US2163800A - Valve - Google Patents

Description

June 27, 1939. w N V N 2,163,800

VALVE Original Filed Sept. 8, 36 2 Sheets-Sheet 1 i 1 1 I I i an 3; a 1

\/ Z Zhwentor H. W. NEVIN June 27, 1939.

VALVE Original Flled Sept. 8, 1936 2 Sheets-Sheet 2 luncutor NM MW x w I m 5 m .wh

' Patented June 27,

UNITED STATES.

PATENT ome 'porationotDelavru-e Original application September a, ma. semi no.

- 99,775. Divided and this application February 12.1937, Serial No. 1st,? 7

11 Claims. (cl. 137-458) This invention relates to means for automati-H 1 caliy opening and closing the lbwpressure or suction line of a refrigeration system by empl ing the diilferential in pressure between the 5 pressure or liquid line of the system and the 1 pressure line. r

'I'hisfapplicatibn is a division oi'my application entitled Refrigeration system, Serial No. 99,775, filed Septemberfii 1936.

One of the objects of the invention is to pro-u v ld e means for automatically opening and closing the suction line from the evaporator in a prompt and positive manner so as to accurately control the temperature of the refrigerated space. v

Another object of the present invention is to provide for refrigeration systems a simple, practical and efllcient automatically operating pressure actuatedsuction stop valve of strong, durable as and comparatively inexpensive construction de-' signed to be connected in the suction line and the liquid line of a refrigeration system between the float valve of the cooling coil and theliquid stop valve of the refrigeration system and adapted as to prevent further retrigerative efl'ect at a predetermined time as for instance when a thermostat in the refrigeration chamber operates to close the liquid stop valve.

A further object of-the invention is to provide "ill a pressure actuated suction stop valve of this character adapted to prevent the flow of gas through the suction line to the condenser or v compressor when theiiow of liquid through the q idlineisshutoifand ajfreeflowof s liquid through the liquid line and a free flow of gas through the suction line when the liquid stop valve is open'and capable also of eflectively pre-f venting counterflow of gas through it ,when the liquid flow is b Avfurther object of the invention is to provide a pressure actuated suction stop valve adapted to allow considerable liquid pressure to'be applied to 1 whereby a positive opening of the suction line is eiiected when the liquid stop valve is "5 openedtopermitflowoftheliquidtothecoqlilil or expansion coil.- V A further object of the invention isto'vprovide' means for controlling the speed of operation or- 'thesuctionstopvalvesothattheopeningofthe same may be retarded to the desired extent and isfull opening of the suction stop valve at the 'desired time with relation to theliquidtothecoolingculll,

Another object or the invention is sesame f a pressure actuated suction stop valve which liquid. In the evaporator, the ammonia passes willbecharacterised by aniy-lowcost of operation and maintenance compared with v the means heretofore employed for controlling the flow through: the suction and liquid lines of arei'rigerationsystem. f5

Aswillbe apparent fromthedescriptionwhich follows, the present invention involves the introduction of a stop valve interposed athwart the high pressure section and the low pressure section of a fluid line having relatively high pressure and low pressure eectlons.

It is well known of course, that refrigeration systems employ a fluid line having relatively high pressure and low pressure sections The ammonia comes from the compressor under relatively'high pressure and proceeds through the high pressure section of the line to the evaporator, existing in this sectionofthe line as a to the gaseous phase andreturns to the compressor under relatively lower pressure to be compressed and recirculated. g

It is, of course, common to provide 'thermostatic means for stopping the flow of liquid from the compressor, this normally being eflectedby the use of a thermostat which operates to stop the operation of the compressor at a predetermined tempratute of the reirigersted'spsce.

