Gaseous fueled torch apparatus and fueling module therefor

GASEOUS FUELED TORCH APPARATUS

AND FUEL DE M3EULE

BACKGROUND AND SUMMARY OF TOE JWPHTICH

Ihe invention relates generally to various torch or torch-like apparatus for cutting, welding, or heating operations involving either metallic or non-metallic materials. More specifically, the invention relates to a fueling apparatus for supplying fuel to such torch or torch-like apparatuses. As used herein, the general term welding, includes welding, brazing, or other known operations by which separate items or pieces of material are joined or fused to one another with the use of a flame-producing torch or burner.

Cross-reference is hereby made to United States Patent No. 4,531,558, issued July 30, 1985, United States Patent No. 4,523,548, issued June 18, 1985, and United States Patent No. 4,522,159, issued Jine 11, 1985, all of which are owned ty the same assignee as the present invention herein and which are hereby incorporated by reference herein.

Various torches, burners, or other flame-producing devices are well-known for use in various operations, such as the welding, cutting or heating of various objects or various materials, including either metallic or non-metallic materials. Such torch ar torch-like devices produce a flame upon the combustion of a mixture of air or other oxygen-containing gases with a suitable fuel, typically, such suitable fuels include a variety of fuels such as propane, acetylene, natural gas, or other hydrocarbon gaseous fuels.

Ihe fuels for use in the above-mentioned operations are generally provided in storage tanks or vessels that are connectable to the torch apparatus. Because of the necessity for purchasing and transporting such fuels in pre-filled storage vessels, or for refilling and transporting previously-existing storage vessels, the provision of such fuels for the various operations described above is frequently very expensive and inconvenient in many applications. Furthermore, because of the differing operating pressures and other parameters associated with the above-mentioned operations, such fuels are frequently required to be supplied to the torch or torch-like apparatus at different flow rates or at different pressures, thereby resulting in incompatibility or non-exchangeability of equipment among some of the above-mentioned operations.

It is therefore one of the primary objectives of the present invention to provide for a fueling apparatus or a module is adapted for use in supplying a fuel to a torch or torch-like apparatus from a convenient, readily-available, and inexpensive source of said fuel, such as natural gas, for example.

Another of the primary objectives of the present invention is to provide such a fueling apparatus or module capable of delivering a gaseous fuel, such as natural gas, at a wide variety of flow rates and pressures, thereby being compatible and interchangeable among a wide variety of welding, cutting or heating operations.

Still another objective of the present invention is to provide such a fueling apparatus or module capable of being connected to a relatively low pressure gaseous fuel supply source, such as a typical residential or cannercial natural gas supply system.

A further objective of the present invention is to provide such a fueling apparatus or module that is relatively Inexpensive, simple and convenient to use, relatively inexpensive to manufacture, and that is preferably portable in order to maximize its use in a wide variety of locations.

Another objective of the present invention is to provide such a fueling apparatus or module capable of fueling a torch or torch-like apparatus directly from a readily-available gaseous fuel source, as well as being usable for recharging pre-existing gaseous fuel storage tanks for subsequent use in remote locations wh^re no gaseous fuel source is available.

According to the present invention, a fueling module is provided for supplying a gaseous fuel to a torch or other torch-like device at an elevated pressure fran a relatively law pressure gaseous fuel source, such as a residential or ccnmercial natural gas supply system, for example. An exemplary fueling module according to the present invention preferably includes an inlet readily connectable in fluid conmunication with the source of the gaseous fuel, a compressor for compressing gaseous fuel from the gaseous fuel source in order to increase its pressure, and a fueling module diBchary selectively and releasahly connectable to the torch for selectively supplying the compressed gaseous fuel thereto, including an adjustable regulator device for preselectively adjusting the pressure of the compressed gaseous fuel supplied to the torch. Preferably, the fueling module according to the present invention also includes a second, alternate fueling module discharge system for selectively bypassing the above-mentioned adjustable regulator device in order to discharge the compressed gaseous fuel directly from the compressor for purposes of recharging one or more gaseous fuel storage vessels, for example.

