Multi-adjustable valve for a lubrication system

A lubrication system for providing a fluid to one or more component cavities associated with an aircraft propulsion system, comprising:

• a tank configured to hold a volume of the fluid;
• a pressure pump configured to pump the fluid to the one or more component cavities;
• and
• a multi-adjustable valve configured to control a pressure differential of a flow of the fluid across at least one of the component cavities, the multi-adjustable valve including:
• a longitudinal axis;
• a biasing member;
• a housing having an interior cavity, a fluid inlet port, and a fluid outlet port, the interior cavity extending from a first end of the housing to a second end of the housing;
• a first adjustable piston configured for threaded engagement with the housing interior cavity adjacent to the first end of the housing, the first adjustable piston axially moveable within the housing interior cavity via the threaded engagement with the housing interior cavity;
• a second adjustable piston having a shaft and a head disposed at a distal end of the shaft, the shaft configured for threaded engagement with the first adjustable piston, the second adjustable piston axially moveable via the threaded engagement between the shaft and the first adjustable piston;
• and
• a spool having a spool shaft connected to and extending between a spring housing (SH) and an end cap, the end cap disposed adjacent to the second end of the housing, and the spring housing having an SH interior cavity configured to receive the biasing member, wherein the spool is configured for axial movement within the housing interior cavity;
• wherein the second adjustable piston head is disposed in the spring housing and the biasing member is disposed between the second adjustable piston head and a base surface of the spring housing, wherein in a compressed state the biasing member produces a biasing force that biases the spool toward the second end of the housing;
• wherein the valve is configured to receive the fluid at a first pressure between the spring housing and the first end of the housing, and to receive the fluid at a second pressure between the spool end cap and the second end of the housing, and during use the multi-adjustable valve is configured to meter the flow of the fluid through the housing fluid inlet port and the housing fluid outlet port by the spool spring housing entirely blocking the housing fluid outlet port, or partially blocking the housing fluid outlet port, or not blocking the housing fluid outlet port as a function of a difference between the first pressure and the second pressure and the biasing force.

A multi-adjustable valve for a flow of fluid within a lubrication system, the valve having a longitudinal axis, the valve comprising:

• a biasing member;
• a housing having an interior cavity, an inlet fluid port, and an outlet fluid port;
• a first adjustable piston;
• a second adjustable piston;
• and
• a spool;
• wherein the first adjustable piston is disposed in the housing interior cavity and is positionally adjustable within the housing interior cavity and is configured to produce a pressure adjusting effect on the flow of fluid;
• and
• wherein the biasing member is axially disposed between the second adjustable piston and the spool;
• and
• wherein the second adjustable piston is disposed within the housing interior cavity and is attached to the first adjustable piston and is positionally adjustable relative to the first adjustable piston, wherein the second adjustable piston, the biasing member, and the spool are configured to produce a pressure regulating effect on the flow of fluid.