Low refrigerant loss distribution manifold for liquid cooling of server rack

A rack cooling circuit for cooling at least one server, the rack cooling circuit comprising:

• a supply manifold;
• a supply conduit fluidly connecting the supply manifold to the at least one server;
• a return manifold;
• a return conduit fluidly connecting the return manifold to the at least one server;
• a supply valve operable to control a flow of working fluid from the supply manifold to the at least one server via the supply conduit;
• a return valve operable to control the flow of working fluid from the supply manifold to the at least one server via the supply conduit;
• and
• a valve fluidly connected to the rack cooling circuit downstream from the supply valve and upstream from the return valve, the valve being operable to drain cooling medium from the rack cooling circuit.

A method of isolating a server from a rack cooling circuit, the method comprising:

• closing a supply valve arranged upstream from the server to stop a supply of working fluid to the server;
• closing a return valve arranged downstream from the server to stop a flow of working fluid from the server;
• operating a valve to drain a working fluid from a portion of the rack cooling circuit downstream from the supply valve and upstream from the return valve;
• and
• operating at least one quick connector to separate the server from the rack cooling circuit.