US2756910A - Drum drainage control unit - Google Patents

Description

y 1956 J. R. SNYDER 2,756,910

. DRUM DRAINAGE CONTROL UNIT Filed Feb. 15, 195:5 2 Sheets-Sheet 1 July 31, 1956 J. R. SNYDER 2,756,910

DRUM DRAINAGE CONTROL UNIT Filed Feb. 13, 1953 2 Sheets-Sheet 2 12 7 v5.27 tar 2,756,910 I DRUM DRAINAGE CONTROL UNIT Jacob Rush Snyder, Cleveland, Ohio, assignor to Thompson Products, Inc., Cleveland; Ohio, a corporation of Ohio Application February 13, 1953, Serial No. 336,735

21 Claims; c1; 222+4s4 This invention relates generally to drum drainage'cone trol units and more particularly relates to adrainage unit having a manually operated valve provided with. a

separate open ended vent passage shut at one end by a.

self-collapsing flapper type check valve and including a supplemental valve controlling the vent passage soithat the vent passage will be closed when themain drainage passage is closed and will be automatically opened whenever the drainage passage is opened, thereby insuring against leakage of anydrainage fluid into the vent pas-"5' ,..ceives a valvebody 18 inserted therein.

18 is provided with an annular peripheral groove 1 9"r e'- cei'ving a seal member 20 which can advantageously take sage.

wherein a pivoted latch arm cooperates with a manual actuating means for the main drainage valve and the supplementary vent passage valve provided in accord-f30 ance with the principles of the present invention to hold both of the valves closed or to hold both of the 'valves open, means being provided between the latch arm' and the manual actuating means so that a tampering indicating seal may be aflixedto the unit or a lock may be' at-" operation of tached to the unit to prevent unauthorized the drainage control unit.

It is an object of the present invention, therefore, to

provide a drainage control unit wherein a separate venting passageway is provided which is controlled by two' 4 separate valving means. I

Yet another object of the present invention is to provide a drainage control unit having improved tampering preventing means. Y

A further object of thepresent invention is to provide a valving arrangement for a drainage control unit which will maximize safety insurance against leakageofcor-"u The present invention further relates to a control-unit 2,756,910 Patented July 31, 1956 in the handling of particularly corrosive fluids such as rosive fluids such as acids into a venting passageway com-'1. municating with the exterior areas of the drainage unit. Many additional advantages, features and objects of" the present invention will become manifest to those versed in art upon making reference to the detailed description which follows and theaccompanying sheets of d ings in which a preferred structural embodimentofva' drum drainage control unit is shown by way of -illustra-* tive example.

On the drawings: Figure 1 is a fragmentary cross-sectional components in closed position; .i

Figure 2 is a fragmentary end elevational view viewof a" fluid carrying drum and a drum drainage control unit'- Y I cessed to receive an annular sealing gasket 36 which diof the drum valve drainage control unit of Figure '1';

Figure 3 is a fragmentary cross-sectional view with parts shown in elevation similar to the view shown in Figure 1 but depicting the valve components of the as sembly in open position to advantageously illustrate the operating characteristics of the structure provided in ac:

cordance with the principles of the present invention; v Figure 4 is a fragmentary end elevational view looking at the end of the control unitopposite the end shown in Figure 2.

acids and the like. With such fluids, it also becomes increasingly important to provide adequate insurance against tampering with a drum drainage control unit by unauthorized personnel.

3 According to the principles of the'present invention,

improved structural means are provided for achieving both of these objects and, accordingly, it will be understood that although the drum drainage control unit of the present invention and indicated on the drawings generally by the reference numeral 1 0 is of general utility,

a particularly useful application thereof is made in connection with a drum 11 which can be made of stainless steel or the like and which may be utilized to contain a particularly corrosive fluid such as an acid.'

The drum 11 is provided with a closure opening 12 surrounded by an offset flange 13 shaped to be cornplementary to a closure ring 14 having a threaded bore indicated at 16. p

A gland nut 17 is threaded into the bore 16 and re- The valve'body the form of an O-ring made of rubber or the like so as to provide a fluid tight'seal between the gland nut 17 and the valve body 18.

