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 relatively axially advanced position of the closure, and to open the port in relatively 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. A second port may be located sidewardly of the outer tubular member to pass fluid in relatively retracted 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. The outer tubular member may consist of plastic material. Travel of the closure acts to allow expansion of fluid as it freezes, to relieve pressure build-up within the assembly.

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, and d) said closure means comprising an annular first seal extending about an axis defined by said closure means, there being an axially elongated primary bore carried by said outer member, and into which said first seal has sliding sealing fit as the closure means is advanced, and wherein the closure means remains slidable in said primary bore in spacially advanced positions of the first seal relative to said primary bore, e) there being a stem projecting from said closure means for slidable reception into the forward end of said inner tubular member, f) there being an annular cup seal carried by the closure means to have peripheral sliding engagement with a secondary bore defined by the outer tubular member as the stem slides in said inner tubular member and as the first seal slides in said primary bore, which is stepped inwardly relative to the secondary bore, there being an elongated body between said first seal and said cup seal.