US1658324A

US1658324A - Check valve

Info

Publication number: US1658324A
Authority: US
Inventors: Fred W Bonitz
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-07-01
Filing date: 1927-07-01
Publication date: 1928-02-07
Anticipated expiration: 1945-02-07

Description

Feb. 7, 1928. 1,658,324

F. w. BONITZ CHECK VALVE Filed July 1, 1927 Patented F cl). 7, 1928.

UNITED. STATES FRED W. BONI'IZ, T MOTH-E, NORTH CAROLINA.

CHICK VAINTI.

Application fled July 1, 1927. 80111180. 808,857.

My invention relates to check valves mainly intended for use in storage tanks for oils or other liquids but it has also its application in connection with fluid pressure containers such as air brakes on railroad trains and the like.

The main object ofmy invention is to provide a valve of this class which is selfclosing and can be positively operated by means of elements contained within the discharge pipe of the tank. This insures all accidental discharge of the tank in case the service valve should have been left open or damaged or the discharge pipe broken.

The precaution generally taken to prevent such accidental discharge is to furnish a hinged extension on the discharge pipe within the tank. By raising the free end of this extension to a position above or near the surface of the liquid contained in the tank, no discharge can then take place. But as such a device is not automatic but must be hand operated, the attendant supposed to raise the extension pipe after each fillin of a tank car or truck and also at the en of a working day, might forget to do so, which frequently happens, when loss of liq- I uid is apt to take place just the same.

Some advantages gained by the use of my safety check valve may here be mentioned, viz. Elimination of any opening in the top of the tank, thus making it gas tight. Less cost in construction and maintenance. Simplicity of operation as only one man is needed and the easily operable and accessible closing device for my check valve as compared with the cumbersome arrangement for raising the swing pipe in ordinary In the accompanying drawing one embodiment of my invention is illustrated, and

Figure 1 is a top plan view of the valve;

Figure 2 a vertical section along line 2-2 of Figure 2;

Figure 3 a rear view of the valve members; and,

Figure l an elevation and partial section of the valve and tank in smaller scale.

In the drawing reference numeral represents a storage tank such as commonly used for storing gasoline and other. oils. Such tanks may vary in size of from ten (10) to one hundred (100) feet indiameter and from twenty (20) to forty 40) feet in height. Near its bottom is to found an outlet opening (11) around which are bolted orriveted flanges (12) into which is threaded the discharge pipe (13) provlded with a service valve (14) of any suitable construction. Reference numeral (15) represents a T with a stufiing box (16) for the valve operating rod- (17), which has threaded enga ement (18) with the box for the purpose 0 advancing or retracting the rod axially in the discharge pipe (13) by means of a hand wheel (19).

To the nipple (20) projecting inwardly in the tank in alinement with the discharge pipe (13) is secured. by threads a valve housing (21) for my improved check valve which consists of a main valve member (22) and an auxiliary valve member (23). The main valve member is hinged on a spindle (24) located at the upper inner edge of the housing (21) so that it can swing upwards in opening. A ground joint seat (25) at the slanting mouth of the housing is provided for the main valve member (22).

The auxiliary valve member (23) has an upwardly directed arm (26) by means of which it is also hinged on the spindle (24;) carried by the housing. A seat (27) is furnished for the auxiliary valve member (23) in the front face of the main valve member (22) and a preferably oblong outlet opening (28) runs centrally through the latter and engages, a tit or abutment pin (29) projecting beyond the rear face of the main valve member. It should be noted that both valve members are apt to close by gravity in their respective seats which are set in inclined directions .to the vertical plane. A hook (30) or other suitable stop is provided on the front side of the main valve member to limit the movement of the auxiliary valve member with regard to the main valve member. This stop does, however, not prevent the full swing of the two valve members together.

Near the rear bottom edge of the main valve member (22) is furnished another abutment or tail piece (31) adapted to contact with the free end or head (32) of the operating rod (17) after it has pushed the first abutment (29) out of the way. The end of the operating rod (17) is su ported on a ferrule or roller (33) carrie by a cross bar (34) fixed in the sides of the housing (21).

In addition to the operating mechanism for my check valve just described, I' may also furnish an emergency lift. The latter comprises an eye (40) on the front side of the auxiliary valve member (23) in which engages a rin or book of a liftin chain or cable (41). he other end of this chain 1s attached to a lever (42) mounted on the inner end of a shaft (48) carried in a stuffing box (44) in the side wall of the tank (110) preferably immediately above the c eck valve. By means of an operating arm (45) fixed on the shaft (43), the latter ma be turned to open the check valve throu the intermediary of the lever (42), chain (41), eye (40), and hook'(30). It will thus be understood that the auxiliary valve member will be first opened until it strikes the hook (30) in this manner permitting some of the liquid to pass through the opening (28) into the discharge pipe and in this manner partly releasing the pressure on the main valve (22), which will now be raised by continuous pull on the chain and the engagement between the auxiliary valve (23;) and the stop or hook (30). This dev1ce 1s only used as an emergency in case the principal opening device should in some manner have become damaged.