Refrigeration plants may be considered for present purposes as being of two types, namely,

such installations, a separate thermcstatin each continuestooperate. This tlon is to operate amssnetie liquid intheliquidlineleadingtothechsmherin -tion.'siterthenowetliquidtotheevspontor 10 Magnetic stop valves have been unsatisfactory in practice because of frequent failure due to the necessity of employing an unloader or pilot valve. The differential in pressure in the line is obviously too great to permit positive operation of a valve solely by the employment of a solenoid of any practicable dimensions. The usual solenoid employed has a total lifting power of but three to five pounds and must operate against a pressure differential of aboutthirty pounds per square inch, or a total pressure of,

about ninety-four pounds in a two inch line. An

unloader employs the pressure of the line to unseat the valve when the solenoid opens a needle valve to reduce the pressure within the unloader piston.

The necessity of closely fitting the piston in the valve cylinder to prevent excessive gas leakage often results in the piston sticking and the coil burning out. tion on the refrigerated space unless the suction line is opened, it is obvious that the failure of the valve is tantamount to a failure of the system. It is'immaterial whether the failure of the valve is due to sticking or the burning out of the coil.

The present invention affords positive control of the suction line valve without the employment of electromagnets or pilot valves. In the case of magnetic valves, the objectis to overcome the suction line pressure by means of magnetic power and unloaders. In the present invention, the high pressure of the liquid line is utilized to readily overcome the lesser pressure of the suction line.

In an ordinary installation employing a two inch suction line, a pressure of one hundred fifty pounds on the liquid line, the total difierential in pressure available to actuate the suction line valve is approximately four hundred It will be. that the present inventlon is not limited to any partiwlar valve or mechanicalstructurebutisdirectedbroadiyto the employment of liquid line pressures to operate suction line alves in refrigeration systems. In the dram,'similar reference characters in the several figures indicate similar elements.

Figure. 1 is a. tic view of a refrigeration system employing the present invention.

Figure 2 is a central vertical sectional view of a pressure actuated suction stop valve constructed in accordance with this invention.

Figure3isahorlzontalsectionalviewtaken substantially on the line l-i-of Figure 2.

Figureiisa'similarviewonthelinei-i of Figure 2.

The operation of the present invention may bereadflyunderstoodbyreferencetolqgurel in which compremor liii, driven by motor IIIZ, forces com gas through pipe iii; to condenser IM. fiie liquid from condenser I54 passesinto receiver Hi5, thence through pipe M8 to pipes ill! and 4|. Pipe I01 leads to evaporators not shown. Magnetic liquid stop valve I08 is provided in pipe Ii to close it when ac- Since there can be no refrigera- I tuated by thermostat I". The liquid passes through the control section of valve 0, thence through pipe I! and float or thermal valve ill by which the liquid is fed to evaporator m as required.

Evaporator H2 is placed in the space to be refrigerated as for example a brine tank or a chamber. Gas passing from evaporator H2 passes through pipe 4 into the suction cutoff of valve Ill, thence through pipe to compressor 10 ilii. Pipe I I3 leads to the compressor from other evaporators not shown. Motor ")2 is started by magnetic switch. H4 controlled by thermostat "I9. 1

Valve H0 isshow'n in detail in Figures 2, 3,

and 4, and comprises in its construction a tubular main valve body I constituting the upper portion of the body or casing of the device and forming a longitudinal passage having upper and lower cylindrical chambers 2 and 3 and provided with a. gas inlet 4 and a gas outlet 5 communicating with the gas inlet); passages 6 and 1 extending inwardly from the gas inlet and the gas outlet and communicating with the upper cylindrical chamber 2. The gas inlet 4 is located at a higher elevation than the gas outlet 5 and the upper cylindrical chamber 2 of the main valve body I is provided with a valve seat 8 located between the gas inlet 4 and the gas outlet 5 and adapted to receive an upper valve disk 9 for closing comw munication between the gas inlet 4 and the gas outlet. 5 for shutting oi! the flow of the gas through the suction line from the cooling or expansion coil of a refrigeration system to the compressor'or condenser thereof.

The pressure actuated suction stop valve is applicable to refrigerating systems having a pointof controlled'varying pressures, the two pressures being the evaporator and the condenser pressures.