The valve body 18 is further provided with an annular groove 21 located adjacent the forward end thereof andreceiving a lock ring 22 which abuts against the end of the gland nut 17 and precludes relative axial displacement of the gland nut 17 in the valve body 18.

Anintermating recess 23 and flange 24 is provided between the other end of the gland nut 17 and the valve body 18 to limit inward movement of the valve body 18 with respect to the gland nut 17.

The interior of the valve body 18 is recessed to provide a drainage passageway 26. Additionally, the valve 18 is provided with an angled downspout 27 having a drainage passageway 28 extending therethrough and intersecting the drainage passageway 26 to form a continuation thereof. j

If it is desired to increase the rate of flow of the drainage control unit, the length of the downspout 27 can be increased by inserting a length of tubing 29 into the body 18 intersects one face of the valve body 18 indicated at 30, which face 30 is particularly characterized by the provision of a valve seat portion 31 cooperating I with a valve 32 provided to control the flow of drainage fiuid from the drum 11 into the drainage passageway 26 and through the drainage passageway '28.

The valve 32 more particularly comprises a valve head 33 having a radially outwardly extending flange 34 rerectly engages the valve seat portion 31 to close the drainage passageway 26.

The valve 32 is further provided with longitudinally extending guide portions 37 which engage the walls of the drainage passageway 26 in the valve body 18 to guide the valve 32 towards and away from the valve seat portion 31.

On one face of the flange 34 is provided an embossment 38 and an opening 39a is extended through the valve 32 including the embossment 38 so as to receive in firm assembly with the valve 32 an open ended tube 39 operable as a valve stem for the valve 32 and also providing a separate vent passageway 40 toadmit ventingafluid into the drum 11 upon egress of drainage fluid outwardly thereof.

The tube 39 extends exteriorly ofthe va1ve-body-18 and is slidably received in a bushing 41 carriedby the valve body 18 and utilized to securely seal-and lock to the valve body 18 one end of an annular flexible rolling diaphragm indicated at 42.

; The other end of the diaphragm 42 is secured to the tube 39, an annular recess 43 being provided in the peripheral surface of the tube 39 and receiving an annular rib 44 provided on the corresponding-end of the diaphragm '42. The rolling diaphragm 42 forms a leak proof seal betweenthe tube ;39, and the valve body 13 without imposing frictional resistance to. the reciprocablemovements of the tube relative tothe bushing 41.

'In order topreventthe ingressof drainage fluid from the drum 11 into the ventpassagewayx40, a flapper-type check valve 46 is provided .to.-surround .the embossment 38 formed on the flange 34 of the valve 32. The-check valve 46 preferablytakes the form of asleeve madeof a flexiblematerial and includinglopposed flat wall portions 47 which are self-collapsing andoperate. in awell-known manner to permit only unidirectional flow of a fluid therethrough.

A retaine r ring 448 is shown surrounding the other. end of the valve 46 and placing same in seal tight assembly with the embossment 38.

Shouldany drainage fluid, inadvertently leak. betweenthe. opposed wall portions 47 of the check valved-6 into the recesst49 at the end of the ventpassage40, it is highly desirable that such fluid be prevented from actuallypassing through the vent passageway 40 to the areas exterior of the valve body 18. Accordingly, in accordance with the principles of the present invention, a valve 50. is provided and is placed in control of the venting passageway 40. The valve 50 more particularly comprises a valve head 51 preferably taking the form of a disk of resilient material skived as at 52 and retained on the end ;f a valve stem 53 by a support disk 54 and a fastening member 56 extending-through the support member 54 into the stem 53.

The end of the tube 39 which extends interiorly of the drum 11 when the drainage unit is assembled onthe drum 11 terminates withinthe embossment, 38 and both the embossment 38 and theend of the tube 39 -;are shaped to provide a taperedseating surface cooperable with the skivecl portion 52 of the valve head 51.

The valve stem 53 extends through the vent passageway 4t), and carries a transversely extending pinv 57 adjacent the free end thereof.

