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counterbalance valve body 14 to seal between the body and the plate 36. N ' Returning now to the selector valve body 12, the port A4 thereof-isconnectedtotheportA2 ofthevalvebody 15 by another of the tubular connectors 25. The valve body 15 is supplied with an upwardly opening check valve 40 cooperating with a valve seat 41 on the upper end of a ?xed sleeve 42 in the same manner as the check valve 31a previously described with respect to the valve body 13. sure to the piston rod end of the cylinder 10, the routing of ?uid is as follows: ?uid from the pump 17 passes through conduit 18 into the’port A1 of relief valve body 11. Anyexcesspressureinconduit18willcausethevalve 19 to lift against the pressure of the spring 38 and the ex cess ?uid to bleed downwardly through the sleeve 21 and outwardly through the ports 68 therein and through the port B1 and conduit 22 to the sump. 3.. 4 The regulated pressure ?ows directly from the port A1 The A1 and B1 ports of the check valve body 15 are 10 of the relief valve body 11 through the port A3 thereof connectedtotheA3andB3ports,respectively,ofthe valve body 16 by another pair of the tubular connectors 25. Thelongitudinalpassageinthevalvehousing16is provided with a ?ow control valve comprising a sleeve 43 havingapluralityofsmallports44thereinadaptedtobe 15 valvebody12,the?uidenteringtheA1portwillpass brought more or less into register with the A ports by ro through the annulus between selector valve 24 and the tation of the sleeve 43 relative to the body 16 by means body 12, and between the bosses 66 and 67, and out ofathumbwheel46connectedthereto,andapluralityof 'wardlyfromtheB2portintotheB4portofthecheck larger ports 45 adapted to be in register with the B ports regardless of the orientation of the ports 44 relative to 20 theAports. Aslidespool47isslidablyreceivedwithin the sleeve 43 and is adapted to move downwardly to close theports44whenever?uidisenteringoneoftheBports, ,body14,butitcannotgetthroughtheresincetheB3port all in a manner well known in the art of ?ow control valves. TheportB4ofthe?owcontrolvalvebody16is connected to a conduit 48 through a suitable aperture 49 in an end plate 80, and another of the tubular members 25’isinsertedtherebetween. Theotherendofthecon duit 48 isconnected to the head end of the cylinder 10. The A4 and B4 ports of the body 14 and the A2 and 30 therethrough around the annulus between the heads of B2 ports of the body 11; the A4 port of the body 13 and the A2 port of the body 12; the A4 and B4 ports of the body 11 and the A2 and B2 ports of the body 16; and the B4 port of the body 12 and the B2 port of the body 15 are each connected by a cylindrical plug member 50 having two O-rings 51 thereon received within the coun terbore 27 around each of the ports. The cylindrical plugs 50 are exactly the same as the tubular connectors 25 previously described with the exception that there is no passageway therethrough. Similarly, all of the external ports A or B which are not connected to an external con duit are ?tted with cylindrical plugs 50’ and covered with end plates such as shown at 52. It will be noted that the plate 53 covering the front face of the relief valve body 11 is provided with apertures 54 and 55 in register with the A1 and B1 ports thereof to permit connection of the conduits 18 and 22, respectively, therewith. Blank end caps 56 are ?xed to'either end of the two check valve bodies 13 and 15 and to one end of the relief valvebody11. Theotherendofthereliefvalvebody 11 is closed by a cap 57 carrying the thumb screw adjuster 39. Thecap58ononeendofthecounterbalancevalve body 14 carries a stop to limit the upward movement of the valve 31 and the cap 59 on the other end thereof car riesthethumbscrewadjustment33. Thecap60onone end of the ?ow control body 16 is recessed at 61 to receive the one end of the sleeve 43 and the cap 62 on the other end thereof carries the thumb wheel adjuster 46 which intermesheswiththeotherendofthesleeve43. The cap 63 on one end of the selector valve body 12 is re cessed as at 64 to permit proper longitudinal movement of the selector valve 24, and the cap 65 on the other end thereof carries the manual control handle 28 which is con nected to the valve 24. the counterbalance valve 31 and out of the A1 port of the body 14, through the conduit 37 to the piston rod end of the cylinder 10. The ?uid returning from the head end of the cylinder 10 passes through the conduit 48 and enters the B4 port ofthe?owcontrolvalvebody16. The?uidthen?ows outwardly through the B3 port and enters the B1 port of the check valve body 15. The ?uid entering the B1 port of the body 15 unseats the check valve 40, flows upwardly through the body 15 and out of the A2 port into the A4 port of the selector valvebody12. Intheselectorvalvebodythe?uidenters above the boss 66, enters the hollow selector valvespool 24,'?ows downwardly therethrough to the area below the lower boss 67,0utwardly through the B1 port into the B3 port of the regulator valve body 11, around the sleeve 21, and out of the B1 port into the return conduit 22. When thehandle28 ismoved upwardly toitsintermedi ate position, the valve spool 24 of the selector valve moves downwardly until the bosses 66 and 67 thereon block the inner ends of the A1 and B1 ports, respectively, as shown in Fig. 4, and'prevent any ?ow to orfrom the cylinder10. When the handle 28 israised further, the bosses 66 and 67 move below the inner ends of the A1 and B1 ports and the pressure ?uid entering the A1 port isnow routed through the A4 port into the A2 port of the check valve body15. Sincethe?uidcannotpassdownwardlypastthe check valve 40, itleaves the A1 port of the body 15 and enterstheA3portofthe?owcontrolvalvebody16. The ?uid is metered through the variable opening ports 44 and passes downwardly through the sleeve 43, outwardly through the ports 45 and the B4 port of body 16 into con duit 48, and through the conduit 48 to the head end of the Theselectorvalvebody12isofthesameexternal'con 65 cylinder48. ?guration as the other valve bodies 11, 13, 14, 15 and .16 but the ports A and B thereof are inclined so that the in~ nerendsoftheportsA1,B1,A3andB3arebelowthe inner ends of the ports A2, B2, A4 and B4, respectively. The selector valve 24 is tubular and is provided with two 7 external bosses 66 and 67 which cooperate with the out of register inner ends of the various ports to provide proper routingofthe?uidbetweensaidports. The ?uid returning from the rod end of the cylinderv 10 returns through the conduit 37 to the A1 port of thc counterbalancevalvebody14. Sincethe?uid’cannot pass downwardly through check valve 31a of valve body 13, it cannot leave the body 14 by the A3 port therein, but must pass downwardly therethrough forcing the counterbalance valve 31 downwardly against the pressure of.thespring32untilthehead34‘clearstheBports. The Whentheselectorvalve24israisedfromtheposition’ ?uidthenpassesthroughtheB3portofthebody14into illustrated in Fig. 4 corresponding to the applying pres the B1 'port of the body 13, around the sleeve 29, out of a intotheportA1oftheselectorvalvebody12. Sincethe lower ends of bosses'66 and 67 in their raised position areabovetheinnerendsoftheA1andB1portsandbe low the inner ends of the A2 and B2 ports of the selector valve body 13. The ?uid entering the B4 port of the check valve body 13can?owthroughtheannulusaroundthelowerendof the sleeve 29 and out the B1 port into the B3 port of the of the body 14 is blocked by the head 34 on the counter balancevalve31. Instead,the?uidenteringtheB4port of the check valve body 13 enters the sleeve 29 through the ports 69 therein and forces the check valve 31a up wardly and ?ows outwardly through the A1 port into the A3 port of the counterbalance valve body 14 and directlyPDF Image | MULTIPLE VALVE ASSEMBLY
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