The passage 6 extends directly from the gas inlet 0 l to the upper cylindrical chamber 1 and the passage 1 which extends inwardly from the gas outlet extends across the :main valve body I from the gas outlet 5 to the opposite wail of the said body i and it communicates with a reduced por- 5 tion ill of the upper cylindrical chamber 1. The valve seat 8 is'formed by a valve seat ring Ii which is threaded into an annular recess I 2 formed by an enlargement pf the reduced portion ll of the lower end ofthe cylindrical chamber 2.

-'l'he valve seat ring Ii is bevelled at its inner face at its upper edge and the upper valve disk 9 is correspondingly bevelled to fit the valve seat.

Grooves II in the walls of upper valve,disk 9 serve to permit gas e between chamber 2 and passage 6 to equalize the pressure. The passage i is enlarged as illustrated at It, thus permitting pressure equalization on all sides.

The upper valve disk I is urged downwardly by a coiled spring I! fitted in socket OI of the uppervalvedisklandheidinplacebyboss l0 intopcapli. 'I'opcapliissecm-edtotheupper endofthemainvalvebodylbythreadedstuds i1 and nuts i8. "lhe coiled spring positively closes the upper valve disk and while the presa sure actuated suction stop valve is preferably arranged in a vertical position, it may, of course,

beau-ranged in any other desired position as the coiled spring II will positively close the upper valve disk 9 and maintain the same flrmlyagainst its seat 8 when the pressure in the liquid line is reduced as hereinafter fully explained. The top cap studs I! are fixed to the upper end of the main valve bpdyand'the nuts l8 engage the upper face of the top capwhich is pierced by the 1 lower lace with a central boss it into the upper. end or the coiled ters the salne.'1'he's ald top cap isalsoprovided at its lower iace with an annular rib It arranged concentric with the central boss II and adaptedtobearagainstatopcapgasket it which is fitted in an annular recess 22 in the upper end lot themain valve body I. The annular rib 2| and the top cap gasket 2| tom a-gas tight joint between the top cap and the main valve body to prevent the escape of gas.

When the upper valve disk is closed, it 01! communication between the gas inlet and the gas outlet and prevents the flow gas through the suction line. The upper .valve disk is connected by a piston stem II with a piston head it which carries a lower valve disk 25 and which operates in a lower cylindrical chamber 3. The

ll piston stem 23 extends downwardly from the upper valve disk and is guided at I! in the main valve disk' body and its lower end is preferably I" is opened to permit liquid to flow through the liquid linetothe evaporator H1. 4

The check valve body is provided with a liquid inlet II and a liquid outlet 41 and it has a liquid passage ll connecting the liquid inlet and the 5 liquid outlet and consisting. of a horizontal branch or"portidn and a vertical branch or portion II. The horizontal branch or portion extends inwardly from the liquid inlet ll and the vertical branch 45 extends upwardly from the inner-end oi the'horizontal branch or portion 44 to the liquid outlet 42. The liquid inlet and the liquid outlet are threaded tor; pipe connections and the gas inlet and the gas outlet are also threaded for the same purpose. When liquid ows through the liquid line it enters the liqui inlet of the lower check valve body and passes through the passage 43 which connects the liquid inlet with the liquid outlet and a portion oi the liquid also enters the passage 9| through a chamber It communicating with passage 44 and having a lower reduced inlet threaded into the piston'head :p 41 provided t av zv seat as with with a jam nut 28, but the stem II which is ll shown fitted in socket Q2 of the upper valve disk llnaybeconnectedwitht liwr valve'diski and the lower piston head II in any other desired manner as will be readily understood.