Thepin 57.has its opposite ends extending through diametrically opposed slots. 58 formed in-the walls of the tube 39 adjacent the end thereof and into firm assemblyv with a knob shaped actuating handle 59 recessed as atfit) to receive the end of thetubelw. Thus, thehandle 59 islmovably mounted on the exteriorly extending end of the tube 39but is confined on the tube 391for.;limit ed movement relative thereto within the limits prescribed by the cooperation of the slots 58 and the transverselyextending pin 57. The slots58 are preferably arranged tov accommodate a suflicient movement of the handle 59 so thatthe valve 50 can be moved toward and away from theseatprovidedby the end of :the tube 39, thereby to, open and close the ventpassageway 49.

In order to provide a continuous biasingforce normally urging both the valve 32 and the valve 50 into closed position, a coil spring 61 is bottomed in an annular groove 62 formed in the bushing 41 and has its opposite end engaging a radially outwardly extending flange 63 formed on the handle 59. If it is desired to initiate drainage'of fluid from thedrum 11, the tube -3 is movedinwardly against the biasof the spring61 by engaging the handle 59 whereupon the valve 50 will be simultaneously'liftedw In order to insure adequate flow of venting fluid, an aper- --ture-64 is provided in--the wall of the tube 339 and the handle 59 is appropriately recessed as at 66 in the area adjacent the apertures 64.

In accordance with the principles of the invention, both of the valves 32 and may be locked open or locked closed by means of a latching mechanism indicated generally at 70. The latching mechanism includes a latch arm 71 pivoted at one end to a bracket'72 integral with the valve body 18..and, suitably apertured. to'receive a pivot pin 73. The other end of the latch arm'71 engages the flange 63 on the handle 59.

As will be evident upon referring to the drawings, in the preferred embodiment shown the latch arm 71 is an elongate memberandthe longitudinal axis thereof is arranged to be generally parallel to the axis of the tube 39 so that the latch arm 71 can be pivoted around the pivot pin 73 and substantially interposed between the handle 59 I and thezvalve body-18-toretain the'handle 59 in its outermost position relativeto the valve body 18 thereby locking both the :valve 30 and the valve 50 in the closed position shown in Figure 1.

The latch-arm 71 is provided with a flange 74 and the flanges .74 and63may be provided with registering aperturesindicatedon Figure 2 at 76. The apertures 76 receive a padlock so thatthe drainage control unit-ltlmay be secured;againstunauthorized operation. It will be further understood that atamper indicating seal could also be provided through the apertures 76 so as to reveal anytampering with the drainage control unit 10 by'unauthorized personnel.

The flange 63 on -the handle '59 isnotched as at 77 (Figure 2). and thelatch arm 71 is notched as at 78', thereby forming between=the handle*59- and the latch arm 71 confronting abutment shoulders indicated at 79 (Figure-3).

Aseshownin Figure 3, the notch '78 is provided in the latchzarrn' 171 .along the longitudinal axis thereof so that the engagementofthe abutment shoulder 79-will' retain the handle 59 against the bias of the spring 61 with both the valves .30 and-50 in 'open position.

In: operation, it will be'noted that the valve body'18 is rotatable with respect to the'gland'nut .17, thereby affording adjustable positioning of the downspout 27 in any desired 'clockwiseor counterclockwise position without necessitating the .use of tools such as wrenches-or the like and without opening up any portion of the drainage controlzunit 10 tor-leakage. This structural feature is -par- 'ticularly=-advantageous=if the apparatus is utilized for drawing viscous-fluidssince the downspout 27-may be turned upwardly 180 thereby automatically developing itsaowrr drip chamber and always assuring drip free area 7 adjacent-the drum '11.

