Female and male couplers of pipe coupling

A female coupler for connection to a male coupler to form a pipe coupling, said female coupler comprising:

• a cylindrical female coupler body having a front end opening, a rear end opening, and a through-hole extending between said front end opening and said rear end opening, said female coupler body being adapted to receive said male coupler from said front end opening for connection of said male coupler thereto;
• a pipe connection adapter having a cylindrical connecting portion that is inserted into said female coupler body from said rear end opening and is thus connected to said female coupler body;
• and
• a valve element set in said through-hole of said female coupler body at a position forward of said cylindrical connecting portion to enable said through-hole to be opened or closed;
• said pipe connection adapter having:
• a support leg extending from a front end surface of said cylindrical connecting portion axially forward of said cylindrical connecting portion;
• and
• a valve support ring secured to a front end of said support leg;
• said valve support ring having:
• a front end surface facing a valve head of said valve element set at a position axially forward of said valve support ring;
• a rear end surface facing axially rearward of said valve support ring;
• an outer circumferential surface having a diameter smaller than an outer diameter of said cylindrical connecting portion and defining a fluid passage between said circumferential surface and a wall surface of said through-hole of said female coupler body;
• and
• an inner circumferential surface slidably receiving a valve guide rod extending from said valve head axially rearward of said female coupler body;
• wherein said support leg is connected to said valve support ring at said rear end surface.