High-pressure fluid-flow system having compact two-bolt and four-bolt flanged and modular connectors

Abstract

A one-piece block connects flanged fluid-flow connectors. Each connector includes a central port and at least two tabs, the tabs having apertures for affixing the connector to the block. The dimensions of the block and the connector are such that the block can accommodate a given number of connectors in a smaller space than required in the prior art. Moreover, the maximum working pressure of the connector can still be as large as about 5000 psi. Channels formed within the block allow fluid communication from one connector to another.

1 . A one-piece, flanged, fluid-flow connector for connecting tube, pipe, hose or the like to a port face, said connector having an overall length L 1 , comprising: 
 a) a base having a height H, width W, a generally-flat port face mounting surface on one end, and a connection piece fixed to and extending from the other end of said base;    b) a plurality of mounting tabs fixed to and extending outwardly from said base, said tabs having a thickness T and an aperture extending therethrough;    c) a central, elongate, cylindrical channel extending lengthwise through said connector from a port on said mounting surface to a port on said connection piece, said port having a nominal diameter D 1  at said port face mounting surface,    said base having a maximum width W which is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518.    
     
     
         2 . The connector recited in  claim 1 , said width W being less than or equal to EE.  
     
     
         3 . The connector recited in  claim 1 , said base having a reinforcement portion, said connection piece contiguously formed with and extending from said reinforcement portion.  
     
     
         4 . The connector recited in  claim 3 , said reinforcement portion comprising a generally-conical extension intermediate said tabs and said connection piece.  
     
     
         5 . The connector recited in  claim 3 , said reinforcement portion comprising ribs intermediate said tabs and said connection piece.  
     
     
         6 . The connector recited in  claim 1 , said port face having an annular recess formed therein constructed and arranged to receive an “O”-ring to seal the connector on a desired port face.  
     
     
         7 . The connector recited in  claim 1 , said connection piece having means for interconnecting with a variety of elements such as a tube extension, hose, or pipe.  
     
     
         8 . The connector recited in  claim 7 , said connection piece having a variable length depending on the intended element to which the connector is attached.  
     
     
         9 . The connector recited in  claim 7 , said connection piece having a threaded outer surface for releasable interconnection with the desired tube, pipe, hose or the like.  
     
     
         10 . The connector recited in  claim 3 , including two tabs diametrically opposed from one another on opposed sides of said port.  
     
     
         11 . The connector recited in  claim 10 , said tab apertures being spaced apart a distance Z from one another.  
     
     
         12 . The connector recited in  claim 11 , said tabs having a spot face  34   a  surrounding said apertures on which the heads of fastening bolts are torqued.  
     
     
         13 . The connector recited in  claim 12 , said spot face comprising a cut-out in the reinforcement portion in the area proximate said apertures.  
     
     
         14 . The connector recited in  claim 11 , the dimensions being selected such that W is less than or equal to EE, D 1  is equal to A, and Z is equal to (Q 2 +GG 2 )½, wherein EE, A, Q, O and GG are defined in SAE standard J518.  
     
     
         15 . The connector recited in  claim 10 , said connector having nested horizontal and vertical port dimensions bb, cc, and dd corresponding to nested horizontal and vertical port dimensions BB, CC, and DD defined in SAE standard J518.  
     
     
         16 . The connector recited in  claim 15 , said dimension bb being at least 15% smaller than the dimension BB.  
     
     
         17 . The connector recited in  claim 15 , said dimension cc being smaller than the dimension CC.  
     
     
         18 . The connector recited in  claim 15 , said dimension dd being at least 20% smaller than the dimension DD.  
     
     
         19 . The connector recited in  claim 1 , including two pair of tabs diametrically opposed from one another on opposed sides of said port.  
     
     
         20 . The connector recited in  claim 19 , said connector having nested horizontal and vertical port dimensions bb, cc, and dd corresponding to nested horizontal and vertical port dimensions BB, CC, and DD defined in SAE standard J518.  
     
     
         21 . The connector recited in  claim 20 , said dimension cc being smaller than the dimension CC.  
     
     
         22 . The connector recited in  claim 20 , said dimension dd being at least 20% smaller than the dimension DD.  
     