.It-. may be also noted that the longitudinally extendingwportion 37 of the valve 32 is flanked on each'sid'e by ribs 80 (Figure. 4 thereby precluding inadvertent rotationrof the rolling diaphragm 42: which might occur if the valve :32. were rotatedwithin the valve body-18 by careless personnel.

supplemental'or auxiliaryvalve Silupon closing-of the valve 32 sinceisuch-imme'di'ate closing of the ventpassage- -way 40 operates-to create a degree of vacuum in the drum a 11 which will permit a reasonable expansion of: the fluid when exposedto any increase in; temperature without everpressurizing any 'air. :spaces :which may existwithin the '11. ;In o, ther=:words, the conventional air flow lag is, automatically shut ofi instantly when the valve 50 is closed and further atmospheric equalization is prevented.

"Although various minor structural modifications might be suggested by'those' versed in the art in connection with the preferred embodiment herein describedby way'of illustrative example; only, it should be appreciated that I wish to-embody within-the scope ofthepatent-warranted hereon I all's-uch modifications as reasonably and-:properlyi' come within the scope of my contribution tothe art. 1

I claim as my invention: 1. -In a drum drainage control unit, a valve body providing a drain passage and having a valve seat in said passage, a main valve carried by said body and controlling said passage, a vent passage through said valve separate from said drain passage and extending outside the valve body, a check valve controlling the direction of fluid flow through said vent passage, an auxiliary valve in said vent passage in series with said check valve, and actuating means connected to said auxiliaryvalve and having an operating connection with said mainvalve for opening said auxiliary valve upon actuation of said main valve. 2. A drum drainage control unit comprising, drain passage providing means, a main valve means carried thereby for selectively controlling the drainage of fluids therethrough, said valve means having formed thereon a separate open-ended vent passage,'a self-collapsing flapper type check valve carried by said valvemeans and checking passage of fluid in one direction through said said passage, and a supplemental valve carried bysaid valve and having actuatingmeans manually accessible from exteriorly thereof for selectively controlling the flow of fluid inboth directions through said vent passage and having an operating connection with said main valve means, whereby said vent passage will be closed whenever said main valve means is closed.

3. A drainage control unit, comprising, drain passage providing means carrying a valve havingla manually accessible actuator for selectively draining fluid therethrough, a vent tube extending through said valve and said actuator and providing a separate vent passage, a. flapper type check valve on said valve andcontrolling the flow of fluid through said tube, a supplemental valve seating ag'ainst said one end of said tube and having a stem extending through said tube towards the other end, and aseparate actuating handle connected to to selectively actuate said supplemental valve.

4. A drainage control unit, comprising, avalve body providing a drain passage, a valve carriedby said body and controlling drainage through said passage, a tube ex-. tending through said valve and having a portion extendingexteriorly of said vbody to provide a'separate vent passage, said tube .being movable relativeto said body to "control the positioning of said valve, a flapper type check valve on said valve checking entry of drainage fluid into said vent passage, a second valve seated on one end of said tube and having a stem extending through said tube, a seal means between said tube and said valve body,

afslot'formed in opposite sides of said tube adjacent the] exteriorly extending end of said tube, a transverse pin.

engaging said stem and confined in said slots to limit the movement of said second valve and stem relativeto said tube, a knob having a recess receiving the exteriorly extending end of said tube and connected to said pin, continuous biasing means between said body and said knob normally tending, to close said valve and said second valve, and a latch arm having one end thereof pivotally carried by said body and having the other end thereof selectively'enga'ging said knob to lock said valves closed, said latch arm and said. knob having means providing registering apertures for receiving tampering preventing means, said latch andjsaid knob further including spaced confronting shoulders selectively engaging one another to-"i'etain said knob and said tube inwardly against the. continuous bias for locking the valves open.

"'5; "A'drainage control unit, comprising, a valve body providing a drain passage, a valve carried by said body and controlling drainage through said passage, a tube extending through said valve and having a portion extendingexteriorlyeofsaid body'to provide a separate vent' passa'ge, said tube being movable relative to said bo' dyto control thejipositioningfof said valve, aflappen eheck 'valyeon said valye'checking entry of drainage said stem.

fluid into said vent passage, a'second'valve seated on one end of said tube and having a stem extending through said tube, a seal means between said tube and said valve body, a slot formed in opposite sides of said tube adjasaid pin, continuous-biasing means between said body and said knob normally tending to close said valve and said second valve, and a latch arm having one end thereof pivotally carried by-said body and having the other end thereof selectively engaging said knob to lock said valves closed, said latch arm and said knob having means providing registering apertures for receiving tampering preventing means.

