Pressure relief valves
AssigneeFisher Controls International LLC
InventorsChun Lin, Roy Ronald Pelfrey
Life of this patent
Estimating the term…
Abstract
Pressure relief valves are described herein. An example pressure relief valve includes a body having external threads to threadably engage another body having a pressurized chamber. Additionally, the pressure relief valve includes a relief valve orifice that is threadably engaged with the body via internal threads of the body. The relief valve orifice includes a seating surface. Further, the pressure relief valve includes a pressure-balanced piston assembly that is slidably movable within the body relative to the relief valve orifice and the seating surface to control the flow of fluid between the pressurized chamber and the relief valve orifice.
Claims23
A pressure relief valve, comprising:
- a body defining a flow path to be fluidly coupled to the atmosphere, the body having external threads to threadably engage another body having a pressurized chamber;
- a relief valve orifice that is threadably engaged with the body via internal threads of the body, wherein the relief valve orifice includes a seating surface;
- a spring load adjuster partially defining a pressure-balanced chamber, the spring load adjuster movable relative to the body to adjust a set point of the pressure relief valve;
- and
- a pressure-balanced piston assembly partially defining the pressure-balanced chamber, the pressure-balanced piston assembly movable relative to the spring load adjuster and the seating surface to control the flow of fluid between the pressurized chamber and the atmosphere, the flow path and the pressure-balanced piston assembly being disposed along a longitudinal axis of the pressure relief valve.
A pressure relief valve, comprising:
- a body including means for removably engaging another body having a pressurized chamber, the body defining a flow path therethrough;
- a relief valve orifice including a seating surface and means for removably engaging the body;
- and
- a pressure-balanced piston assembly disposed substantially within the flow path and including means for controlling a flow of fluid between the pressurized chamber and the relief valve orifice, wherein a set point of the pressure relief valve is based on a surface area difference between first and second opposing surfaces of the pressure-balanced piston assembly and a biasing element that is to urge the pressure-balanced piston assembly toward the seating surface, the first surface to at least partially define a pressure-balanced chamber.
A pressure relief valve, comprising:
- a body defining a flow path to be fluidly coupled to the atmosphere, the body comprising external threads to threadably engage another body having a pressurized chamber and a relief valve orifice comprising a seating surface, wherein the body at least partially defines a pressure-balanced chamber;
- a pressure-balanced piston assembly that at least partially defines the pressure-balanced chamber, the pressure-balanced piston assembly movable within the body relative to the seating surface to control the flow of fluid between the pressurized chamber and the atmosphere, wherein, the pressure-balanced piston assembly is to disengage the seating surface when a pressure of the pressure-balanced chamber is substantially equal to a pressure of the pressurized chamber.
Dependencies are inferred from the claim text.