     
         23 . The connector recited in  claim 1 , said connection piece being bent to change the direction of fluid flow.  
     
     
         24 . A one-piece, block, fluid-flow connector for connecting flanged, fluid-flow connectors, said block connector having: 
 a) a plurality of mounting surfaces, each mounting surface having a width W and a height H;    b) a fluid-flow channel extending from one mounting surface to each of the other mounting surfaces, said channel having ports on each mounting surface, each of said ports having a nominal diameter at said mounting surfaces;    c) a plurality of bores on each mounting surface for fastening the flanged connector to said mounting surface,    wherein the width W 1  of a first mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to the nominal port diameter D 1  on said first mounting surface; and,    said connector having a working pressure rating on said first mounting surface greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         25 . The connector recited in  claim 24 , said width W 1  being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         26 . The connector recited in  claim 25 , said height H being less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         27 . The connector recited in  claim 26 , said fluid-flow channel having an Elbow, Tee, or Cross shape.  
     
     
         28 . The connector recited in  claim 24 , including a second mounting surface having a width W 2  which is less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to the nominal port diameter D 2  on said second mounting surface; 
 said connector having a working pressure rating on said second mounting surface greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to the nominal diameter D 2 .  
 
     
     
         29 . The connector recited in  claim 24 , including a third mounting surface having a width W 3  which is less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 3  on said third mounting surface; 
 said connector having a working pressure rating on said third mounting surface greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to the nominal diameter D 3 .  
 
     
     
         30 . The connector recited in  claim 24 , including a fourth mounting surface having a width W 4  which is less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 4  on said fourth mounting surface; 
 said connector having a working pressure rating on said fourth mounting surface greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to the nominal diameter D 4 .  
 
     
     
         31 . The connector recited in  claim 25 , having at least one mounting surface with multiple fluid flow ports thereon, each of said ports being connected to said fluid-flow-channel.  
     
     
         32 . The connector recited in  claim 31 , the centers of said multiple ports being spaced apart a distance dd wherein dd is less than the dimension FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         33 . The connector recited in  claim 32 , wherein dd is less than or equal to EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         34 . The connector recited in  claim 33 , said multiple port mounting surface having a width W 2  less than or equal to n times EE.  
     
     
         35 . The connector recited in  claim 34 , having more than one mounting surface with multiple fluid flow ports thereon.  
     
     
         36 . The connector recited in  claim 25 , having more than one mounting surface with multiple (n) ports thereon, each of said ports being connected to an independent (unconnected) fluid flow channel extending from one multiple port mounting surface to another.  
     
     
         37 . The connector recited in  claim 36 , said multiple ports being spaced apart a distance dd wherein dd is equal to the dimension O specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         38 . The connector recited in  claim 37 , wherein dd is less than FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         39 . The connector recited in  claim 38 , wherein dd is less than or equal to EE.  
     
     
         40 . The connector recited in  claim 39 , said multiple port mounting surfaces having a width W 2  less than or equal to n times the dimension O specified in SAE standard J518 corresponding to said nominal port diameter.  
     
     
         41 . The connector recited in  claim 40 , said multiple port surfaces having a width W 2  less than or equal to n times EE.  
     
     
         42 . A stackable, one-piece, block, fluid-flow connector for connecting flanged connectors to a port face, said stackable connector having: 
 a) a flange mounting surface, a port face mounting surface and a stacking surface opposite said port face mounting surface, each surface having a width W and a height H;    b) a fluid-flow channel extending from said port face mounting surface to at least one other mounting surface, said channel having ports on said port face mounting surface and said mounting surface, each of said ports having a nominal diameter at said port face mounting surfaces;    c) a plurality of threaded fastening bores on at least one mounting surface for fastening the flanged connector to said mounting surface,    d) a plurality of through bores extending from said stacking surface to said port face mounting surface,    wherein the width W 1  of a first flange mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to the nominal port diameter D 1  on said first mounting surface; and,    said connector having a working pressure rating on said first flange mounting surface greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         43 . The connector recited in  claim 42 , said width W 1  being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         44 . The connector recited in  claim 43 , each through bore having a counterbore in the stacking surface.  
     