6. A drainage control unit, comprising, a valve body providing a drain passage, a valve carried by said body and controllingdrainage through said passage, a tube extending through said valve and having a portion extending exteriorly of said body to provide a separate vent passage, said tube being movable relative tosaid body to control the positioning of said valve, a flapper type check valve on said valve checking entry of drainage fluid into said vent passage, a second valve seated on one end of: said tube and having a stem extending through said tube, a seal means between said tube and said valve body, a slot formed in opposite sides of said tube adjacent the exteriorly extending end of said tube, a transverse pin" engaging said stem and confined in said slots to limit the movementof said second valve and stem relative to saidtube, a knob having a recess receiving the exteriorly extendingend of said tube and connected to said pin, con-' tinuous biasing means between said body and said knob. normally tending to closesaid valve andsaid second valve,

anda latch arm having one end thereof pivotally carried by said body and having the other end thereof selectively engaging said knob to lock said valves closed.

7. In combination, a drum head having a gland nut providing a closure opening, and a drum valve drainage unit having a valve body rotatably received in said gland nut, sealing. means between said valve body and said gland nut, a downspout connected to said valve body and together with said body providing an angled drainage pas sageway, said body being adjustably positioned in said gland nut to selectively angularly align said downspout,

said valve body having a valveseat at one end of said passageway, a valve engaging said seat and having a stem extending exteriorly of said valve body into a manually accessible location, said stem comprising an open ended tube extending through said valve to provide a separate venting passageway, a rolling diaphragm forming a leak proof seal between the valvebody and the stem without imposing frictional resistance to the movement of said stem relative to said valve body, an actuating handle movably mounted onthe exteriorly extending end of said tube, a second valve seated on the other end of said tube and controlling said venting passageway, a second stem for said second valve, means connecting said second ster'n and said actuating handle and confining said handle'on said tube for limited movement relative thereto sufiicient to lift said second valve and continuous biasing means between said valve body and said handle urging both of said valves closed. g 8. In combination, a drum head having a gland nut providing a closure opening, and a drum valve drainage unit having a valve body rotatablyreceived in said gland' nut, sealing means between said valve body and 'said gland-nut, a downspout connected to said valve body and passageway, a valve engaging said seat and having a" stemiextending-i exteriorly 'ofsaid' valve body into amanually :accessible: location, said stem comprising an" open ended itubeuextending through said valve -to provide a separate ventingpassageway, a rolling diaphragm forming a: leakprooftseal between theva-lve body and the stem without imposing frictional resistance to the move ment of said stem:relative to said valve-body,'an actuating handle .movably'. mounted onthe exteriorly extending :endtof said .tube, a second valve seated on the other endof said tube and controlling said venting passageway, asecond stem'for said second valve, means connecting'said second stem and said actuating handle-and confining saidhandle on: said tube for limited *movemcnt relativethereto sufficient to lift said second valve, continuous biasing means-betweensaid Valvebodyzind said handle urging both of said valves closed, and a flapper type check valve enclosing said other end of said tube and checkingiflowi of: drainage fluid into-said vent passageway.

9.4111: combination, a drum head-having a-gland nut providing a closure 'opening,.and adrum zvalvedrainage unit having a valve body'rotatably received in said gland nut, sealing means between said valve body and said gland nut, a downspout connected to said valve'body and together with said body providing an angled drainage passageway,'said body being adjustably positioned in said gland nut'to selectively angularly align said downspout, said valve body having a valve seata-t one end of said passageway, a valve engaging said-seat and having 'a stem extending exteriorly of said valve body into amanually accessible location, said stem comprising an open-ended tube extending through saidvalve to provide a separate venting passageway, a rolling diaphragm forming a leak proof seal betweenthe valve body and the stem'without imposing frictional resistance to the movement of'said stem relative to said valve body,an actuating handle mov ablymounted on the exteriorly extending end of said tube, a second valve seated on the other end of said tube and controlling said venting passageway, a second stem for said second'valve, means connecting said second stem and said actuating handle and confining said handle on said tube for limited movement relative thereto suflicient to liftsaid second valve, continuous biasing means betweensaid valve body and said handle urging both of said valves closed, and a latch arm between said valve body and said actuating handle retaining both of said valves in closed position.

