| 摘要 |
<p>A hydrant comprising; a hollow body (1) enclosing a valve, the hollow body terminating at one end in an inlet flange (2) configured for connection to a riser pipe, and at an opposing end in an outlet (3) positioned axially directly above the inlet providing an unobstructed first bore from inlet to outlet when the valve is opened, a second bore connecting with the first bore receiving a shaft (6) which carries an operating means for operating opening and closure of the valve through axial or rotational movement of the shaft, the valve mechanism comprising a plug (10) configured to sit onto a seat (11) provided around the body wall defining the first bore, a fixed hinged linkage (7,9 ) linking the plug with the shaft configured such that on axial movement of the shaft or mount carried thereon, the plug is caused to be moved between a position where it is fully engaged with the seat and a position where the bore is unobstructed.</p> |