The piston head 24 is provided with piston rings 80 as and the lower valve disk 25 cooperateswith a valve seat formed by a removable valve seat ring 3| preferably threaded into the main valve body i as indicated at 82. The'lower edge of the valve seat ring II is bevelled to form the valve I seat 30 and the lower portion a of the lower cylindrical chamber is enlarged forming an annular space below the valve seat surrounding the lower valve disk 25 and the lower portion of the piston ll. go The lower valve disk I! is oil-greater diameter than the piston head 24 and is bevelled as shown to cooperate with the bevelled valve seat. The piston 24 consists of a reduced cylindrical extenslon oi the lower valve disk 25 and is preferably formed integral with the same. The lower end of the main valve body I is provided with an annular groove for-the reception of a check valve body gasket 85 and a check valve body 38 is secured to the lower end 0! the main valve body I by lower check valve studs 3'! and nuts 38. The check valve body conforms to the conflgurationoi the main valve body and is provided at its upper end with an annular rib I9 whichflts within the annular groove II o! the lower end of the main valve body and bears against-the lower-check valve body gasket Ii. The studs 31 are fixed to the lower end 01' the main valve body and pierce portions oi the upper end of the check valve body and the nuts ll maintain the annular rib II in tight clamping engagement with the lower check valve body gasket}! to term a liquid and gas tight connection to prevent the escape of any liquid or gas from the device. The lower check valve bodyc'onstltutes the lower portion of the body of the device ,and it is 1 provided in its upper end with a circular recess II which communicates with a vertical liquidpassage 90 for admitting the liquid to the lower face of the lower valve disk for subjecting the same and til piston head to the pressure of the ,liquid line for causingsuchrpressure' to over come the action or, the coiled spring I! and open the upper valve disk {when the liquid stop valve liquid stop valve is closed.

which a needle valve 49 cooperates for controlling the flow t the liquid through the passage 25 Q0 and the n 01' the liquid pressure to the lower valve disk 25 and consequently the opening or the upper valve dish 9. By adiusting the needle valve 49, the opening of the valve disk 9 for permitting the flow ofthe gas through the '30 main valve body may be retarded to prevent damage to the valve by the high pressures eml l The lower check valve body is also provided with a by-pass passage 50 connecting the main liquid passage 43 with the chamber l6 and the passage ll so that the liquid -may flow freely tromthe lower cylindrical chamber l of the main valve body into the liquid line when. the

The needle valve 48 has a threaded portion 5| which engages an upper threaded portion 52 of a vertical opening or bore 53 in the lower end of the check valve body. This permits an adjustment of the needle valve 49 with relation to the tapered lower end or valve seat of the reduced portion ll 0! the chamber 46 of the lower check valve body. The'lower portion 54 of the 1 bore or opening 53 is threaded to receive a gland $5 and packing 56 which is interposed between 5 the gland i5 and a stufllng box washer i! to form a stuillngbox to provide a liquid and gas tight connection or joint around the needle valve for preventing the escape or liquid or gas. The lower portion]! of the check valve body is reduced and exteriorly threaded at I! to receives lower cap ,60 interiorly threaded at the upp end to engage the threads 59 o! the lower reduced portion 8! of the lower check valve body. A bottom cap gasket Ii is arranged between the upper edge of the bottom cap and the shoulder 62 formed by a reduction of the lower portion of the lower check valve body; 7

Check valves are provided in the ma n passage I and in the by-pass passage SI for purposes hereinafter described. The check va ve of the main liquid passage It comprises a check valve disk It and a valve seat I consisting of an interiorly bevelled portion oi a sleeve 85 arranged -in a boreor opening ll extending upwardly from c 43 and it forms a shoulder l1 surroundin g the upper end oi the vertical branch 45 oi. the main liquid passage and receiving a gasket which is engaged by the lower end 01' the sleeve '5. The lower end of the sleeve II is reduced interiorly and exterioriy to form an annular rib I! for engaging the gasket It. A retaining plug Ill is threaded into the upper end of the bore or opening it and engages the upper end of the sleeve 0!. The retaining plug I. holds the sleeve tightly in engagement with the seat gasket 08. The sleeve is provided at the liquid outlet with opposite openings 1| and it has an exterior annular recess I! which provides an annular space or passage around the sleeve tor connecting the openings II to facilitate tree passage 0! the liquid through the lower valve body.