Various embodiments of the fueling module according to the present invention can include one or all of a variety of optional, hut preferred, features, such as a filter for filtering the gaseous fuel between the fueling module inlet and the compressor intake, a lubricant filter for trapping and collecting compressor lubricants from the compressed gaseous fuel fran the canpressor discharge outlet, a return system for returning the compressor lubricants to the intake of the canpressor, a cooling device for reducing the temperature of the compressed gaseous fuel from the canpressor discharge outlet, or a selectively operable valve system for selectively discharging the compressed gaseous fuel either through the above-mentioned adjustable regulator device or substantially directly from the compressor. Other optional, but preferred, features include an adjustable pressure cut-off device for pre-setting the maximum compressor discharge pressure and an adjustable relief valve system for pre-setting the pressure limit on the above-mentioned adjustable regulator device.

Additional objects, advantages and features of the present invention will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF TSE ERPWIN3S

Figure 1 is a perspective view of a gaseous fuel torch apparatus according to the present invention, including an exemplary fueling module connected for supplying a gaseous fuel to a torch device.

Figure 2 is a perspective view similar to that of Figure 1, but illustrating the exemplary fueling module of Figure 1 connected for supplying gaseous fuel for recharging one or more gaseous fuel storage vessels.

Figure 3 is a perspective view of the exemplary fueling module of Figure 1, with portions of its housing removed to reveal many of the internal components thereof.

Figure 4 is a schanatic flew diagram of the exemplary refueling apparatus of Figure 1.

EETAILED DESQttPTION OF THE

EMBODIMENTS

Figures 1 through 4 depict an exemplary anbodiment of a gaseous fuel torch apparatus in accordance with the present invention, including an exemplary fueling module adapted for alternate use in supplying a gaseous fuel, such as natural gas for exanple, to a torch device, or for optionally recharging one or more gaseous fuel storage vessels or tanks. One skilled in the art «ז ו יי readily recognize from the following discussion and the accompanying drawings that the principles of the invention are equally applicable to torch apparatuses and fueling modules other than those shown for purposes of illustration in the drawings. It will also be readily apparent fran the following discussion and the accanpanying drawings that the present invention is ackptable to a wide variety of applications in addition to the torch supply and storage vessel supply applications shown for purposes of illustration in the drawings.

In Figure 1, a gaseous fuel torch system 10 generally includes a torch assembly 16, an oxygen supply apparatus 18, and a fueling module 20, with an oxygen supply conduit 22 interconnecting the oxygen supply apparatus 18 with the torch assembly 16, and with a fuel supply conduit 24 interconnecting the fueling module 20 with the torch assenbly 16. The torch assembly 16 shown in Figure 1 is typical and representative of any of a wide variety of well-known torch assemblies camonly used in cutting, welding, or heating operations of various types. The torch assembly 16 generally includes an oxygen valve 26 and a fuel valve 28 for variably adjusting the fuel-and-oxygen mixture in a mixing portion 30 in order to produce a flame at a torch tip 32 upon combustion of the air-and-fuel mixture. Although not specifically shown in Figure 1, the torch assembly 16 can preferably include a reducing regulator for fine-tuning of the fuel supply by the user of the torch.

Like the torch assembly 16, the oxygen supply apparatus 18 is typical and representative of any of a wide variety of well-known oxygen supply devices canmonly used in cutting, welding, or heating operations. The oxygen supply apparatus 18 generally includes an oxygen tank 40, a shut-off valve 42, and an oxygen regulator device 44 for monitoring and adjusting the oxygen supply pressure and flew rate.