110. In combination, adrumhead having a gland nut providing a closure-opening, and a drum valve drainage unit having avalvc body rotatably received in said gland nut, sealing means between said valve body and said gland nut, a downspout connected to said valve body and together with said body providing an angled dra'inage'passageway, said body being adjustably positioned in said glandnut'to selectively angularly align said downspout, said valve body having a valve seat at oneend of said'passageway, a valve engaging said seat and having astern extendingexteriorly of said valve body into a manually accessible location, said stem comprising an openended tube extending through said valve to provide 7 a separate venting passageway, a rolling diaphragm forming a leak proof seal between the valve body and the stern without imposing frictional resistance to the movement of said stem relative to said valve body, an actuating handle movably mounted on the exteriorly'extendingend of. said-tube, asecond valve seated on the other end of said tubeand controlling said venting passageway, a second stem for said'second valve, means connectingsaid second stem and said actuating. handle and confining said handle on'said tubefor limited movement relative thereto sufi'icient to lift saidssecond valve, continuous biasing means'between said valveibody and said handle urging both of-said valves closed, and a latch arm between said valve body and said actuating handle retaining both of said valves ;in closedtposition, said latch armand said handle havingxmeansprovidingregisteringapertures-for ing a' stem 'exte'ndingexteriorly of said valve body into amanuallyaccessiblelocation, said stem comprising an open ended tube extending through said valve to provide a separate venting passageway, a rolling diaphragm forming a leak proofseal between the valve body and the stem'without imposing-frictional resistance tothe movement of said stem relative to'said'valve body, an actuating handle' movably mounted on 'the exteriorly extending end of saidtube, a second valvc'seated on the other end of said tube and controlling said venting passageway, a second stem for said second valve, means connectingsaid second stem and said actuating handle and confining said handle on said tube for'limited movement'relativethereto sufiicient to lift said second valve, continuous biasingmeans between said valve body and said handle urging both of said valves closed, and a latch arm between saidvalve body and said actuating handle'retaining both of said valves in closed position, said"latch-armandsaid handle being relatively displaceable and further including-cooperatingabutment shoulders movableintoengagement with one another to retain said valves'in open position.

12. Imco'nibination, a drum head having a gland nut providing a closure opening, and a drum valve drainage unit having a valve body rotatably received in said gland nutysealingmeans between said valve body and :said gland nut, a downspout connected to said valveibody and together ,with said' body providing an angled drainage passageway, said body being adjustably positioned in said gland nut to selectively angularly alignsaid downspout, said valve body having a valve seat atone end of said passageway, a valve engaging said seat and having a stem extending exteriorly of said valve body, into a manually accessible location, said stem comprisingtan open ended tube extending through said valve to provide a separate venting passageway, a rolling diaphragm forming a leakproof seal between .the valve body and 'the stem without imposing frictional resistance to the movement of said stem relative to saidivalve body, an actuating handle movably mounted on the exteriorly, extending end of said tube, a second valve seated on the other end of said tube and controlling said venting passageway, a second-stem for, said second valve, means connecting said second stem and said actuating; handle and confining said handle on said tube .for limited move-.

ment relative thereto sufficient to lift said second valve, continuous biasing means between said valve body: and

said handle urging both of saidvalves closed, and a; latch arm between said valve body and said actuating handle retaining bothof said valves in closed position, said latch arm and said handle having means providing registering apertures for receiving a tampering preventing lock, said latch, armand said handle being relatively displaceable and further including cooperating abutment shoulders,- movablev into engagement with one another to retain saidvalves in open position.