     
         45 . The connector recited in  claim 43 , said flange mounting surfaces having a height H less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         46 . The connector recited in  claim 43 , said fluid-flow channel having an Elbow, Tee, or Cross shape.  
     
     
         47 . The connector recited in  claim 43 , including an annular recess formed in the port face mounting surface proximate said fluid-flow port.  
     
     
         48 . The connector recited in  claim 43 , said stacking surface including and a plurality of threaded bores.  
     
     
         49 . The connector recited in  claim 43 , including two opposed flange mounting surfaces having a width W 2  less than or equal to EE.  
     
     
         50 . The connector recited in  claim 43 , having at least one mounting surface with multiple (n) fluid-flow ports thereon, each of said ports being connected to said fluid-flow channel.  
     
     
         51 . The connector recited in  claim 48 , the centers of said multiple ports being spaced apart a distance dd wherein dd is less than FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         52 . The connector recited in  claim 51 , wherein dd is less than or equal to EE specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         53 . The connector recited in  claim 52 , said multiple port mounting surface having a width W 2  less than or equal to n times dd.  
     
     
         54 . A one-piece, 180-degree flow turn around connector, comprising: 
 a) a single mounting surface having a width W and a height H;    b) an input and output fluid-flow port on said mounting surface, and a 180-degree fluid-flow channel connecting said input and output ports, said ports having a nominal diameter D 1  at said mounting surface;    c) a plurality of through bores in said mounting surface,    wherein the width W of said mounting surface is less than twice the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         55 . The connector recited in  claim 54 , said width W being less than or equal to twice the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         56 . The connector recited in  claim 55 , said height H being less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         57 . The connector recited in  claim 55 , including an annular recess formed in the port face mounting surface proximate each fluid-flow port.  
     
     
         58 . The connector recited in  claim 57 , the centers of said ports being separated by a distance dd wherein dd is less than or equal to FF specified in SAE standard J518 corresponding to said nominal port diameter.  
     
     
         59 . The connector recited in  claim 58 , wherein dd is less than or equal to EE.  
     
     
         60 . A one-piece, 90-degree divide/combine flow connector, comprising: 
 a) a flange mounting surface having a width W, a height H, and a single port having a nominal diameter D 1  at said first mounting surface;    b) a port face mounting surface having a height H and two ports having a nominal diameter D 1  at said port face mounting surface, the center of said ports being spaced apart from one another a widthwise distance dd;    c) a fluid-flow channel connecting said ports,    d) a plurality of through bores in said port face mounting surface;    e) a plurality of threaded bores on said flange mounting surface,    wherein the width W of said flange mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         61 . The connector recited in  claim 60 , said width W being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         62 . The connector recited in  claim 61 , said height H being equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         63 . The connector recited in  claim 61 , including an annular recess formed in the port face mounting surface proximate each fluid-flow port.  
     
     
         64 . The connector recited in  claim 61 , wherein the width dd is less than to the width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 .  
     
     
         65 . The connector recited in  claim 64 , wherein the width dd is at least 20% smaller than the width FF.  
     
     
         66 . The connector recited in  claim 64 , wherein the width dd is less than or equal to EE.  
     
     
         67 . A one-piece, in-line divide/combine flow connector, comprising: 
 a) a flange mounting surface having a width W, a height H, and a single port having a nominal diameter D 1  at said first mounting surface;    b) a port face mounting surface having a height H and two ports having a nominal diameter D 1  at said port face mounting surface, the center of said ports being spaced apart from one another a widthwise distance dd;    c) a fluid-flow channel connecting said ports,    d) a plurality of through bores on said port face mounting surface;    e) a plurality of threaded bores on said flange mounting surface,    wherein the width dd is less than or equal to 1-⅓ times EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         68 . The connector recited in  claim 67 , said height H being equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 .  
     
     
         69 . The connector recited in  claim 67 , including an annular recess formed in the port face mounting surface proximate each fluid-flow port.  
     