As shown in Figures 1 and 2, the fueling module 20 is adaptable for supplying a gaseous fuel to the torch assembly 16 through the fuel supply conduit 24» which is releasably connectable to the fueling module 20 by way of a quick-connect torch discharge fitting 50, or alternately and selectively adaptable for other purposes such as that shown in Figure 2. In Figure 2, a recharging conduit 58 is releasably connectable to a quick-connect tank discharge fitting 60 for supplying gaseous fuel through a manifold 62 to one or more storage vessels 64. By such an arrangement, the fueling module 20 also has indirect utility in torch apparatus applications at remote locations where no electrical power source or gaseous fuel supply source is available, thereby allowing one or more of the storage vessels 64 to be recharged, transported, and used for gaseous fuel supply at such locations. It should be noted, as is readily apparent to one «Finpd in the art,' that the fueling module 20 can also be used for alternate gaseous fuel supply applications other than storage vessel recharging as shown for purposes of illustration in Figure 2.

It should also be noted that the storage vessels 64 preferably contain a sorbent (adsorbent or absorbent) material in order to increase their gaseous fuel storage capacity. Examples of such storage tanks are di 601 na»d in the above-mentioned United States Patents (incorporated by reference herein), and examples of the sorbent materials include activated carbon, zeolite naterials, silica gel-type materials, or various days.

The fueling module 20 generally indudes a housing 66 equipped with one or mors ventilation louvers 68, one or more carrying handles 70, and a control panel 72. The control panel 72 indudes a main power switch 74 for energizing and de-energizing the fueling module 20, and a selector switch 76 for preselecting either of the modes of operation shown in Figures 1 and 2. The contrd panel 72 also indudes a power indicator light 78 for indicating to the user that the main power switch is in an on position, a torch indicator light 80 for indicating the sdection of the torch application shown in Figure 1, and a tank indicator light 82 for indicating the selection of the tank recharging or other such application shown in Figure 2. A torch pressure regulator control 86 is also provided on the control panel 72 for allowing the user to selectively regulate the gaseous fuel supply pressure in the torch apparatus application sham in Figure 1. A torch pressure gauge or indicator 88 is provided on the control panel 72 for monitoring the gaseous fuel discharge pressure in the torch mode, and a similar tank pressure gauge or indicator 90 is provided for monitoring the gaseous fuel discharge pressure in the mode of operation for recharging storage vessels or other such purposes.

Referring primarily to Figures 1 through 3, the various internal components of the fueling module 20 are contained within the housing 66 and are ncunted or otherwise interconnected with a chassis structure 94. The housing 66 and the chassis 94 are preferably designed for providing suitable durability for the fueling module 20 consistent with its intended purposes. However, as is readily apparent to those skilled in the art, the various components and structural configurations of the fueling module 20 should be as light-weight and compact in size as is practicable in order to provide maximum transportability and thereby greatly add to the overall utility cf the fueling module 20. In this regard, one early prototype cf the fueling module 20 was constructed with overall approximate dimensions of 14 inches (35.6 an) in width_r 28 inches (71.1 cm) in depth, and 15.5 inches (39.4 cm) in height, and weighed approximately 75 pounds (34 kg) in weight. It is envisioned, however, that the overall dimensions and weight of commercial versions of the fueling module 20 can be significantly reduced, without significantly affecting the durability, quality, and utility of the fueling module 20.

Referring primarily to the schematic flew diagram cf Figure 4, but with additional reference to Figure 3, the internal components, and the operation, of the fueling module 20 will new be described. The ultimate source of gaseous fuel for the fueling module 20 is a gaseous fuel supply system, indicated diagranmatically at reference numeral 100 in Figure 4. The gaseous fuel supply system 100 can consist of virtually any readily-available source of gaseous fuel, but which most preferably consists of a typical natural gas supply system of the type commonly found in many residential or ccmnercial installations. Such natural gas supply systems typically provide natural gas at pressures generally in the range of approximately 1/4 psig (1.72 kPa) to approximately 10 psig (69 kPa), ^panding upon the location and supplier of the natural gas supply system, and upon whether such supply system is provided for residential or coranercial use.

