Low spill quick disconnect coupling

A female coupling member, comprising:

• a body having an axially-extending internal cavity with a rear cavity portion, and forward cavity portion having a forward open end;
• a cylindrical piston sleeve slideably received within the forward cavity portion of the body,
• a spring urging the sleeve toward the forward end of the body;
• a radially-inward projecting annular valve seat of the body separating the rear cavity portion from the forward cavity portion;
• a valve stem assembly slideably received within the internal cavity, the valve stem assembly including i) a valve stem portion, the valve stem portion including an enlarged valve head toward the forward end of the female body with a forwardly-opening cavity and an outer surface sealingly engaged with the piston sleeve, said piston sleeve urged by the spring forwardly into sealing engagement with the valve head;
• and ii) a poppet valve connected to the valve stem portion and disposed within the rear cavity portion of the internal cavity, said poppet valve dimensioned to be sealingly seated and urged forwardly against the valve seat by the spring when the piston sleeve is in sealing engagement with the valve head to prevent fluid flow through the female coupling member;
• the piston sleeve and valve stem assembly being axially-displaceable rearward in the body such that the poppet valve moves rearwardly away from the valve seat and the piston sleeve moves away from the valve head of the valve stem portion to allow fluid to flow through the female coupling member.

A low-spill, quick-disconnect coupling, comprising:

• i) a male coupling member having a body with an internal cavity and a spring-biased valve slidable within the internal cavity with a conical valve head projecting forwardly of a forward end of the male body;
• and
• ii) a female coupling member having an axially-extending internal cavity with upstream cavity portion, and a downstream cavity portion having a forward open end receiving the male coupling member;
• a cylindrical piston sleeve slideably received within the downstream cavity portion of the body, the piston sleeve having an annular surface facing the forward end of the female body and in flush engagement with the forward end of the male body;
• a spring urging the sleeve toward the forward end of the female body;
• a radially-inward projecting annular valve seat of the female body separating the upstream cavity portion from the downstream cavity portion;
• a valve stem assembly slideably received within the internal cavity, the valve stem assembly including i) a valve stem portion, the valve stem portion including an enlarged valve head toward the forward end of the female body with a forwardly-opening conical cavity receiving the conical valve head of the male coupling, and an outer surface sealingly engageable with the piston sleeve when the female coupling member is uncoupled from the male coupling member;
• and ii) a poppet valve extending forwardly from the valve stem portion and disposed within the upstream cavity portion of the internal cavity, said poppet valve dimensioned to be sealingly seated and urged forwardly against the valve seat by the spring through the engagement of the valve head and the piston sleeve when the female coupling member is uncoupled from the male coupling member to prevent fluid flow through the female coupling member and to contain upstream system fluid;
• the piston sleeve and valve stem assembly being axially-displaced rearward in the body such that the poppet valve is moved rearwardly away from the valve seat and the piston sleeve is moved rearwardly away from the valve head of the valve stem portion to allow fluid to flow through the female coupling member.