Toe valve

A downhole tool, comprising:

• a body defining a bore axially therethrough and a port in communication with the bore and extending radially through the body;
• an inner cap positioned in the port, the inner cap sealing the port;
• a first shearable retainer retaining the inner cap;
• an outer cap positioned in the port;
• and
• a second shearable retainer retaining the outer cap,
• wherein the outer cap is spaced apart from the inner cap, and wherein the outer cap seals the port, such that a chamber is defined between the inner and outer caps in the port,
• wherein the inner cap is configured such that the inner cap moves toward the outer cap in response to a first pressure differential between bore and the chamber across the outer cap, and
• wherein the inner cap is configured such that the inner cap dislodges the outer cap from the port in response to the inner cap engaging the outer cap and a second pressure differential between the bore and an exterior of the downhole tool.

A valve assembly for a downhole tool, comprising:

• an outer cap received into a port extending radially through the downhole tool;
• an inner cap received into the port and spaced apart from the outer cap such that a chamber is defined between and at least partially by the inner and outer caps in the port;
• an inner retainer that holds the inner cap in the port, wherein the inner retainer is configured such that the inner retainer yields in response to a predetermined pressure to the inner cap, such that the inner cap moves toward and collides with the outer cap;
• and
• an outer retainer that holds the outer cap in the port, wherein the outer retainer is configured such that the outer retainer yields at least partially in response to the inner cap colliding with the outer cap, such that the inner and outer caps are ejected from the port in response to the application of the predetermined pressure.