The fueling module 20 includes a quick-connect connector 102 for selectively and releasably connecting an inlet conduit 104 in fluid rmunimi rat־.inn with the supply syst® 100. The inlet conduit 104 preferably incl ud?R a solenoid-operated inlet valve 106, a filter 108, and a one-way check valve 110. The filter 108 can comprise any of a number of known filter apparatuses suitable for use with the particular gaseous fuel being supplied, but preferably includes a dessicant filter for removing moisture or other undesirable materials from the gaseous fuel. Although various types of dessicant filters may be ®ployed, one preferred dessicant filter 108 ®ploys a sorbent (absorbent or adsorbent) material, such as an activated carbon, a zeolite material, a silica gel-type material, or various clays, for ex®ple.

The gaseous fuel, which preferably consists of natural gas, is supplied through the inlet conduit 104, a tee fitting 112, and the other components described above to a compressor intake 114 of a compressor device 116, which is selectively energizable for canpressing the gaseous fuel in order to increase its pressure. In the actually-constructed prototype embodiment of the fueling module 20 described above, the compressor 116 was a hermetically-sealed gas compressor of the type commonly employed in refrigeration apparatuses. Such compressors are .jnoyponciυρ_f durable, and readily a«aiו ahi p as off— the—shelf items. One skilled in the art will readily recognize, of course, that other types of compressors nay alternatively be used. Preferably, however, the compressor 116 canpresses the gaseous fuel to a pressure generally in the range of approximately 100 psig (689 kPa) to approximately 500 psig (3450 kPa), depending upon the preselected parameters discussed below and the demands of the particular application.

The ™״pressed fuel is forcibly conveyed from a compressor discharge 118 through a conduit 120 to a compressor lubricant separator ]22, !he lubricant separator 122 can comprise any of a nunber of knam separator or filter-type devices adapted to remove lubricating oils or liquids from a gas strean passing therethrough. Preferably, the lubricant separator 122 is of the well-known gravity, capillary tube type and is adapted to return the collected compressor libricants to the compressor intake 114 through a lubricant return conduit 188, under the motivating force of the compressor discharge gas pressure.

From the lubricant separator 122, the canpressed gaseous fuel is preferably conveyed through a condenser or heat exchanger 124 for reducing the tanperature of the compressed gaseous fuel, ihe heat exchanger 124 preferably comprises a cooling coil, wer which ambient air is forced by a cooling fan 232. In the actually-constructed prototype embodiment of the refueling module 20 described above, the temperature of the gaseous fuel, which was natural gas, entering the heat exchanger 124 was approximately 140F (60C) and the natural gas temperature on the outlet of the heat exchanger 124 was substantially at ambient tanperature. Although the heat exchanger 124 has been depicted in the drawings as comprising the air-to-gas cooling coil apparatus described above, one skilled in the art will readily recognize that other types of heat exchangers, condensers or other cooling apparatuses may alternately be employed to reduce the temperature of the compressed gaseous fuel fran the compressor discharge

118 of the compressor 116.

Fran the heat exchanger 124, the compressed and cooled gaseous fuel is conveyed through a conduit 126 to a tee fitting 129, at which the compressed g^nns fuel can then be discharged fran the fueling module 20 through either of two alternate fueling module discharge systems, as illustrated in Figures 1 and 2. In the first fueling module discharge system, the compressed gaseous fuel is cornered fran the tee fitting 129 through a preferably solenoid-operated torch valve 130, a first discharge conduit 132, and a tee fitting 134 to an adjustable regulator 136. The adjustable regulator 136 can comprise any of a lumber of aonnnonly-available adjustable regulator devices operable for preselectively adjusting the pressure of a gas flowing therethrough; The adjustable regulator 136 is selectively operable by way of the above-mentioned pressure regulator control 86 on the control panel 72 in order to preselectively discharge gaseous fuel at a preselectively adjusted discharge pressure through the torch discharge fitting 50 fay way of a one-way check valve 140.