- Ordinarily discharge is made from the tank by first turning the handwheel (19), thereby advancing the operating rod (17 through the action of the threads (18). The red head (32), which is fairly large and preferably pear shaped, then contacts with the abutment (29) pushing it inwards until its end is flush with the rear surface of the main valve member, thereby lifting the auxiliary valve member (23) OH its seat (27), permitting liquid to flow through the opening (28) and releasing the pressure on the main valve member. B continued advancement of the rod (17), its head (32) gradually passes 0d the abutment (29) and onto abutment (31) and then raises the main valve member (22) into its fully 0 en osition as indicated by the dot and ash ines in Figure 2. The service valve is now ready to be opened to makethe discharge from the tank.

As soon as the tank has been sulficiently drained the check valve is closed by retracting the operating rod through the reversed turning of the handwheel (19) whereupon the service valve (14) is also closed.

While the preferred embodiment of my invention has been described in detail, it will be understood that I do not wish to be limited to the particular construction set forth, since various changes in the form and arrangement of parts and in the details of construction may be resorted to without departing from the spirit and scope of the invention or destroying any of the advantages contained in the same.

I claim:

1. In combination with a discharge pipe, a check valve therefor comprising main and auxiliary valve members having coaxially hinged connection with said pi e, a stop on the main valve member adapte to limit the movement of the auxiliary valve member with relation thereto, a seat being provided on said pipe for the main valve member and a seat for the auxiliary valve member provided in the main valve member, and common means for opening the valve members;

said means being housed in said, pipe and adapted to open by contact the auxiliary valve member in advance of the main valve member.

\ 2. In combination with a discharge pipe, a check valve therefor comprising main and auxiliary valve members having hinged connection with said pipe and common means for opening the valve members; said means being) adapted to open the auxiliary valve mem er in advance of the main valve member, seats being provided on said pipe and said main valve member respectively for the main and auxiliary valve members, "said means com rising an operating rod mounted within said pipe, a device for reciprocating the rod in substantially axial direction in the pipe, and abutments on the valve members adapted to contact with said rod.

3. The combination with a storage tank having a discharge pipe, of a check valve therefor; said valve comprising a valve housing within the tank on said pipe, a main valve member and an auxiliary valve member each having) hinged connection with said housing, seats eing provided in said housing and the main valve member respectively for said valve members, a, substantially axially reciprocable operating rod for the valve within the ipe a bearing for the rod mounted exterior y o the tank on said pipe and means for reciprocat the rod therein, abutments on the main an auxiliary valve members, said rod being adapted to contact first with the abutment on the auxiliary valve member and subsequently with said other abutment during its advance to open said valve members.

4. In combination with a discharge pipe, 9. check valve therefor comprising main and auxiliary valve members having common hinged connection with said pipe and common means for opening the valve members; said means being housed in said pipe and adapted to make contact with the auxiliary valve member in advance of with the main valve member in order to 0 en said members and emergency means con ected with said auxiliary valve member for opening the valve members independent of said common opening means, the auxiliary valve member having limited motion with regard to the main valve member.

5. In combination with a discharge pipe, a check valve therefor comprisin main and auxiliary valve members having inged connection with said pipe and common means for opening the va ve members; said means being housed in said pipe, and adapted to open the auxiliary valve member in advance of the main valve member and emergency means for opening the valve member independent of said common opening means, said emergency means including a lever fulcrumed above said pipe and flexible connection between the lever and the auxiliary valve member, said auxiliar valve member being adapted to have a imited movement on the main valve member.

6. The combination with a stora e tank having a discharge pipe, of a chec valve therefor; said valve comprising a valve housing within the tank on said pipe, a main valve member and an auxiliary valve mem- =ber each having) hinged connection with said housing, seats eing provided in said housing and the main member respectively for said valve members, a substantiall axially reciprocable operating rod for t e valve within the pipe, a bearin for the rod mountedexteriorly of the tan lr on said pi e and means for reciprocating the rod t erein, abutments on the main and auxiliary valve members, said rod being adapted to contact first with the abutment on the auxiliary valve member and subsequently with said other abutment during its advance to open said valves; and emergency means independent of said common opening means for having a discharge pipe, of a chec valve therefor; said valve comprising a valve housing within the tank on said pipe, a main valve member and an auxiliary valve mem= ber each havin hinged connection with said housing, seats being provided in said housing and the main valve member res ectivel for said valve members, a substantia 1y axia ly reciprocable operating rod for the valve within the pipe, stufling box in said pi e for the rod havin threads engaging t 0 rod, a turning han le exteriorly of the tank carried by the rod, abutments on each of said valve members, said rod .being adapted to contact during its advancement first with the abutment of the auxiliary valve member and subsequently with the abutment of the ineain valve member to open said valve mem- In witness whereof, I have hereunto set my-hand at Charlotte, North Carolina, this 31 day of May, A. D. nineteen hundred and twenty-seven.

FRED W. BONITZ.