     
         70 . A compact, fluid-flow connection system for connecting tube, pipe, hose or the like to a port face, said system comprising a flanged connector and a block connector, said flanged connector having: 
 a) a base having a height HF, width WF, a generally-flat port face mounting surface on one end, and a connection piece fixed to and extending from the other end of said base;    b) a plurality of mounting tabs fixed to and extending outwardly from said base, said tabs having a thickness T and an aperture extending therethrough;    c) a central, elongate, cylindrical channel extending lengthwise through said connector from a port on said mounting surface to a port on said connection piece, said port having a nominal diameter D 1  at said port face mounting surface,    said base having a maximum width WF which is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518, said block connector having:    a) a plurality of mounting surfaces, each mounting surface having a width WB and a height HB;    b) a fluid-flow channel extending from one mounting surface to each of the other mounting surfaces, said channel having ports on each mounting surface, said ports having a nominal diameter D 1  at said mounting surfaces;    c) a plurality of bores on each mounting surface for fastening the flanged connector to said mounting surface,    wherein the width WB of at least one mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal-port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         71 . The system recited in  claim 70 , said flange width WF being less than or equal to EE; 
 said flange base having a reinforcement portion, said connection piece contiguously formed with and extending from said reinforcement portion;    said reinforcement portion comprising a generally-conical extension intermediate said tabs and said connection piece or ribs intermediate said tabs and said connection piece;    said flange connector port face having an annular recess formed therein constructed and arranged to receive an “O”-ring to seal the connector on a desired port face;    said connection piece having means for interconnecting with a variety of elements such as a tube extension, hose, or pipe;    said connection piece having a variable length depending on the intended element to which the connector is attached;    said connection piece having a threaded outer surface for releasable interconnection with the desired tube, pipe, hose or the like;    said flange connector including two tabs diametrically opposed from one another on opposed sides of said port;    said tab apertures being spaced apart a distance Z from one another;    said tabs having a spot face surrounding said apertures on which the heads of fastening bolts are torqued;    said spot face comprising a cut-out in the reinforcement portion in the area proximate said apertures;    the dimensions being selected such that WF is less than or equal to EE, D 1  is equal to A, HF is equal to O and Z is equal to (Q 2 +GG 2 )½, wherein EE, A, Q, O and GG are defined in SAE standard J518;    said connector having nested horizontal and vertical port dimensions bb, cc, and dd corresponding to nested horizontal and vertical port dimensions BB, CC, and DD defined in SAE standard J518;    said dimension bb being at least 15% smaller than the dimension BB;    said dimension cc being smaller than the dimension CC; and    said dimension dd being at least 20% smaller than the dimension DD.    
     
     
         72 . The system recited in  claim 71 , said block width WB being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; 
 said block height HB being less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 ;    said block fluid-flow channel having an Elbow, Tee, or Cross shape;    including two block mounting surfaces having a width W 1 , W 2 , respectively, each of which is less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 .    
     
     
         73 . The system recited in  claim 72 , 
 said block connector having at least one mounting surface with multiple fluid flow ports thereon, each of said ports being connected to said fluid-flow-channel;    the centers of said multiple ports being spaced apart a distance dd wherein dd is less than or equal to EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and    said multiple port mounting surface having a width W 2  less than or equal to n times EE.    
     
     
         74 . The system recited in  claim 72 , said block connector having more than one mounting surface with multiple (n) ports thereon, each of said ports being connected to an independent (unconnected) fluid flow channel extending from one multiple port mounting surface to another; 
 said multiple ports being spaced apart a distance dd wherein dd is less than or equal to EE; and    said multiple port mounting surfaces having a width W 2  less than or equal to n times the dimension EE specified in SAE standard J518 corresponding to said nominal port diameter.    
     
