US1660842A

US1660842A - Expansion valve

Info

Publication number: US1660842A
Application number: US67776A
Authority: US
Inventors: Anthony F Hoesel
Original assignee: PEERLESS ICE MACHINE Co
Current assignee: PEERLESS ICE MACHINE Co
Priority date: 1925-11-09
Filing date: 1925-11-09
Publication date: 1928-02-28
Anticipated expiration: 1945-02-28

Description

A. F. HOESEL EXPANSION .VALVE Filed Nov. 9. 1925 Feb; 28, 1928.

mW/ NW7 Nw mm: 1 a m NW MNNN. a MN hm N Q RN. Mm Wm Patented Feb. 28, 1928.

UNITED STATES PATENT OFFICE.

ANTHONY F. HOESEL, OF CHICAGO, ILLINOIS, ASSIGNOR '10 PEERLESS ICE MAC-Hm] COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

EXPANSION VALVE.

Application filed November 9, 1925. Serial No. 67,776.

My invention relates, more particularly, to expansion valves for use in refrigerating systems to control the flow of the refrlgerating agent to the refrigerating coils, or the like.

My primary object is to provide an expansion valve whereby wire-cutting of the seat thereof producing erosion will be minimized and the valve operate automatically to regulate the flow of refrigerant therethrough when installed in apparatus having different rated capacities, and regardless of variations in operating capacities of the apparatus to which it is applied.

In explanation of the above referenceto Wire'cutting it may be stated that under the great differentials of pressure exlsting between. the low pressure and high pressure sides of a refrigerating apparatus, the con trol outlet of a single valve element provided to control the flow of the refrigerating agent to the refrigerating coil, is subjected to the action of the fluid flowing at a great velocity which produces erosion of the valve seatimpairing its function, it being understood that the greater the differential pressure the greater the velocity of the fluid and consequently the greater the erosion.

I minimized this objection, while maintaining the valve automatically controlled to cause it to properly function in. apparatuses of different rated capacities and apparatus wherein the operating capacities vary, by providing for multiple stage reduction of pressure, whereby the velocity of the fluid existing at the controllable outlets of the valve are greatly reduced, and automatically controlling the operation ofthe valve responsive to the building up of pressure in the low pressure side of the apparatus.

Referring to the accompanying drawing illustrating the preferred embodiment of my invention, the view therein shown represents my improved valve structure in vertical sectional elevation.

The particular construction of valve illustrated comprises a member 1 containing a chamber 2 into which an annular flange 3 of the member 1, depends, the top of this member containing an opening 4 within the confines of the flange 3; The member 1 contains a passage 5 which opens into the chamher 2 and which in practice would communicate withthe high pressure side of a refriga'pipe 6 screwed into a head 7 which contains a. passage 8 opening into the passage 5, p

the passage 8 having a valve seat 9 controlled by a manually controllable valve 10. The member 1 also contains a passage 11 opening upwardly through the top thereof as shown and communicating with the low pressure side of a refrigerating apparatus through the medium of a pipe 12 which opens through a passage 13 in a head 14, this passage containing a valve seat 15 controlled by a manually controllable valve 16.

Secured to the lower end of the member 1 at its chamber portion 2 is a hollow member 17, the recess 18 thereof forming a continuation of the chamber 2, this member being closed at its bottom except for a centrally located opening 19 in which a plug20 is screwed.

Screwed at its upper end into the flange 3 and against a gasket, is a valve casing 21 containing in its side wall inlets 22. Secured in the casing 21 in spaced relation to each other and both above the inlets 22, are tubes 23 and 24:, the opening through the tube 23 being of larger diameter than the opening through the tube 24, the lower edges of these tubes forming valve seats-25 and 26 with which reciprocable valves 27 and 28 cooperate, respectively. The valve 27 is provided with an upwardly extending stem 29 and at its lower end wit a guide member 30 shown as comprising radiating fins which slidingly fit the opening through the casing 21 and serve to properly guide the valve in its movements, the valve 27 being normally forced into tight engagement with the seat 25, by a coil spring 31 within the casing 21 and interposed between the member 30 and the tube 24:. The valve 28 is of the same construction as the valve 27, its upwardly extending stem being represented at 32, and its depending finned guide portion represented at 33. Acoil spring34 located in the casing 21 and interposed between the guide member 33 and the plug 20 operates to normally hold the valve 28 against the seat 26, the plug 20 permitting of the removal of valve 28' and spring 34, where desired, without removal of the casing 17.

The unseating of the valve 28, in the operation of the device is effected throughthe medium of the valve 27 in lowering, the

valve structure 27 however being normally s aced from the upper end of the stem 32 of tiie valve 28, when both of these valves are seated, to ensure closing of the valve 28, the valve 27 being spaced from the valve 28 only to such an extent as will insure the closing of the latter.