The fueling module 20 also preferably includes an adjustable relief valve 184 connected, by way of the tee fitting 134, in fluid coranunication with the inlet side of the adjustable regulator 136 in order to allow the selected pre-setting of the pressure limit for the adjustable regulator device 136. Because the compressor 116 is typically a constant-speed, constant-output oanpressor, it discharges a substantially continuous and constant compressed gaseous fuel output whenever it is energized. Thus, any excess output capacity of the compressor 116 must be returned to the compressor intake 114 by way of the relief valve 184 and a gas return conduit 186, which is connected in fluid coranunication with the compressor intake 114 by way of the tee fitting 112.

Because of the adjustable relief valve arrangement discussed above, the fueling module 20 can be selectively pre-set, by way of adjustment of the relief valve 184, for a maximin gaseous fuel discharge pressure through the above-described first fueling module discharge system that cannot be exceeded ty operation of the adjustable regulator device 136. lhe provision of the above features in the fueling module 20 thereby allows for an infinite preselected adjustment or variation of the fueling module discharge pressure for the torch mode of operation, with infinitely adjustable limits thereon, within the ranges of adjustability of the adjustable regulator device 136 and the relief valve 184, and within the naximum discharge capabilities of the compressor 116. In order to allcw the fueling module user to monitor the pressure at which the gaseous fuel is supplied in the torch mode of operation, a tee fitting 138 is provided on the outlet side of the adjustable regulator device 136 in fluid communication, through a conduit 162, with the above-discussed torch pressure indicator 88.

For the optioiBl alternate mode of operation of the fueling module 20, such as for the storage vessel recharging shown for purposes of illustration in Figure 2, the tee fitting 129 is also connected to a second fueling module discharge systsn by way of a second discharge conduit 152 and a preferably solenoid-operated tank valve 154. Compressed gaseous fuel in the second fueling module discharge eystem is conveyed directly from the tank valve 154, through a one-way check valve 156, a second discharge conduit 158, and a tee fitting 160, to the above-discussed tank discharge fitting 60. As is readily apparent in Figure 4, the second fueling module discharge system supplies canpressed gaseous fuel to the tank discharge fitting 60, without passing through the adjustable regulator device 136 of the first fueling module discharge system. This is because the discharge pressure in tank recharging is desired to be held below a pre-set maximum level in order to avoid overpressuring the tanks. In order to allow the operator to observe the pressure at which compressed gaseous fuel is discharged through the tank discharge fitting 60, thereby allowing the user to monitor the recharging operation for example, a conduit 164 is connected in fluid conmunication with the above-mentioned tee fitting 160 and with the above-mentioned tank pressure indicator 90 on the control panel 72.

In order to provide a pre-set maximum compressor discharge pressure, as well as providing for a fail safe feature in the event of a system malfunction, the fueling module 20 preferably also includes a tee fitting 177 in the second discharge conduit 152, which provides fluid cocmunication by way of a ccmpressor control conduit 178 to a pressure cut-off controller device 180. The pressure cut-off device 180 is preselectively and adjustably pre-settable for a maximum overall ccmpressor discharge pressure and, as will be described in more detail below, is capable of de-energizing the ccmpressor 116 by way of a control conduit 182 interconnecting the pressure cut-off 180 and the drive motor (not shown) of the compressor 116. Die pressure cut-off device 180 can be adjustably pre-set in order to provide upper limits on the gaseous fuel discharge pressure through either of the fueling module discharge systems, as well as providing automatic shut-off of the compressor 116 in the event of down-strean conduit or hose ruptures, or various other malfunctions in which compressor de-energization is necessary or desirable. It is preferred that once the pressure cut-off controller 180 has de-energized the compressor 116, it can be reset to resume operations only by a manual resetting procedure in order to encourage the user to ascertain the cause cf the compressor de-energization and correct any malfunctions prior to resuming operations.

