초록 ▼

A gas vent orifice (78, 148) is located within a gas vent passageway. A closure ball (80, 154) is located upstream of the orifice (78, 148). A piston (66, 166) is located downstream of the orifice (78, 148). The piston (66, 166) includes a projection (76, 170) which projects into the orifice (78, 14

A gas vent orifice (78, 148) is located within a gas vent passageway. A closure ball (80, 154) is located upstream of the orifice (78, 148). A piston (66, 166) is located downstream of the orifice (78, 148). The piston (66, 166) includes a projection (76, 170) which projects into the orifice (78, 148), for dislodging the closure ball (80, 154) from its seated position. A mass in the form of a spherical ball (74, 160) functions to move the piston (66, 166) to dislodge the closure ball (80, 154). The mass (80, 154) rests on a conical ramp (56, 126) and the slope of the ramp serves to direct the mass (80, 154) against the piston (66, 166). A steep sloped ramp (126) may be used in combination with a piston (166) having a cylindrical center portion (168). Or, a shallow ramp (56) may be used in combination with a piston (66) having a flat upper surface and radial legs (68, 70) which fit within radial slots (58) in the ramp (56).

대표청구항 ▼

A vent valve adapted to permit gas flow but close in response to liquid flow, comprising: a passageway having a normally lower inlet and a normally upper outlet; wall means in said passageway between said inlet and said outlet, defining an orifice; a closure ball in said passageway below said orific

A vent valve adapted to permit gas flow but close in response to liquid flow, comprising: a passageway having a normally lower inlet and a normally upper outlet; wall means in said passageway between said inlet and said outlet, defining an orifice; a closure ball in said passageway below said orifice, said closure ball having a larger diameter than said orifice; a conical support spaced upwardly from said orifice, said conical support including a central opening and surface means surrounding the opening and sloping upwardly and outwardly from the central opening; a ball-shaped mass supported on said conical support, said mass being larger in diameter than said central opening; a piston member between said mass and said orifice, said piston member having an upper portion positioned in the central opening and a lower portion positioned to project into said orifice, said piston being movable between a lower position in which said lower portion projects through the orifice into contact with said closure ball, to prevent the closure ball from seating in said orifice, and an upper position in which said lower portion is spaced upwardly from said orifice, in a position to not interfere with the closure ball seating; and wherein said conical support, said piston and said mass are so dimensioned that when the mass is centered on said conical support, said mass is in contact with the upper portion of the piston and biases the piston downwardly into said lower position.