Tubular plastic hydrant

摘要

In a hydrant assembly, the combination comprising an outer tubular member having a first flow port; an inner tubular member having a closure thereon to close the port in relative axially advanced position of the closure, and to open the port in relative axially retracted position of the closure that allows fluid flow through the port to an outlet, control means to control relative movement of the inner and outer members. The closure means may include a bullet, an O-ring or the like carried by said bullet, the bullet telescopically carried by said inner member. A bore carried by the outer tubular member is in sliding sealing relationship to said O-ring. Once hydrant is closed (off position) the bullet will continue to advance into the bore as pressure in the outer tubular member increases when residual water freezes. Because of advancement of the bullet, pressure in the outer tubular member will never exceed supply line pressure thus preventing damage to the outer tubular member. A second port may be located sidewardly of the outer tubular member to pass fluid in relatively advanced position of the closure to relieve fluid pressure in space formed between the inner and outer members, the inner member being elongated and extending lengthwise in the outer tubular member. Since the pressure in the outer tubular member never exceeds the supply pressure, the outer tubular member can be made of plastic to reduce costs.

主权项

1. In a hydrant assembly, the combination comprising
a) an outer tubular member having a first flow port, b) an inner tubular member having closure means thereon to close said port in relatively axially advanced position of said closure means, and to open said port in relatively axially retracted position of said closure means that allows fluid flow through said port to an outlet from said outer tubular member, c) control means to control relative movement of the inner and outer members, d) said closure means comprising an annular first seal extending about an axis defined by said closure member, there being an axially elongated bore carried by said outer member, and into which said first seal has sliding sealing fit as the closure means is advanced beyond advanced position of said inner tubular member, and wherein the closure means remains slidable in said primary bore in spacially advanced positions of the first seal relative to said primary bore, and e) there being a stem projecting from said closure means for slidable reception into the forward end of said inner tubular member.