13. In a drainage unit, a. valve body having a drain passage, a valve controlling said passage, a stem connected to saidvalve and extending exteriorly of said valve body, a. spring between said stern and. said body biasing said valve closed, a latch arm pivoted at one end'to said body and having .thefother end thereof engaging said stem to lock said valve closed, said latch arm and said stem including means providing registering apertures for receiving a tampering preventing lock, said latch arm and said stem further including cooperating abutment shoulders movable into engagement with one another to hold said valve open.

14. A drainage unit, comprising, a gland nut providing a closure opening for a drum, a valve body having a drain passage and a downspout communicating therewith rotatably received in said gland nut, retainer means between said nut and said valve body precluding withdrawal of said body from said nut, said nut and said valve body providing confronting annular circumferentially extending bearing surfaces, one of said surfaces having an annular groove formed therein, and a seal ring between said nut and said valve body confined in said groove at said bearing surfaces, said downspout being selectively angularly aligned in said gland nut to develop its own drip chamber.

15. A drainage control unit, comprising, drain passage providing means carrying a main drain valve having a manually accessible actuator for selectively draining fluid therethrough, a vent tube extending through said main drain valve and said actuator and providing a separate vent passage, a check valve on said vent tube and controlling the flow of fluid through said tube, a supplemental valve seating against said one end of said tube and having a stem extending through said tube towards the other end, single means providing both a lost motion connection between said manually accessible actuator and said main drain valve and a direct connection between said actuator and said supplemental valve for sequentially actuating first said supplemental valve and then both said main drain and supplemental valves.

16. A drainage control unit, comprising means providing a main drain passage, means providing a venting passage, a main valve controlling said main drain passage, a check valve controlling said venting passage, and a supplemental valve for said vent passage in series with said check valve, and a spring bias manually accessible valve actuator connected to said supplemental valve and having a lost motion connection with said main valve to open both said main and supplemental valves and to positively close the venting passage when the main drain passage is closed.

17. A drainage control unit, comprising inner and outer means shaped to provide concentrically aligned venting and main flow passages, said inner means forming a main valve for said main flow passage, 21 check valve for said venting passage, a supplemental valve in series with said check valve, an actuator for said 10 supplemental valve and having a lost motion connection with said inner means to concurrently lift said main valve when said supplemental valve is opened and to close said supplemental valve in said venting passage whenever said main flow passage is closed.

18. In a drainage unit, a valve body having a drain passage, a valve controlling said passage, a stem connected to said valve and extending exteriorly of said valve body, a handle extending radially outwardly on the end of said stem, :1 spring acting between said stem and said body biasing said valve closed, a latch arm pivoted at one end to said body and having the other end thereof extending longitudinally generally parallel to said stem when pivoted to a position interposed between said handle and said valve body, thereby to engage said handle to lock said valve closed, said latch arm having a flange and said handle including means together providing registering apertures for receiving a tampering preventing lock.

19. In a drainage unit as defined in claim 18, said handle being notched and said latch arm being notched along the longitudinal axis thereof to provide cooperating abutment shoulders retaining said handle against the bias of said spring with said valve open.

20. A drainage control unit as defined in claim 15, a spring acting on said actuator to normally bias said main drain valve closed, a latch arm pivoted at one end to said drain passage providing means for movement into interposed relation against said actuator, thereby engaging said actuator and holding both of said supplemental and main drain valves closed.

21. A drainage control ,unit as defined in claim 20, said actuator being notched and said latch arm being notched along the longitudinal axis thereof to provide cooperating abutment shoulders retaining the actuator against the bias of said spring to hold both said supplemental and main drain valves open.

References Cited in the file of this patent UNITED STATES PATENTS 553,389 Brower Jan. 21, 1896 679,201 Allison et a1 July 23, 1901 948,647 Frisholm Feb. 8, 1910 1,877,197 Price et al Sept. 13, 1932 2,030,510 Griffiths Feb. 11, 1936 2,518,349 McCabe Aug. 8, 1950 2,539,349 Giles Jan. 23, 1951 FOREIGN PATENTS 428,402 Germany Oct. 18, 1924 293,622 Great Britain July 12, 1928

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