The by-pass check valve comprises a check valve disk 13 arranged upon a check valve seat ll of a sleeve "I5 constructed similar to the check valve sleeve heretofore described and arranged in a vertical bore or opening 18 extending from the chamber 40 and the by-pass II to the upper end of the lower check valve body. The bore or opening 16 is 01. greater diameter than the chamber 46 to form a shoulder 11 on which is seated a gasket It. The lower end of the sleeve is reduced to form a gasket engaging rib I9. Also the sleeve is provided with opposite openings 80 and it has an exterior annular recess Ii forming a space around the sleeve at the said openings. The lower check valve body is provided with clean-out plugs 82 and I! mounted in threaded openings N and I which are arranged in line with the openings of the seat forming sleeves of the check valves.

The sleeve II is retained in the opening or bore I! by a retaining plug ll threaded into the upper end of the bore or opening II and constructed similar to the threaded retaining plug 10. A filler block or piece I is interposed between the retaining plug I. and the upper end of the sleeve.

The gas passes through the main valve body in the direction oi the arrow pointing toward gas inlet I in Figure 2 of the drawings and the liquid passes through the lower check valve body in the direction 01' the arrow pointing toward liquid inlet ll in Figure 2 of the drawings, the liquid flowing to the right in the said figure and the gas to the lei't. Starting from a closed position with the magnetic liquid stop valve of the refrigeration system closed, the thermostat ot the reirigeration system opens the magnetic valve and permlts the high pressure liquid to extend as tar as the float valve on the expansion or cooling coil. As the liquid passes through the lower check valve body which with the parts carried thereby constitutes the control iy of the suction stop valve, pressure is applied to the high pressure piston which opens the valve on the suction line. when the desired temperature is reached in the refrigeration chamber, the thermostat closes the liquid magnetic stop valve and the float valve releases the pressure between the magnetic stop valve and the evaporating coil. The lowering or the pressure on the piston on the high pressure side or the suction stop valve allows the suction stop valve to close and further refrigeration is stopped until the magnetic liquid stop Tvalve is again opened lay-the thermostat.

I The pressure of the liquid entering passageway 43 will cause a portion of the fluid to pass needle 2!, by which valve disk II will be raised against the action of spring I! and thereby open suction valve I in passageway I.

-When reirigeration is discontinued and the liquid stop valve closed. the pressures in the liquid line and the suction line will be balanced until after closing of suction valve 8, which closing should be rather prompt for most emcient operachamber Ill and in all of the channels of the control section oi valve llil drops to the evaporator pressure. It will be readily appreciated that at the lower pressures the back row of liquid through the small opening of needle valve 49 would be very slow. Since prompt response and consequent closing of the suction line is desired, check valve I3 is provided. The weight oi piston 24 augmented by spring I! causes the liquid in conduit to raise the relatively light weight check valve disk 13 and permit the liquid from chamber 33 to pass out through conduit Ill and thence out pipe 42 to the evaporator without delay. Alter the piston has dropped. check valve disk 13 reseats and remains seated until again urged upwardly when the magnetic liquid stop valve has opened and again closed.

Check valve 68 serves to prevent counterflow of gas through the lower check valve body when the refrigerating system is not in operation.

The pressure in the liquid line to the evaporator or cooling or expansion coll will vary between the liquid cutoil' valve and the float or thermal expansion valve. Between these two points-the pressure will either be that ol the condenser or liquid pressure or that 0! the evaporator or cooling coil, the pressure being dependent upon the opening and closing of the liquid stop valve which is determined by the desired temperature in the refrigerated space through the action of the thermostat. when refrigeration is required and the liquid stop valve is opened. the condenser pressure is applied to the piston or the motion valve which is greater than the combined pressure or the coiled spring and the evaporator or gas pressure on the upper valve disk 9 causing the valve disk 1 to open. The valve disk 9 remains in its open position as long as liquid is fed to the evaporator coil. when reirigeration'is discontinued and the liquid stop valve closed, the pressure in the liquid line between the stop valve and the expansion or float valve is gradually reduced to the pressure inside of the evaporator and this permits the suction stop valve to close. The opening movement of the valve disk I is controlled by the needle valve of the control assembly so that the valve disk 0 will open at the proper time with relation to the flowoi the liquid through the liquid line.

