Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1994-12-14
1995-11-14
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137517, 137536, F16K 1734
Patent
active
054657512
ABSTRACT:
An excess flow control valve for telescopical receipt in a cylindrical fluid distribution pipe to control downstream flow therein. The excess flow valve includes a cylindrical pressure reducer fitting for mounting the valve in the pipe and is formed with an upstream facing annular valve seat and a downstream diverging venturi nozzle therethrough. A poppet valve barrel having a central chamber is mounted to the pressure reducer fitting, the chamber formed with a plurality of peripheral inlet flow passages disposed upstream of the fitting and further including at the upstream end thereof, a gland. A poppet having an cylindrical base and an upstream projecting stem is slidably received in the chamber and the stem is received in the gland. The stem includes a stop ring at the upstream end thereof and a compression spring is disposed over the stem in an interposed relationship between the valve barrel and the stop ring to bias the poppet away from the valve seat. As fluid flow increases through the inlet flow passages and out through the venturi nozzle, a pronounced pressure drop is established across the venturi nozzle causing the poppet to be drawn toward and engage the valve seat to close the valve and prevent fluid passage therethrough.
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Nilson Robert G.
R.W. Lyall & Company, Inc.
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