In order 10 provide for the various functions and features described above, the fueling module 20 includes a power and control systsn, shown diagranmatically in Figure 4, for energizing, de-energizing, and controlling the various components. The fueling module 20 is preferably electrically powered and is releasably connectable with a conventional external electrical power source 200 by way of a conventional electrical connector 202. Electrical energy is conveyed by way of an electrical supply line 204 to the above-described main power switch 74, which is selectively operable to either an on position or an off” position.

When the main power switch 74 is in its on position, electrical energy is conducted by way of an electrical feed line 206 and a power indicator feed line 210 to the above-described power indicator light 78 on the control panel 72, thereby providing indication to the operator that the fueling module 20 is energized. Electrical power is also supplied through the main power switch 74, the electrical feed line 206, and a selector switch feed line 208 to the above-mentioned selector switch 76 for purposes that will be described in more detail below. The main power switch 74 is also the vehicle for supplying electrical power by way of other electrical feed lines 218 and 220 and a compressor feed line 222 to the motor drive (not shown) for the compressor 116, thereby allowing the compressor 116 to be selectively energized and de-energized through the main power switch 74. The electrical feed line 218 also branches off into an inlet solenoid feed line 224 in order to energize an inlet solenoid operator 226 for purposes of opening the inlet valve 106 when the system is energized, or for closing the inlet valve 106 when the system is de-energized.

A fan motor feed line 228 is also provided for supplying electrical power from the main power switch 74 to the fan motor 230 of the heat exchanger fan 232. Thus, the compressor 116, the fan motor 230 and the fan 232, and the solenoid-operated inlet valve 106 are all energized and de-energized, along with the selector switch 76 and the power indicator

-Blight 78, fey way of operation of the main power witch 74.

Once the fueling module 20 has been energized so that the selector witch 76 is energized, the selector witch 76 can be selectively operated to the so-called torch position in order to energize the first solenoid operator 170 on the torch valve 130, by way of a first electrical aontrol line 174. Similarly, if the selector switch 76 is moved to the so-called tank position, a second solenoid operator 172 is energized ty way of a second electrical control line 176 for purposes of opening the above-mentioned solenoid-operated tank valve 154. Therefore, when the selector switch 76 is moved to the so-called torch position, the solenoid operator 170 is energized to open the torch valve 130, and substantially simultaneously, the solenoid operator 172 is de-energized so as to dose the tank valve 154. Conversely, when the selector witch is moved to the so-called tank position, the solenoid operator 172 is energized to open the tank valve 154, and substantially simultaneously, the solenoid operator 170 is de-energized to dose the torch valve 130. Ey such an arrangement, the fueling module 20 can be employed for discharging compressed gaseous fuel, preferably natural gas, either through the first fueling module di arhary system for purposes of tank operation, or through the second fueling module discharge system for purposes of storage vessel recharging or other such applications.

In order to provide the user with an indication of whether the tordi or tank mode has been selected, an electrical torch indicator feed line 214 is electrically interconnected to provide pwer from the first electrical control line 174 to the torch indicator light 80. similarly, an electrical tank indicator feed line 212 supplies electrical power between the second electrical control line 176 and the tank indicator light 82.

The operation of the fueling module 20 can be briefly and generally described by starting with the appropriate interconnection of the fueling module 20 for the desired mode of operation either for the torch assembly 16, as shown in Figure 1, or for the storage vessels 64, as shown in Figure 2. Ihe fueling module 20 can then be interconnected with the gaseous fuel supply system 100 by way of the quick-connect connector 102, followed by electrical interconnection with the electrical power source 200 by way of the electrical connector 202.

When the main power switch 74 is moved to its on position, the power indicator light 78, the selector switch 76, the compressor 116, the fan motor 230, and the inlet solenoid operator 226 are all energized in order to open fluid camunication with the gaseous fuel supply system 100 and to start the fueling module 20. Depending upon which position of the selector switch 76 has been selected, the appropriate torch indicator light 80, or the tank indicator light 82, is also energized and illuninated.