     
         75 . The system recited in  claim 70 , including a stackable, one-piece, block, fluid-flow connector for connecting flanged connectors to a port face, said stackable connector having: 
 a) a flange mounting surface, a port face mounting surface and a stacking surface opposite said port face mounting surface, each surface having a width WS and a height HS;    b) a fluid-flow channel extending from said port face mounting surface to at least one other mounting surface, said channel having ports on said port face mounting surface and said mounting surface, said port having a nominal diameter D 1  at said port face mounting surfaces;    c) a plurality of threaded fastening bores on at least one mounting surface for fastening the flanged connector to said mounting surface,    d) a plurality of through bores extending from said stacking surface to said port face mounting surface,    wherein the width WS of at least one flange mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         76 . The system recited in  claim 75 , said width WS being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; 
 each through bore having a counterbore in the stacking surface;    said flange mounting surfaces having a height HS less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 ;    said fluid-flow channel having an Elbow, Tee, or Cross shape;    including an annular recess formed in the port face mounting surface proximate said fluid-flow port;    said stacking surface including a plurality of threaded bores;    including two opposed flange mounting surfaces having a width WS 2  less than or equal to EE.    
     
     
         77 . The system recited in  claim 75 , including a one-piece, 180-degree flow turn around connector, comprising: 
 a) a single mounting surface having a width WT and a height HT;    b) an input and output fluid-flow port on said mounting surface, and a 180-degree fluid-flow channel connecting said input and output ports, said ports having a nominal diameter D 1  at said mounting surface;    c) a plurality of through bores in said mounting surface,    wherein the width WT of said mounting surface is less than twice the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         78 . The system recited in  claim 77 , said width WT being less than or equal to twice the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; 
 said height HT being less than or equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 ;    including an annular recess formed in the port face mounting surface proximate each fluid-flow port;    the centers of said ports being separated by a distance dd wherein dd wherein dd is less than or equal to EE specified in SAE standard J518 corresponding to said nominal port diameter;    
     
     
         79 . The system recited in  claim 75 , including a one-piece, 90-degree divide/combine flow connector, comprising: 
 a) a flange mounting surface having a width WD, a height HD, and a single port having a nominal diameter D 1  at said first mounting surface;    b) a port face mounting surface having a height HD and two ports having a nominal diameter D 1  at said port face mounting surface, the center of said ports being spaced apart from one another a widthwise distance dd;    c) a fluid-flow channel connecting said ports,    d) a plurality of through bores in said port face mounting surface;    e) a plurality of threaded bores on said flange mounting surface,    wherein the width WD of said flange mounting surface is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         80 . The system recited in  claim 79 , said width WD being less than or equal to the minimum pad width EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; 
 said height HD being equal to the dimension O specified in SAE standard J518 corresponding to said nominal diameter D 1 ;    including an annular recess formed in the port face mounting surface proximate each fluid-flow port.    wherein the width dd is less than or equal to EE FF specified in SAE standard J518 corresponding to said nominal port diameter D 1 .    
     
     
         81 . The system recited in  claim 75 , including a one-piece, in-line divide/combine flow connector, comprising: 
 a) a flange mounting surface having a width WE, a height HE, and a single port having a nominal diameter D 1  at said first mounting surface;    b) a port face mounting surface having a height HE and two ports having a nominal diameter D 1  at said port face mounting surface, the center of said ports being spaced apart from one another a widthwise distance dd;    c) a fluid-flow channel connecting said ports,    d) a plurality of through bores on said port face mounting surface;    e) a plurality of threaded bores on said flange mounting surface,    wherein the width dd is less than or equal to 1-⅓ times EE specified in SAE standard J518 corresponding to said nominal port diameter D 1 ; and,    said connector having a working pressure rating greater than or equal to the working pressure rating specified in SAE standard J518 corresponding to said nominal diameter D 1 .    
     
     
         82 . A one-piece, flanged, fluid-flow connector for connecting tube, pipe, hose or the like to a port face, said connector having an overall length L 1 , comprising: 
 a) a base having a height H, width W, a generally-flat port face mounting surface on one end, and a connection piece fixed to and extending from the other end of said base;    b) a plurality of mounting tabs fixed to and extending outwardly from said base, said tabs having a thickness T and an aperture extending therethrough;    c) a central, elongate, cylindrical channel extending lengthwise through said connector from a port on said mounting surface to a port on said connection piece, said port having a nominal diameter D 1  at said port face mounting surface,      1 said base having a maximum width W which is less than the recommended pad width FF specified in SAE standard J518 corresponding to said nominal port diaveter D 1 .