. As the device is entirely enclosed. it will operate under any moisture conditions.

I claim:

1. A stop' valve eomprising a housing, a high pressure passage in said housing, a low pressure valve II, through liquid conduit II and into *passage in said housing, a val've normally seated is chamber "against the lower face oi valve disk to close said low pressure passage, a piston actuarcasoo ated means for unseating said low pressure valve. said piston actuated means provided with a piston operable in a chamber interposed between said high pressure passage and said low pressure passage. said piston chamber communicating with said high pressure passage through a communication oriflce, an adjustable fixed needle valve in said commimlcation orifice to control flow volme from said high pressure passage through said communication oriflce for timing actuation of said piston by fluid pressure provided by fluid passing from said high pressure passage through said communication orifice to said piston chamber, and a bypass between said high pressure pas-.

sage and said communication orifice having a pressure actuated check valve interposed therein operable to accelerate closing of said low pressure valve upon-release of fluid pressure in said high pressure section, and a check valve insaid high prqsure e to prevent counterflow of gas therethrough.

2. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inlet and a gas outlet for connection with the suction line of the refrigeration system andprovided with a passage connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urging the valve member to its closed position,.a piston connected with the valve member, a body portion having a liquid e for connection with the liquid line of the refrigeration system and-provided with a liquid conduit communicating with the liquid passage and arranged to deliver liquid pressure to the piston for actuating the same to move the valve member to its open position, a by-pass passage connecting the liquid conduit with the liquid passage, check valves located in the by-pass passage and in the liquid passage for preventing counterflow oi gas through the said passages. said check valves comprising check valve sleeves having interior valve seats, and check valve disks arranged within the sleeves cooperating with the valve seats, the last mentioned body portion being provided with openings receiving the valve sleeves.

3. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inlet and a gas outlet for connectlon with the suction line of the refrigeration system and provided with a e connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urging the valve member to its closed position, a piston connected with the valve member, a body portion having a liquid passageior connection with the liquid line of the refrigeration system and provided with a liquid conduit communicating with the liquid passage and arranged to deliver liquid pressure to the piston for actuating the same to move the valve member to its open position, means for controlling the passage of liquid through the said conduit for controlling the opening movement of the valve member,'and means including a by-pass between said conduit and said liquid passage and a check valve interposed in said by-pass operable to quickly release the liquid pressure from said piston to accelerate closing of saidvalve, the inlet ti: said by-pass being located between said controlling means and said piston.

4. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inlet and a gas outlet for connection with the suction line of the refrigeration system and provided with a passage connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urging the valve member to its closed position, a piston connected with the valve member, a body portion having a liquid passage for connection with the liquid line of the refrigeration system and provided with a liquid conduit communicating with the liquid passage and arranged to deliver liquid pressure to the piston for actuating the same to move the valve member to its open position, a by-pass passage connecting the liquid conduit with the liquid passage, and a check valve located in the by-pass passage, said check valve being automatically operable by pressure of liquid returning from said liquid conduit whereby pressure against said piston and closing of said valve between the gas inlet and outlet is accelerated.

5. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inlet and a gas outlet for connection with the suction line of the refrigeration system and provided with a passage connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urging the valve member to its closed position, a piston connected with the valve member. a body portion having a liquid passage for connection with the liquid line of the refrigeration system and provided with a liquid conduit communicating with the liquid passage and arranged to deliver liquid pressure to the piston for actuating the same to move the valve member to its open position. an adjustable needle valve for controlling the e of liquid through the said conduit for controlling the opening movement of the valve member, means for quickly releasing the liquid pressure against said piston to accelerate closing of the valve between said gas lnletand outlet, and a check valve in the liquid passage for preventing counterilow of gas therein, said check valve com prising a check valve sleeve having an interior valve seat, and a check valve disk arranged with in thesleeve and cooperating with the valve seat.

6. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inletand a gas outlet for connection with the suction line of the refrigeration system and provided with a passage connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urgin the valve member to its closed position, a piston connected with the valve member, a body portion having a liquid e for connection with the liquid line of the refrigeration system and provided with a liquid conduit communicating with the liquid the liquid passage, check valves located in the by-pass passage and in the liquid passage for preventing counterflow of gas through the said passages, said check valves comprising check valve sleeves having interior valve seats, check valve disks arranged within the sleeves cooperating with the valve seats, the last mentioned body portion being provided with openings receiving the valve sleeves, retaining plugs threaded into the said openings for securing the sleeves in the said openings, and a filler block interposed between the check valve of the by-pass passage and the retaining plug associated with such check valve.

7. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a body portion having a gas inlet and a gas outlet for connection with the suction line of the refrigeration system and provided with a passage connecting the gas inlet and outlet, a valve member operating between the gas inlet and outlet for opening and closing communication between the same, a spring for urging the valve member to its closed position, a piston connected with the valve member, a body portion having a liquid passage for connection with the liquid line of the refrigeration system and provided with a liquid conduit communicating with the liquid passage and arranged to deliver liquid pressure to the piston for actuating the same to move the valve member to its open position, a by-pass passage connecting the liquid conduit with the liquid passage, check valves located in the by-pass passage and in the liquid passage for preventing counterflow of gas through the said passages, said check valves comprising sleeves having interlor valve seats and provided with opposite openings and having an exterior recess extending around each sleeve, ,check valve disks arranged within the sleeves and cooperating with the valve seats, said last mentioned body portion having clean-out openings communicating with the recesses of the sleeves, and clean-out plugs normally closing the clean-out openings.

8. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve includinga main valve body having a gas outlet and a gas inlet and a passage connecting the same and provided with upper and lower cylindrical chambers and having valve seat rings mounted therein, an upper valve disk cooperating with the upper valve seat ring for opening and closing communication between the gas inlet and the gas outlet, said upper valve disk having wings guided in the upper cylindrical chamber, a lower valve disk cooperating with the lower valve seat ring and having a piston head operating in the lower cylinder, a piston stem connecting the upper valve disk with the piston head, a coiled spring arranged within the upper cylindrical chamber and hearing against the said wings for urging the upper lease the liquid pressure from said piston to accelerate closing said uppeilvalve disk and a check valve in said liquid passage to prevent counterflow of gas therethrough.

9. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a main valve body having a gas outlet and a gas inlet and a passage connecting the same and provided with upper and lower cylindrical chambers and having valve seat rings mounted therein, an upper valve disk cooperating with the upper valve seat ring for opening and closing communication between the gas inlet and the gas outlet, said upper valve disk having wings guided in the upper -cylindrical chamber, a lower valve disk cooperating with the lower valve seat ring and having a piston head operating in the lower cylinder, a piston stem connecting the upper valve disk with the piston head, a coiled spring arranged within the upper cylindrical chamber and bearing against the said wings for urging the upper valve disk to its closed position, a lower check valve body se cured to the main valve body and having a liquid passage and a liquid conduit communicating with the liquid passage and arranged to deliver pressure to the lower valve disk and the piston head for opening the upper valve disk, a needle valve mounted in the lower check valve body and arranged to control the passage of liquid from the liquid passage to the liquid conduit for controlling the opening movement of the upper valve disk, and check valves for preventing counterflow of gas through the liquid passage and the liquid conduit.

10. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a main valve body having a gas outlet and a gas inlet and a passage connecting the same and provided with upper and lower cylindrical chambers and having valve seat rings mounted therein, an upper valve disk cooperating with the upper valve seat ring for opening and closing communication between the gas inlet and the gas outlet, said upper valve disk having wings guided in the upper cylindrical chamber, a lower valve disk cooperating with the lower valve seat ring and having a piston head operating in the lower cylinder, a piston stem connecting the upper valve disk with the piston head, a coiled spring arranged within the upper cylindrical chamber and bearing against the said wings for urging the upper valve disk to its closed position, a lower check valve body secured to the main, valve body and having a liquid passage and a liquid conduit communicating with the liquid passage and arranged to deliver pressure to the lower valve disk and the piston head for opening the upper valve disk, a needle valve for controlling the flow of liquid from the liquid passage to the liquid conduit for controlling the opening movement of the upper valve disk, said lower check valve body having a bypass communicating with the liquid passage and with the conduit at a point between the needle valve and the piston for permitting free flow 01' liquid from the piston to the liquid passage, and check valves for preventing counterfiow of gas through the liquid passage and the by-pass passage.

