TH3156U - A device to prevent overfilling of gas. - Google Patents

Abstract

An overfill prevention device consists of a housing containing a piston. The upper part of the housing, below the threaded end, has several holes around its circumference for gas flow into and out of the gas tank. The top of the housing has a pressure relief hole. A spring is fitted into the space between the upper part of the piston and the inside of the lower part of the housing. The central shaft of the piston has a channel, also fitted with a spring in the lower part of this channel. The bottom end of the housing, which is internally threaded, is attached to the first section of the float body. The lower part of the first section of the float body has two legs that fit onto the upper part of the second section of the float body with a locking pin. The second section of the float body is molded with a central claw that moves to push against the lower end of the push rod of the push plate. The side claws of the central claw move up to push against the sides of the first section of the float body. The lower part of the second section of the float body is the float rod.

Claims (5)

1. The overfill protection device consists of a housing (1) which is shaped like a hollow cylinder, the top end of which is an external thread for fitting onto the internal threaded surface of the lower body of the LPG valve, and the bottom end of the housing (1) is an internal thread for fitting onto the first body of the float (2). On the upper body (3) of the housing (1), below the threaded top end, there are several holes (6) around the circumference to serve as channels for gas to flow in and out of the gas tank, and on the top of the lower body (4) of the housing (1) is a pressure relief hole (13). A piston (5) is installed inside the housing (1), the top of the piston (5) is approximately the same size as the upper body (3) of the housing (1) so that it fits properly into the upper body (3) of the housing (1). And at the center of the piston (5) there is a channel (10) to allow gas to flow in, in which the space between the top of the piston (5) and the inside of the lower body (4) of the housing (1) is fitted with a spring (7), in which the connection point between the channel (10) of the middle and the lower part of the channel (10) is a shoulder (11) to support the spring (12). It has a specific characteristic: at the very bottom end of the housing (1), which is internally threaded, it is threaded into the first body of the float (2), in which the center of the first body of the float (2) is hollow, in which the top of the first body of the float (2) is fitted with a push plate (15), in which at the bottom of the push plate (15) is a cylindrical push rod (17) that extends its lower end out of the first body. One of the floats (2) is formed by two legs (18) at the bottom of the first body of the float (2) to be fitted into the top of the second body of the float (19) with a locking pin (24). The second body of the float (19) is formed into a central claw (20) which moves to push against the lower end of the push rod (17) of the push plate (15), and on either side of the central claw (20) are side claws (21) that move up to push against the two side edges of the first body of the float (2). The lower part of the second body of the float (19) is the float rod (22), and the lower part of the second body of the float (19) is the float (23) which is attached to the float rod (22) by a tightening method (24). 2. A device to prevent overfilling of gas in accordance with claim 1, in which the upper body (3) of housing (1) shall be smaller than the lower body (4) of housing (1). 3. A device to prevent overfilling of gas in the amount specified in claim 1 or 2, in which an O-ring (8) is fitted at the upper end of the piston (5) to prevent gas leakage, and an O-ring (9) is fitted at the lower end of the piston (5) to prevent gas leakage as well. 4. A device to prevent overfilling of gas in any of the claims 1 to 3, in which the size of the (10) channel of the upper part of the piston (5) is smallest and gets larger in the middle of the piston (5), and the size of the (10) channel is largest in the lower part of the piston (5). 5. An overfilling device for gas, according to any one of claims 1 to 4, which has an O-ring (14) fitted between the housing (1) and the first body of the float (2) to prevent gas leakage.