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US 8,899,258 B2Granted
Drain valve and method for operating a drain valve
AssigneeGraham-White Manufacturing Company
InventorWilliam F. Ginder
Life of this patent
Estimating the term…
Abstract
A drain valve includes an inlet plenum, a first orifice downstream from the inlet plenum, a second orifice downstream from the first orifice, and a fluid passage between the first and second orifices. A piston having a first position and a second position has a first surface area exposed to the fluid passage when the piston is in the first and second positions and a second surface area exposed to the inlet plenum when the piston is in the second position.
Claims16
A drain valve comprising:
- a. an inlet plenum;
- b. a first office downstream from the inlet plenum;
- c. a second orifice downstream from the first orifice;
- d. a fluid passage between the first and second orifices;
- e. a piston having a first position and a second position, wherein the piston has a first surface area exposed to the fluid passage when the piston is in the first and second positions and a second surface area exposed to the inlet plenum when the piston is in the second position and isolated from the inlet plenum when the piston is in the first position.
2 more elements
A drain valve comprising:
- a. an inlet plenum;
- b. a fluid passage downstream from the inlet plenum, wherein the fluid passage includes an inlet port and an outlet port;
- c. a piston engaged with a poppet in the fluid passage, wherein the piston has a first position that allows fluid flow through the fluid passage;
- d. a first surface area on the piston exposed to the fluid passage when the piston is in the first and second position;
- e. a second surface area on the piston exposed to the inlet plenum when the piston is in the second position and isolated from the inlet plenum when the piston is in the first position.
2 more elements
A method for operating a drain valve, comprising:
- a. applying a system pressure to an inlet plenum;
- b. creating a fluid pressure in a fluid passage downstream from the inlet plenum, wherein the fluid passage is between a first orifice and a second orifice;
- c. applying the fluid pressure to a first surface area of a piston connected to a poppet to produce a first force across the first surface area of the piston;
- d. moving the piston from a first position that prevents fluid flow through the passage to a second position that allows fluid flow through the fluid passage;
- e. applying the system pressure to a second surface area of the piston when the piston is in the second position to produce a second force across the second surface area of the piston;
- and
- f. moving the piston from the second position to the first position when the first force across the first surface area of the piston exceeds the second force across the second surface area of the piston.
4 more elements
Dependencies are inferred from the claim text.