It will be understood from the foregomg that the high-pressure from the pipe 6 enters the chamber 2 and thence passes into the 1nterior of the valve casing 21 through the o enings 22 and out through this casing if t e valves 27 and 28 are in open condition, and to intercept foreign material which may be contained in the refrigerating agent, the nested

circular screens

35 and 36 are provided.

The valve structure described is controlled through the medium of diaphragm mechanism the position of which is controlled by the degree of pressure in the low pressure side of the apparatus. The diaphragm mechanism shown comprises a flexible diaphragm 37 located within a chamber 38 provided between the member 1 and a cover member 39 rigidly secured to the latter, the valve casing 21 and the passage 11 opening at their upper ends into this chamber, this diaphragm being held in place at its peripheral edge between the member 1 and the capmember 39 as by means of the screws 40. The diaphragm 37 is provided on its upper side with a disk 41 between which and a screw 42 vertically adjustable in the top of the cover 39, a coil spring 43 located within the cover member, extends, this spring operating to force the diaphragm 37 downwardly, the latter being provided at its underside with a disk 44 which slides within guides 45 and cooperates with the upper end of the stem 29.

,The operation of the mechanism is as fol-- lows: The screw 42 having been adjusted to cause the spring 43 to move the valves 27' and 28 to open condition, upon the accumu- 'lation of a predetermined amount of pressure in the low pressure side of the refrigerating apparatus, the dropping of such low pressure below the predetermined pressure will result in the lowering of the diaphragm A 37, which in lowering forces the valve 27 downwardly, out of engagement with its seat and by reason of the engagement of this valve with the valve stem 32 forces the valve 28 downwardly from its seat, whereupon pressure from the high pressure side of the apparatus flows upwardly through the differential restricted outlets of the valve structure and formed in the sleeves 24 and 23, thence passing into the chamber 38 and downwardly through the passage 11' to the low pressure side 12. As soon as the pressure in the low pressure side has been built up to the desired predetermined degree for which the tension of the spring 43 is set, the diaphragm 37 rises to the position shown in the drawing permitting both of the valves 27 and 28 to seat thereby closing the low pressure side to the high pressure side.

It will be understood that by providing the valve seats 26 and 25 to present different effective openings, the efl'ectiveopening atthe seat 25' being greater than at the seat 26, the pressure existing between the valve'seats 25 and 26 while less than the pressure in the high pressure side of the apparatus, is greater than the pressure in the low pressure side thereof, and thus the velocity of the refrigerant at both of these valve seats is greatly reduced compared with the velocity which occurs at the control outlet of a valve employing a single control outlet and erosion of the valve structure is thus minimized.

Furthermore, it will be noted that by con trolling the opening and closing of the valves 27 and 28 responsive to variations in the pressure in the low pressure side of the apparatus, as through the medium of the diaphragm mechanism shown and described, the valve when installed in refrigerating systems of different rated capacities, within certain limits, or when the operating capacities of the apparatuses vary, effect proper automatically regulated control of the flow of 1refrigerating agent to the refrigerating CO1 s. I

While I have illustrated and described aparticular construction embodying my invention, I do not wish to be understood as intending to limit it thereto, as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

1. Pressure-reducing valve mechanism comprising a casing containing a passage therethrough having valve seats of different effective openings, the valve seat of larger effective opening being nearest the outlet end of said passage, valves cooperating with said seats, and a single pressure-responsive device controlling the simultaneous movement of said valves, the effective openings of said seats being so proportioned that substantial back pressure exists in the portion of said passage between said valve openings of said seats being so proportioned thatsubstantial back pressure exists in the portion of said passage bet-ween said valve seats to effect multi-stage reduction of the pressure and velocity of the fluid flowing through said passage, and said valves being so arranged that pressure applied to one thereof by said device for moving it to 0 en position forces the other thereof open a er the initial movement of said first-referred to valve to open condition.

3. Pressure-reducing valve mechanism comprising a casing containing a passage theretln'ough havin valve seats of dlfi'ercnt, eflective openings, the valve seatof larger efi'ective opening being nearest the outlet end of said passage, normally self-closing, valves cooperating with said seats, and a single pressure-responsive device controlling the simultaneous movement of said valves, the eflective openings of said seats being so proportioned that substant1al back pressure exists in the portlon of said passage between said valve seats to effect multi-stage' reduction of the pressure and velocity of the fluid flowing through saidpassage. .4. In refrigerating apparatus, the combination with its low pressure conduit and high pressure conduit of valve mechanism controlling the flow oi fluid from: said high pressure conduit to said low pressure conduit comprising a casing containing a passage therethrough havingvalve seats of different eflective openings, the valve seat of lar er efl'eetive opening bein nearest the out et end ofsaid passage, va ves cooperating with said seats, and a single pressureresponsive device controlled by the pressure in said low pressure conduit and controlling the simultaneous movement of said valves,

the effective openings of said seats being'so proportioned that substantial back pressure exists in the portion of said passage between said valve seats to effect multl-stage reduction of the pressure and velocity of the fluid flowing through said passage to said low pressure'conduit.

ANTHONY F. HOESEL.