11. A pressure actuated suction stop valve for refrigeration systems having a suction line and a liquid line, said valve including a main valve body having a gas inlet and a gas outlet and a passage connecting the same and provided with upper and lower cylindrical chambers and having valve seat rings mounted therein, an upper valve disk cooperating with the upper valve seat ring tor opening and closing communication between the gas inlet and the gas outlet. said upper valve disk having wings guided in the upper cylindrical chamber, a lower valve disk cooperating with the lower valve seat ring and having a piston head operating in the lower cylinder, a piston stem connecting the upper valve disk with the piston head, a coiled spring arranged within the upper cylindrical chamber and bearing against the said wings for urging the upper valve disk to its closed position, a lower check valve body secured to the main valve body and having a liquid passage and a liquid conduit communicating with the liquid passage and arranged to deliver pressure to the lower valve disk and the piston head i'or opening the upper valve disk, a needle valve for controilingflieflowofliquidiromtheliquidpassage to the liquid conduit for controlling the opening movement or the upper valve disk. said lower check valve body having a by-pass communicating with the liquid passage and with the conduit at a point between the needle valve and the piston for permitting tree flow of liquid from the piston to the liquid passage. check valves for preventing counterflow of gas through the liquid passage and the by-pass passage, a stuliing box to:- the needle valve, and a bottom cap threaded on the end of the lower check valve body and covering the needle valve.

EAR-RY W. KEVIN.

CERTIFICATE OF CORRECTION Patent No. 2,165,800.

June 27, 1939.

HARRY W. NEVIN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1;,

ond column, line 20, strike out the reference numeral 10; line 23, for the word "row" read flow; and that the said Letters Patent should be read with this correction therein that the same may conform to'the record of the case in the Patent Office.

Signed and sealed this 15th day of August, A. D. 1959.

(Seal) Leslie Frazer Acting Commissioner of Patents.

cooperating with the upper valve seat ring tor opening and closing communication between the gas inlet and the gas outlet. said upper valve disk having wings guided in the upper cylindrical chamber, a lower valve disk cooperating with the lower valve seat ring and having a piston head operating in the lower cylinder, a piston stem connecting the upper valve disk with the piston head, a coiled spring arranged within the upper cylindrical chamber and bearing against the said wings for urging the upper valve disk to its closed position, a lower check valve body secured to the main valve body and having a liquid passage and a liquid conduit communicating with the liquid passage and arranged to deliver pressure to the lower valve disk and the piston head i'or opening the upper valve disk, a needle valve for controilingflieflowofliquidiromtheliquidpassage to the liquid conduit for controlling the opening movement or the upper valve disk. said lower check valve body having a by-pass communicating with the liquid passage and with the conduit at a point between the needle valve and the piston for permitting tree flow of liquid from the piston to the liquid 1: check valves for preventing counterflow of gas through the liquid passage and the by-pass e, a stuliing box to:- the needle valve, and a bottom cap threaded on the end of the lower check valve body and covering the needle valve.

EAR-RY W. KEVIN.

CERTIFICATE OF CORRECTION Patent No. 2,165,800.

June 27, 1939.

HARRY W. NEVIN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1;,

ond column, line 20, strike out the reference numeral 10; line 23, for the word "row" read flow; and that the said Letters Patent should be read with this correction therein that the same may conform to'the record of the case in the Patent Office.

Signed and sealed this 15th day of August, A. D. 1959.

(Seal) Leslie Frazer Acting Commissioner of Patents.

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