When the main power switch 74 has been moved to its on position, and the selector switch 76 is moved to the torch” node position, the torch valve 130 is opened, and the tank valve 154 is simultaneously closed. This condition allows the compressed gaseous fuel to be supplied through the first fueling module discharge system to the torch assanbly 16, with the discharge pressure being selectively adjusted and controlled by the adjustable regulator 136 and its torch pressure regulator control 86. Such discharge pressure regulation can be accomplished within the pre-set limits imposed on the first fueling module discharge systan by the preferably manually adjustable relief valve 184, as described above.

Similarly, when the selector switch 76 is moved to the tank position, the tank valve 154 is opened, and the torch valve 130 is substantially simultaneously closed, in order to discharge compressed gaseous fuel through the second fueling module discharge system substantially directly to the storage vessel 64 or for other fuel-using applications. As mentioned above, the fueling module discharge pressure in either of the above-described modes of operation is ultimately governed by the selectively pre-set maximum compressor discharge pressure setting of the preferably manually adjustable pressure cut-off device 180.

Conversely, when the main power switch 74 is moved to its off position, the above-described components are de-energized in order to shut down the entire fueling module 20. In this regard, it should be noted that remains in the fueling module 20 due to the fact that there is no provision for internal storage of compressed natural gas. This feature significantly adds to the safety of the fueling module 20 by substantially avoiding the build-up of pressurized gaseous fuel therein during periods of non-use.

In order to provide examples of suitable components for the exemplary fugling module 20, a chart is set forth below, wherein many of the major nompongnts of the fueling module 20 are identified either generically or by supplier or other relevant product information, accompanied by appropriate trade names or trademarks where applicable. It should be aaphasized that the information provided below is merely exemplary, and that one skilled in the art will readily recognize that a wide variety of equivalent or alternate components may also be employed.

<td> Component Reference Mineral_________</td><td> Bescxiptifin</td>

<td> 50</td><td> Brass OSA Hose Adapter/Fitting</td>

<td> 60</td><td> Swagelok SS-QC4-B-4PF Female, Single End, Shut-Off Quick-Connector</td>

<td> 76</td><td> 15 Anp, 115V, DPDT Selector Switch</td>

<td> 88</td><td> Wika Hl.10, 2-1/2 Inch, 0-30 Psi, CBb/U-C Pressure Gauge</td>

<td> 90</td><td> Wika Hl.10, 2-1/2 Inch, 0-400 Psi, CBM/D-C Pressure Gauge</td>

<td> 106</td><td> Valoor SV-62, Normally Closed Sole,.־nd Valve, 1/4 Inch Port Diameter, 115V., 60 Hz.</td>

<td> Component Reference ____Uuneia]_________</td><td> Description</td>

<td> 108</td><td> Dessicant-filled Moisture Separator/Filter Assembly</td>

<td> 116</td><td> Copeland JRL4-0050-IAA Welded Hermetic Compressor</td>

<td> 122</td><td> *AC&amp;R Components S-5580 Oil Separator</td>

<td> 124</td><td> Heat Exchanger, Double Row, 575 Psig, W.P.</td>

<td> 130/154</td><td> Valcor SV-12, Normally Closed Solenoid Valve, 1/4 Inch Port Diameter, 115V., 60 Hz.</td>

<td> 136</td><td> Tescom Hand-Loaded Pressure Reducing Regulator, 0-50 Psig Outlet</td>

<td> 140</td><td> *Nupro 4CP In-line Check Valve</td>

<td> 184</td><td> Nupro 4CPA Adjustable In-Line Relief Valve</td>

<td> 230</td><td> Steveco Fan Motor Assembly 9W-CCW, 115v., 60 Hz.</td>

The foregoing discussion discloses and describes exemplary embodiments of the present invention. One skilled in the art will readily recognize from such discussion, and fran the accompanying drawings, that various changes, modifications and variations may be made therein without departing from the spirit and scope of the invention as defined in the following claims.