Cast iron flap valves - Pressure relief valve calibration - John deere hydraulic valve.
Cast Iron Flap Valves
(Flap valve) A hinged flap within a plumbing system that restricts water flow to one direction, preventing backflow.
(Flap Valve) Same as "Check Valve." -- A valve arranged to permit a flow in one direction only, thereby preventing the return of the fluid.
A valve opened and closed by a plate hinged at one side
A hard, relatively brittle alloy of iron and carbon that can be readily cast in a mold and contains a higher proportion of carbon than steel (typically 2.0–4.3 percent)
Firm and unchangeable
Cast iron usually refers to grey iron, but also identifies a large group of ferrous alloys, which solidify with a eutectic. The colour of a fractured surface can be used to identify an alloy.
an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting
extremely robust; "an iron constitution"
twigs on blue field
Location: Well Walk, London NW3
Materials: Cast Steel, Concrete, Blue Paint, Twigs, Seeds, Rainwater
Finder's Comments: This blue paint is used when the utilities contractors are marking out items to be fixed/changed/refurbished.
Submitted by: halfbeak