chamber 110, passageways 114 and 604, chamber 124, passageways 130 
and 608, and opening 138 in orifice screw 38 to the burner. 
Referring to FIG. 11, valve body 16 can optionally be provided with a 
threaded and stepped opening 228 extending into chamber 72 for accepting a 
pressure tap fitting (not shown). Opening 228, which can also be provided 
in valve bodies 500 and 600, is utilized to check gas pressure in chamber 
72, which pressure is inlet pressure since chamber 72 is upstream of 
pressure regulator 10. 
While a preferred embodiment of the present invention has been illustrated 
and described in detail in the drawings and foregoing description, it will 
be recognized that many changes and modifications will occur to those 
skilled in the art. It is therefore intended, by the appended claims, to 
cover any such changes and modifications as fall within the true spirit 
and scope of the invention.